GasLog Ltd. (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 00090 - Document - Document and Entity Information Network

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2 Implied Table Table

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3 Document and Entity Information Abstract glog:DocumentAndEntityInformationAbstract
4 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
5 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
6 Document Type Concept (Submission Type) For Period dei:DocumentType
7 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
8 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
9 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
10 Entity Well-known Seasoned Issuer Concept (Yes/No) For Period dei:EntityWellKnownSeasonedIssuer
11 Entity Voluntary Filers Concept (Yes/No) For Period dei:EntityVoluntaryFilers
12 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
13 Entity Filer Category Concept (Filer Category) For Period dei:EntityFilerCategory
14 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
15 Number of common shares outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
16 Number of preference shares outstanding Concept (Shares) As Of glog:EntityPreferenceStockSharesOutstanding
17 Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
18 Entity Shell Company Concept (Yes/No) For Period dei:EntityShellCompany
19 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
20 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
21 00100 - Statement - Consolidated statements of financial position Network

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22 Implied Table Table

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23 Consolidated statements of financial position Abstract ifrs-full:StatementOfFinancialPositionAbstract
24 Assets Abstract ifrs-full:AssetsAbstract
25 Non-current assets Abstract ifrs-full:NoncurrentAssetsAbstract
26 Goodwill Concept (Monetary) As Of Debit ifrs-full:Goodwill
27 Investment in associates Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociatesAccountedForUsingEquityMethod
28 Deferred financing costs Concept (Monetary) As Of Debit glog:DeferredFinanceCosts
29 Other non-current assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentNonfinancialAssets
30 Derivative financial instruments Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
31 Tangible fixed assets Concept (Monetary) As Of Debit glog:TangibleFixedAssets
32 Vessels under construction Concept (Monetary) As Of Debit ifrs-full:ConstructionInProgress
33 Vessel held under finance lease Concept (Monetary) As Of Debit ifrs-full:RecognisedFinanceLeaseAsAssets
34 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
35 Current assets Abstract ifrs-full:CurrentAssetsAbstract
36 Trade and other receivables Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
37 Dividends receivable and other amounts due from related parties Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivablesDueFromRelatedParties
38 Derivative financial instruments Concept (Monetary) As Of Debit ifrs-full:CurrentDerivativeFinancialAssets
39 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
40 Prepayments and other current assets Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaymentsAndOtherCurrentAssets
41 Short-term investments Concept (Monetary) As Of Debit ifrs-full:CurrentInvestments
42 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
43 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
44 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
45 Equity and liabilities Abstract ifrs-full:EquityAndLiabilitiesAbstract
46 Equity Abstract ifrs-full:EquityAbstract
47 Preference shares Concept (Monetary) As Of Credit glog:PreferenceShares
48 Share capital Concept (Monetary) As Of Credit glog:ShareCapital
49 Contributed surplus Concept (Monetary) As Of Credit ifrs-full:SharePremium
50 Reserves Concept (Monetary) As Of Credit ifrs-full:OtherReserves
51 Treasury shares Concept (Monetary) As Of Debit ifrs-full:TreasuryShares
52 (Accumulated deficit)/retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
53 Equity attributable to owners of the Group Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
54 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
55 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
56 Current liabilities Abstract ifrs-full:CurrentLiabilitiesAbstract
57 Trade accounts payable Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
58 Ship management creditors Concept (Monetary) As Of Credit glog:ShipManagementCreditors
59 Amounts due to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
60 Derivative financial instruments Concept (Monetary) As Of Credit ifrs-full:CurrentDerivativeFinancialLiabilities
61 Other payables and accruals Concept (Monetary) As Of Credit ifrs-full:CurrentAccruedExpensesAndOtherCurrentLiabilities
62 Borrowings, current portion Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
63 Finance lease liability, current portion Concept (Monetary) As Of Credit ifrs-full:CurrentFinanceLeaseLiabilities
64 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
65 Non-current liabilities Abstract ifrs-full:NoncurrentLiabilitiesAbstract
66 Derivative financial instruments Concept (Monetary) As Of Credit ifrs-full:NoncurrentDerivativeFinancialLiabilities
67 Borrowings, non-current portion Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
68 Finance lease liability, non-current portion Concept (Monetary) As Of Credit ifrs-full:NoncurrentFinanceLeaseLiabilities
69 Other non-current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentNonfinancialLiabilities
70 Total non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
71 Total equity and liabilities Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
72 00200 - Statement - Consolidated statements of profit or loss Network

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73 Implied Table Table

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74 Consolidated statements of profit or loss Abstract ifrs-full:IncomeStatementAbstract
75 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
76 Net pool allocation Concept (Monetary) For Period Credit glog:NetPoolAllocation
77 Voyage expenses and commissions Concept (Monetary) For Period Debit glog:VoyageExpensesAndCommissions
78 Vessel operating and supervision costs Concept (Monetary) For Period Debit glog:VesselOperatingAndSupervisionCosts
79 Depreciation Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
80 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
81 Profit from operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
82 Financial costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
83 Financial income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
84 (Loss)/gain on derivatives Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
85 Share of profit of associates Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
86 Total other expenses, net Concept (Monetary) For Period Debit glog:OtherExpensesNet
87 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
88 Attributable to: Abstract ifrs-full:ProfitLossAttributableToAbstract
89 Owners of the Group Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
90 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
91 (Loss)/earnings per share-basic and diluted Abstract ifrs-full:BasicAndDilutedEarningsPerShareAbstract
92 (Loss)/earnings per share - basic Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
93 (Loss)/earnings per share - diluted Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
94 00300 - Statement - Consolidated statements of comprehensive income or loss Network

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95 Implied Table Table

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96 Consolidated statements of comprehensive income or loss Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
97 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
98 Other comprehensive income/(loss): Abstract ifrs-full:OtherComprehensiveIncomeAbstract
99 Items that may not be reclassified subsequently to profit or loss: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract
100 Actuarial loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
101 Items that may be reclassified subsequently to profit or loss: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
102 Effective portion of changes in fair value of cash flow hedges, net of amounts recycled to profit or loss Concept (Monetary) For Period Credit glog:GainLossOnCashFlowHedgesNetOfTaxNetOfAmountsRecycledToProfitOrLossOnRealization
103 Recycled loss of cash flow hedges reclassified to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedFutureCashFlowsAreNoLongerExpectedToOccurNetOfTax
104 Other comprehensive income/(loss) for the year Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
105 Total comprehensive income/(loss) for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
106 Attributable to: Abstract ifrs-full:ComprehensiveIncomeAttributableToAbstract
107 Owners of the Group Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
108 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
109 00400 - Statement - Consolidated statements of changes in equity Network

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110 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
111 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
112 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
113 Common shares/units Member ifrs-full:OrdinarySharesMember
114 Preference shares/units Member ifrs-full:PreferenceSharesMember
115 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
116 Equity [member] Member ifrs-full:EquityMember
117 Issued capital Member ifrs-full:IssuedCapitalMember
118 Contributed surplus Member ifrs-full:SharePremiumMember
119 Reserves Member ifrs-full:OtherReservesMember
120 Treasury shares Member ifrs-full:TreasurySharesMember
121 Retained earnings/(accumulated deficit) Member ifrs-full:RetainedEarningsMember
122 Attributable to owners of the Group Member ifrs-full:EquityAttributableToOwnersOfParentMember
123 Non-controlling interests Member ifrs-full:NoncontrollingInterestsMember
124 Changes in equity LineItems ifrs-full:StatementOfChangesInEquityLineItems
125 Balance at beginning of year Concept (Monetary) As Of Credit ifrs-full:Equity
126 Opening adjustment Concept (Monetary) As Of Credit glog:AdjustmentsDueToAdoptionOfIfrs15AndIfrs9
127 Balance as of January 1, 2018 Concept (Monetary) As Of Credit glog:EquityAdjustedDueToAdoptionOfIfrs15AndIfrs9
128 Net proceeds from GasLog Partners' public offerings (Note 4) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInEquityOfSubsidiaries
129 Other equity related costs Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
130 Dividend paid (common and preference shares) (Note 4 and 12) Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
131 Share-based compensation, net of accrued dividend (Note 22) Concept (Monetary) For Period Credit glog:IncreaseDecreaseSharebasedCompensationNetOfAccruedDividend
132 Settlement of share-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
133 Treasury shares, net Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions
134 Profit/(loss) for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
135 Other comprehensive income/(loss) for the year Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
136 Total comprehensive income/(loss) for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
137 Balance at the end of the year Concept (Monetary) As Of Credit ifrs-full:Equity
138 00500 - Statement - Consolidated statements of cash flows Network

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139 Implied Table Table

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140 Consolidated statements of cash flows Abstract ifrs-full:StatementOfCashFlowsAbstract
141 Cash flows from operating activities: Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
142 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
143 Adjustments for: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
144 Depreciation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationExpense
145 Share of profit of associates Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod
146 Financial income Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForFinanceIncome
147 Financial costs Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFinanceCosts
148 Unrealized foreign exchange losses/(gains) on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
149 Unrealized (gain)/loss on derivative financial instruments held for trading, including ineffective portion of cash flow hedges (Note 26) Concept (Monetary) For Period Debit glog:AdjustmentsForUnrealisedInterestRateSwapsLossesGains
150 Recycled loss of cash flow hedges reclassified to profit or loss (Note 26) Concept (Monetary) For Period Debit glog:AdjustmentsForRecycledLossProfitOfCashFlowHedges
151 Non-cash defined benefit obligations Concept (Monetary) For Period Debit glog:AdjustmentsForNonCashDefinedBenefitObligations
152 Share-based compensation (Note 22) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
153 Adjusted profit Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital
154 Movements in operating assets and liabilities: Abstract glog:MovementsInOperatingAssetsAndLiabilities
155 Decrease/(increase) in trade and other receivables including related parties, net Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable
156 (Increase)/decrease in prepayments and other assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherAssets
157 (Increase)/decrease in inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
158 Decrease/(increase) in other non-current assets Concept (Monetary) For Period Debit glog:AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssets
159 (Decrease)/increase in other non-current liabilities Concept (Monetary) For Period Debit glog:AdjustmentsForIncreaseDecreaseInOtherNonCurrentLiabilities
160 (Increase)/decrease in restricted cash Concept (Monetary) For Period Debit glog:AdjustmentsForIncreaseDecreaseInRestrictedCash
161 Increase in accounts payable and other current liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
162 Cash provided by operations Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperations
163 Interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsOperatingActivities
164 Net cash provided by operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
165 Cash flows from investing activities: Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
166 Payments for tangible fixed assets, vessels under construction and vessel held under finance lease Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
167 Dividends received from associate Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedFromAssociatesClassifiedAsInvestingActivities
168 Return of contributed capital from associate (Note 5) Concept (Monetary) For Period Debit glog:ReturnOfContributedCapitalFromAssociate
169 Other investments Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInAssociates
170 Purchase of short-term investments Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
171 Maturity of short-term investments Concept (Monetary) For Period Debit glog:CashFlowFromMaturityOfShortTermInvestments
172 Financial income received Concept (Monetary) For Period Debit glog:FinanceIncomeReceivedClassifiedAsInvestingActivities
173 Net cash used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
174 Cash flows from financing activities: Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
175 Proceeds from bank loans and bonds Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
176 Proceeds from sale and finance leaseback Concept (Monetary) For Period Debit glog:ProceedsFromSaleAndFinanceLeaseback
177 Bank loans and bond repayments Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
178 Payment of loan and bond issuance costs Concept (Monetary) For Period Credit ifrs-full:PaymentsForDebtIssueCosts
179 Proceeds from GasLog Partners' common unit offerings (net of underwriting discounts and commissions) Concept (Monetary) For Period Debit glog:ProceedsFromIssuanceOfRelatedEntityCommonUnitOfferings
180 Proceeds from GasLog Partners' preference unit offerings (net of underwriting discounts and commissions) Concept (Monetary) For Period Debit glog:ProceedsFromIssuanceOfRelatedEntityPreferenceUnitOfferings
181 Payment of equity raising costs Concept (Monetary) For Period Credit ifrs-full:PaymentsForShareIssueCosts
182 Payment for cross currency swaps' termination/modification Concept (Monetary) For Period Credit glog:PaymentForCrossCurrencySwapsTerminationModification
183 Payment for NOK bonds repurchase at a premium Concept (Monetary) For Period Debit glog:PaymentForBondRepurchaseAtPremium
184 Payment for interest rate swaps' termination Concept (Monetary) For Period Debit glog:PaymentForInterestRateSwapsTermination
185 Proceeds from entering into interest rate swaps Concept (Monetary) For Period Debit glog:ProceedsFromEnteringIntoInterestRateSwaps
186 Purchase of treasury shares Concept (Monetary) For Period Credit ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
187 Proceeds from stock options' exercise Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
188 Dividends paid Concept (Monetary) For Period Credit ifrs-full:DividendsPaidClassifiedAsFinancingActivities
189 Decrease in restricted cash Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents
190 Payments for vessel held under finance lease Concept (Monetary) For Period Credit glog:PaymentsOfVesselHeldUnderFinanceLeaseLiabilitiesClassifiedAsFinancingActivities
191 Payments for finance lease liability Concept (Monetary) For Period Credit glog:PaymentsOfFinanceLeaseLiabilitiesExcludingInterestClassifiedAsFinancingActivities
192 Net cash provided by financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
193 Effects of exchange rate changes on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
194 (Decrease)/ increase in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
195 Cash and cash equivalents, beginning of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
196 Cash and cash equivalents, end of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
197 Non-cash investing and financing activities Abstract glog:IfrsNonCashInvestingAndFinancingItemsAbstract
198 Capital expenditures included in liabilities at the end of the year (Note 27) Concept (Monetary) For Period Credit glog:IfrsCapitalExpendituresIncurredButNotYetPaid
199 Equity raising costs included in liabilities at the end of the year (Note 27) Concept (Monetary) For Period Credit glog:IfrsEquityRaisingCostsIncludedInLiabilities
200 Loan issuance costs included in liabilities at the end of the year (Note 27) Concept (Monetary) For Period Credit glog:IfrsLoanIssuanceCostsIncludedInLiabilities
201 Receivables from stock options' exercise included in assets at the end of the year Concept (Monetary) For Period Debit glog:ReceivablesFromStockOptionsExerciseIncludedInAssets
202 10101 - Disclosure - Organization and Operations Network

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203 Implied Table Table

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204 Organization and Operations Abstract glog:OrganizationAndOperationsAbstract
205 Organization and Operations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory
206 10201 - Disclosure - Significant Accounting Policies Network

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207 Implied Table Table

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208 Significant Accounting Policies Abstract glog:AccountingPolicyAbstract
209 Significant Accounting Policies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
210 10301 - Disclosure - Goodwill Network

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211 Implied Table Table

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212 Goodwill. Abstract glog:GoodwillAbstract
213 Goodwill Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoodwillExplanatory
214 10401 - Disclosure - Equity Transactions Network

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215 Implied Table Table

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216 Equity Transactions Abstract glog:EquityTransactionsDisclosureAbstract
217 Equity Transactions Concept (Text Block (HTML)) For Period glog:EquityTransactionsDisclosureTextBlock
218 10501 - Disclosure - Investment in Associates and Joint Venture Network

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219 Implied Table Table

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220 Investment in Associates and Joint Venture Abstract glog:DisclosureOfInformationAboutConsolidatedFinancialStatementsAbstract
221 Investment in Associates and Joint Venture Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory
222 10601 - Disclosure - Tangible Fixed Assets, Vessels Under Construction and Vessel Held Under Finance Lease Network

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223 Implied Table Table

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224 Tangible Fixed Assets, Vessels Under Construction and Vessel Held Under Finance Lease Abstract ifrs-full:DisclosureOfPropertyPlantAndEquipmentAbstract
225 Tangible Fixed Assets, Vessels Under Construction and Vessel Held Under Finance Lease Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
226 10701 - Disclosure - Sale and Leaseback Network

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227 Implied Table Table

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228 Sale and Leaseback Abstract ifrs-full:DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeAbstract
229 Sale and Leaseback Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfLeasesExplanatory
230 10801 - Disclosure - Cash and Cash Equivalents Network

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231 Implied Table Table

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232 Cash and Cash Equivalents Abstract ifrs-full:CashAndCashEquivalentsAbstract
233 Cash and Cash Equivalents Concept (Text Block (HTML)) For Period glog:DisclosureOfCashAndCashEquivalentsTextBlock
234 10901 - Disclosure - Trade and Other Receivables Network

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235 Implied Table Table

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236 Trade and Other Receivables Abstract ifrs-full:TradeAndOtherCurrentReceivablesAbstract
237 Trade and Other Receivables Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
238 11001 - Disclosure - Other Non-Current Assets Network

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239 Implied Table Table

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240 Other Non-Current Assets Abstract ifrs-full:MiscellaneousNoncurrentAssetsAbstract
241 Other Non-Current Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherNoncurrentAssetsExplanatory
242 11101 - Disclosure - Share Capital Network

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243 Implied Table Table

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244 Share Capital Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
245 Share Capital Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIssuedCapitalExplanatory
246 11201 - Disclosure - Reserves Network

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247 Implied Table Table

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248 Reserves. Abstract glog:ReservesAbstract
249 Reserves Concept (Text Block (HTML)) For Period glog:DisclosureOfReservesTextBlock
250 11301 - Disclosure - Borrowings Network

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251 Implied Table Table

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252 Borrowings Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
253 Borrowings Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
254 11401 - Disclosure - Other Payables and Accruals Network

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255 Implied Table Table

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256 Other Payables and Accruals Abstract ifrs-full:MiscellaneousCurrentLiabilitiesAbstract
257 Other Payables and Accruals Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccruedExpensesAndOtherLiabilitiesExplanatory
258 11501 - Disclosure - Vessel Operating and Supervision Costs Network

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259 Implied Table Table

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260 Vessel Operating and Supervision Costs Abstract glog:VesselOperatingAndSupervisionCostsAbstract
261 Vessel Operating and Supervision Costs Concept (Text Block (HTML)) For Period glog:DisclosureOfVesselOperatingAndSupervisionCostsTextBlock
262 11601 - Disclosure - Voyage Expenses and Commissions Network

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263 Implied Table Table

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264 Voyage Expenses and Commissions Abstract glog:VoyageExpensesAndCommissionsAbstract
265 Voyage Expenses and Commissions Concept (Text Block (HTML)) For Period glog:VoyageExpensesAndCommissionsTextBlock
266 11701 - Disclosure - General and Administrative Expenses Network

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267 Implied Table Table

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268 General and Administrative Expenses Abstract glog:GeneralAndAdministrativeExpensesAbstract
269 General and Administrative Expenses Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeneralAndAdministrativeExpenseExplanatory
270 11801 - Disclosure - Revenues from Contracts with Customers Network

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271 Implied Table Table

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272 Revenues from Contracts with Customers Abstract ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersAbstract
273 Revenues from Contracts with Customers Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRevenueFromContractsWithCustomersExplanatory
274 11901 - Disclosure - Financial Income and Costs Network

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275 Implied Table Table

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276 Financial Income and Costs Abstract glog:FinancialIncomeAndCostsAbstract
277 Financial Income and Costs Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
278 12001 - Disclosure - Contingencies Network

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279 Implied Table Table

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280 Contingencies Abstract ifrs-full:DisclosureOfContingentLiabilitiesAbstract
281 Contingencies Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfContingentLiabilitiesExplanatory
282 12101 - Disclosure - Related Party Transactions Network

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283 Implied Table Table

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284 Related Party Transactions Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
285 Related Party Transactions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
286 12201 - Disclosure - Share-Based Compensation Network

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287 Implied Table Table

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288 Share-Based Compensation Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
289 Share-Based Compensation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
290 12301 - Disclosure - Commitments Network

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291 Implied Table Table

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292 Commitments Abstract ifrs-full:CapitalCommitmentsAbstract
293 Commitments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsExplanatory
294 12401 - Disclosure - Financial Risk Management Network

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295 Implied Table Table

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296 Financial Risk Management Abstract ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsAbstract
297 Financial Risk Management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
298 12501 - Disclosure - Capital Risk Management Network

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299 Implied Table Table

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300 Capital Risk Management Abstract glog:CapitalRiskManagementAbstract
301 Capital Risk Management Concept (Text Block (HTML)) For Period glog:DisclosureOfCapitalRiskManagementTextBlock
302 12601 - Disclosure - Derivative Financial Instruments Network

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303 Implied Table Table

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304 Derivative Financial Instruments Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
305 Derivative Financial Instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDerivativeFinancialInstrumentsExplanatory
306 12701 - Disclosure - Cash Flow Reconciliations Network

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307 Implied Table Table

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309 Cash Flow Reconciliations Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashFlowStatementExplanatory
310 12801 - Disclosure - Taxation Network

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311 Implied Table Table

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312 Taxation Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
313 Taxation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
314 12901 - Disclosure - Earnings/(losses) per share ("EPS") Network

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315 Implied Table Table

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317 Earnings/(losses) per share ("EPS") Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
318 13001 - Disclosure - Subsequent Events Network

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319 Implied Table Table

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320 Subsequent Events Abstract ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodAbstract
321 Subsequent Events Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
322 20202 - Disclosure - Significant Accounting Policies (Policies) Network

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323 Implied Table Table

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325 Statement of compliance Concept (Text Block (HTML)) For Period ifrs-full:StatementOfIFRSCompliance
326 Basis of preparation and approval Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
327 Going concern Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGoingConcernExplanatory
328 Basis of consolidation Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfConsolidationExplanatory
329 Goodwill Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForGoodwillExplanatory
330 Investment in associates Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentInAssociates
331 Investment in joint ventures Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentsInJointVentures
332 Leases Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
333 Deferral and presentation of government grants Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForGovernmentGrants
334 Accounting for (i) revenues and related operating expenses and (ii) voyage expenses and commissions Concept (Text Block (HTML)) For Period glog:DescriptionOfAccountingPolicyForRevenuesAndRelatedOperatingExpensesAndVoyageExpensesAndCommissionsPolicyTextBlock
335 Net pool allocation Concept (Text Block (HTML)) For Period glog:DescriptionOfAccountingPolicyForNetPoolAllocationPolicyTextBlock
336 Financial income and costs Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory
337 Foreign currencies Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
338 Deferred financing costs for undrawn facilities Concept (Text Block (HTML)) For Period glog:DescriptionOfAccountingPolicyForDeferredFinancingCostsForUndrawnFacilitiesPolicyTextBlock
339 Vessels under construction Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForConstructionInProgressExplanatory
340 Tangible fixed assets: Property, plant and equipment Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
341 Impairment of tangible fixed assets, vessels under construction and vessel held under finance lease Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory
342 Reimbursable capital expenditures Concept (Text Block (HTML)) For Period glog:DescriptionOfAccountingPolicyForReimbursableCapitalExpendituresPolicyTextBlock
343 Provisions Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
344 Inventories Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForMeasuringInventories
345 Financial instruments Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
346 Segment Information Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSegmentReportingExplanatory
347 Share-based compensation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
348 Critical accounting judgments and key sources of estimation uncertainty Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
349 Adoption of new and revised IFRS Concept (Text Block (HTML)) For Period glog:DescriptionOfAccountingPolicyForAdoptionOfNewAndRevisedIfrsPolicyTextBlock
350 30103 - Disclosure - Organization and Operations (Tables) Network

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351 Implied Table Table

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352 Organization and Operations Abstract glog:OrganizationAndOperationsAbstract
353 Schedule of partnership acquired 100% of ownership interests in subsidiaries Concept (Text Block (HTML)) For Period glog:ScheduleOfPartnershipAcquiredFullOwnershipInSubsidiaries
354 Schedule of composition of the group's structure Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCompositionOfGroupExplanatory
355 30203 - Disclosure - Significant Accounting Policies (Tables) Network

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356 Implied Table Table

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357 Significant Accounting Policies Abstract glog:AccountingPolicyAbstract
358 Schedule of expected useful lives Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDepreciationAndAmortisationExpenseExplanatory
359 30403 - Disclosure - Equity Transactions (Tables) Network

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360 Implied Table Table

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361 Equity Transactions Abstract glog:EquityTransactionsDisclosureAbstract
362 Schedule of balance of non-controlling interests Concept (Text Block (HTML)) For Period glog:ScheduleOfChangesInNoncontrollingInterestTableTextBlock
363 Schedule of distribution policy and profit allocation Concept (Text Block (HTML)) For Period glog:ScheduleOfDistributionPolicyAndProfitAllocationTableTextBlock
364 30503 - Disclosure - Investment in Associates and Joint Venture (Tables) Network

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365 Implied Table Table

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367 Schedule of investment in associates and joint venture Concept (Text Block (HTML)) For Period glog:DisclosureOfInterestsInAssociatesAndJointVenturesTableTextBlock
368 Rollforward schedule of investment in associates and joint venture Concept (Text Block (HTML)) For Period glog:DisclosureOfRollforwardInAssociateAndJointVentureTableTextBlock
369 Schedule of summarized financial information of associates and joint venture Concept (Text Block (HTML)) For Period glog:DisclosureOfSummarisedFinancialInformationOfAssociateAndJvTableTextBlock
370 30603 - Disclosure - Tangible Fixed Assets, Vessels Under Construction and Vessel Held Under Finance Lease (Tables) Network

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371 Implied Table Table

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373 Schedule of movements in tangible fixed assets, vessels under construction and vessel held under finance lease Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
374 Schedule of vessels under construction Concept (Text Block (HTML)) For Period glog:DisclosureOfDetailedInformationAboutVesselsUnderConstructionTableTextBlock
375 30703 - Disclosure - Sale and Leaseback (Tables) Network

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376 Implied Table Table

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377 Sale and Leaseback Abstract ifrs-full:DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeAbstract
378 Schedule of movements in finance lease liabilities Concept (Text Block (HTML)) For Period glog:ScheduleOfChangesInSaleLeasebackTransactionsTableTextBlock
379 Schedule of commitments in relation to finance leases Concept (Text Block (HTML)) For Period glog:DisclosureOfSaleLeasebackTransactionsMinimumFinanceLeasePaymentsExplanatoryTableTextBlock
380 Schedule of present value of finance lease liabilities Concept (Text Block (HTML)) For Period glog:DisclosureOfSaleLeasebackTransactionsMinimumFinanceLeasePaymentsAtPresentValueExplanatoryTableTextBlock
381 30803 - Disclosure - Cash and Cash Equivalents (Tables) Network

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382 Implied Table Table

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383 Cash and Cash Equivalents Abstract ifrs-full:CashAndCashEquivalentsAbstract
384 Schedule of cash and cash equivalents Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
385 30903 - Disclosure - Trade and Other Receivables (Tables) Network

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386 Implied Table Table

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387 Trade and Other Receivables Abstract ifrs-full:TradeAndOtherCurrentReceivablesAbstract
388 Schedule of trade and other receivables Concept (Text Block (HTML)) For Period glog:DisclosureOfTradeAndOtherCurrentReceivablesTableTextBlock
389 31003 - Disclosure - Other Non-Current Assets (Tables) Network

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390 Implied Table Table

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391 Other Non-Current Assets Abstract ifrs-full:MiscellaneousNoncurrentAssetsAbstract
392 Schedule of other non-current assets Concept (Text Block (HTML)) For Period glog:DisclosureOfAnalysisOfOtherNonCurrentAssetsTableTextBlock
393 31103 - Disclosure - Share Capital (Tables) Network

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394 Implied Table Table

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395 Share Capital Abstract ifrs-full:DisclosureOfClassesOfShareCapitalAbstract
396 Schedule of the movements in the number of shares, the share capital, the Preference Shares, the contributed surplus and the treasury shares Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory
397 31203 - Disclosure - Reserves (Tables) Network

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398 Implied Table Table

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399 Reserves. Abstract glog:ReservesAbstract
400 Schedule of movements in reserves Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReservesAndOtherEquityInterestExplanatory
401 Schedule of dividend distributions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDividendsExplanatory
402 31303 - Disclosure - Borrowings (Tables) Network

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403 Implied Table Table

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404 Borrowings Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
405 Schedule of borrowings Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
406 Debt Repayment Schedule Concept (Text Block (HTML)) For Period glog:DisclosureOfMaturityAnalysisForPrincipalRepaymentsOfDebtTableTextBlock
407 31403 - Disclosure - Other Payables and Accruals (Tables) Network

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408 Implied Table Table

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409 Other Payables and Accruals Abstract ifrs-full:MiscellaneousCurrentLiabilitiesAbstract
410 Schedule of other payables and accruals Concept (Text Block (HTML)) For Period glog:DisclosureOfDetailedInformationAboutAccruedExpensesAndOtherLiabilitiesTextBlock
411 31503 - Disclosure - Vessel Operating and Supervision Costs (Tables) Network

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412 Implied Table Table

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413 Vessel Operating and Supervision Costs Abstract glog:VesselOperatingAndSupervisionCostsAbstract
414 Schedule of vessel operating and supervision costs Concept (Text Block (HTML)) For Period glog:DisclosureOfVesselOperatingAndSupervisionCostsTableTextBlock
415 31603 - Disclosure - Voyage Expenses and Commissions (Tables) Network

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416 Implied Table Table

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417 Voyage Expenses and Commissions Abstract glog:VoyageExpensesAndCommissionsAbstract
418 Schedule of voyage expenses and commissions Concept (Text Block (HTML)) For Period glog:VoyageExpensesAndCommissionsTableTextBlock
419 31703 - Disclosure - General and Administrative Expenses (Tables) Network

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420 Implied Table Table

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421 General and Administrative Expenses Abstract glog:GeneralAndAdministrativeExpensesAbstract
422 Schedule of general and administrative expenses Concept (Text Block (HTML)) For Period glog:DisclosureOfGeneralAndAdministrativeExpensesTableTextBlock
423 31803 - Disclosure - Revenues from Contracts with Customers (Tables) Network

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424 Implied Table Table

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426 Schedule of revenues from Contracts with Customers Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory
427 31903 - Disclosure - Financial Income and Costs (Tables) Network

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428 Implied Table Table

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429 Financial Income and Costs Abstract glog:FinancialIncomeAndCostsAbstract
430 Schedule of financial income and costs Concept (Text Block (HTML)) For Period glog:DisclosureOfDetailedInformationAboutFinancialIncomeAndCostsTableTextBlock
431 32103 - Disclosure - Related Party Transactions (Tables) Network

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432 Implied Table Table

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433 Related Party Transactions Abstract ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesAbstract
434 Schedule of balances with related parties Concept (Text Block (HTML)) For Period glog:DisclosureOfBalancesWithRelatedPartiesTableTextBlock
435 Schedule of transactions with related parties Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
436 Schedule of remuneration of directors and key management Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory
437 32203 - Disclosure - Share-Based Compensation (Tables) Network

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442 SARs Member glog:StockAppreciationRightsOrStockOptionsMember
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446 PCUs Member glog:PerformanceCommonUnitsMember
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448 Entity [Domain] Member dei:EntityDomain
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451 Summary of awards granted Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementExplanatory
452 Summary of significant assumptions used to estimate the fair value Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory
453 Summary of activity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory
454 Summary of activity Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
455 32303 - Disclosure - Commitments (Tables) Network

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456 Implied Table Table

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458 Schedule of commitments as lessee relating to buildings under operating leases Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeExplanatory
459 Schedule of commitments relating to vessels under construction Concept (Text Block (HTML)) For Period glog:DisclosureOfCommitmentsForVesselsUnderConstructionTextBlock
460 Schedule of future gross minimum revenues receivable in relation to non-cancellable time charter agreements Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorExplanatory
461 Schedule of commitments relating to group vessels agreement Concept (Text Block (HTML)) For Period glog:DisclosureOfCommitmentsRelatingToGroupVesselsAgreementsExplanatoryTableTextBlock
462 Schedule of commitments relating to engineering agreements for FSRU conversion of one vessel Concept (Text Block (HTML)) For Period glog:DisclosureOfCommitmentsRelatingToEngineeringAgreementsExplanatoryTableTextBlock
463 32403 - Disclosure - Financial Risk Management (Tables) Network

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464 Implied Table Table

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466 Schedule of expected cash flows for non-derivative financial liabilities Concept (Text Block (HTML)) For Period ifrs-full:MaturityAnalysisForNonderivativeFinancialLiabilities
467 Schedule of expected cash flows for derivative financial instruments Concept (Text Block (HTML)) For Period ifrs-full:MaturityAnalysisForDerivativeFinancialLiabilities
468 Summary of credit risk exposure Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCreditRiskExposureExplanatory
469 32503 - Disclosure - Capital Risk Management (Tables) Network

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470 Implied Table Table

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472 Schedule of the gearing ratio Concept (Text Block (HTML)) For Period glog:DisclosureOfDetailedInformationAboutCapitalRiskManagementTextBlock
473 32603 - Disclosure - Derivative Financial Instruments (Tables) Network

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478 Cross currency swaps Member ifrs-full:CurrencySwapContractMember
479 Forward foreign exchange contracts Member ifrs-full:ForwardContractMember
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481 Schedule of fair value of the derivative assets Concept (Text Block (HTML)) For Period glog:DisclosureOfFairValueOfDerivativeAssetsTableTextBlock
482 Schedule of fair value of the derivative liabilities Concept (Text Block (HTML)) For Period glog:DisclosureOfFairValueOfDerivativeLiabilitiesTableTextBlock
483 Schedule of principal terms of instruments held for trading Concept (Text Block (HTML)) For Period glog:DisclosureOfFinancialInstrumentsHeldForTradingTableTextBlock
484 Schedule of principal terms of the hedging instruments Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsExplanatory
485 Schedule of analysis of (Loss)/gain on swaps Concept (Text Block (HTML)) For Period glog:DisclosureOfLossOnInterestRateSwapsTableTextBlock
486 32703 - Disclosure - Cash Flow Reconciliations (Tables) Network

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487 Implied Table Table

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489 Schedule of reconciliation of borrowings arising from financing activities Concept (Text Block (HTML)) For Period glog:ScheduleOfReconciliationOfBorrowingsArisingFromFinancingActivitiesTableTextBlock
490 Schedule of reconciliation of derivatives arising from financing activities Concept (Text Block (HTML)) For Period glog:DisclosureOfReconciliationOfFinancialInstrumentsFromFinancingActivitiesTableTextBlock
491 Schedule of reconciliation of tangible fixed assets, vessels under construction and vessel held under finance lease arising from investing activities Concept (Text Block (HTML)) For Period glog:ReconciliationOfTangibleFixedAssetsAndVesselsUnderConstructionArisingFromInvestingActivitiesTableTextBlock
492 Schedule of reconciliation of finance lease liabilities arising from financing activities Concept (Text Block (HTML)) For Period glog:ReconciliationOfFinanceLeaseLiabilitiesFromFinancingActivitiesTableTextBlock
493 Schedule of reconciliation of equity offerings arising from financing activities Concept (Text Block (HTML)) For Period glog:ReconciliationOfEquityOfferingsArisingFromFinancingActivitiesTableTextBlock
494 32903 - Disclosure - Earnings/(losses) per share ("EPS") (Tables) Network

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495 Implied Table Table

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497 Schedule of earnings/(losses) per share Concept (Text Block (HTML)) For Period ifrs-full:EarningsPerShareExplanatory
498 40101 - Disclosure - Organization and Operations - General information (Details) Network

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501 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
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503 GAS-three Ltd Member glog:GasThreeLtdMember
504 GAS-four Ltd Member glog:GasFourLtdMember
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509 GasLog Partners LP Member glog:GaslogPartnersLpMember
510 Ifrs Sale of Stock [Axis] Axis glog:IfrsSaleOfStockAxis
511 Sale Of Stock [Domain] Member glog:SaleOfStockDomain
512 IPO Member glog:IfrsIpoMember
513 Over allotment Member glog:IfrsOverAllotmentOptionMember
514 Acquisition of subsidiaries Member glog:AcquisitionOfSubsidiariesMember
515 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
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517 Common shares/units Member ifrs-full:OrdinarySharesMember
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519 General partner units Member glog:GeneralPartnerUnitsMember
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521 Beneficial interest owned by chairman and his family (in percent) Concept (Percent) For Period glog:PercentageOfInterestBeneficiallyOwnByChairman
522 Number of units issued Concept (Shares) For Period glog:NumberOfUnitsIssued
523 Net proceeds after deducting underwriting discounts, commissions and other offering expenses Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
524 Ownership interest in GasLog Partners offered under initial public offering (in percent) Concept (Percent) For Period glog:PercentageOfEquityIssuedUnderPublicOffering
525 Ownership interest in subsidiary (in percent) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
526 Ownership interest in GasLog Partners in transaction with parent (in percent) Concept (Percent) For Period glog:PercentageOfEquityIssuedUnderExchangeToParent
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529 Cash consideration paid to GasLog in exchange for the contribution of net assets Concept (Monetary) For Period Credit glog:CashConsiderationPaidToParentForAcquiringSubsidiaries
530 40102 - Disclosure - Organization and Operations - Composition of the group (Details) Network

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531 Disclosure of organization and operations [table] Table

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 glog:DisclosureOfOrganizationAndOperationsTable
532 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
533 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
534 100% interest subsidiaries Member glog:SubsidiariesWith100PercentOwnershipMember
535 GasLog Investments Ltd Member glog:GaslogInvestmentsLtdMember
536 GasLog Carriers Ltd Member glog:GaslogCarriersLtdMember
537 GasLog Shipping Company, Ltd. Member glog:GaslogShippingCompanyLtdMember
538 GasLog Partners GP LLC Member glog:GaslogPartnersGpLlcMember
539 GasLog Cyprus Investments Ltd Member glog:GaslogCyprusInvestmentsLtdMember
540 GasLog Services UK Ltd Member glog:GaslogServicesUkLtdMember
541 GasLog Services US Inc Member glog:GaslogServicesUsIncMember
542 GasLog Asia Pte Ltd Member glog:GaslogAsiaPteLtdMember
543 GasLog LNG Services Ltd. Member glog:GasLogLngServicesLtdMember
544 GasLog Monaco S.A.M. Member glog:GaslogMonacoSaMMember
545 GAS-one Ltd Member glog:GasOneLtdMember
546 GAS-two Ltd Member glog:GasTwoLtdMember
547 GAS-six Ltd Member glog:GasSixLtdMember
548 GAS-nine Ltd Member glog:GasNineLtdMember
549 GAS-ten Ltd Member glog:GasTenLtdMember
550 GAS-twelve Ltd Member glog:GasTwelveLtdMember
551 GAS-fifteen Ltd Member glog:GasFifteenLtdMember
552 GAS-eighteen Ltd Member glog:GasEighteenLtdMember
553 GAS-twenty two Ltd Member glog:GasTwentyTwoLtdMember
554 GAS-twenty three Ltd Member glog:GasTwentyThreeLtdMember
555 GAS-twenty four Ltd Member glog:GasTwentyFourLtdMember
556 GAS-twenty five Ltd Member glog:GasTwentyFiveLtdMember
557 GAS-twenty six Ltd Member glog:GasTwentySixLtdMember
558 GAS-twenty eight Ltd Member glog:GasTwentyEightLtdMember
559 GAS-twenty nine Ltd Member glog:GasTwentyNineLtdMember
560 GAS-thirty Ltd Member glog:GasThirtyLtdMember
561 GAS-thirty one Ltd Member glog:GasThirtyOneLtdMember
562 GAS-thirty two Ltd Member glog:GasThirtyTwoLtdMember
563 GAS-thirty three Ltd Member glog:GasThirtyThreeLtdMember
564 GAS-thirty four Ltd Member glog:GasThirtyFourLtdMember
565 GAS-thirty five Ltd Member glog:GasThirtyFiveLtdMember
566 GAS-thirty six Ltd Member glog:GasThirtySixLtdMember
567 GAS-thirty seven Ltd Member glog:GasThirtySevenLtdMember
568 GasLog Shipping Limited Member glog:GaslogShippingLimitedMember
569 Subsidiaries with 27.5 percent ownership Member glog:SubsidiariesWith27.5PercentOwnershipMember
570 GasLog Partners LP Member glog:GaslogPartnersLpMember
571 GasLog Partners Holdings LLC Member glog:GaslogPartnersHoldingsLlcMember
572 GAS-three Ltd Member glog:GasThreeLtdMember
573 GAS-four Ltd Member glog:GasFourLtdMember
574 GAS-five Ltd Member glog:GasFiveLtdMember
575 GAS-seven Ltd Member glog:GasSevenLtdMember
576 GAS-eight Ltd Member glog:GasEightLtdMember
577 GAS-eleven Ltd Member glog:GasElevenLtdMember
578 GAS-thirteen Ltd Member glog:GasThirteenLtdMember
579 GAS-fourteen Ltd Member glog:GasFourteenLtdMember
580 GAS-sixteen Ltd Member glog:GasSixteenLtdMember
581 GAS-seventeen Ltd Member glog:GasSeventeenLtdMember
582 GAS-nineteen Ltd Member glog:GasNineteenLtdMember
583 GAS-twenty Ltd Member glog:GasTwentyLtdMember
584 GAS-twenty one Ltd Member glog:GasTwentyOneLtdMember
585 GAS-twenty seven Ltd Member glog:GasTwentySevenLtdMember
586 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
587 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
588 Egypt LNG Shipping Ltd / Associate Member glog:EgyptLngShippingLtdMember
589 Gastrade / Associate Member glog:GastradeS.A.Member
590 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
591 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
592 The Cool Pool Limited / Joint venture Member glog:CoolPoolLimitedMember
593 Legal Entity [Axis] Axis dei:LegalEntityAxis
594 Entity [Domain] Member dei:EntityDomain
595 Golar - Cool Pool participant Member glog:GolarMember
596 Dynagas - Cool Pool participant Member glog:DynagasMember
597 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
598 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
599 Preference shares/units Member ifrs-full:PreferenceSharesMember
600 Series A Cumulative Redeemable Perpetual Preference Shares Member glog:SeriesaCumulativeRedeemablePerpetualPreferenceSharesMember
601 Organization and Operations LineItems glog:OrganizationAndOperationsLineItems
602 Ownership interest in subsidiary (in percent) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
603 Ownership interest in associate (in percent) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
604 Ownership interest in joint venture (in percent) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
605 LNG Cargo capacity (in cbm) per vessel Concept (num:volumeItemType) For Period glog:LiquidNaturalGasCargoCapacity
606 Number of LNG carriers operating in the Cool Pool Concept (Integer) For Period glog:NumberOfVesselsInCarryingPool
607 Number of owned LNG carriers operating in the Cool Pool Concept (Integer) For Period glog:NumberOfVesselsOwnedInCarryingPool
608 Number of vessels removed from Cool Pool Concept (Integer) For Period glog:NumberOfVesselsRemovedFromCarryingPool
609 Average number of employees employed Concept (Decimal) For Period ifrs-full:AverageNumberOfEmployees
610 Interest rate on Cumulative Redeemable Perpetual Preference Shares (in percent) Concept (Percent) For Period glog:InterestRateOnCumulativePreferredShares
611 40201 - Disclosure - Significant Accounting Policies - Going concern (Details) Network

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612 Disclosure of detailed information about borrowings [table] Table

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 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
613 Maturity [axis] Axis ifrs-full:MaturityAxis
614 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
615 Maturity In November 2019 Member glog:MaturityInNovember2019Member
616 Legal Entity [Axis] Axis dei:LegalEntityAxis
617 Entity [Domain] Member dei:EntityDomain
618 GasLog Partners LP Member glog:GaslogPartnersLpMember
619 Range [axis] Axis ifrs-full:RangeAxis
620 Ranges [member] Member ifrs-full:RangesMember
621 Maximum Member ifrs-full:TopOfRangeMember
622 Going concern LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
623 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
624 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
625 Working capital position Concept (Monetary) As Of Debit ifrs-full:CurrentAssetsLiabilities
626 Borrowings, current portion Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
627 Refinance of outstanding debt Concept (Monetary) For Period Credit glog:RefinanceOfOutstandingDebt
628 40202 - Disclosure - Significant Accounting Policies - Useful lives (Details) Network

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 http://www.gaslogltd.com/role/DisclosureSignificantAccountingPoliciesUsefulLivesDetails
629 Disclosure of detailed information about property, plant and equipment [table] Table

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 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
630 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
631 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
632 Vessels Member ifrs-full:ShipsMember
633 Dry-docking component Member glog:DryDockingMember
634 Furniture, computer, software and other office equipment Member glog:FurnitureComputerSoftwareAndOtherOfficeEquipmentMember
635 Leasehold improvements Member ifrs-full:LeaseholdImprovementsMember
636 Range [axis] Axis ifrs-full:RangeAxis
637 Ranges [member] Member ifrs-full:RangesMember
638 Minimum Member ifrs-full:BottomOfRangeMember
639 Maximum Member ifrs-full:TopOfRangeMember
640 Useful lives of long lived assets LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
641 Useful lives Concept (xbrli:durationItemType) For Period glog:UsefulLivesPropertyPlantAndEquipment
642 40203 - Disclosure - Significant Accounting Policies - Classification of the non-controlling interests (Details) Network

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 http://www.gaslogltd.com/role/DisclosureSignificantAccountingPoliciesClassificationOfNonControllingInterestsDetails
643 Disclosure of subsidiaries [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
644 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
645 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
646 GasLog Partners LP Member glog:GaslogPartnersLpMember
647 Legal Entity [Axis] Axis dei:LegalEntityAxis
648 Entity [Domain] Member dei:EntityDomain
649 GasLog Partners LP Member glog:GaslogPartnersLpMember
650 Disclosure of subsidiaries LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
651 GasLog Partner common units not directly or indirectly held by GasLog Concept (Integer) As Of glog:NoncontrollingCommonUnits
652 Available cash percentage the Partnership is required to distribute Concept (Percent) For Period glog:PercentPartnershipRequiredToDistributeAvailableCash
653 Number of days after the quarter cash distributed to partners Concept (xbrli:durationItemType) For Period glog:NumberOfDaysAfterQuarterCashDistributedToPartner
654 40204 - Disclosure - Significant Accounting Policies - Key sources of estimation uncertainty (Details) Network

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 http://www.gaslogltd.com/role/DisclosureSignificantAccountingPoliciesKeySourcesOfEstimationUncertaintyDetails
655 Disclosure of detailed information about property, plant and equipment [table] Table

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 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
656 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
657 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
658 Vessels Member ifrs-full:ShipsMember
659 Steam Vessels Member glog:SteamVesselsMember
660 TFDE Vessels Member glog:TfdeVesselsMember
661 Range [axis] Axis ifrs-full:RangeAxis
662 Ranges [member] Member ifrs-full:RangesMember
663 Average Member ifrs-full:WeightedAverageMember
664 Useful lives of long lived assets LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
665 Vessels Abstract glog:VesselsAbstract
666 Number of vessels with carrying amount higher than the charter free market values Concept (Integer) As Of glog:NumberOfVessels
667 Vessels utilization rate assumed (as a percent) Concept (Percent) For Period glog:UtilizationPercentageOfVesselsAssumed
668 Charter agreement term used to determine rate, up to December 31, 2023 Concept (xbrli:durationItemType) For Period glog:TermOfCharterAgreement
669 Charter market rate used (per day) Concept (Monetary) For Period Credit glog:CharterMarketRatePerDay
670 Number of years of historical average used to estimate the average time charter rate after January 1, 2024 Concept (xbrli:durationItemType) For Period glog:NumberOfYearsOfHistoricalAverage
671 Number of years of charter rates used to estimate the average time charter rate after January 1, 2024 Concept (xbrli:durationItemType) For Period glog:NumberOfYearsOfCharterRates
672 Break-even charter hire rate (per day) Concept (Monetary) For Period Credit glog:BreakEvenCharterHireRate
673 Charter hire rate used for sensitivity analysis (per day) Concept (Monetary) For Period Credit glog:CharterHireRateUsedForSensitivityAnalysis
674 Percentage of decrease in break-even charter hire rate for sensitivity analysis Concept (Percent) For Period glog:PercentageOfDecreaseInBreakEvenCharterHireRateForSensitivityAnalysis
675 Aggregate impairment charge resulting from sensitivity analysis Concept (Monetary) For Period Debit glog:ImpairmentLossDueToPotentialDecreaseInAverageCharterRate
676 Annual escalation factor for operating expenses (as a percent) Concept (Percent) As Of glog:PercentageOfAnnualOperatingEscalationFactor
677 Weighted average cost of capital Concept (Percent) As Of glog:PercentageOfWeightedAverageCostOfCapital
678 Impairment loss of vessels Concept (Monetary) For Period Debit ifrs-full:ImpairmentLoss
679 Impairment loss of goodwill Concept (Monetary) For Period ifrs-full:ImpairmentLossRecognisedInProfitOrLossGoodwill
680 40205 - Disclosure - Significant Accounting Policies - Standards and interpretations adopted in current period (Details) Network

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 http://www.gaslogltd.com/role/DisclosureSignificantAccountingPoliciesStandardsAndInterpretationsAdoptedInCurrentPeriodDetails
681 Statement [Table] Table

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 us-gaap:StatementTable
682 Initially applied IFRSs [axis] Axis ifrs-full:InitiallyAppliedIFRSsAxis
683 Initially applied IFRSs [member] Member ifrs-full:InitiallyAppliedIFRSsMember
684 Increase (decrease) due to application of IFRS 15 Member ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
685 Increase (decrease) due to application of IFRS 9 Member glog:IncreaseDecreaseDueToApplicationOfIfrs9Member
686 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
687 Equity [member] Member ifrs-full:EquityMember
688 Retained earnings/(accumulated deficit) Member ifrs-full:RetainedEarningsMember
689 Reserves Member ifrs-full:OtherReservesMember
690 Statement LineItems us-gaap:StatementLineItems
691 Equity Concept (Monetary) As Of Credit ifrs-full:Equity
692 Other payables and accruals Concept (Monetary) As Of Credit ifrs-full:CurrentAccruedExpensesAndOtherCurrentLiabilities
693 40206 - Disclosure - Significant Accounting Policies - Standards and amendments not yet adopted (Details) Network

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 http://www.gaslogltd.com/role/DisclosureSignificantAccountingPoliciesStandardsAndAmendmentsNotYetAdoptedDetails
694 Disclosure of expected impact of initial application of new standards or interpretations [table] Table

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 ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsTable
695 New IFRSs [axis] Axis ifrs-full:NewIFRSsAxis
696 New IFRSs [member] Member ifrs-full:NewIFRSsMember
697 Increase (decrease) due to application of IFRS 16 Member glog:IncreaseDecreaseDueToApplicationOfIfrs16Member
698 Disclosure of expected impact of initial application of new standards or interpretations LineItems ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretationsLineItems
699 Assets Concept (Monetary) As Of Debit ifrs-full:Assets
700 (Accumulated deficit)/retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
701 Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
702 40301 - Disclosure - Goodwill (Details) Network

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703 Disclosure of information for cash-generating units [table] Table

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 ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable
704 Classes of intangible assets and goodwill [axis] Axis ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
705 Intangible assets and goodwill [member] Member ifrs-full:IntangibleAssetsAndGoodwillMember
706 Goodwill Member ifrs-full:GoodwillMember
707 Assumptions LineItems ifrs-full:DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems
708 Average inflation rate Concept (Percent) As Of glog:CashFlowProjectionAssumptionAverageInflationRate
709 Pre-tax discount rate Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesAppliedToCashFlowProjections
710 Annual growth rate Concept (Percent) As Of ifrs-full:DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
711 Foreign exchange rate (EUR/USD) Concept (Decimal) For Period ifrs-full:AverageForeignExchangeRate
712 40401 - Disclosure - Equity Transactions - Offerings (Details) Network

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713 Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Table

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 glog:IFRSSubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable
714 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
715 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
716 Common shares/units Member ifrs-full:OrdinarySharesMember
717 Preference shares/units Member ifrs-full:PreferenceSharesMember
718 Partnership's Series A Preference Units Member glog:SeriesCumulativeRedeemablePerpetualFixedToFloatingPreferenceRateSharesMember
719 Partnership's Series B Preference Units Member glog:SeriesBCumulativeRedeemablePerpetualFixedToFloatingRatePreferenceSharesMember
720 Partnership's Series C Preference Units Member glog:SeriesCCumulativeRedeemablePerpetualFixedToFloatingRatePreferenceSharesMember
721 Ifrs Sale of Stock [Axis] Axis glog:IfrsSaleOfStockAxis
722 Sale Of Stock [Domain] Member glog:SaleOfStockDomain
723 ATM Programme Member glog:AtMarketProgramMember
724 Legal Entity [Axis] Axis dei:LegalEntityAxis
725 Entity [Domain] Member dei:EntityDomain
726 GasLog Partners LP Member glog:GaslogPartnersLpMember
727 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
728 Counterparties [member] Member ifrs-full:CounterpartiesMember
729 Underwriters Member glog:UnderwritersMember
730 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
731 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
732 RCUs Member glog:RestrictedCommonUnitsMember
733 PCUs Member glog:PerformanceCommonUnitsMember
734 Equity transactions LineItems glog:EquityTransactionsLineItems
735 Number of units issued Concept (Shares) For Period glog:NumberOfUnitsIssued
736 Price per unit/share (in dollars per unit/share) Concept (Share) For Period glog:PricePerShare
737 Net proceeds after deducting underwriting discounts, commissions and other offering expenses Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
738 Distribution rate Concept (Percent) For Period glog:PreferenceUnitsDistributionRate
739 Liquidation preference per share/unit (in dollars per share/unit) Concept (Share) For Period glog:LiquidationPreferencePerShare
740 Aggregate offering value Concept (Monetary) As Of Debit glog:AggregateOfferingValue
741 Number of subordinated units converted into common units Concept (Shares) For Period glog:NumberOfUnitsIssuedForConversionOfSubordinatedUnitsToCommonUnits
742 Conversion ratio of subordinated units to common units Concept (Pure) For Period glog:SubordinatedUnitsToCommonUnitsConversionRatio
743 Number of units vested during the period Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
744 40402 - Disclosure - Equity Transactions - Balance of non-controlling interests (Details) Network

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745 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
746 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
747 Equity [member] Member ifrs-full:EquityMember
748 Non-controlling interests Member ifrs-full:NoncontrollingInterestsMember
749 Changes in equity LineItems ifrs-full:StatementOfChangesInEquityLineItems
750 Balance at beginning of year Concept (Monetary) As Of Credit ifrs-full:Equity
751 Net proceeds from the Partnership's equity offerings Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangeInEquityOfSubsidiaries
752 Dividend declared Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
753 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
754 Balance at the end of the year Concept (Monetary) As Of Credit ifrs-full:Equity
755 40403 - Disclosure - Equity Transactions - Distribution policy (Details) Network

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756 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
757 Distribution Tier [Axis] Axis glog:DistributionTierAxis
758 Distribution Tier [Domain] Member glog:DistributionTierDomain
759 Minimum Quarterly Distribution Member glog:MinimumQuarterlyDistributionMember
760 First Target Distribution Member glog:FirstTargetDistributionMember
761 Second Target Distribution Member glog:SecondTargetDistributionMember
762 Third Target Distribution Member glog:ThirdTargetDistributionMember
763 Thereafter Member glog:DistributionsSubsequentToThirdTargetMember
764 Legal Entity [Axis] Axis dei:LegalEntityAxis
765 Entity [Domain] Member dei:EntityDomain
766 GasLog Partners LP Member glog:GaslogPartnersLpMember
767 Range [axis] Axis ifrs-full:RangeAxis
768 Ranges [member] Member ifrs-full:RangesMember
769 Minimum Member ifrs-full:BottomOfRangeMember
770 Maximum Member ifrs-full:TopOfRangeMember
771 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
772 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
773 Common shares/units Member ifrs-full:OrdinarySharesMember
774 General partner units Member glog:GeneralPartnerUnitsMember
775 IDRs Member glog:IncentiveDistributionRightsMember
776 Distribution policy LineItems ifrs-full:StatementOfChangesInEquityLineItems
777 Amount paid in exchange of waiving of rights to holders of existing IDRs Concept (Monetary) For Period Credit glog:PaymentInExchangeOfWaivingOfRights
778 Total Quarterly Distribution Target Amount Concept (Share) For Period glog:TotalQuarterlyDistributionTargetAmount
779 Marginal percentage interest in distributions Concept (Percent) For Period glog:MarginalPercentageInterestInDistributions
780 40404 - Disclosure - Equity Transactions - Allocation of GasLog Partners' profit (Details) Network

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 http://www.gaslogltd.com/role/DisclosureEquityTransactionsAllocationOfGaslogPartnersProfitDetails
781 Disclosure of subsidiaries [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
782 Legal Entity [Axis] Axis dei:LegalEntityAxis
783 Entity [Domain] Member dei:EntityDomain
784 GasLog Partners LP Member glog:GaslogPartnersLpMember
785 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
786 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
787 Common shares/units Member ifrs-full:OrdinarySharesMember
788 Subordinated units Member glog:SubordinatedUnitsMember
789 General partner units Member glog:GeneralPartnerUnitsMember
790 IDRs Member glog:IncentiveDistributionRightsMember
791 Preference shares/units Member ifrs-full:PreferenceSharesMember
792 Disclosure of subsidiaries LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
793 Allocation of GasLog Partners' profit Abstract ifrs-full:ProfitLossAttributableToAbstract
794 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
795 Profit/(loss) for the year attributable to owners of the Group Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
796 Profit and total comprehensive income allocated to non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
797 40405 - Disclosure - Equity Transactions - Distributions (Details) Network

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798 Disclosure Of Dividend Distributions [Table] Table

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 glog:DisclosureOfDividendDistributionsTable
799 Legal Entity [Axis] Axis dei:LegalEntityAxis
800 Entity [Domain] Member dei:EntityDomain
801 GasLog Partners LP Member glog:GaslogPartnersLpMember
802 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
803 Equity [member] Member ifrs-full:EquityMember
804 Non-controlling interests Member ifrs-full:NoncontrollingInterestsMember
805 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
806 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
807 Common shares/units Member ifrs-full:OrdinarySharesMember
808 Preference shares/units Member ifrs-full:PreferenceSharesMember
809 Dividend distributions LineItems glog:DividendDistributionsLineItems
810 Dividend declared Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
811 40501 - Disclosure - Investment in Associates and Joint Venture - Associate (Details) Network

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 http://www.gaslogltd.com/role/DisclosureInvestmentInAssociatesAndJointVentureAssociateDetails
812 Disclosure of associates [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
813 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
814 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
815 Associates Member ifrs-full:AssociatesMember
816 Egypt LNG Shipping Ltd / Associate Member glog:EgyptLngShippingLtdMember
817 Gastrade / Associate Member glog:GastradeS.A.Member
818 Interest in Associate LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
819 Equity interest in associate (as a percent) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
820 Cargo capacity (in cbm) Concept (num:volumeItemType) For Period glog:LiquidNaturalGasCargoCapacity
821 Rollforward of investment in associate and joint venture Abstract glog:RollforwardOfInvestmentsInSubsidiariesJointVenturesAndAssociatesAbstract
822 Beginning balance Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
823 Additions Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInInvestmentsAccountedForUsingEquityMethod
824 Share of profit of associates Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
825 Return of investment from associate Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod
826 Dividend declared Concept (Monetary) For Period Debit glog:DividendsReceivedAndReceivable
827 Ending balance Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
828 40502 - Disclosure - Investment in Associates and Joint Venture - Associate Financial Information (Details) Network

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829 Disclosure of associates [table] Table

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 ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesTable
830 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
831 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
832 Associates Member ifrs-full:AssociatesMember
833 Interest in Associate LineItems ifrs-full:DisclosureOfSignificantInvestmentsInAssociatesLineItems
834 Summarized net assets Abstract ifrs-full:NetAssetsLiabilitiesAbstract
835 Current Abstract glog:CurrentAbstract
836 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
837 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
838 Non-current Abstract glog:NoncurrentAbstract
839 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
840 Total non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
841 Net assets Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
842 Group's share Concept (Monetary) As Of Debit glog:GroupSShareInvestmentsAssociateAndJointVentures
843 Effect from translation Concept (Monetary) As Of Debit glog:EffectOfTranslationOnInvestmentsAccountedForUsingEquityMethod
844 Goodwill Concept (Monetary) As Of Debit glog:GoodwillIncludedInInvestmentsAccountedForUsingEquityMethod
845 Investment in associates and joint venture Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
846 Financial information from the statements of profit or loss Abstract ifrs-full:IncomeStatementAbstract
847 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
848 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
849 Total comprehensive income for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
850 Group's share in profit Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
851 Dividend declared Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
852 Group's share in dividend Concept (Monetary) For Period Debit glog:DividendsReceivedAndReceivable
853 40503 - Disclosure - Investment in Associates and Joint Venture - Joint Venture (Details) Network

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 http://www.gaslogltd.com/role/DisclosureInvestmentInAssociatesAndJointVentureJointVentureDetails
854 Disclosure of joint ventures [table] Table

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*

 ifrs-full:DisclosureOfJointVenturesTable
855 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
856 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
857 Joint ventures Member ifrs-full:JointVenturesMember
858 The Cool Pool Limited / Joint venture Member glog:CoolPoolLimitedMember
859 Interest in joint venture LineItems ifrs-full:DisclosureOfJointVenturesLineItems
860 Equity interest in joint venture (as a percent) Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
861 Summarized net assets Abstract ifrs-full:NetAssetsLiabilitiesAbstract
862 Current Abstract glog:CurrentAbstract
863 Total current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
864 Total current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
865 Non-current Abstract glog:NoncurrentAbstract
866 Total non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
867 Total non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
868 Net assets Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
869 Group's share Concept (Monetary) As Of Debit glog:GroupSShareInvestmentsAssociateAndJointVentures
870 Effect from translation Concept (Monetary) As Of Debit glog:EffectOfTranslationOnInvestmentsAccountedForUsingEquityMethod
871 Goodwill Concept (Monetary) As Of Debit glog:GoodwillIncludedInInvestmentsAccountedForUsingEquityMethod
872 Investment in associates and joint venture Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
873 Consolidated statements of profit or loss Abstract ifrs-full:IncomeStatementAbstract
874 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
875 Profit for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
876 Total comprehensive income for the year Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
877 Group's share in profit Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
878 Dividend declared Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
879 Group's share in dividend Concept (Monetary) For Period Debit glog:DividendsReceivedAndReceivable
880 40601 - Disclosure - Tangible Fixed Assets, Vessels Under Construction and Vessel Held Under Finance Lease (Details) Network

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 http://www.gaslogltd.com/role/DisclosureTangibleFixedAssetsVesselsUnderConstructionAndVesselHeldUnderFinanceLeaseDetails
881 Disclosure of detailed information about property, plant and equipment [table] Table

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*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
882 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
883 Carrying amount [member] Member ifrs-full:CarryingAmountMember
884 Cost Member ifrs-full:GrossCarryingAmountMember
885 Accumulated depreciation Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
886 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
887 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
888 Tangible fixed assets Member glog:TangibleFixedAssetsMember
889 Vessels Member ifrs-full:ShipsMember
890 Office property and other tangible assets Member ifrs-full:OfficeEquipmentMember
891 Vessels under construction Member ifrs-full:ConstructionInProgressMember
892 Vessels held under financial lease Member glog:PropertyPlantAndEquipmentHeldUnderFinanceLeasesMember
893 Legal Entity [Axis] Axis dei:LegalEntityAxis
894 Entity [Domain] Member dei:EntityDomain
895 GAS-twenty two Ltd. Member glog:GSTwentyTwoLtdMember
896 GAS-twenty four Ltd. and GAS-twenty five Ltd Member glog:GasTwentyFourLtd.AndGasTwentyFiveLtdMember
897 GAS-twenty three Ltd Member glog:GasTwentyThreeLtdMember
898 GAS-twenty nine Ltd Member glog:GasTwentyNineLtdMember
899 GAS-twenty eight Ltd Member glog:GasTwentyEightLtdMember
900 GAS-thirty one Ltd Member glog:GasThirtyOneLtdMember
901 GAS-thirty Ltd Member glog:GasThirtyLtdMember
902 GAS-thirty two Ltd Member glog:GasThirtyTwoLtdMember
903 GAS-thirty three Ltd Member glog:GasThirtyThreeLtdMember
904 GAS-thirty four Ltd Member glog:GasThirtyFourLtdMember
905 GAS-thirty five Ltd Member glog:GasThirtyFiveLtdMember
906 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
907 Counterparties [member] Member ifrs-full:CounterpartiesMember
908 Ship building contracts with Samsung Member glog:SamsungMember
909 Ship building contracts with Hyundai Member glog:HyundaiMember
910 HOA with Samsung Member glog:HeadsOfAgreementWithSamsungMember
911 Agreement with Keppel Member glog:AgreementWithKeppelShipyardLimitedMember
912 Property, plant and equipment LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
913 Balance, at the beginning of the year Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
914 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
915 Depreciation Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
916 Transfer from vessels under construction Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersFromConstructionInProgressPropertyPlantAndEquipment
917 Transfer under "Other non-current assets" Concept (Monetary) For Period Credit glog:DecreaseThroughTransfersUnderOtherNonCurrentAssetsPropertyPlantAndEquipment
918 Fully amortized fixed assets Concept (Monetary) For Period Credit ifrs-full:RetirementsPropertyPlantAndEquipment
919 Balance, at the end of the year Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
920 Vessels pledged as collateral Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipmentPledgedAsSecurity
921 Number of LNG carriers per the shipbuilding contract Concept (Decimal) For Period glog:NumberOfLngCarrierEnteredIntoContractForConstruction
922 Cargo capacity (in cbm) Concept (num:volumeItemType) For Period glog:LiquidNaturalGasCargoCapacity
923 Amount paid to Samsung for potential conversion of existing vessel Concept (Monetary) As Of Credit glog:PaymentsMadeForPotentialConversionOfExistingVessel
924 Amount paid to Keppel for detailed engineering in relation to FSRU conversion of vessel Concept (Monetary) As Of Credit glog:PaymentMadeForDetailedEngineeringInRelationToFsruConversionOfVessel
925 Number of vessels under FSRU conversion Concept (Integer) For Period glog:NumberOfVesselsUnderFsruConversion
926 Progress shipyard installments Concept (Monetary) As Of Debit glog:ProgressShipyardInstallmentCosts
927 Onsite supervision costs Concept (Monetary) As Of Debit glog:OnsiteSupervisionCosts
928 Critical spare parts, equipment and other vessel delivery expenses Concept (Monetary) As Of Debit glog:CriticalSparePartsEquipmentAndOtherVesselDeliveryExpenses
929 40701 - Disclosure - Sale and Leaseback (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureSaleAndLeasebackDetails
930 Disclosure of recognised finance lease as assets by lessee [table] Table

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*

 ifrs-full:DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeTable
931 Legal Entity [Axis] Axis dei:LegalEntityAxis
932 Entity [Domain] Member dei:EntityDomain
933 GAS-twenty six Ltd Member glog:GasTwentySixLtdMember
934 Range [axis] Axis ifrs-full:RangeAxis
935 Ranges [member] Member ifrs-full:RangesMember
936 Minimum Member ifrs-full:BottomOfRangeMember
937 Maximum Member ifrs-full:TopOfRangeMember
938 Sale and Leaseback LineItems ifrs-full:DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeLineItems
939 Proceeds from sale and finance leaseback Concept (Monetary) For Period Debit glog:ProceedsFromSaleAndFinanceLeaseback
940 Leaseback bareboat charter period in years Concept (xbrli:durationItemType) For Period glog:SaleLeasebackTransactionLeaseTerm
941 Sale leaseback, repurchase period Concept (xbrli:durationItemType) For Period glog:SaleLeasebackRepurchasePeriod
942 Duration of bareboat hire holiday period which expired on September 21, 2016 (in days) Concept (xbrli:durationItemType) For Period glog:SaleLeasebackTransactionsLeasePaymentsHolidayPeriod
943 Movements in finance lease liabilities Abstract glog:ChangesInSaleLeasebackTransactionsAbstract
944 Finance lease liabilities at the beginning of the period Concept (Monetary) As Of Credit ifrs-full:FinanceLeaseLiabilities
945 Finance lease charge Concept (Monetary) For Period Credit glog:FinanceLeaseCharge
946 Payments Concept (Monetary) For Period Debit glog:PaymentsOfFinanceLeaseLiabilities
947 Finance lease liabilities at the end of the period Concept (Monetary) As Of Credit ifrs-full:FinanceLeaseLiabilities
948 Finance lease liabilities breakdown Abstract glog:FinanceLeaseLiabilitiesAbstract
949 Finance lease liability, current portion Concept (Monetary) As Of Credit ifrs-full:CurrentFinanceLeaseLiabilities
950 Finance lease liability, non-current portion Concept (Monetary) As Of Credit ifrs-full:NoncurrentFinanceLeaseLiabilities
951 Total Concept (Monetary) As Of Credit ifrs-full:FinanceLeaseLiabilities
952 40702 - Disclosure - Sale and Leaseback - Commitments (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureSaleAndLeasebackCommitmentsDetails
953 Disclosure of recognised finance lease as assets by lessee [table] Table

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*

 ifrs-full:DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeTable
954 Maturity [axis] Axis ifrs-full:MaturityAxis
955 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
956 Not later than one year Member ifrs-full:NotLaterThanOneYearMember
957 Later than one year and not later than three years Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
958 Later than three years and not later than five years Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
959 More than five years Member ifrs-full:LaterThanFiveYearsMember
960 Commitments in relation to finance leases LineItems ifrs-full:DisclosureOfRecognisedFinanceLeaseAsAssetsByLesseeLineItems
961 Minimum lease payments Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayable
962 Future finance charges Concept (Monetary) As Of Credit ifrs-full:FutureFinanceChargeOnFinanceLease
963 Finance lease liabilities Concept (Monetary) As Of Credit ifrs-full:MinimumFinanceLeasePaymentsPayableAtPresentValue
964 40801 - Disclosure - Cash and Cash Equivalents (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureCashAndCashEquivalentsDetails
965 Implied Table Table

*

*

 implied:Table
966 Cash and Cash Equivalents Abstract ifrs-full:CashAndCashEquivalentsAbstract
967 Current accounts Concept (Monetary) As Of Debit ifrs-full:BalancesWithBanks
968 Time deposits (with original maturities of three months or less) Concept (Monetary) As Of Debit ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
969 Ship management client accounts Concept (Monetary) As Of Debit glog:CashAndCashEquivalentsShipManagementClientAccounts
970 Total cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
971 40901 - Disclosure - Trade and Other Receivables (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureTradeAndOtherReceivablesDetails
972 Implied Table Table

*

*

 implied:Table
973 Trade and Other Receivables Abstract ifrs-full:TradeAndOtherCurrentReceivablesAbstract
974 Trade receivables Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
975 VAT receivable Concept (Monetary) As Of Debit ifrs-full:CurrentValueAddedTaxReceivables
976 Accrued income Concept (Monetary) As Of Debit ifrs-full:CurrentAccruedIncome
977 Insurance claims Concept (Monetary) As Of Debit glog:CurrentInsuranceClaims
978 Other receivables Concept (Monetary) As Of Debit ifrs-full:OtherCurrentReceivables
979 Total Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
980 Allowance for receivables Concept (Monetary) As Of Credit ifrs-full:AllowanceAccountForCreditLossesOfFinancialAssets
981 41001 - Disclosure - Other Non-Current Assets (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureOtherNonCurrentAssetsDetails
982 Implied Table Table

*

*

 implied:Table
983 Other Non-Current Assets Abstract ifrs-full:MiscellaneousNoncurrentAssetsAbstract
984 Various guarantees Concept (Monetary) As Of Debit glog:VariousGuaranteesOtherNonCurrentAssets
985 Other long-term assets Concept (Monetary) As Of Debit glog:MiscellaneousOtherLongTermAssets
986 Total Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
987 41101 - Disclosure - Share Capital (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureShareCapitalDetails
988 Disclosure of classes of share capital [table] Table

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*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
989 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
990 Equity [member] Member ifrs-full:EquityMember
991 Issued capital Member ifrs-full:IssuedCapitalMember
992 Treasury shares Member ifrs-full:TreasurySharesMember
993 Contributed surplus Member ifrs-full:SharePremiumMember
994 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
995 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
996 Common shares/units Member ifrs-full:OrdinarySharesMember
997 Preference shares/units Member ifrs-full:PreferenceSharesMember
998 Share Capital LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
999 Shares authorized (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
1000 Par value per share (in dollar per share) Concept (Share) As Of ifrs-full:ParValuePerShare
1001 Shares issued Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
1002 Movements in number of shares, share capital, preference shares, contributed surplus and treasury shares Abstract ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
1003 Outstanding at beginning of year (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
1004 Balance at beginning of year Concept (Monetary) As Of Credit ifrs-full:Equity
1005 Purchase of treasury shares (in shares) Concept (Shares) For Period glog:IncreaseDecreaseThroughNetTreasurySharesTransactionsShares
1006 Purchase of treasury shares Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions
1007 Treasury shares distributed for awards vested or exercised in the year (in shares) Concept (Shares) For Period glog:NumberOfSharesIncreaseDecreaseThroughShareBasedPaymentTransactionsEquity
1008 Treasury shares distributed for awards vested or exercised in the year Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
1009 Equity raising fees Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
1010 Dividend declared deducted from contributed surplus due to accumulated deficit Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
1011 Outstanding at end of year (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
1012 Balance at the end of the year Concept (Monetary) As Of Credit ifrs-full:Equity
1013 41201 - Disclosure - Reserves - Movements in reserves (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureReservesMovementsInReservesDetails
1014 Disclosure of reserves within equity [table] Table

*

*

 ifrs-full:DisclosureOfReservesWithinEquityTable
1015 Reserves within equity [axis] Axis ifrs-full:ReservesWithinEquityAxis
1016 Reserves Member ifrs-full:OtherReservesMember
1017 Hedging Member ifrs-full:ReserveOfCashFlowHedgesMember
1018 Employee Benefits Member ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlansMember
1019 Share-based compensation reserve Member ifrs-full:ReserveOfSharebasedPaymentsMember
1020 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
1021 Equity [member] Member ifrs-full:EquityMember
1022 Reserves Member ifrs-full:OtherReservesMember
1023 Hedging Member ifrs-full:ReserveOfCashFlowHedgesMember
1024 Employee Benefits Member ifrs-full:ReserveOfRemeasurementsOfDefinedBenefitPlansMember
1025 Share-based compensation reserve Member ifrs-full:ReserveOfSharebasedPaymentsMember
1026 Reserves LineItems ifrs-full:DisclosureOfReservesWithinEquityLineItems
1027 Balance at beginning of year Concept (Monetary) As Of Credit ifrs-full:Equity
1028 New Standards adjustment Concept (Monetary) As Of Credit glog:AdjustmentsDueToAdoptionOfIfrs15AndIfrs9
1029 Balance as of January 1, 2018 Concept (Monetary) As Of Credit glog:EquityAdjustedDueToAdoptionOfIfrs15AndIfrs9
1030 Effective portion of changes in fair value of cash flow hedges Concept (Monetary) For Period Credit glog:GainLossOnCashFlowHedgesNetOfTaxNetOfAmountsRecycledToProfitOrLossOnRealization
1031 Recycled loss of cash flow hedges reclassified to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedFutureCashFlowsAreNoLongerExpectedToOccurNetOfTax
1032 Share-based compensation, net of accrued dividend Concept (Monetary) For Period Credit glog:IncreaseDecreaseSharebasedCompensationNetOfAccruedDividend
1033 Settlement of share-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
1034 Actuarial loss Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans
1035 Balance at the end of the year Concept (Monetary) As Of Credit ifrs-full:Equity
1036 41202 - Disclosure - Reserves - Dividend distributions - (Details) Network

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 http://www.gaslogltd.com/role/DisclosureReservesDividendDistributionsDetails
1037 Disclosure Of Dividend Distributions [Table] Table

*

*

 glog:DisclosureOfDividendDistributionsTable
1038 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
1039 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
1040 Common shares/units Member ifrs-full:OrdinarySharesMember
1041 Preference shares/units Member ifrs-full:PreferenceSharesMember
1042 Dividend distributions LineItems glog:DividendDistributionsLineItems
1043 Dividend per share (in dollars per share) Concept (Share) For Period ifrs-full:DividendsRecognisedAsDistributionsToOwnersPerShare
1044 Dividend amount paid Concept (Monetary) For Period Debit ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParent
1045 41301 - Disclosure - Borrowings (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureBorrowingsDetails
1046 Implied Table Table

*

*

 implied:Table
1047 Borrowings Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
1048 Amounts due within one year Concept (Monetary) As Of Credit glog:CurrentBorrowingsAndCurrentPortionOfNonCurrentBorrowingsBeforeUnamortisedCosts
1049 Less: unamortized deferred loan/bond issuance costs Concept (Monetary) As Of Debit glog:CurrentPortionOfUnamortizedDeferredLoanIssuanceCosts
1050 Borrowings, current portion Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
1051 Amounts due after one year Concept (Monetary) As Of Credit glog:NonCurrentPortionOfNonCurrentBorrowings
1052 Less: unamortized deferred loan/bond issuance costs Concept (Monetary) As Of Debit glog:NonCurrentPortionOfUnamortizedDeferredLoanIssuanceCosts
1053 Borrowings, non-current portion Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
1054 Total Concept (Monetary) As Of Credit ifrs-full:Borrowings
1055 41302 - Disclosure - Borrowings - Terminated Facilities (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureBorrowingsTerminatedFacilitiesDetails
1056 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1057 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1058 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1059 Danish Ship Finance A/S loan Member glog:DanishShipFinanceSLoanMember
1060 DNB Bank ASA, UBS AG, National Bank of Greece S.A., Commonwealth Bank of Australia and Skandinaviska Enskilda Banken AB (publ) loan Member glog:DnbBankAsaUbsAgNationalBankOfGreeceS.a.CommonwealthBankOfAustraliaAndSkandinaviskaEnskildaBankenAbPublLoanMember
1061 Term loan facility Member glog:TermLoanFacilityMember
1062 Revolving credit facility Member glog:RevolvingCreditsFacilityMember
1063 Nordea Bank Finland PLC, ABN Amro Bank N.V. and Citibank International PLC syndicated loan Member glog:NordeaBankFinlandPlcAbnAmroBankN.v.AndCitibankInternationalPlcSyndicatedLoanMember
1064 Credit Suisse AG loan Member glog:CreditSuisseAgMember
1065 DnB Bank ASA, Commonwealth Bank of Australia, Danish Ship Finance A/S, ING Bank N.V. and Skandinaviska Enskilda Banken AB (publ) loan Member glog:DnbBankAsaCommonwealthBankOfAustraliaDanishShipFinanceSIngBankN.v.AndSkandinaviskaEnskildaBankenAbPublMember
1066 Citibank N.A., London Branch, Citibank International Plc. and DVB America N.V., term loan facility Member glog:CitibankN.a.LondonBranchCitibankInternationalPlc.AndDvbAmericaN.v.TermLoanFacilityMember
1067 Citibank, N.A. London Branch loan Member glog:CitibankN.A.LondonBranchMember
1068 ABN Amro Bank N.V., Commonwealth Bank of Australia, Credit Agricole Corporate and Investment Bank, Deutsche Bank AG Filiale Deutschlandgeschft and DNB Bank ASA, London Branch loan Member glog:AbnAmroBankN.v.CommonwealthBankOfAustraliaCreditAgricoleCorporateAndInvestmentBankDeutscheBankAgFilialeDeutschlandgeschftAndDnbBankAsaLondonBranchMember
1069 Senior secured term loan facility Member glog:SeniorSecuredTermLoanFacilityMember
1070 Subordinated term loan facility Member glog:SubordinatedTermLoanFacilityMember
1071 Range [axis] Axis ifrs-full:RangeAxis
1072 Ranges [member] Member ifrs-full:RangesMember
1073 Maximum Member ifrs-full:TopOfRangeMember
1074 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1075 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1076 GAS-one Ltd Member glog:GasOneLtdMember
1077 GAS-two Ltd Member glog:GasTwoLtdMember
1078 GAS-five Ltd. and GAS-six Ltd. Member glog:GasFiveLtd.AndGasSixLtdMember
1079 GAS-five Ltd Member glog:GasFiveLtdMember
1080 GAS-six Ltd Member glog:GasSixLtdMember
1081 GAS-seven Ltd Member glog:GasSevenLtdMember
1082 GAS-eight Ltd., GAS-nine Ltd. and GAS-ten Ltd Member glog:GasEightLtd.GasNineLtd.AndGasTenLtdMember
1083 GAS-eight Ltd Member glog:GasEightLtdMember
1084 GAS-nine Ltd Member glog:GasNineLtdMember
1085 GAS-ten Ltd Member glog:GasTenLtdMember
1086 GAS-fifteen Ltd Member glog:GasFifteenLtdMember
1087 GAS-eighteen Ltd Member glog:GasEighteenLtdMember
1088 GAS-sixteen Ltd., GAS-seventeen Ltd. and GAS-eighteen Ltd. Member glog:GasSixteenLtd.GasSeventeenLtd.AndGasEighteenLtd.Member
1089 GAS-sixteen Ltd. and GAS-seventeen Ltd. Member glog:GasSixteenLtd.AndGasSeventeenLtd.Member
1090 GAS-nineteen Ltd, GAS-twenty Ltd and GAS-twenty one Ltd Member glog:GasNineteenLtdGasTwentyLtdAndGasTwentyOneLtdMember
1091 GAS-nineteen Ltd Member glog:GasNineteenLtdMember
1092 GAS-twenty Ltd Member glog:GasTwentyLtdMember
1093 GAS-twenty one Ltd Member glog:GasTwentyOneLtdMember
1094 GAS-twenty six Ltd. and GAS-twenty seven Ltd Member glog:GasTwentySixLtd.AndGasTwentySevenLtdMember
1095 Legal Entity [Axis] Axis dei:LegalEntityAxis
1096 Entity [Domain] Member dei:EntityDomain
1097 GasLog Partners LP Member glog:GaslogPartnersLpMember
1098 Borrowings LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1099 Maximum loan facility amount Concept (Monetary) As Of Credit glog:IfrsLineOfCreditFacilityMaximumBorrowingCapacity
1100 Number of vessels on which the existing indebtedness is refinanced Concept (Integer) As Of glog:NumberOfVesselsOnWhichExistingIndebtednessIsRefinanced
1101 Maximum amount of refinancing of the outstanding debt Concept (Monetary) For Period Credit glog:RefinanceOfOutstandingDebt
1102 Bank loans and bond repayments Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
1103 Number of LNG vessels financed Concept (Integer) As Of glog:NumberOfLngVesselsAcquired
1104 Number of tranches in loan agreement Concept (Integer) As Of glog:NumberOfTranchesInLoanAgreement
1105 Prepayment of debt Concept (Monetary) For Period Credit glog:PrepaymentOfDebtInstrument
1106 Number of new building vessels financed Concept (Integer) As Of glog:NumberOfNewBuildingVesselsFinancing
1107 Drawn amount Concept (Monetary) For Period Debit glog:LineOfCreditFacilityDrawnAmount
1108 Amount transferred between lenders Concept (Monetary) For Period Credit glog:AmountTransferredBetweenLenders
1109 Facility term Concept (xbrli:durationItemType) For Period glog:TermOfDebtInstrument
1110 Number of entities acquired Concept (Integer) As Of glog:NumberOfEntitiesAcquired
1111 Debt assumed from acquired entities Concept (Monetary) As Of Credit ifrs-full:BorrowingsRecognisedAsOfAcquisitionDate
1112 41303 - Disclosure - Borrowings - Existing Facilities (Details) Network

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 http://www.gaslogltd.com/role/DisclosureBorrowingsExistingFacilitiesDetails
1113 Disclosure of detailed information about borrowings [table] Table

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*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1114 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1115 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1116 Citibank N.A., Nordea Bank Finland plc, London Branch, DVB Bank America N.V., ABN Amro Bank N.V., Skandinaviska Enskilda Banken AB and BNP Paribas loan Member glog:CitibankNordeaBankFinlandPlcLondonBranchDvbBankAmericaN.v.AbnAmroBankN.v.SkandinaviskaEnskildaBankenAbAndBnpParibasMember
1117 Citibank, N.A., London Branch, Nordea Bank AB, London Branch, The Export-Import Bank of Korea, Bank of America, National Association, BNP Paribas, Crdit Agricole Corporate and Investment Bank, Credit Suisse AG, HSBC Bank plc, ING Bank N.V., London Branch, KEB HANA Bank, London Branch, KfW IPEX-Bank GmbH, National Australia Bank Limited, Oversea-Chinese Banking Corporation Limited, Socit Gnrale and The Korea Development Bank loan Member glog:CitibankN.a.LondonBranchNordeaBankAbLondonBranchExportImportBankOfKoreaBankOfAmericaNationalAssociationBnpParibasMember
1118 Tranche 1 Member glog:LoanAgreementTranche1Member
1119 Tranche 2 Member glog:LoanAgreementTranche2Member
1120 Tranche 3 Member glog:LoanAgreementTranche3Member
1121 Tranche 4 Member glog:LoanAgreementTranche4Member
1122 ABN AMRO Bank N.V., DNB (UK) Ltd., DVB Bank America N.V., Commonwealth Bank of Australia, ING Bank N.V., London Branch, Credit Agricole Corporate and Investment Bank and National Australia Bank Limited loan (Five Vessel Refinancing) Member glog:AbnAmroBankN.v.DnbUkLtd.DvbBankAmericaN.v.CommonwealthBankOfAustraliaIngBankN.v.LondonBranchMember
1123 Five-year senior tranche facility Member glog:FiveYearSeniorTrancheFacilityMember
1124 Five-year senior tranche facility, first four advances Member glog:SeniorTrancheFacilityFirstFourAdvancesMember
1125 Senior tranche facility, fifth advance Member glog:SeniorTrancheFacilityFifthAdvanceMember
1126 Two-year bullet junior tranche facility Member glog:TwoYearBulletJuniorTrancheFacilityMember
1127 Two-year bullet junior tranche facility, first four advances Member glog:JuniorTrancheFacilityFirstFourAdvancesMember
1128 Two-year bullet Junior tranche facility, fifth advance Member glog:JuniorTrancheFacilityFifthAdvanceMember
1129 Citigroup Global Market Limited, Credit Suisse AG, Nordea Bank AB, London Branch, Skandinaviska Enskilda Banken AB (publ), HSBC Bank plc, ING Bank N.V., London Branch, Danmarks Skibskredit A/S, Korea Development Bank and DVB Bank America N.V. loan (Legacy Facility Refinancing) Member glog:CitigroupGlobalMarketLimitedCreditSuisseAgNordeaBankAbLondonBranchSkandinaviskaEnskildaBankenAbPublHsbcBankPlcIngBankN.v.LondonBranchMember
1130 Legacy Facility Refinancing Member glog:LegacyFacilityRefinancingMember
1131 Five-year term loan facility (Legacy Facility Refinancing) Member glog:FiveYearTermLoanFacilityMember
1132 Revolving credit facilities (Legacy Facility Refinancing) Member glog:RevolvingCreditFacilitiesMember
1133 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1134 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1135 GAS-three Ltd., GAS-four Ltd., GAS-five Ltd., GAS-sixteen Ltd., GAS-seventeen Ltd., GasLog Partners, GasLog Partners Holdings LLC Member glog:GasThreeLtd.GasFourLtd.GasFiveLtd.GasSixteenLtd.GasSeventeenLtd.GaslogPartnersGaslogPartnersHoldingsLlcMember
1136 GAS-eleven Ltd., GAS-twelve Ltd., GAS-thirteen Ltd., GAS-fourteen Ltd., GAS-twenty two Ltd., GAS-twenty three Ltd., GAS-twenty four Ltd. and GAS-twenty five Ltd. Member glog:GasElevenLtd.GasTwelveLtd.GasThirteenLtd.GasFourteenLtd.GasTwentyTwoLtd.GasTwentyThreeLtd.GasTwentyFourLtd.AndGasTwentyFiveLtd.Member
1137 GAS-eighteen Ltd., GAS- nineteen Ltd., GAS- twenty Ltd., GAS-twenty one Ltd., GAS-twenty seven Ltd. Member glog:GasEighteenLtd.GasNineteenLtd.GasTwentyLtd.GasTwentyOneLtd.AndGasTwentySevenLtd.Member
1138 GAS-eighteen Ltd Member glog:GasEighteenLtdMember
1139 GAS-nineteen Ltd Member glog:GasNineteenLtdMember
1140 GAS-twenty Ltd Member glog:GasTwentyLtdMember
1141 GAS-twenty one Ltd Member glog:GasTwentyOneLtdMember
1142 GAS-twenty seven Ltd Member glog:GasTwentySevenLtdMember
1143 GAS-one Ltd., GAS-two Ltd., GAS-six Ltd., GAS-seven Ltd., GAS-eight Ltd., GAS-nine Ltd., GAS-ten Ltd. and GAS-fifteen Ltd. Member glog:GasOneLtd.GasTwoLtd.GasSixLtd.GasSevenLtd.GasEightLtd.GasNineLtd.GasTenLtd.AndGasFifteenLtd.Member
1144 Legal Entity [Axis] Axis dei:LegalEntityAxis
1145 Entity [Domain] Member dei:EntityDomain
1146 GasLog Partners LP Member glog:GaslogPartnersLpMember
1147 Range [axis] Axis ifrs-full:RangeAxis
1148 Ranges [member] Member ifrs-full:RangesMember
1149 Maximum Member ifrs-full:TopOfRangeMember
1150 Borrowings LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1151 Maximum loan facility amount Concept (Monetary) As Of Credit glog:IfrsLineOfCreditFacilityMaximumBorrowingCapacity
1152 Outstanding balance Concept (Monetary) As Of Credit ifrs-full:Borrowings
1153 Number of equal quarterly installment of debt repayment Concept (Integer) As Of glog:NumberOfDebtRepayableEqualQuarterlyInstallments
1154 Installment amount Concept (Monetary) As Of Credit glog:PeriodicPaymentOfDebtInstrument
1155 Final balloon payment Concept (Monetary) As Of Credit glog:PeriodicPaymentOfDebtInstrumentInTermsBalloonPaymentToBePaid
1156 Number of international banks with debt financing agreement Concept (Integer) As Of glog:NumberOfInternationalBanksWithDebtFinancingAgreement
1157 Number of new buildings expected to be delivered Concept (Integer) As Of glog:NumberOfNewBuildingsExpectedToBeDelivered
1158 Export Import Bank of Korea ("KEXIM") and the Korea Trade Insurance Corporation ("K-Sure") coverage over facility Concept (Percent) For Period glog:ExportImportBankOfKoreakeximAndKoreaTradeInsuranceCorporationkSureCoverageOverFacility
1159 Number of tranches in loan agreement Concept (Integer) As Of glog:NumberOfTranchesInLoanAgreement
1160 Number of sub-divided loans in the facility Concept (Integer) As Of glog:NumberOfSubDividedLoansInFacility
1161 Number of equal semi-annual installments for debt repayment Concept (Integer) As Of glog:NumberOfDebtRepayableEqualSemiAnnualInstallments
1162 Commencement of first installment after delivery of newbuilding Concept (xbrli:durationItemType) For Period glog:CommencementOfFirstInstallmentAfterDeliveryOfNewbuilding
1163 Profile of debt instrument (in years) Concept (xbrli:durationItemType) For Period glog:BorrowingsTerm
1164 Drawn amount Concept (Monetary) For Period Debit glog:LineOfCreditFacilityDrawnAmount
1165 Number of entities with required minimum liquidity Concept (Integer) For Period glog:NumberOfEntitiesWithRequiredMinimumLiquidity
1166 Minimum liquidity required at all times Concept (Monetary) For Period Credit glog:MinimumLiquidityAtAllTimes
1167 Deferred financing costs Concept (Monetary) As Of Debit glog:DeferredFinanceCosts
1168 Refinance of outstanding debt Concept (Monetary) For Period Credit glog:RefinanceOfOutstandingDebt
1169 Balance debt paid from available cash Concept (Monetary) For Period Debit glog:BalanceDebtPaidFromAvailableCash
1170 Unamortized fees written off Concept (Monetary) For Period Debit glog:UnamortizedFeesWrittenOff
1171 Decrease in aggregate available amount Concept (Monetary) For Period Debit glog:DecreaseInAggregateAvailableAmount
1172 Commencement of first installment after drawdown Concept (xbrli:durationItemType) For Period glog:CommencementOfFirstInstallmentAfterDrawdown
1173 Advance repayable after drawdown Concept (xbrli:durationItemType) For Period glog:AdvanceRepayableAfterDrawdown
1174 Prepayment of debt instrument Concept (Monetary) For Period Credit glog:PrepaymentOfDebtInstrument
1175 Unamortized loan fees amortised Concept (Monetary) For Period Debit glog:UnamortizedLoanFeesAmortised
1176 Accelerated amortization Concept (Monetary) As Of Debit glog:AcceleratedAmortization
1177 Number of vessels on which the existing indebtedness is refinanced Concept (Integer) As Of glog:NumberOfVesselsOnWhichExistingIndebtednessIsRefinanced
1178 Number of legacy facilities refinanced Concept (Integer) For Period glog:NumberOfLegacyFacilitiesRefinanced
1179 Repayment of borrowings Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
1180 Available facility amount Concept (Monetary) As Of Credit ifrs-full:UndrawnBorrowingFacilities
1181 41304 - Disclosure - Borrowings - Securities covenants and guarantees, Bonds and Corporate guarantor financial covenants (Details) Network

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 http://www.gaslogltd.com/role/DisclosureBorrowingsSecuritiesCovenantsAndGuaranteesBondsAndCorporateGuarantorFinancialCovenantsDetails
1182 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1183 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1184 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1185 Citibank, N.A., London Branch, Nordea Bank AB, London Branch, The Export-Import Bank of Korea, Bank of America, National Association, BNP Paribas, Crdit Agricole Corporate and Investment Bank, Credit Suisse AG, HSBC Bank plc, ING Bank N.V., London Branch, KEB HANA Bank, London Branch, KfW IPEX-Bank GmbH, National Australia Bank Limited, Oversea-Chinese Banking Corporation Limited, Socit Gnrale and The Korea Development Bank loan Member glog:CitibankN.a.LondonBranchNordeaBankAbLondonBranchExportImportBankOfKoreaBankOfAmericaNationalAssociationBnpParibasMember
1186 NOK 2018 Bonds Member glog:SeniorUnsecuredBondMaturesIn2019Member
1187 NOK 2021 Bonds Member glog:SeniorUnsecuredBondMaturesIn2021Member
1188 8.875% Senior Notes Member glog:SeniorUnsecuredNotes8.875PercentMaturesIn2022Member
1189 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1190 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1191 NIBOR Member glog:NiborMember
1192 Legal Entity [Axis] Axis dei:LegalEntityAxis
1193 Entity [Domain] Member dei:EntityDomain
1194 GasLog Partners LP Member glog:GaslogPartnersLpMember
1195 Range [axis] Axis ifrs-full:RangeAxis
1196 Ranges [member] Member ifrs-full:RangesMember
1197 Maximum Member ifrs-full:TopOfRangeMember
1198 Borrowings LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1199 Minimum percentage that the aggregate fair market value of the vessels securing the facility to the aggregate amount outstanding under the facility Concept (Percent) For Period glog:MinimumPercentageThatAggregateFairMarketValueOfVesselsSecuringFacilityToAggregateAmountOutstandingUnderUnderFacility
1200 Issue of senior unsecured bond Concept (Monetary) As Of Credit ifrs-full:BondsIssued
1201 Premium on issuance Concept (Monetary) For Period Credit glog:PremiumOnIssueOfBond
1202 Repayment of borrowings Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
1203 Percentage of redemption price of par value Concept (Percent) For Period glog:RedemptionPricePercentageDebtInstrument
1204 Loss on redemption of bond Concept (Monetary) For Period Debit glog:LossOnRedemptionOfBond
1205 Unamortized fees written off Concept (Monetary) For Period Debit glog:UnamortizedFeesWrittenOff
1206 Outstanding balance Concept (Monetary) As Of Credit ifrs-full:Borrowings
1207 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
1208 Fair value of bond Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtFairValue
1209 Exchange rate Concept (Decimal) As Of ifrs-full:ClosingForeignExchangeRate
1210 Principal amount of notes issued Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
1211 Interest rate on borrowings Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1212 Percentage of original price for issued price Concept (Percent) For Period glog:OfferingPricePercentageOfOriginalPrincipalPrice
1213 Basis points for redemption price Concept (Percent) For Period glog:DebtInstrumentBasisSpreadOnOriginalPrincipalAmountRedemptionPrice
1214 Minimum percentage of unencumbered cash and cash equivalents to total indebtedness Concept (Percent) For Period glog:MinimumPercentageOfUnencumberedCashAndCashEquivalentsToTotalIndebtedness
1215 Minimum amount of unencumbered cash and cash equivalents Concept (Monetary) For Period Debit glog:MinimumAmountOfUnencumberedCashAndCashEquivalents
1216 Maximum percentage of total indebtedness to total assets Concept (Percent) For Period glog:MaximumPercentageOfTotalIndebtednessToTotalAssets
1217 Minimum percentage of EBITDA over debt service obligations on a trailing 12 months Concept (Percent) For Period glog:MinimumPercentageOfEbitdaOverDebtServiceObligations
1218 Minimum amount of net working capital (excluding the current portion of long-term debt) Concept (Monetary) For Period Debit glog:MinimumAmountOfNetWorkingCapitalExcludingCurrentPortionOfLongTermDebt
1219 Minimum percentage of unencumbered cash and cash equivalents to total indebtedness, to pay dividends Concept (Percent) For Period glog:MinimumPercentageOfUnencumberedCashAndCashEquivalentsToTotalIndebtednessToPayDividends
1220 Minimum market value adjusted net worth Concept (Monetary) For Period Credit glog:MinimumAdjustedNetWorthMarketValue
1221 Distributions per share Concept (Share) For Period ifrs-full:DividendsRecognisedAsDistributionsToOwnersPerShare
1222 41305 - Disclosure - Borrowings - Debt Repayment Schedule (Details) Network

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 http://www.gaslogltd.com/role/DisclosureBorrowingsDebtRepaymentScheduleDetails
1223 Disclosure of maturity analysis for non-derivative financial liabilities [table] Table

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*

 ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable
1224 Maturity [axis] Axis ifrs-full:MaturityAxis
1225 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1226 Not later than one year Member ifrs-full:NotLaterThanOneYearMember
1227 Later than one year and not later than three years Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1228 Later than three years and not later than five years Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
1229 More than five years Member ifrs-full:LaterThanFiveYearsMember
1230 Range [axis] Axis ifrs-full:RangeAxis
1231 Ranges [member] Member ifrs-full:RangesMember
1232 Average Member ifrs-full:WeightedAverageMember
1233 Borrowings Repayment Schedule / Total LineItems ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems
1234 Borrowings before unamortised costs Concept (Monetary) As Of Credit glog:BorrowingsBeforeUnamortisedCosts
1235 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1236 41401 - Disclosure - Other Payables and Accruals (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureOtherPayablesAndAccrualsDetails
1237 Implied Table Table

*

*

 implied:Table
1238 Other Payables and Accruals Abstract ifrs-full:MiscellaneousCurrentLiabilitiesAbstract
1239 Social contributions Concept (Monetary) As Of Credit ifrs-full:CurrentPayablesOnSocialSecurityAndTaxesOtherThanIncomeTax
1240 Unearned revenue Concept (Monetary) As Of Credit ifrs-full:CurrentAdvances
1241 Accrued legal and professional fees Concept (Monetary) As Of Credit glog:CurrentLegalAndProfessionalFees
1242 Accrued board of directors' fees Concept (Monetary) As Of Credit glog:CurrentBoardOfDirectorsFee
1243 Accrued employee costs Concept (Monetary) As Of Credit ifrs-full:ShorttermEmployeeBenefitsAccruals
1244 Accrued off-hire Concept (Monetary) As Of Credit glog:CurrentOffhirePayable
1245 Accrued crew costs Concept (Monetary) As Of Credit glog:CurrentCrewCost
1246 Accrued purchases Concept (Monetary) As Of Credit ifrs-full:CurrentPayablesForPurchaseOfNoncurrentAssets
1247 Accrued financing cost Concept (Monetary) As Of Credit glog:AccruedFinancingCost
1248 Accrued interest Concept (Monetary) As Of Credit ifrs-full:CurrentInterestPayable
1249 Accrued payable to charterers Concept (Monetary) As Of Credit glog:CurrentCharterersPayable
1250 Other accruals Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
1251 Total Concept (Monetary) As Of Credit ifrs-full:CurrentAccruedExpensesAndOtherCurrentLiabilities
1252 Unearned Revenue, Number of Vessels Concept (Decimal) As Of glog:UnearnedRevenueNumberOfVessels
1253 41501 - Disclosure - Vessel Operating and Supervision Costs (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureVesselOperatingAndSupervisionCostsDetails
1254 Implied Table Table

*

*

 implied:Table
1255 Vessel Operating and Supervision Costs Abstract glog:VesselOperatingAndSupervisionCostsAbstract
1256 Crew wages and vessel management employee costs Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
1257 Technical maintenance expenses Concept (Monetary) For Period Debit ifrs-full:RepairsAndMaintenanceExpense
1258 Other vessel operating expenses Concept (Monetary) For Period Debit ifrs-full:MiscellaneousOtherOperatingExpense
1259 Total Concept (Monetary) For Period Debit glog:VesselOperatingAndSupervisionCosts
1260 41601 - Disclosure - Voyage Expenses and Commissions (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureVoyageExpensesAndCommissionsDetails
1261 Implied Table Table

*

*

 implied:Table
1262 Voyage Expenses and Commissions Abstract glog:VoyageExpensesAndCommissionsAbstract
1263 Brokers' commissions on revenue Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
1264 Bunkers' consumption and other voyage expenses Concept (Monetary) For Period Debit glog:BunkersConsumptionAndOtherVoyageExpenses
1265 Total Concept (Monetary) For Period Debit glog:VoyageExpensesAndCommissions
1266 41602 - Disclosure - Voyage Expenses and Commissions Reclassification (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureVoyageExpensesAndCommissionsReclassificationDetails
1267 Disclosure of voluntary change in accounting policy [table] Table

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*

 ifrs-full:DisclosureOfVoluntaryChangeInAccountingPolicyTable
1268 Retrospective application and retrospective restatement [axis] Axis ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
1269 Currently stated [member] Member ifrs-full:RestatedMember
1270 Increase (decrease) due to reclassification Member ifrs-full:IncreaseDecreaseDueToVoluntaryChangesInAccountingPolicyMember
1271 Reclassification LineItems ifrs-full:DisclosureOfVoluntaryChangeInAccountingPolicyLineItems
1272 Voyage expenses and commissions Concept (Monetary) For Period Debit glog:VoyageExpensesAndCommissions
1273 41701 - Disclosure - General and Administrative Expenses (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureGeneralAndAdministrativeExpensesDetails
1274 Implied Table Table

*

*

 implied:Table
1275 General and Administrative Expenses Abstract glog:GeneralAndAdministrativeExpensesAbstract
1276 Employee costs Concept (Monetary) For Period Debit glog:EmployeeCostsInGeneralAndAdministrativeExpense
1277 Share-based compensation (Note 22) Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
1278 Other expenses Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
1279 Total Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
1280 41801 - Disclosure - Revenues from Contracts with Customers (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureRevenuesFromContractsWithCustomersDetails
1281 Disclosure of disaggregation of revenue from contracts with customers [table] Table

*

*

 ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable
1282 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
1283 Products and services [member] Member ifrs-full:ProductsAndServicesMember
1284 Time Charters Member glog:TimeChartersMember
1285 Cool Pool Services Member glog:CoolPoolServicesMember
1286 Vessel Management Services Member glog:VesselManagementServicesMember
1287 Revenues from Contracts with Customers LineItems ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
1288 Revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromContractsWithCustomers
1289 Net pool allocation Concept (Monetary) For Period Credit glog:NetPoolAllocation
1290 41901 - Disclosure - Financial Income and Costs (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureFinancialIncomeAndCostsDetails
1291 Implied Table Table

*

*

 implied:Table
1292 Financial Income and Costs Abstract glog:FinancialIncomeAndCostsAbstract
1293 Financial Income Abstract glog:FinancialIncomeAbstract
1294 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
1295 Total financial income Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
1296 Financial Costs Abstract glog:FinancialCostsAbstract
1297 Amortization and write-off of deferred loan/bond issuance costs and premium Concept (Monetary) For Period Debit glog:AmortizationAndWriteOffOfDeferredLoanOrBondIssuanceCostAndPremium
1298 Interest expense on loans and realized loss on cash flow hedges Concept (Monetary) For Period Debit glog:InterestExpenseOnLoansAndRealizedLossOnCashFlowHedges
1299 Interest expense on bonds and realized loss on CCSs Concept (Monetary) For Period Debit glog:InterestExpenseOnBondsAndRealizedLossOnCrossCurrencySwaps
1300 Finance lease charge Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnFinanceLeases
1301 Loss arising on NOK Bonds repurchase at a premium (Note 13) Concept (Monetary) For Period Debit glog:LossOnRedemptionOfBond
1302 Other financial costs Concept (Monetary) For Period Debit ifrs-full:OtherFinanceCost
1303 Total financial costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
1304 Unamortized deferred loan and bond issuance costs written off Concept (Monetary) For Period Debit glog:UnamortizedFeesWrittenOff
1305 42101 - Disclosure - Related Party Transactions - Receivables and Payables (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureRelatedPartyTransactionsReceivablesAndPayablesDetails
1306 Disclosure of transactions between related parties [table] Table

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*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1307 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1308 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1309 Related parties Member ifrs-full:RelatedPartiesMember
1310 Associates Member ifrs-full:AssociatesMember
1311 The Cool Pool Limited / Joint venture Member glog:CoolPoolLimitedMember
1312 IFRS Related Party Transaction [Axis] Axis glog:IfrsRelatedPartyTransactionAxis
1313 IFRS Related Party Transaction [Domain] Member glog:IfrsRelatedPartyTransactionDomain
1314 Dividends receivable Member glog:DividendsReceivableMember
1315 Accrued income receivable Member glog:IfrsAccruedIncomeReceivableMember
1316 Other receivables Member glog:OtherReceivablesMember
1317 Reimbursement of expenses incurred, for office lease, and other operating expenses Member glog:ReimbursementOfExpensesIncurredPlusOfficeLeaseAndOtherOperatingExpensesMember
1318 Related Party Transactions LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1319 Dividends receivable and other amounts due from related parties Abstract ifrs-full:OutstandingBalancesForRelatedPartyTransactionsAbstract
1320 Dividends receivable and other amounts due from related parties Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivablesDueFromRelatedParties
1321 Ship management creditors Concept (Monetary) As Of Credit glog:ShipManagementCreditors
1322 Amounts due to related parties Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToRelatedParties
1323 42102 - Disclosure - Related Party Transactions - Summary of Transactions (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureRelatedPartyTransactionsSummaryOfTransactionsDetails
1324 Disclosure of transactions between related parties [table] Table

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*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1325 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1326 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1327 Egypt LNG Shipping Ltd / Associate Member glog:EgyptLngShippingLtdMember
1328 Nea Dimitra Property Member glog:NeaDimitraPropertyMember
1329 Seres S.A. Member glog:SeresSaMember
1330 Chartwell Management Inc. Member glog:ChartwellManagementIncMember
1331 Ceres Monaco S.A.M. Member glog:CeresMonacoS.a.m.Member
1332 A.S. Papadimitriou and Partners Law Firm Member glog:SPapadimitriouAndPartnersLawFirmMember
1333 The Cool Pool Limited / Joint venture Member glog:CoolPoolLimitedMember
1334 Ceres Shipping Ltd Member glog:CeresShippingLtdMember
1335 IFRS Related Party Transaction [Axis] Axis glog:IfrsRelatedPartyTransactionAxis
1336 IFRS Related Party Transaction [Domain] Member glog:IfrsRelatedPartyTransactionDomain
1337 Vessel management services Member glog:RelatedPartyVesselManagementServicesMember
1338 Office rent and utilities Member glog:RelatedPartyOfficeRentAndUtilitiesMember
1339 Other office services Member glog:RelatedPartyOtherOfficeServicesMember
1340 Catering services Member glog:RelatedPartyCateringServicesMember
1341 Consultancy services Member glog:RelatedPartyConsultancyServicesMember
1342 Travel expenses Member glog:RelatedPartyTravelExpensesMember
1343 Professional services Member glog:RelatedPartyProfessionalServicesMember
1344 Adjustment for net pool allocation Member glog:RelatedPartyAdjustmentForNetPoolAllocationMember
1345 Related Party Transactions LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1346 Transactions Abstract ifrs-full:RelatedPartyTransactionsAbstract
1347 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
1348 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
1349 Net pool allocation Concept (Monetary) For Period Credit glog:NetPoolAllocation
1350 42103 - Disclosure - Related Party Transactions - General (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureRelatedPartyTransactionsGeneralDetails
1351 Disclosure of transactions between related parties [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1352 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1353 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1354 Egypt LNG Shipping Ltd / Associate Member glog:EgyptLngShippingLtdMember
1355 Seres S.A. Member glog:SeresSaMember
1356 Ceres Monaco S.A.M. Member glog:CeresMonacoS.a.m.Member
1357 A.S. Papadimitriou and Partners Law Firm Member glog:SPapadimitriouAndPartnersLawFirmMember
1358 The Cool Pool Limited / Joint venture Member glog:CoolPoolLimitedMember
1359 Related Party Transactions LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1360 Proportion of ownership interest in associate Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
1361 Maximum per person per day catering service rate Concept (Monetary) For Period Debit glog:MaximumPerPersonPerDayCateringServiceRate
1362 Consultancy agreement fixed fee for service of employees Concept (Monetary) For Period Debit glog:ConsultancyAgreementFixedFeeForServiceOfEmployees
1363 Consultancy arrangement fee per month Concept (Monetary) For Period Debit glog:ConsultancyArrangementFeePerMonth
1364 Consultancy arrangement minimum days per month Concept (xbrli:durationItemType) For Period glog:ConsultancyArrangementFeePayableForMinimumDaysPerMonth
1365 Services recognized in profit or loss Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
1366 Services capitalized Concept (Monetary) As Of Debit glog:ServicesReceivedRelatedPartyTransactionsCapitalized
1367 Net pool allocation Concept (Monetary) For Period Credit glog:NetPoolAllocation
1368 42104 - Disclosure - Related Party Transactions - Compensation of key management personnel (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureRelatedPartyTransactionsCompensationOfKeyManagementPersonnelDetails
1369 Disclosure of transactions between related parties [table] Table

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*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1370 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1371 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1372 Directors and key management Member ifrs-full:KeyManagementPersonnelOfEntityOrParentMember
1373 Related Party Transactions LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1374 Remuneration Concept (Monetary) For Period Debit glog:KeyManagementPersonnelCompensationRemuneration
1375 Short-term benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1376 Expense recognized in respect of share-based compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1377 Total Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1378 42201 - Disclosure - Share-Based Compensation - Omnibus Incentive Compensation Plan (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationOmnibusIncentiveCompensationPlanDetails
1379 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1380 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1381 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1382 The Plan Member glog:OmnibusIncentiveCompensationPlan2013Member
1383 RSUs Member glog:RestrictedStockUnitsMember
1384 SARs Member glog:StockAppreciationRightsOrStockOptionsMember
1385 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1386 Vesting period Concept (xbrli:durationItemType) For Period glog:VestingLifeOfShareBasedAwards
1387 Awards that vest on each anniversary (as a percent) Concept (Percent) For Period glog:AwardVestingPercentagePerYearShareBasedAwards
1388 Number of awards granted Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1389 Fair value at grant date Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1390 Number of awards granted Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1391 Exercise price Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
1392 Fair value at grant date Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
1393 Decrease in exercise price to reflect effect from distribution of special dividend Concept (Share) For Period glog:DecreaseInExercisePriceToReflectEffectFromDistributionOfSpecialDividend
1394 42202 - Disclosure - Share-Based Compensation - SARs fair value (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationSarsFairValueDetails
1395 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1396 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1397 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1398 The Plan Member glog:OmnibusIncentiveCompensationPlan2013Member
1399 SARs Member glog:StockAppreciationRightsOrStockOptionsMember
1400 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1401 Grant date share closing price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
1402 Exercise price Concept (Monetary) For Period ifrs-full:ExercisePriceShareOptionsGranted
1403 Expected volatility (as a percent) Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
1404 Expected term (Years) Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
1405 Risk-free interest rate for the period similar to the expected term Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
1406 Decrease in exercise price to reflect effect from distribution of special dividend Concept (Share) For Period glog:DecreaseInExercisePriceToReflectEffectFromDistributionOfSpecialDividend
1407 42203 - Disclosure - Share-Based Compensation - RSUs fair value (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationRsusFairValueDetails
1408 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1409 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1410 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1411 The Plan Member glog:OmnibusIncentiveCompensationPlan2013Member
1412 RSUs Member glog:RestrictedStockUnitsMember
1413 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1414 Grant date share closing price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePrice
1415 Risk-free interest rate for the period similar to the expected term Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
1416 Term until expiry Concept (xbrli:durationItemType) For Period glog:VestingLifeOfShareBasedAwards
1417 Fair value at grant date Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1418 42204 - Disclosure - Share-Based Compensation - RSUs movement (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationRsusMovementDetails
1419 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1420 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1421 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1422 The Plan Member glog:OmnibusIncentiveCompensationPlan2013Member
1423 RSUs Member glog:RestrictedStockUnitsMember
1424 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1425 Number of awards Abstract glog:NumberOfAwards
1426 Outstanding at the beginning of the year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1427 Granted during the year Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1428 Vested during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1429 Forfeited during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1430 Outstanding at end of the year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1431 Weighted average contractual life Abstract glog:WeightedAverageContractualLifeAbstract
1432 Weighted average contractual life Concept (xbrli:durationItemType) For Period glog:WeightedAverageRemainingContractualLifeOfShareBasedAwards
1433 Aggregate fair value Abstract glog:AggregateFairValueAbstract
1434 Outstanding at the beginning of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1435 Granted during the year Concept (Monetary) For Period Credit glog:AggregateFairValueOfAwardsGrantedInShareBasedPaymentArrangement
1436 Vested during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsVestedOrExercisedInShareBasedPaymentArrangement
1437 Forfeited during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsForfeitedInShareBasedPaymentArrangement
1438 Outstanding at the end of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1439 42205 - Disclosure - Share-Based Compensation - SARs movement (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationSarsMovementDetails
1440 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1441 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1442 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1443 The Plan Member glog:OmnibusIncentiveCompensationPlan2013Member
1444 SARs Member glog:StockAppreciationRightsOrStockOptionsMember
1445 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1446 Number of awards Abstract glog:NumberOfAwards
1447 Outstanding at beginning of the year Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1448 Granted during the year Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1449 Exercised during the year Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1450 Forfeited during the year Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
1451 Expired during the year Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExpiredInSharebasedPaymentArrangement
1452 Outstanding at end of the year Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1453 Vested but not been exercised Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1454 Weighted average exercise price per share Abstract glog:WeightedAverageExercisePriceAbstract
1455 Outstanding at the beginning of the year Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1456 Granted during the year Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
1457 Exercised during the year Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
1458 Forfeited during the year Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
1459 Expired during the year Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement
1460 Outstanding at end of the year Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1461 Weighted average share price at the date of exercise Abstract glog:WeightedAverageSharePriceAtDateOfExerciseAbstract
1462 Exercised during the year Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsInSharebasedPaymentArrangementExercisedDuringPeriodAtDateOfExercise
1463 Weighted average contractual life Abstract glog:WeightedAverageContractualLifeAbstract
1464 Weighted average contractual life Concept (xbrli:durationItemType) For Period glog:WeightedAverageRemainingContractualLifeOfShareBasedAwards
1465 Aggregate fair value Abstract glog:AggregateFairValueAbstract
1466 Outstanding at the beginning of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1467 Granted during the year Concept (Monetary) For Period Credit glog:AggregateFairValueOfAwardsGrantedInShareBasedPaymentArrangement
1468 Exercised during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsVestedOrExercisedInShareBasedPaymentArrangement
1469 Forfeited during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsForfeitedInShareBasedPaymentArrangement
1470 Expired during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsExpiredInShareBasedPaymentArrangement
1471 Outstanding at the end of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1472 42206 - Disclosure - Share-Based Compensation - GasLog Partners' Plan (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationGaslogPartnersPlanDetails
1473 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1474 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1475 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1476 GasLog Partners' Plan Member glog:GaslogPartners2015LongTermIncentivePlanMember
1477 RCUs Member glog:RestrictedCommonUnitsMember
1478 PCUs Member glog:PerformanceCommonUnitsMember
1479 Legal Entity [Axis] Axis dei:LegalEntityAxis
1480 Entity [Domain] Member dei:EntityDomain
1481 GasLog Partners LP Member glog:GaslogPartnersLpMember
1482 Performance Awards Benchmark [Axis] Axis glog:PerformanceAwardsBenchmarkAxis
1483 Performance Awards Benchmark [Member] Member glog:PerformanceAwardsBenchmarkMember
1484 TUR above 75th Percentile of peer group Member glog:TotalUnitholderReturnAchievedAbove75thPercentileOfPeerGroupMember
1485 TUR Between 50th and 75th percentile of peer group Member glog:TotalUnitholderReturnAchievedBetween50thTo75thPercentileOfPeerGroupMember
1486 TUR Below the 50th percentile of peer group Member glog:TotalUnitholderReturnAchievedBelow50thPercentileOfPeerGroupMember
1487 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1488 Vesting period Concept (xbrli:durationItemType) For Period glog:VestingLifeOfShareBasedAwards
1489 Vesting percentage of awards Concept (Percent) For Period glog:VestingPercentageOnBenchmarkedAchievementInShareBasedPaymentArrangement
1490 Number of awards granted Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1491 Fair value at grant date Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1492 42207 - Disclosure - Share-Based Compensation - RCUs and PCUs fair value (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationRcusAndPcusFairValueDetails
1493 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1494 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1495 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1496 GasLog Partners' Plan Member glog:GaslogPartners2015LongTermIncentivePlanMember
1497 Legal Entity [Axis] Axis dei:LegalEntityAxis
1498 Entity [Domain] Member dei:EntityDomain
1499 GasLog Partners LP Member glog:GaslogPartnersLpMember
1500 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1501 Grant date share closing price Concept (Monetary) For Period ifrs-full:WeightedAverageSharePrice
1502 42208 - Disclosure - Share-Based Compensation - RCUs movement (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationRcusMovementDetails
1503 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1504 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1505 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1506 GasLog Partners' Plan Member glog:GaslogPartners2015LongTermIncentivePlanMember
1507 RCUs Member glog:RestrictedCommonUnitsMember
1508 Legal Entity [Axis] Axis dei:LegalEntityAxis
1509 Entity [Domain] Member dei:EntityDomain
1510 GasLog Partners LP Member glog:GaslogPartnersLpMember
1511 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1512 Number of awards Abstract glog:NumberOfAwards
1513 Outstanding at the beginning of the year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1514 Granted during the year Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1515 Forfeited during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1516 Vested during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1517 Outstanding at end of the year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1518 Weighted average contractual life Abstract glog:WeightedAverageContractualLifeAbstract
1519 Weighted average contractual life Concept (xbrli:durationItemType) For Period glog:WeightedAverageRemainingContractualLifeOfShareBasedAwards
1520 Aggregate fair value Abstract glog:AggregateFairValueAbstract
1521 Outstanding at the beginning of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1522 Granted during the year Concept (Monetary) For Period Credit glog:AggregateFairValueOfAwardsGrantedInShareBasedPaymentArrangement
1523 Forfeited during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsForfeitedInShareBasedPaymentArrangement
1524 Vested during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsVestedOrExercisedInShareBasedPaymentArrangement
1525 Outstanding at the end of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1526 42209 - Disclosure - Share-Based Compensation - PCUs movement (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationPcusMovementDetails
1527 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1528 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1529 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1530 GasLog Partners' Plan Member glog:GaslogPartners2015LongTermIncentivePlanMember
1531 PCUs Member glog:PerformanceCommonUnitsMember
1532 Legal Entity [Axis] Axis dei:LegalEntityAxis
1533 Entity [Domain] Member dei:EntityDomain
1534 GasLog Partners LP Member glog:GaslogPartnersLpMember
1535 Share-Based Compensation LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1536 Number of awards Abstract glog:NumberOfAwards
1537 Outstanding at the beginning of the year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1538 Granted during the year Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1539 Forfeited during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1540 Vested during the year Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1541 Outstanding at end of the year Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1542 Weighted average contractual life Abstract glog:WeightedAverageContractualLifeAbstract
1543 Weighted average contractual life Concept (xbrli:durationItemType) For Period glog:WeightedAverageRemainingContractualLifeOfShareBasedAwards
1544 Aggregate fair value Abstract glog:AggregateFairValueAbstract
1545 Outstanding at the beginning of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1546 Granted during the year Concept (Monetary) For Period Credit glog:AggregateFairValueOfAwardsGrantedInShareBasedPaymentArrangement
1547 Forfeited during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsForfeitedInShareBasedPaymentArrangement
1548 Vested during the year Concept (Monetary) For Period Debit glog:AggregateFairValueOfAwardsVestedOrExercisedInShareBasedPaymentArrangement
1549 Outstanding at the end of the year Concept (Monetary) As Of Credit glog:AggregateFairValueOfAwardsOutstandingInShareBasedPaymentArrangement
1550 42210 - Disclosure - Share-Based Compensation - Expense and liability (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureShareBasedCompensationExpenseAndLiabilityDetails
1551 Implied Table Table

*

*

 implied:Table
1552 Share-Based Compensation Abstract ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementAbstract
1553 Total expense recognized Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1554 Total accrued cash distribution Concept (Monetary) As Of Credit ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
1555 42301 - Disclosure - Commitments - Operating Lease Commitments (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureCommitmentsOperatingLeaseCommitmentsDetails
1556 Disclosure of finance lease and operating lease by lessee [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable
1557 Maturity [axis] Axis ifrs-full:MaturityAxis
1558 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1559 Not later than one year Member ifrs-full:NotLaterThanOneYearMember
1560 Later than one year and not later than three years Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1561 Later than three years and not later than five years Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
1562 More than five years Member ifrs-full:LaterThanFiveYearsMember
1563 Commitments as lessee relating to buildings under operating leases LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems
1564 Operating lease commitment Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1565 Rental expense relating to operating leases Concept (Monetary) For Period Debit ifrs-full:MinimumOperatingLeasePayments
1566 42302 - Disclosure - Commitments - Related to vessels under construction and reliquefaction (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureCommitmentsRelatedToVesselsUnderConstructionAndReliquefactionDetails
1567 Disclosure of transactions between related parties [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1568 Commitment By Category Or Type Of Item Purchased [Axis] Axis glog:PurchaseCommitmentByCategoryOfItemPurchasedAxis
1569 Purchase Commitment Category [Member] Member glog:PurchaseCommitmentCategoryMember
1570 ALAT reliquefaction Member glog:AlatReliquefactionMember
1571 Newbuildings and/or modifications to existing vessels Member glog:NewbuildingsOrModificationsToVesselsMember
1572 Maturity [axis] Axis ifrs-full:MaturityAxis
1573 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1574 Not later than one year Member ifrs-full:NotLaterThanOneYearMember
1575 Later than one year and not later than three years Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1576 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
1577 Counterparties [member] Member ifrs-full:CounterpartiesMember
1578 Ship building contracts with Samsung Member glog:SamsungMember
1579 MSL Member glog:MethaneServicesLimitedMember
1580 Legal Entity [Axis] Axis dei:LegalEntityAxis
1581 Entity [Domain] Member dei:EntityDomain
1582 GAS-twenty two Ltd. and GAS-twenty three Ltd. Member glog:GasTwentyTwoLtdAndGasTwentyThreeLtdMember
1583 GAS-twenty two Ltd. Member glog:GSTwentyTwoLtdMember
1584 Range [axis] Axis ifrs-full:RangeAxis
1585 Ranges [member] Member ifrs-full:RangesMember
1586 Maximum Member ifrs-full:TopOfRangeMember
1587 Commitments LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1588 Capital commitment Concept (Monetary) As Of Credit ifrs-full:ContractualCapitalCommitments
1589 Amount to be reimbursed for installation of reliquefaction plants on vessels, as a percent Concept (Percent) For Period glog:InstallationReliquefactionPlantsOnVesselsReimbursementPercent
1590 Aggregate commitment to be reimbursed per vessel Concept (Monetary) As Of Debit glog:InstallationReliquefactionPlantsOnVesselsAggregateReimbursementAmountPerVessel
1591 Tangible fixed assets Concept (Monetary) As Of Debit glog:TangibleFixedAssets
1592 Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1593 42303 - Disclosure - Commitments - Revenues From Non-cancellable Charter Agreements (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureCommitmentsRevenuesFromNonCancellableCharterAgreementsDetails
1594 Disclosure of finance lease and operating lease by lessor [table] Table

*

*

 ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable
1595 Maturity [axis] Axis ifrs-full:MaturityAxis
1596 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1597 Not later than one year Member ifrs-full:NotLaterThanOneYearMember
1598 Later than one year and not later than three years Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1599 Later than three years and not later than five years Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
1600 More than five years Member ifrs-full:LaterThanFiveYearsMember
1601 Legal Entity [Axis] Axis dei:LegalEntityAxis
1602 Entity [Domain] Member dei:EntityDomain
1603 GAS-twenty three Ltd Member glog:GasTwentyThreeLtdMember
1604 GAS-twenty eight Ltd Member glog:GasTwentyEightLtdMember
1605 GAS-thirty Ltd Member glog:GasThirtyLtdMember
1606 GAS-thirty two Ltd Member glog:GasThirtyTwoLtdMember
1607 GAS-thirty three Ltd Member glog:GasThirtyThreeLtdMember
1608 GAS-thirty four Ltd Member glog:GasThirtyFourLtdMember
1609 GAS-thirty five Ltd Member glog:GasThirtyFiveLtdMember
1610 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
1611 Counterparties [member] Member ifrs-full:CounterpartiesMember
1612 Subsidiary of Shell Member glog:SubsidiaryOfRoyalDutchShellMember
1613 Wholly owned subsidiary of Centrica Member glog:WhollyOwnedSubsidiaryOfCentricaMember
1614 Pioneer Shipping Limited Member glog:PioneerShippingLimitedMember
1615 Wholly owned subsidiary of Cheniere Energy Member glog:WhollyOwnedSubsidiaryOfCheniereEnergyMember
1616 Cheniere Member glog:CheniereEnergyIncMember
1617 Time Charter Agreements LineItems ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems
1618 Number of assumed off-hire days when each vessel will undergo scheduled dry-docking Concept (xbrli:durationItemType) For Period glog:NumberOfOffHireDaysAssumedInTimeCharterAgreement
1619 Future gross minimum lease revenues receivable in relation to non-cancellable time charter agreements Concept (Monetary) As Of Debit ifrs-full:MinimumLeasePaymentsReceivableUnderNoncancellableOperatingLease
1620 Time Charter Agreement Duration Concept (xbrli:durationItemType) For Period glog:TimeCharterAgreementDuration
1621 42304 - Disclosure - Commitments - Other commitments and guarantees (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureCommitmentsOtherCommitmentsAndGuaranteesDetails
1622 Commitments And Guarantees [Table] Table

*

*

 glog:CommitmentsAndGuaranteesTable
1623 Commitment By Category Or Type Of Item Purchased [Axis] Axis glog:PurchaseCommitmentByCategoryOfItemPurchasedAxis
1624 Purchase Commitment Category [Member] Member glog:PurchaseCommitmentCategoryMember
1625 Enhancement of operational performance Member glog:EnhancementOfOperationalPerformanceMember
1626 Purchase of depot spares Member glog:PurchaseOfDepotSparesMember
1627 Engineering in relation to FSRU conversion Member glog:EngineeringInRelationToFsruConversionMember
1628 Legal Entity [Axis] Axis dei:LegalEntityAxis
1629 Entity [Domain] Member dei:EntityDomain
1630 GasLog LNG Services Ltd. Member glog:GasLogLngServicesLtdMember
1631 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
1632 Counterparties [member] Member ifrs-full:CounterpartiesMember
1633 MSL Member glog:MethaneServicesLimitedMember
1634 Keppel Shipyard Limited Member glog:KeppelShipyardLimitedMember
1635 Wartsila Member glog:WartsilaGreeceS.a.Member
1636 Third Parties Member ifrs-full:IndividuallyInsignificantCounterpartiesMember
1637 Greek Ministry Of Finance Member glog:GreekMinistryOfFinanceMember
1638 Range [axis] Axis ifrs-full:RangeAxis
1639 Ranges [member] Member ifrs-full:RangesMember
1640 Maximum Member ifrs-full:TopOfRangeMember
1641 Maturity [axis] Axis ifrs-full:MaturityAxis
1642 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1643 Not later than one year Member ifrs-full:NotLaterThanOneYearMember
1644 Later than one year and not later than three years Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1645 Commitments LineItems glog:CommitmentsAndGuaranteesLineItems
1646 Number of vessels acquired Concept (Decimal) For Period glog:NumberOfVesselsAcquired
1647 Capital commitment Concept (Monetary) As Of Credit ifrs-full:ContractualCapitalCommitments
1648 Depot spares purchased and paid Concept (Monetary) As Of Debit ifrs-full:SpareParts
1649 Threshold period after which if LLI has not been utilized in a vessel conversion for items will be charged at a percentage of the original cost, in years Concept (xbrli:durationItemType) For Period glog:LongLeadItemsPeriodForChargedAtPercentageOfOriginalCost
1650 LLI cost, expressed as a percentage of original cost Concept (Percent) For Period glog:LongLeadItemsCostPercentageOfOriginalCost
1651 LLI discounted purchase price, expressed as a percentage of the original cost Concept (Percent) For Period glog:LongLeadItemsPurchasePriceDiscountedPercentageOfOriginalCost
1652 Number of existing maintenance agreements related to vessels Concept (Integer) For Period glog:NumberOfMaintenanceAgreementsRelatedToVessels
1653 Number of maintenance agreements related to carriers Concept (Integer) For Period glog:NumberOfMaintenanceAgreementsRelatedToCarriers
1654 Number of maintenance agreements related to vessels, renewed Concept (Integer) For Period glog:NumberOfMaintenanceAgreementsRelatedToVesselsRenewed
1655 Number of service agreements related to carriers, additional Concept (Integer) For Period glog:NumberOfServiceAgreementsRelatedToCarriers
1656 Bank guarantee amount Concept (Monetary) As Of Credit glog:BankGuaranteeAmount
1657 42401 - Disclosure - Financial Risk Management - Interest Rate Risk and Currency Risk (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureFinancialRiskManagementInterestRateRiskAndCurrencyRiskDetails
1658 Disclosure of nature and extent of risks arising from financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
1659 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1660 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1661 Interest rate swaps Member ifrs-full:InterestRateSwapContractMember
1662 Interest rate and cross currency swaps Member ifrs-full:SwapContractMember
1663 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1664 Risks [member] Member ifrs-full:TypesOfRisksMember
1665 Interest rate risk Member ifrs-full:InterestRateRiskMember
1666 Currency risk Member ifrs-full:CurrencyRiskMember
1667 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1668 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1669 Floating interest rate Member ifrs-full:FloatingInterestRateMember
1670 Currency [Axis] Axis srt:CurrencyAxis
1671 All Currencies [Domain] Member currency:AllCurrenciesDomain
1672 EUR Member currency:EUR
1673 Financial Risk Management LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
1674 Percent of variable interest rate exposure hedged Concept (Percent) As Of glog:VariableInterestRateExposureHedgedPercent
1675 Aggregate principal amount of floating rate debt outstanding Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilitiesAtAmortisedCost
1676 Interest rate basis Concept (Text/String) For Period ifrs-full:BorrowingsInterestRateBasis
1677 Sensitivity analysis, increase (decrease) in interest rate Concept (Percent) As Of glog:InterestRateSensitivityIncreaseDecrease
1678 Increase in interest expense on un-hedged portion of loans Concept (Monetary) For Period Debit glog:InterestRateRiskEffectOnInterestExpenseForLoansNotHedgedIncreaseDecrease
1679 Fair value of interest rate swaps / net asset Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
1680 Effective portion of changes in fair value of cash flow hedges Concept (Monetary) For Period Credit glog:GainLossOnCashFlowHedgesNetOfTaxNetOfAmountsRecycledToProfitOrLossOnRealization
1681 Increase in fair value due to reasonably possible increase in interest rates Concept (Monetary) As Of Debit glog:IncreaseDecreaseInFairValueDueToReasonablyPossibleIncreaseInInterestRates
1682 Operating and administrative expenses denominated in euros Concept (Monetary) For Period Debit glog:OperatingAndAdministrativeExpenses
1683 Trade payables and accruals denominated in euros Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayables
1684 Sensitivity analysis, increase in EUR/USD exchange rate Concept (Percent) As Of glog:ExchangeRateRiskSensitivityIncreaseDecrease
1685 Increase (decrease) in profit and cash flows Concept (Monetary) For Period Credit glog:IncreaseDecreaseInProfitAndCashFlows
1686 42402 - Disclosure - Financial Risk Management - Liquidity Risk (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureFinancialRiskManagementLiquidityRiskDetails
1687 Disclosure of nature and extent of risks arising from financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
1688 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1689 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1690 Interest rate swaps Member ifrs-full:InterestRateSwapContractMember
1691 Cross currency swaps Member ifrs-full:CurrencySwapContractMember
1692 Forward foreign exchange contracts Member ifrs-full:ForwardContractMember
1693 Classes of financial liabilities [axis] Axis ifrs-full:ClassesOfFinancialLiabilitiesAxis
1694 Financial liabilities, class [member] Member ifrs-full:FinancialLiabilitiesMember
1695 Trade and other accounts payable Member glog:TradeAndOtherAccountsPayableMember
1696 Amounts due to related parties Member glog:AmountsDueToRelatedPartiesMember
1697 Other payables and accruals Member glog:OtherPayablesAndAccrualsMember
1698 Other non-current liabilities Member glog:OtherNonCurrentLiabilityMember
1699 Loans Member glog:LoansReceivedMember
1700 Bonds Member glog:BondsIssuedMember
1701 Finance lease liability Member ifrs-full:LeaseLiabilitiesMember
1702 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1703 Risks [member] Member ifrs-full:TypesOfRisksMember
1704 Liquidity risk Member ifrs-full:LiquidityRiskMember
1705 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1706 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1707 Floating interest rate Member ifrs-full:FloatingInterestRateMember
1708 Maturity [axis] Axis ifrs-full:MaturityAxis
1709 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1710 Less than 1 month Member ifrs-full:NotLaterThanOneMonthMember
1711 1 - 3 months Member ifrs-full:LaterThanOneMonthAndNotLaterThanThreeMonthsMember
1712 3 - 12 months Member ifrs-full:LaterThanThreeMonthsAndNotLaterThanOneYearMember
1713 1 - 5 years Member ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
1714 More than five years Member ifrs-full:LaterThanFiveYearsMember
1715 Financial Risk Management LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
1716 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1717 Non-derivative financial liabilities, undiscounted cash flows Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
1718 Derivative financial instruments, undiscounted cash flows Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilitiesUndiscountedCashFlows
1719 42403 - Disclosure - Financial Risk Management - Credit Risk (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureFinancialRiskManagementCreditRiskDetails
1720 Disclosure of nature and extent of risks arising from financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable
1721 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1722 Risks [member] Member ifrs-full:TypesOfRisksMember
1723 Credit risk Member ifrs-full:CreditRiskMember
1724 Major customers [axis] Axis ifrs-full:MajorCustomersAxis
1725 Customers [member] Member ifrs-full:MajorCustomersMember
1726 Shell Member glog:RoyalDutchShellPLCMember
1727 Financial Risk Management LineItems ifrs-full:DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
1728 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1729 Short-term investments Concept (Monetary) As Of Debit ifrs-full:CurrentInvestments
1730 Trade and other receivables Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
1731 Dividends receivable and other amounts due from related parties Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivablesDueFromRelatedParties
1732 Derivative financial assets Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
1733 Percentage of revenue Concept (Percent) For Period ifrs-full:PercentageOfEntitysRevenue
1734 42501 - Disclosure - Capital Risk Management (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureCapitalRiskManagementDetails
1735 Implied Table Table

*

*

 implied:Table
1736 Capital Risk Management Abstract glog:CapitalRiskManagementAbstract
1737 Borrowings, current portion Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
1738 Borrowings, non-current portion Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
1739 Finance lease liability, current portion Concept (Monetary) As Of Credit ifrs-full:CurrentFinanceLeaseLiabilities
1740 Finance lease liability, non-current portion Concept (Monetary) As Of Credit ifrs-full:NoncurrentFinanceLeaseLiabilities
1741 Total debt Concept (Monetary) As Of Credit glog:Debt
1742 Total equity Concept (Monetary) As Of Credit ifrs-full:Equity
1743 Total debt and equity Concept (Monetary) As Of Credit glog:DebtAndEquity
1744 Gearing ratio Concept (Percent) As Of glog:GearingRatio
1745 42601 - Disclosure - Derivative Financial Instruments - Fair value of the derivative assets and liabilities (Details) Network

*

*

 http://www.gaslogltd.com/role/DisclosureDerivativeFinancialInstrumentsFairValueOfDerivativeAssetsAndLiabilitiesDetails
1746 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
1747 Categories of financial assets [axis] Axis ifrs-full:CategoriesOfFinancialAssetsAxis
1748 Financial assets, category [member] Member ifrs-full:FinancialAssetsCategoryMember
1749 Financial assets designated and effective as hedging instruments carried at fair value Member glog:FinancialAssetsAtFairValueDesignatedAndEffectiveAsHedgingInstrumentsMember
1750 Financial assets carried at fair value through profit or loss (FVTPL) Member ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1751 Categories of financial liabilities [axis] Axis ifrs-full:CategoriesOfFinancialLiabilitiesAxis
1752 Financial liabilities, category [member] Member ifrs-full:FinancialLiabilitiesCategoryMember
1753 Financial liabilities designated and effective as hedging instruments carried at fair value Member glog:FinancialLiabilitiesAtFairValueDesignatedAndEffectiveAsHedgingInstrumentsMember
1754 Financial liabilities carried at fair value through profit or loss (FVTPL) Member ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
1755 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1756 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1757 Interest rate swaps Member ifrs-full:InterestRateSwapContractMember
1758 Forward foreign exchange contracts Member ifrs-full:ForwardContractMember
1759 Cross currency swaps Member ifrs-full:CurrencySwapContractMember
1760 Financial Instruments LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1761 Derivative financial instruments, current assets Concept (Monetary) As Of Debit ifrs-full:CurrentDerivativeFinancialAssets
1762 Derivative financial instruments, non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
1763 Total Concept (Monetary) As Of Debit ifrs-full:DerivativeFinancialAssets
1764 Derivative financial instruments, current liability Concept (Monetary) As Of Credit ifrs-full:CurrentDerivativeFinancialLiabilities
1765 Derivative financial instruments, non-current liability Concept (Monetary) As Of Credit ifrs-full:NoncurrentDerivativeFinancialLiabilities
1766 Total Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
1767 42602 - Disclosure - Derivative Financial Instruments - Interest rate swaps designated as cash flow hedging instruments (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureDerivativeFinancialInstrumentsInterestRateSwapsDesignatedAsCashFlowHedgingInstrumentsDetails
1768 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
1769 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
1770 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
1771 Interest rate swaps designated as cash flow hedging instruments Member glog:InterestRateSwapsDesignatedAsCashFlowHedgingInstrumentsMember
1772 Interest rate swaps LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
1773 Legacy facilities Concept (Integer) As Of glog:NumberOfLegacyFacilities
1774 Recycled loss of cash flow hedges reclassified to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedFutureCashFlowsAreNoLongerExpectedToOccurNetOfTax
1775 Number of derivative financial instruments Concept (Integer) As Of glog:NumberOfDerivativeFinancialInstruments
1776 Effective portion of changes in fair value of cash flow hedges Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesNetOfTax
1777 Recycled loss of cash flow hedges reclassified to profit or loss on realization of expense Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedItemAffectedProfitOrLossNetOfTax
1778 42603 - Disclosure - Derivative Financial Instruments - Interest rate swaps held for trading (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureDerivativeFinancialInstrumentsInterestRateSwapsHeldForTradingDetails
1779 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
1780 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1781 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1782 Interest rate swaps held for trading Member glog:InterestRateSwapsHeldForTradingMember
1783 GasLog with counterparty Deutsche Bank AG, termination in July 2020 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDeutscheBankAgTerminationInJuly2020Member
1784 GasLog with counterparty Deutsche Bank AG, termination in July 2021 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDeutscheBankAgTerminationInJuly2021Member
1785 GasLog with counterparty Deutsche Bank AG, termination in July 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDeutscheBankAgTerminationInJuly2022Member
1786 GasLog with counterparty DNB Bank ASA, termination in July 2020 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDnbBankAsaTerminationInJuly2020Member
1787 GasLog with counterparty DNB Bank ASA, termination in July 2021 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDnbBankAsaTerminationInJuly2021Member
1788 GasLog with counterparty DNB Bank ASA, termination in July 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDnbBankAsaTerminationInJuly2022Member
1789 GasLog with counterparty HSBC Bank, plc, termination in July 2020 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyHsbcBankPlcTerminationInJuly2020Member
1790 GasLog with counterparty HSBC Bank, plc, termination in July 2021 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyHsbcBankPlcTerminationInJuly2021Member
1791 GasLog with counterparty HSBC Bank, plc, termination in July 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyHsbcBankPlcTerminationInJuly2022Member
1792 GasLog with counterparty Nordea Bank Finland, termination in July 2020 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyNordeaBankFinlandTerminationInJuly2020Member
1793 GasLog with counterparty Nordea Bank Finland, termination in July 2021 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyNordeaBankFinlandTerminationInJuly2021Member
1794 GasLog with counterparty Nordea Bank Finland, termination in July 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyNordeaBankFinlandTerminationInJuly2022Member
1795 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), termination in July 2020 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublSebTerminationInJuly2020Member
1796 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), termination in July 2021 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublSebTerminationInJuly2021Member
1797 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), termination in July 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublSebTerminationInJuly2022Member
1798 GasLog with counterparty HSBC Bank plc, termination in February 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyHsbcBankPlcTerminationInFebruary2022Member
1799 GasLog with counterparty Nordea Bank Finland, termination in March 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyNordeaBankFinlandTerminationInMarch2022Member
1800 GasLog with counterparty ABN Amro Bank NV ("ABN"), termination in March 2022 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyAbnAmroBankNvTerminationInMarch2022Member
1801 GasLog with counterparty Nordea Bank Finland, termination in July 2026, Interest rate of 3.070 percent Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyNordeaBankFinlandTerminationInJuly2026WithInterestRateOf3.070PercentMember
1802 GasLog with counterparty Nordea Bank Finland, termination in July 2026, Interest rate of 2.562 percent Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyNordeaBankFinlandTerminationInJuly2026Member
1803 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), termination in July 2024, interest rate of 3.025 percent Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublSebTerminationInJuly2024Member
1804 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), termination in July 2025 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublSebTerminationInJuly2025Member
1805 GasLog with counterparty DNB Bank ASA, termination in July 2024 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDnbBankAsaTerminationInJuly2024Member
1806 GasLog with counterparty DNB Bank ASA, termination in July 2025, interest rate of 2.472 percent Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyDnbBankAsaTerminationInJuly2025Member
1807 GasLog with counterparty HSBC Bank, plc, termination in July 2024 and July 2025 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyHsbcBankPlcTerminationInJuly2024AndJuly2025Member
1808 GasLog with counterparty HSBC Bank, plc, termination in July 2024 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyHsbcBankPlcTerminationInJuly2024Member
1809 GasLog with counterparty HSBC Bank, plc, termination in July 2025 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyHsbcBankPlcTerminationInJuly2025Member
1810 GasLog with counterparty Citibank Europe Plc, termination in July 2024 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyCitibankEuropePlcTerminationInJuly2024Member
1811 GasLog with counterparty Citibank Europe Plc, termination in July 2025 Member glog:InterestRateSwapsHeldForTradingInGaslogWithCounterpartyCitibankEuropePlcTerminationInJuly2025Member
1812 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), termination in July 2026 Member glog:GaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublsebTerminationInJuly2026Member
1813 GasLog with counterparty Nordea Bank Finland, termination in July 2028 Member glog:GaslogWithCounterpartyNordeaBankFinlandTerminationInJuly2028Member
1814 GasLog with counterparty DNB Bank ASA, termination in July 2025, interest rate of 2.685 percent Member glog:GaslogWithCounterpartyDnbBankAsaTerminationInJuly2025InterestRateOf2.685PercentMember
1815 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), termination in July 2024, interest rate of 2.9575 percent Member glog:GaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublsebTerminationInJuly2024InterestRateOf2.9575PercentMember
1816 GasLog with counterparty Nordea Bank Finland, termination in July 2024 Member glog:GaslogWithCounterpartyNordeaBankFinlandTerminationInJuly2024Member
1817 GasLog with counterparty DNB Bank ASA, termination in April 2025 Member glog:GaslogWithCounterpartyDnbBankAsaTerminationInApril2025Member
1818 Interest rate swaps, maturing between 2024 and 2026 Member glog:InterestRateSwapsMaturingBetween2024And2026Member
1819 Interest rate swaps, maturing between 2024 and 2025 Member glog:InterestRateSwapsMaturingBetween2024And2025Member
1820 Financial Instruments LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1821 Fixed Interest Rate Concept (Percent) As Of glog:DerivativeFixedInterestRates
1822 Notional Amount Concept (Monetary) As Of ifrs-full:NotionalAmount
1823 Trade date Concept (Text/String) For Period glog:TradeDate
1824 Effective date Concept (Text/String) For Period glog:EffectiveDate
1825 Termination date Concept (Text/String) For Period glog:TerminationDate
1826 Number of legacy facilities Concept (Integer) As Of glog:NumberOfLegacyFacilities
1827 Recycled loss of cash flow hedges reclassified to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedFutureCashFlowsAreNoLongerExpectedToOccurNetOfTax
1828 Unrealized gain/(loss) on derivative financial instruments held for trading Concept (Monetary) For Period Credit glog:UnrealizedGainLossOnDerivativeFinancialInstrumentsHeldForTrading
1829 42604 - Disclosure - Derivative Financial Instruments - Cross currency swap agreements (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureDerivativeFinancialInstrumentsCrossCurrencySwapAgreementsDetails
1830 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
1831 Hedging instruments [axis] Axis ifrs-full:HedgingInstrumentsAxis
1832 Hedging instruments [member] Member ifrs-full:HedgingInstrumentsMember
1833 Cross currency swaps qualified as cash flow hedging instruments Member glog:CrossCurrencySwapsQualifiedAsCashFlowHedgingInstrumentsMember
1834 Gaslog with counterparty DNB Bank ASA, traded in June 2016 Member glog:CrossCurrencySwapsQualifiedAsCashFlowHedgingInstrumentsOfGaslogWithCounterpartyDnbBankAsaTradedInJune2016Member
1835 Gaslog with counterparty SEB, traded in June 2016 Member glog:CrossCurrencySwapsQualifiedAsCashFlowHedgingInstrumentsOfGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublSebTradedInJune2016Member
1836 Gaslog with counterparty Nordea Bank Finland, traded in June 2016 Member glog:CrossCurrencySwapsQualifiedAsCashFlowHedgingInstrumentsOfGaslogWithCounterpartyNordeaBankFinlandTradedInJune2016Member
1837 Cross currency swap agreements LineItems ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
1838 Fixed Interest Rate Concept (Percent) As Of glog:DerivativeFixedInterestRates
1839 Notional Amount Concept (Monetary) As Of ifrs-full:NotionalAmount
1840 Trade date Concept (Text/String) For Period glog:TradeDate
1841 Effective date Concept (Text/String) For Period glog:EffectiveDate
1842 Original termination date Concept (Text/String) For Period glog:TerminationDate
1843 Number of cross currency swap agreements terminated Concept (Integer) For Period glog:NumberOfCrossCurrencySwapAgreementsTerminated
1844 Payment on termination of cash flow hedge at fair value Concept (Monetary) For Period Credit glog:PaymentOnTerminationOfCashFlowHedgeAtFairValue
1845 Number of cross currency swap agreements remaining Concept (Integer) For Period glog:NumberOfCrossCurrencySwapAgreements
1846 Recycled loss of cash flow hedges reclassified to profit or loss Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedFutureCashFlowsAreNoLongerExpectedToOccurNetOfTax
1847 Effective portion of changes in fair value of cash flow hedges Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesNetOfTax
1848 Recycled loss of cash flow hedges reclassified to profit or loss on realization of expense Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesForWhichHedgedItemAffectedProfitOrLossNetOfTax
1849 Hedging gain/(loss) recognized in other comprehensive income due to retranslation of bonds Concept (Monetary) For Period Credit glog:GainLossOnHedgeDueToRetranslationOfBondsRecognizedInOtherComprehensiveIncome
1850 42605 - Disclosure - Derivative Financial Instruments - Forward foreign exchange contracts (Details) Network

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*

 http://www.gaslogltd.com/role/DisclosureDerivativeFinancialInstrumentsForwardForeignExchangeContractsDetails
1851 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
1852 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1853 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1854 Forward foreign exchange contracts Member ifrs-full:ForwardContractMember
1855 GasLog with counterparty Citibank, settlement in January 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyCitibankSettlementInJanuary2019Member
1856 GasLog with counterparty Citibank, settlement in February 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyCitibankSettlementInFebruary2019Member
1857 GasLog with counterparty Citibank, settlement in March 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyCitibankSettlementInMarch2019Member
1858 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), settlement in January to March 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublSettlementInJanuaryToMarch2019Member
1859 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), settlement in April to June 2019 Member glog:ForwardForeignExchangeContractGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublsebSettlementInAprilToJune2019Member
1860 GasLog with counterparty Skandinavinska Enskilda Banken AB (publ) ("SEB"), settlement in July to December 2019 Member glog:ForwardForeignExchangeContractGaslogWithCounterpartySkandinavinskaEnskildaBankenAbPublsebSettlementInJulyToDecember2019Member
1861 GasLog with counterparty ABN Amro Bank NV ("ABN"), settlement in April 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyAbnAmroBankNvSettlementInApril2019Member
1862 GasLog with counterparty ABN Amro Bank NV ("ABN"), settlement in May 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyAbnAmroBankNvSettlementInMay2019Member
1863 GasLog with counterparty ABN Amro Bank NV ("ABN"), settlement in June 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyAbnAmroBankNvSettlementInJune2019Member
1864 GasLog with counterparty Dnb Bank, settlement in April 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyDnbBankSettlementInApril2018Member
1865 GasLog with counterparty Dnb Bank, settlement in May 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyDnbBankSettlementInMay2019Member
1866 GasLog with counterparty Dnb Bank, settlement in June 2019 Member glog:ForwardForeignExchangeContractsInGaslogWithCounterpartyDnbBankSettlementInJune2019Member
1867 GasLog with counterparty Nordea Bank AB, London Branch, settlement in July 2019 Member glog:GaslogWithCounterpartyNordeaBankAbLondonBranchSettlementInJuly2019Member
1868 GasLog with counterparty Nordea Bank AB, London Branch, settlement in September 2019 Member glog:GaslogWithCounterpartyNordeaBankAbLondonBranchSettlementInSeptember2019Member
1869 GasLog with counterparty Dnb Bank, settlement in July 2019 Member glog:GaslogWithCounterpartyDnbBankSettlementInJuly2019Member
1870 GasLog with counterparty Dnb Bank, settlement in August 2019 Member glog:GaslogWithCounterpartyDnbBankSettlementInAugust2019Member
1871 Currency [Axis] Axis srt:CurrencyAxis
1872 All Currencies [Domain] Member currency:AllCurrenciesDomain
1873 GBP Member currency:GBP
1874 EUR Member currency:EUR
1875 Forward foreign exchange contracts LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1876 Trade date Concept (Text/String) For Period glog:TradeDate
1877 Number of contracts Concept (Integer) As Of glog:IfrsNumberOfForeignCurrencyDerivativesHeld
1878 Settlement Date Concept (Text/String) For Period glog:SettlementDate
1879 Fixed Exchange Rate Concept (Pure) As Of glog:FixedForeignExchangeRate
1880 Notional Amount Concept (Monetary) As Of ifrs-full:NotionalAmount
1881 Unrealized gain/(loss) on derivative financial instruments held for trading Concept (Monetary) For Period Credit glog:UnrealizedGainLossOnDerivativeFinancialInstrumentsHeldForTrading
1882 42606 - Disclosure - Derivative Financial Instruments - Analysis of (Loss)/gain on derivatives (Details) Network

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 http://www.gaslogltd.com/role/DisclosureDerivativeFinancialInstrumentsAnalysisOfLossGainOnDerivativesDetails
1883 Disclosure of detailed information about financial instruments [table] Table

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 ifrs-full:DisclosureOfFinancialInstrumentsTable
1884 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
1885 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
1886 Interest rate swaps held for trading Member glog:InterestRateSwapsHeldForTradingMember
1887 Forward foreign exchange contracts Member ifrs-full:ForwardContractMember
1888 Financial Instruments LineItems ifrs-full:DisclosureOfFinancialInstrumentsLineItems
1889 Unrealized gain/(loss) on derivative financial instruments held for trading Concept (Monetary) For Period Credit glog:UnrealizedGainLossOnDerivativeFinancialInstrumentsHeldForTrading
1890 Realized gain/(loss) on derivative financial instruments held for trading Concept (Monetary) For Period Credit glog:RealizedGainLossOnDerivativeFinancialInstrumentsHeldForTrading
1891 Recycled loss of cash flow hedges reclassified to profit or loss Concept (Monetary) For Period Credit glog:GainLossOnCashFlowHedgeRecycledToProfitOrLoss
1892 Ineffective portion of cash flow hedges Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnIneffectivenessOfCashFlowHedgesRecognisedInProfitOrLoss
1893 Total (loss)/gain on derivatives Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives
1894 42607 - Disclosure - Derivative Financial Instruments - Fair value measurements (Details) Network

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 http://www.gaslogltd.com/role/DisclosureDerivativeFinancialInstrumentsFairValueMeasurementsDetails
1895 Implied Table Table

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*

 implied:Table
1896 Derivative Financial Instruments Abstract ifrs-full:DisclosureOfFinancialInstrumentsAbstract
1897 Transfers from Level 1 to Level 2, assets Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel1IntoLevel2OfFairValueHierarchyAssets
1898 Transfers from Level 2 to Level 1, assets Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel2IntoLevel1OfFairValueHierarchyAssets
1899 Transfers into Level 3, assets Concept (Monetary) For Period Debit ifrs-full:TransfersIntoLevel3OfFairValueHierarchyAssets
1900 Transfers out of Level 3, assets Concept (Monetary) For Period Credit ifrs-full:TransfersOutOfLevel3OfFairValueHierarchyAssets
1901 Transfers from Level 1 to Level 2, liabilities Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel1IntoLevel2OfFairValueHierarchyLiabilities
1902 Transfers from Level 2 to Level 1, liabilities Concept (Monetary) For Period ifrs-full:TransfersOutOfLevel2IntoLevel1OfFairValueHierarchyLiabilities
1903 Transfers into Level 3, liabilities Concept (Monetary) For Period Credit ifrs-full:TransfersIntoLevel3OfFairValueHierarchyLiabilities
1904 Transfers out of Level 3 of fair value hierarchy, liabilities Concept (Monetary) For Period Debit ifrs-full:TransfersOutOfLevel3OfFairValueHierarchyLiabilities
1905 42701 - Disclosure - Cash Flow Reconciliations - Reconciliation of borrowings, derivatives and leases arising from financing activities (Details) Network

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 http://www.gaslogltd.com/role/DisclosureCashFlowReconciliationsReconciliationOfBorrowingsDerivativesAndLeasesArisingFromFinancingActivitiesDetails
1906 Disclosure of reconciliation of liabilities arising from financing activities [table] Table

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 ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
1907 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
1908 Liabilities arising from financing activities [member] Member ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
1909 Borrowings Member glog:BorrowingMember
1910 Derivatives Member ifrs-full:DerivativesMember
1911 Finance lease liability Member ifrs-full:LeaseLiabilitiesMember
1912 Type of movement in liabilities from financing activities [Axis] Axis glog:TypeOfMovementInLiabilitiesFromFinancingActivitiesAxis
1913 Type Of Movement In Liabilities From Financing Activities [Domain] Member glog:TypeOfMovementInLiabilitiesFromFinancingActivitiesDomain
1914 Proceeds from bank loans and bonds Member glog:ProceedsFromBankLoansAndBondsMember
1915 Bank loans and bond repayments Member glog:BankLoansAndBondRepaymentsMember
1916 Additions in deferred loan/bond fees Member glog:AdditionsInDeferredLoanBondFeesMember
1917 Amortization of deferred loan and bond issuance costs and premium Member glog:AmortizationOfDeferredLoanAndBondIssuanceCostsAndPremiumMember
1918 Retranslation of the bonds in U.S. dollars Member glog:RetranslationOfBondsInU.s.DollarsMember
1919 Unrealized gain on derivative financial instruments held for trading including ineffective portion of cash flow hedge Member glog:UnrealizedGainOnDerivativeFinancialInstrumentsHeldForTradingIncludingIneffectivePortionOfCashFlowHedgeMember
1920 Unrealized loss on derivative financial instruments held for trading Member glog:UnrealizedLossOnDerivativeFinancialInstrumentsHeldForTradingMember
1921 Ineffective portion of cash flow hedges Member glog:IneffectivePortionOfCashFlowHedgesMember
1922 Payment for CCS termination Member glog:PaymentForCcsTerminationMember
1923 Effective portion of changes in the fair value of derivatives designated as cash flow hedging instruments Member glog:EffectivePortionOfChangesInFairValueOfDerivativesDesignatedAsCashFlowHedgingInstrumentsMember
1924 Finance lease charge Member glog:FinanceLeaseChargeMember
1925 Payments for interest Member glog:PaymentsForInterestMember
1926 Payments for finance lease liability Member glog:PaymentsForFinanceLeaseLiabilityMember
1927 Disclosure of reconciliation of liabilities arising from financing activities LineItems ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
1928 Liabilities/(assets) arising from financing activities at beginning of period Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1929 Cash flows Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
1930 Other comprehensive income Concept (Monetary) For Period Credit glog:IncreaseDecreaseThroughOtherComprehensiveIncomeLiabilitiesArisingFromFinancingActivities
1931 Non-cash items Concept (Monetary) For Period Credit glog:IncreaseDecreaseThroughNonCashItemsLiabilitiesArisingFromFinancingActivities
1932 Deferred financing costs, assets Concept (Monetary) For Period Credit glog:IncreaseDecreaseThroughDeferredFinancingCostsLiabilitiesArisingFromFinancingActivities
1933 Total Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInLiabilitiesArisingFromFinancingActivities
1934 Liabilities/(assets) arising from financing activities at end of period Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1935 42702 - Disclosure - Cash Flow Reconciliations - Reconciliation of tangible fixed assets, vessels under construction and vessel held under finance lease (Details) Network

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 http://www.gaslogltd.com/role/DisclosureCashFlowReconciliationsReconciliationOfTangibleFixedAssetsVesselsUnderConstructionAndVesselHeldUnderFinanceLeaseDetails
1936 Implied Table Table

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 implied:Table
1937 Cash Flow Reconciliations Abstract glog:NetChangeInNonCashItemsOnStatementOfCashFlowsAbstract
1938 Cash flows Abstract glog:ReconciliationOfVesselsArisingFromInvestingActivitiesCashFlowsAbstract
1939 Additions cash flows Concept (Monetary) For Period Debit glog:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentCashFlows
1940 Cash flows Concept (Monetary) For Period Debit glog:IncreaseDecreaseThroughCashFlowsPropertyPlantAndEquipment
1941 Non-cash items Abstract glog:ReconciliationOfVesselsArisingFromInvestingActivitiesNonCashItemsAbstract
1942 Additions non-cash Concept (Monetary) For Period Debit glog:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentNonCashItems
1943 Transfer under "Other non-current assets" Concept (Monetary) For Period Credit glog:TransferUnderOtherNonCurrentAssetsNonCashItems
1944 Depreciation expense Concept (Monetary) For Period Credit glog:DepreciationExpenseNonCashItems
1945 Non-cash Concept (Monetary) For Period Debit glog:IncreaseDecreaseThroughNonCashItemsPropertyPlantAndEquipment
1946 Total Abstract ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
1947 Balance, at the beginning of the year Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1948 Additions (Note 6) Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
1949 Transfer under "Other non-current assets" Concept (Monetary) For Period Credit glog:DecreaseThroughTransfersUnderOtherNonCurrentAssetsPropertyPlantAndEquipment
1950 Depreciation expense (Note 6) Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
1951 Balance, at the end of the year Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
1952 42703 - Disclosure - Cash Flow Reconciliations - Reconciliation of equity offering arising from financing activities (Details) Network

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 http://www.gaslogltd.com/role/DisclosureCashFlowReconciliationsReconciliationOfEquityOfferingArisingFromFinancingActivitiesDetails
1953 Implied Table Table

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 implied:Table
1954 Cash Flow Reconciliations Abstract glog:NetChangeInNonCashItemsOnStatementOfCashFlowsAbstract
1955 Cash flows Abstract glog:ReconciliationOfEquityOfferingsArisingFromFinancingActivitiesCashFlowsAbstract
1956 Proceeds from GasLog Partners' common unit offerings (net of underwriting discounts and commissions) Concept (Monetary) For Period Debit glog:ProceedsFromIssuanceOfRelatedEntityCommonUnitOfferings
1957 Proceeds from GasLog Partners' preference unit offerings (net of underwriting discounts and commissions) Concept (Monetary) For Period Debit glog:ProceedsFromIssuanceOfRelatedEntityPreferenceUnitOfferings
1958 Offering costs Concept (Monetary) For Period Credit ifrs-full:PaymentsForShareIssueCosts
1959 Net proceeds from equity offerings in the year Concept (Monetary) For Period Debit glog:NetProceedsFromEquityOfferingsCashFlows
1960 Non-cash items Abstract glog:ReconciliationOfEquityOfferingsArisingFromFinancingActivitiesNonCashItemsAbstract
1961 Offering costs Concept (Monetary) For Period Credit glog:PaymentsForShareIssueCostsNonCashItems
1962 Net proceeds from equity offerings in the year Concept (Monetary) For Period Debit glog:NetProceedsFromEquityOfferingsNonCashItems
1963 Total Abstract glog:ReconciliationOfEquityOfferingsArisingFromFinancingActivitiesTotalAbstract
1964 Proceeds from GasLog Partners' common unit offerings (net of underwriting discounts and commissions) Concept (Monetary) For Period Debit glog:ProceedsFromIssuanceOfPublicOfferingsAndIssuanceOfGeneralPartnerUnitsTotal
1965 Proceeds from GasLog Partners' preference unit offerings (net of underwriting discounts and commissions) Concept (Monetary) For Period Debit glog:ProceedsFromIssuanceOfPublicOfferingsAndIssuanceOfPreferenceUnitsTotal
1966 Offering costs Concept (Monetary) For Period Credit glog:PaymentsForShareIssueCostsTotal
1967 Net proceeds from equity offerings in the year Concept (Monetary) For Period Debit glog:NetProceedsFromEquityOfferingsTotal
1968 42801 - Disclosure - Taxation (Details) Network

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 http://www.gaslogltd.com/role/DisclosureTaxationDetails
1969 Implied Table Table

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 implied:Table
1970 Taxation Abstract ifrs-full:MajorComponentsOfTaxExpenseIncomeAbstract
1971 U.S. Federal income tax rate (in percent) Concept (Percent) For Period ifrs-full:ApplicableTaxRate
1972 U.S. source gross transportation income (as percentage of gross shipping income for transportation that begins or ends in the United States) Concept (Percent) For Period glog:GrossShippingIncomePercentage
1973 42901 - Disclosure - Earnings/(losses) per share ("EPS") (Details) Network

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 http://www.gaslogltd.com/role/DisclosureEarningsLossesPerShareepsDetails
1974 Earnings per share [table] Table

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 ifrs-full:EarningsPerShareTable
1975 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1976 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1977 SARs Member glog:StockAppreciationRightsOrStockOptionsMember
1978 RSUs Member glog:RestrictedStockUnitsMember
1979 Earnings/(losses) per share ("EPS") LineItems ifrs-full:EarningsPerShareLineItems
1980 Basic (loss)/earnings per share Abstract ifrs-full:BasicEarningsPerShareAbstract
1981 Profit/(loss) for the year attributable to owners of the Group Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
1982 Less: Dividends on Preference Shares Concept (Monetary) For Period Debit ifrs-full:AdjustmentToProfitLossForPreferenceShareDividends
1983 (Loss)/profit for the year available to owners of the Group Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
1984 Weighted average number of shares outstanding, basic Concept (Shares) For Period ifrs-full:WeightedAverageShares
1985 Basic (loss)/earnings per share Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
1986 Diluted (loss)/earnings per share Abstract glog:DilutedWeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
1987 (Loss)/profit for the year available to owners of the Group used in the calculation of diluted EPS Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffects
1988 Weighted average number of shares outstanding, basic Concept (Shares) For Period ifrs-full:WeightedAverageShares
1989 Dilutive potential ordinary shares Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
1990 Weighted average number of shares used in the calculation of diluted EPS Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
1991 Diluted (loss)/earnings per share Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
1992 Anti-dilutive potential ordinary shares Concept (Shares) For Period glog:SharesWithPotentialFutureDilutiveEffectButNotIncludedInCalculation
1993 43001 - Disclosure - Subsequent Events (Details) Network

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 http://www.gaslogltd.com/role/DisclosureSubsequentEventsDetails
1994 Disclosure of non-adjusting events after reporting period [table] Table

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 ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodTable
1995 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1996 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
1997 Announcement of unit repurchase programme Member glog:UnitRepurchaseProgrammeMember
1998 Refinancing Member glog:RefinancingMember
1999 Change to ATM Programme Member ifrs-full:MajorOrdinaryShareTransactionsMember
2000 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
2001 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
2002 Common shares/units Member ifrs-full:OrdinarySharesMember
2003 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
2004 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
2005 Gaslog Partners Facility 2019 Member glog:GaslogPartnersFacility2019Member
2006 Ifrs Sale of Stock [Axis] Axis glog:IfrsSaleOfStockAxis
2007 Sale Of Stock [Domain] Member glog:SaleOfStockDomain
2008 ATM Programme Member glog:AtMarketProgramMember
2009 Legal Entity [Axis] Axis dei:LegalEntityAxis
2010 Entity [Domain] Member dei:EntityDomain
2011 GasLog Partners LP Member glog:GaslogPartnersLpMember
2012 Subsequent Events LineItems ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
2013 Unit repurchase programme limit Concept (Monetary) For Period glog:UnitRepurchaseProgrammeLimit
2014 Declaration of quarterly cash dividend (per share) Concept (Share) For Period ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
2015 Amount of credit facility Concept (Monetary) As Of Credit glog:IfrsLineOfCreditFacilityMaximumBorrowingCapacity
2016 Number of vessels on which the existing indebtedness is refinanced Concept (Integer) As Of glog:NumberOfVesselsOnWhichExistingIndebtednessIsRefinanced
2017 Term of debt instrument Concept (xbrli:durationItemType) For Period glog:TermOfDebtInstrument
2018 Size of ATM Programme Concept (Monetary) As Of Debit glog:AggregateOfferingValue

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