IAMGOLD CORP (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 0001000 - Document - Document and Entity Information Network

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 http://www.iamgold.com/role/DocumentAndEntityInformation
2 Implied Table Table

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3 Document and Entity Information [Abstract] Abstract iag: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 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
8 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
9 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
10 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
11 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
12 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
13 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
14 1001000 - Statement - CONSOLIDATED BALANCE SHEETS Network

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 http://www.iamgold.com/role/ConsolidatedBalanceSheets
15 Implied Table Table

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16 Statement of financial position [abstract] Abstract ifrs-full:StatementOfFinancialPositionAbstract
17 Assets Abstract ifrs-full:AssetsAbstract
18 Current assets Abstract ifrs-full:CurrentAssetsAbstract
19 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
20 Short-term investments Concept (Monetary) As Of Debit ifrs-full:CurrentInvestments
21 Consideration receivable Concept (Monetary) As Of Debit iag:ConsiderationReceivableCurrent
22 Receivables and other current assets Concept (Monetary) As Of Debit iag:TradeAndOtherCurrentReceivablesAndOtherCurrentAssets
23 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
24 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
25 Non-current assets Abstract ifrs-full:NoncurrentAssetsAbstract
26 Investments in associates and incorporated joint ventures Concept (Monetary) As Of Debit ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
27 Property, plant and equipment Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
28 Exploration and evaluation assets Concept (Monetary) As Of Debit ifrs-full:AssetsArisingFromExplorationForAndEvaluationOfMineralResources
29 Income taxes receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTaxAssetsNoncurrent
30 Restricted cash Concept (Monetary) As Of Debit ifrs-full:NoncurrentRestrictedCashAndCashEquivalents
31 Inventories Concept (Monetary) As Of Debit ifrs-full:NoncurrentOreStockpiles
32 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
33 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
34 Assets Concept (Monetary) As Of Debit ifrs-full:Assets
35 Liabilities and Equity Abstract ifrs-full:EquityAndLiabilitiesAbstract
36 Current liabilities Abstract ifrs-full:CurrentLiabilitiesAbstract
37 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
38 Income taxes payable Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilitiesCurrent
39 Current portion of provisions Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
40 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
41 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
42 Non-current liabilities Abstract ifrs-full:NoncurrentLiabilitiesAbstract
43 Deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
44 Provisions Concept (Monetary) As Of Credit ifrs-full:OtherLongtermProvisions
45 Long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
46 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
47 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
48 Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
49 Equity Abstract ifrs-full:EquityAbstract
50 Common shares Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
51 Contributed surplus Concept (Monetary) As Of Credit ifrs-full:AdditionalPaidinCapital
52 Retained earnings Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
53 Accumulated other comprehensive loss Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
54 Equity attributable to IAMGOLD Corporation shareholders Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
55 Non-controlling interests Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
56 Equity Concept (Monetary) As Of Credit ifrs-full:Equity
57 Contingencies and commitments Concept (Monetary) As Of Credit iag:CommitmentsAndContingencies1
58 Equity and liabilities Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
59 1002000 - Statement - CONSOLIDATED STATEMENTS OF EARNINGS Network

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 http://www.iamgold.com/role/ConsolidatedStatementsOfEarnings
60 Implied Table Table

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 implied:Table
61 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
62 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
63 Cost of sales Concept (Monetary) For Period Debit ifrs-full:CostOfSales
64 Gross profit Concept (Monetary) For Period Credit ifrs-full:GrossProfit
65 General and administrative expenses Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
66 Exploration expenses Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
67 Reversal of impairment charges Concept (Monetary) For Period ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
68 Other expenses Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
69 Earnings from operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
70 Share of net earnings from investments in associates and incorporated joint ventures, net of income taxes Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
71 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
72 Foreign exchange gain (loss) Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
73 Interest income, derivatives and other investment gains (losses) Concept (Monetary) For Period Credit ifrs-full:FinanceIncome
74 Earnings before income taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
75 Income taxes Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
76 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
77 Net earnings (loss) attributable to Abstract ifrs-full:ProfitLossAttributableToAbstract
78 Equity holders of IAMGOLD Corporation Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
79 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
80 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
81 Attributable to equity holders of IAMGOLD Corporation Abstract ifrs-full:EarningsPerShareAbstract
82 Weighted average number of common shares outstanding Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
83 Basic (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
84 Diluted (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
85 Earnings (loss) per share Abstract ifrs-full:BasicAndDilutedEarningsPerShareAbstract
86 Basic (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
87 Diluted (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
88 1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Network

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 http://www.iamgold.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss
89 Implied Table Table

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90 Statement of comprehensive income [abstract] Abstract ifrs-full:StatementOfComprehensiveIncomeAbstract
91 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
92 Other comprehensive income (loss), net of income taxes Abstract ifrs-full:OtherComprehensiveIncomeAbstract
93 Items that will not be reclassified to the statements of earnings Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract
94 Movement in marketable securities fair value reserve Abstract ifrs-full:AvailableforsaleFinancialAssetsAbstract
95 Net unrealized change in fair value of marketable securities Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsBeforeTax
96 Net realized change in fair value of marketable securities Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnAvailableforsaleFinancialAssetsBeforeTax
97 Tax impact Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToAvailableforsaleFinancialAssetsOfOtherComprehensiveIncome
98 Other comprehensive income (loss), net of income tax Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets
99 Items that may be reclassified to the statements of earnings Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract
100 Movement in cash flow hedge fair value reserve Abstract ifrs-full:CashFlowHedgesAbstract
101 Effective portion of changes in fair value of cash flow hedges Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnCashFlowHedgesBeforeTax
102 Time value of options contracts excluded from hedge relationship Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInValueOfTimeValueOfOptionsBeforeTax
103 Net change in fair value of cash flow hedges reclassified to the statements of earnings Concept (Monetary) For Period Debit ifrs-full:ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax
104 Tax impact Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome
105 Other comprehensive income, net of income taxes Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges
106 Currency translation adjustment Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation
107 Total other comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
108 Comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
109 Comprehensive income (loss) attributable to: Abstract ifrs-full:ComprehensiveIncomeAttributableToAbstract
110 Equity holders of IAMGOLD Corporation Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
111 Non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
112 Comprehensive income (loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
113 1004000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Network

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 http://www.iamgold.com/role/ConsolidatedStatementsOfChangesInEquity
114 Statement of changes in equity [table] Table

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 ifrs-full:StatementOfChangesInEquityTable
115 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
116 Equity Member ifrs-full:EquityMember
117 Equity attributable to equity holders of IAMGOLD Corporation Member ifrs-full:EquityAttributableToOwnersOfParentMember
118 Common shares Member ifrs-full:IssuedCapitalMember
119 Contributed surplus Member ifrs-full:SharePremiumMember
120 Retained earnings Member ifrs-full:RetainedEarningsMember
121 Accumulated other comprehensive loss Member ifrs-full:AccumulatedOtherComprehensiveIncomeMember
122 Marketable securities fair value reserve Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
123 Cash flow hedge fair value reserve Member ifrs-full:ReserveOfCashFlowHedgesMember
124 Currency translation adjustment Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
125 Non-controlling interests Member ifrs-full:NoncontrollingInterestsMember
126 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
127 Equity Concept (Monetary) As Of Credit ifrs-full:Equity
128 Issuance of common shares Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
129 Issuance of flow-through common shares Concept (Monetary) For Period Credit iag:IssueOfEquityFlowthrough
130 Issuance of common shares for share-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
131 Share-based compensation Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
132 Other Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity
133 Net earnings (loss) attributable to equity holders of IAMGOLD Corporation Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
134 Net change in fair value of marketable securities and cash flow hedges recognized in other comprehensive income net of income taxes Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncome
135 Net change in fair value of cash flow hedges recognized in property, plant and equipment Concept (Monetary) For Period Debit ifrs-full:AmountRemovedFromReserveOfCashFlowHedgesAndIncludedInInitialCostOrOtherCarryingAmountOfNonfinancialAssetLiabilityOrFirmCommitmentForWhichFairValueHedgeAccountingIsApplied
136 Dividends to non-controlling interests Concept (Monetary) For Period Debit ifrs-full:DividendsPaid
137 Equity Concept (Monetary) As Of Credit ifrs-full:Equity
138 1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Network

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 http://www.iamgold.com/role/ConsolidatedStatementsOfCashFlows
139 Implied Table Table

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140 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
141 Operating activities Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
142 Net earnings (loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
143 Adjustments for: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
144 Finance costs Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFinanceCosts
145 Depreciation expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationExpense
146 Derivative gain Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
147 Income taxes Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncomeTaxExpense
148 Interest income Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForInterestIncome
149 Reversal of impairment charges Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
150 Gain on sale of a 30% interest in the Côté Gold Project Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates
151 Share of net earnings from investments in associates and incorporated joint ventures, net of income taxes Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod
152 Write-down of inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories
153 Loss on redemption of 6.75% Senior Notes Concept (Monetary) For Period Credit ifrs-full:GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid
154 Write-down of related party loan receivable Concept (Monetary) For Period Credit iag:AdjustmentForLossesGainsOnSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
155 Write-down of assets Concept (Monetary) For Period Debit ifrs-full:ImpairmentLoss
156 Effects of exchange rate fluctuation on short-term investments Concept (Monetary) For Period Credit iag:AdjustmentsForEffectOfExchangeRateChangesOnShortTermInvestmentsOperating
157 Effects of exchange rate fluctuation on cash and cash equivalents Concept (Monetary) For Period Credit iag:EffectOfExchangeRateChangesOnCashAndCashEquivalentsOperating
158 Other non-cash items Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsForNoncashItems
159 Adjustments for cash items: Abstract ifrs-full:ClassesOfCashPaymentsAbstract
160 Dividends from Sadiola Concept (Monetary) For Period Debit ifrs-full:DividendsReceivedClassifiedAsOperatingActivities
161 Settlement of derivatives Concept (Monetary) For Period Credit iag:CashPaymentsForFuturesContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsOperatingActivities
162 Disbursements related to asset retirement obligations Concept (Monetary) For Period Credit iag:PaymentsForDecommissioningRestorationAndRehabilitationCosts
163 Movements in non-cash working capital items and non-current ore stockpiles Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
164 Cash from operating activities, before income taxes paid Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperations
165 Income taxes paid Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities
166 Net cash from operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
167 Investing activities Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
168 Capital expenditures for property, plant and equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
169 Capitalized borrowing costs Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
170 Capital expenditures for exploration and evaluation assets Concept (Monetary) For Period Credit ifrs-full:PurchaseOfExplorationAndEvaluationAssets
171 Net proceeds from sale of a 30% interest in the Côté Gold Project Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInterestsInAssociates
172 Decrease in restricted cash Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents
173 Acquisition of Saramacca exploration and evaluation asset Concept (Monetary) For Period Credit iag:PaymentOfAdditionalAcquisitionOfExplorationAndEvaluationAssets
174 Interest received Concept (Monetary) For Period Debit ifrs-full:InterestReceivedClassifiedAsInvestingActivities
175 Disposal of short-term investments Concept (Monetary) For Period Credit ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities
176 (Purchase) of short-term investments Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod
177 Purchase of additional common shares of associate Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInAssociates
178 Other investing activities Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities
179 Net cash used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
180 Financing activities Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
181 Interest paid Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
182 Payment of finance lease obligations Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfOrdinaryShares
183 Dividends paid to non-controlling interests Concept (Monetary) For Period Credit iag:RepaymentsOfLongtermLinesOfCredit1
184 Redemption of 6.75% Senior Notes Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
185 Net proceeds from issuance of 7% Senior Notes Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
186 Long-term prepayment for finance lease Concept (Monetary) For Period Credit ifrs-full:PaymentsOfFinanceLeaseLiabilitiesClassifiedAsFinancingActivities
187 Proceeds from issuance of flow-through shares Concept (Monetary) For Period Debit iag:ProceedsFromIssueOfFlowThroughOrdinaryShares
188 Other financing activities Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities
189 Net cash used in financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
190 Effects of exchange rate fluctuation on cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
191 Increase (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
192 Cash and cash equivalents, beginning of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
193 Cash and cash equivalents, end of the year Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
194 1005501 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Network

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 http://www.iamgold.com/role/ConsolidatedStatementsOfCashFlowsParenthetical
195 Investment [Table] Table

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 invest:InvestmentTable
196 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
197 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
198 Disposal Of Interest In Cote Gold Project Member iag:DisposalOfInterestInCoteGoldProjectMember
199 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
200 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
201 Fixed interest rate Member ifrs-full:FixedInterestRateMember
202 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
203 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
204 Senior Notes at 6.75% Member iag:SixPointSevenFivePercentSeniorUnsecuredNotesDue2020Member
205 7.0% Senior Notes Member iag:SevenPercentSeniorSecuredNotesDue2025Member
206 Investment [Line Items] LineItems invest:InvestmentLineItems
207 Proportion of ownership interest sold in joint venture Concept (Percent) For Period iag:ProportionOfOwnershipInterestSoldInAssociate
208 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
209 2101100 - Disclosure - CORPORATE INFORMATION Network

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210 Implied Table Table

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211 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract iag:CorporateInformationAndStatementOfIFRSComplianceAbstract
212 CORPORATE INFORMATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNotesAndOtherExplanatoryInformationExplanatory
213 2102100 - Disclosure - BASIS OF PREPARATION Network

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214 Implied Table Table

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215 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract iag:CorporateInformationAndStatementOfIFRSComplianceAbstract
216 BASIS OF PREPARATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
217 2103100 - Disclosure - ADOPTION OF NEW ACCOUNTING STANDARDS (Notes) Network

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218 Implied Table Table

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219 Accounting Changes and Error Corrections1 [Abstract] Abstract iag:AccountingChangesandErrorCorrections1Abstract
220 ADOPTION OF NEW ACCOUNTING STANDARDS Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
221 2104100 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Network

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222 Implied Table Table

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223 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract iag:CorporateInformationAndStatementOfIFRSComplianceAbstract
224 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
225 2107100 - Disclosure - NEW ACCOUNTING STANDARDS ISSUED BUT NOT YET EFFECTIVE Network

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 http://www.iamgold.com/role/NewAccountingStandardsIssuedButNotYetEffective
226 Implied Table Table

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227 Accounting Policies, Changes In Accounting Estimates And Errors [Abstract] Abstract iag:AccountingPoliciesChangesInAccountingEstimatesAndErrorsAbstract
228 NEW ACCOUNTING STANDARDS ISSUED BUT NOT YET EFFECTIVE Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
229 2110100 - Disclosure - ACQUISITION Network

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230 Implied Table Table

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231 Acquisition [Abstract] Abstract iag:AcquisitionAbstract
232 ACQUISITION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationExplanatory
233 2113100 - Disclosure - CASH AND CASH EQUIVALENTS Network

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 http://www.iamgold.com/role/CashAndCashEquivalents
234 Implied Table Table

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235 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
236 CASH AND CASH EQUIVALENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
237 2116100 - Disclosure - SHORT-TERM INVESTMENTS Network

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 http://www.iamgold.com/role/ShortTermInvestments
238 Implied Table Table

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239 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
240 SHORT-TERM INVESTMENTS Concept (Text Block (HTML)) For Period iag:InvestmentCurrentTextBlock
241 2119100 - Disclosure - RESTRICTED CASH Network

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 http://www.iamgold.com/role/RestrictedCash
242 Implied Table Table

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243 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
244 RESTRICTED CASH Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRestrictedCashAndCashEquivalentsExplanatory
245 2122100 - Disclosure - CONSIDERATION RECEIVABLE Network

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 http://www.iamgold.com/role/ConsiderationReceivable
246 Implied Table Table

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247 Non-current Asset Held For Sale And Discontinued Operations [Abstract] Abstract iag:NoncurrentAssetHeldForSaleAndDiscontinuedOperationsAbstract
248 CONSIDERATION RECEIVABLE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNoncurrentAssetsHeldForSaleAndDiscontinuedOperationsExplanatory
249 2125100 - Disclosure - RECEIVABLES AND OTHER CURRENT ASSETS Network

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 http://www.iamgold.com/role/ReceivablesAndOtherCurrentAssets
250 Implied Table Table

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251 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
252 RECEIVABLES AND OTHER CURRENT ASSETS Concept (Text Block (HTML)) For Period iag:DisclosureOfCurrentReceivablesAndOtherCurrentAssetsTextBlock
253 2128100 - Disclosure - INVENTORIES Network

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 http://www.iamgold.com/role/Inventories
254 Implied Table Table

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255 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
256 INVENTORIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
257 2131100 - Disclosure - INVESTMENTS IN ASSOCIATES AND INCORPORATED JOINT VENTURES Network

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 http://www.iamgold.com/role/InvestmentsInAssociatesAndIncorporatedJointVentures
258 Implied Table Table

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259 Interests In Other Entities [Abstract] Abstract iag:InterestsInOtherEntitiesAbstract
260 INVESTMENTS IN ASSOCIATES AND INCORPORATED JOINT VENTURES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInOtherEntitiesExplanatory
261 2134100 - Disclosure - PROPERTY, PLANT AND EQUIPMENT Network

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 http://www.iamgold.com/role/PropertyPlantAndEquipment
262 Implied Table Table

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263 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
264 PROPERTY, PLANT AND EQUIPMENT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
265 2137100 - Disclosure - EXPLORATION AND EVALUATION ASSETS Network

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 http://www.iamgold.com/role/ExplorationAndEvaluationAssets
266 Implied Table Table

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272 OTHER NON-CURRENT ASSETS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherNoncurrentAssetsExplanatory
273 2143100 - Disclosure - PROVISIONS Network

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274 Implied Table Table

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276 PROVISIONS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProvisionsExplanatory
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280 OTHER LIABILITIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherLiabilitiesExplanatory
281 2149100 - Disclosure - INCOME TAXES Network

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284 INCOME TAXES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
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288 LONG-TERM DEBT AND CREDIT FACILITIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
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292 FINANCIAL INSTRUMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
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296 FAIR VALUE MEASUREMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementExplanatory
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304 SHARE CAPITAL Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
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316 SHARE-BASED COMPENSATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
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320 COST OF SALES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCostOfSalesExplanatory
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324 GENERAL AND ADMINISTRATIVE EXPENSES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfGeneralAndAdministrativeExpenseExplanatory
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 http://www.iamgold.com/role/OtherExpenses
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329 2183100 - Disclosure - FINANCE COSTS Network

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332 FINANCE COSTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceCostExplanatory
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 http://www.iamgold.com/role/ExpensesByNature
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369 Basis of measurement Concept (Text Block (HTML)) For Period ifrs-full:ExplanationOfMeasurementBasesUsedInPreparingFinancialStatements
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371 Associates Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentInAssociates
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379 Mining properties Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForMiningAssetsExplanatory
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381 Depreciation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDepreciationExpenseExplanatory
382 Mineral exploration and evaluation expenditures Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForExplorationAndEvaluationExpenditures
383 Other intangible assets Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
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386 Asset retirement obligations Concept (Text Block (HTML)) For Period iag:AssetRetirementObligation1PolicyTextBlock
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390 Earnings per share Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
391 Share-based compensation Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
392 Revenue recognition Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
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396 2302302 - Disclosure - BASIS OF PREPARATION (Tables) Network

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399 Disclosure of subsidiaries Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory
400 Disclosure of joint ventures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfJointVenturesExplanatory
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 http://www.iamgold.com/role/CashAndCashEquivalentsTables
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408 Schedule of Cash and Cash Equivalents Concept (Text Block (HTML)) For Period iag:DisclosureOfComponentsOfCashAndCashEquivalentsTableTextBlock
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 http://www.iamgold.com/role/ShortTermInvestmentsTables
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416 Components of receivables and other current assets Concept (Text Block (HTML)) For Period iag:ComponentsOfCurrentReceivablesAndOtherCurrentAssetsTableTextBlock
417 2328301 - Disclosure - INVENTORIES (Tables) Network

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 http://www.iamgold.com/role/InventoriesTables
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 http://www.iamgold.com/role/InvestmentsInAssociatesAndIncorporatedJointVenturesTables
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425 Disclosure of joint ventures Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInJointArrangementsExplanatory
426 Disclosure of reconciliation of summarised financial information of joint venture accounted for using equity method to carrying amount of interest in joint venture Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfReconciliationOfSummarisedFinancialInformationOfJointVentureAccountedForUsingEquityMethodToCarryingAmountOfInterestInJointVentureExplanatory
427 Disclosure of joint venture carrying amount Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfJointVenturesExplanatory
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 http://www.iamgold.com/role/PropertyPlantAndEquipmentTables
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432 2337301 - Disclosure - EXPLORATION AND EVALUATION ASSETS (Tables) Network

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 http://www.iamgold.com/role/OtherNonCurrentAssetsTables
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439 Schedule of Other Non-Current Assets Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceLeaseAndOperatingLeaseByLessorExplanatory
440 2343301 - Disclosure - PROVISIONS (Tables) Network

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 http://www.iamgold.com/role/ProvisionsTables
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443 Disclosure of Provisions Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherProvisionsExplanatory
444 Disclosure of Asset Retirement Obligations Concept (Text Block (HTML)) For Period iag:DisclosureOfAssetRetirementObligationsTableTextBlock
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 http://www.iamgold.com/role/OtherLiabilitiesTables
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 http://www.iamgold.com/role/IncomeTaxesTables
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455 Income tax expense/(recoveries) related to OCI Concept (Text Block (HTML)) For Period iag:DisclosureOfTaxExpenseIncomeRelatedToOtherComprehensiveIncomeTableTextBlock
456 Disclosure of unrecognized deferred income tax assets Concept (Text Block (HTML)) For Period iag:DisclosureOfUnrecognizedDeferredIncomeTaxAssetsTableTextBlock
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 http://www.iamgold.com/role/LongTermDebtAndCreditFacilitiesTables
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 http://www.iamgold.com/role/FinancialInstrumentsTables
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466 Disclosure of terms and conditions of outstanding derivative contracts Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutTermsAndConditionsOfHedgingInstrumentsAndHowTheyAffectFutureCashFlowsExplanatory
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468 Disclosure of detailed information about hedged items Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutHedgedItemsExplanatory
469 Disclosure of detailed information about non-hedge derivatives Concept (Text Block (HTML)) For Period iag:DisclosureOfDetailedInformationAboutNonHedgeItemsTableTextBlock
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 http://www.iamgold.com/role/FairValueMeasurementsTables
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474 Fair value measurement of liabilities Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementOfLiabilitiesExplanatory
475 Fair value of marketable securities and warrants Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory
476 2361301 - Disclosure - CAPITAL MANAGEMENT (Tables) Network

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 http://www.iamgold.com/role/CapitalManagementTables
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 http://www.iamgold.com/role/EarningsPerShareTables
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 http://www.iamgold.com/role/ShareBasedCompensationTables
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498 Weighted average inputs used in determining the fair value of the options granted Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory
499 Full value awards consisting of restricted share units Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory
500 Weighted average inputs used in determining fair value of restricted share units Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentsGrantedDuringPeriodExplanatory
501 2376301 - Disclosure - COST OF SALES (Tables) Network

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 http://www.iamgold.com/role/CostOfSalesTables
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 http://www.iamgold.com/role/GeneralAndAdminstrativeExpensesTables
506 Implied Table Table

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508 Disclosure of General and Administrative Expenses Concept (Text Block (HTML)) For Period iag:DisclosureofGeneralandAdministrativeExpensesTableTextBlock
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 http://www.iamgold.com/role/OtherExpensesTables
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 http://www.iamgold.com/role/FinanceCostsTables
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532 2387301 - Disclosure - REVERSAL OF IMPAIRMENT CHARGES (Tables) Network

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783 Mining properties, stripping costs, depreciation expense Concept (Monetary) For Period Debit iag:PropertyPlantAndEquipmentCapitalizedStrippingCostsDeprecation
784 Carrying amount of plant and equipment held under finance leases Concept (Monetary) As Of Debit ifrs-full:RecognisedFinanceLeaseAsAssets
785 2437402 - Disclosure - EXPLORATION AND EVALUATION ASSETS (Details) Network

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 http://www.iamgold.com/role/ExplorationAndEvaluationAssetsDetails
786 Disclosure of detailed information about property, plant and equipment [table] Table

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 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
787 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
788 Property, plant and equipment Member ifrs-full:PropertyPlantAndEquipmentMember
789 Exploration and evaluation assets Member ifrs-full:TangibleExplorationAndEvaluationAssetsMember
790 Name of Property [axis] Axis iag:NameOfProperty1Axis
791 Name Of Property [Domain] Member iag:NameOfProperty1Domain
792 Côté Gold Project Member iag:CoteGoldProjectMember
793 Saramacca Project Member iag:SaramaccaPropertyMember
794 Diakha-Siribaya Gold Project Member iag:SiribayaProjectMember
795 Other Projects Member iag:OtherProjectMember
796 Nelligan Project Member iag:NelliganProjectMember
797 Boto Project Member iag:BotoProjectMember
798 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
799 Assets [member] Member ifrs-full:ClassesOfAssetsMember
800 Exploration and evaluation assets Member ifrs-full:ExplorationAndEvaluationAssetsMember
801 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
802 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
803 Disposal Of Interest In Cote Gold Project Member iag:DisposalOfInterestInCoteGoldProjectMember
804 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
805 Reconciliation of changes in property, plant and equipment [abstract] Abstract ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
806 Balance, beginning of the year Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
807 Exploration and evaluation expenditures Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
808 Acquired Exploration and evaluation assets Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
809 Reversal of impairment charge Concept (Monetary) For Period ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
810 Transfers to Property, plant and equipment4 Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersFromConstructionInProgressPropertyPlantAndEquipment
811 Sale of a 30% interest in the Côté Gold Project Concept (Monetary) For Period Credit ifrs-full:DisposalsPropertyPlantAndEquipment
812 Balance, end of the year Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
813 Proportion of ownership interest sold in joint venture Concept (Percent) For Period iag:ProportionOfOwnershipInterestSoldInAssociate
814 Payments for exploration and evaluation expenses Concept (Monetary) For Period Credit ifrs-full:PaymentsForExplorationAndEvaluationExpenses
815 Borrowing costs capitalised Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
816 Capitalisation rate of borrowing costs eligible for capitalisation Concept (Percent) For Period ifrs-full:CapitalisationRateOfBorrowingCostsEligibleForCapitalisation
817 2437403 - Disclosure - EXPLORATION AND EVALUATION ASSETS - Narrative (Details) Network

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 http://www.iamgold.com/role/ExplorationAndEvaluationAssetsNarrativeDetails
818 Disclosure of detailed information about property, plant and equipment [table] Table

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*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
819 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
820 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
821 Disposal Of Interest In Cote Gold Project Member iag:DisposalOfInterestInCoteGoldProjectMember
822 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
823 Assets [member] Member ifrs-full:ClassesOfAssetsMember
824 Exploration and evaluation assets Member ifrs-full:ExplorationAndEvaluationAssetsMember
825 Name of Property [axis] Axis iag:NameOfProperty1Axis
826 Name Of Property [Domain] Member iag:NameOfProperty1Domain
827 Suriname Property Member iag:SurinamePropertyMember
828 Saramacca Project Member iag:SaramaccaPropertyMember
829 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
830 Property, plant and equipment Member ifrs-full:PropertyPlantAndEquipmentMember
831 Exploration and evaluation assets Member ifrs-full:TangibleExplorationAndEvaluationAssetsMember
832 Plan Name1 [Axis] Axis iag:PlanName1Axis
833 Plan Name1 [Domain] Member iag:PlanName1Domain
834 Contingently Issuable Shares to the Government of Suriname Member iag:ContingentlyIssuableSharesToTheGovernmentOfSurinameMember
835 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
836 Assets Concept (Monetary) As Of Debit ifrs-full:Assets
837 Reversal of impairment charges Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLoss
838 Proportion of ownership interest sold in joint venture Concept (Percent) For Period iag:ProportionOfOwnershipInterestSoldInAssociate
839 Number of shares authorised Concept (Shares) As Of iag:NumberOfInstrumentsOrInterestsIssuedOrIssuableRecognizedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
840 Number of shares issued Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfSharesOutstanding
841 Issuance of common shares Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
842 Payments for upward adjustment to resource allocations Concept (Monetary) For Period Credit iag:PaymentOfAdditionalAcquisitionOfExplorationAndEvaluationAssets
843 Upward adjustment to resource allocations, amounts payable Concept (Monetary) As Of Credit iag:ConsiderationPayable
844 Acquired Exploration and evaluation assets Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
845 Shares issued during period, price per share (in dollars per share) Concept (Share) For Period iag:SharesIssuedPricePerShare1
846 Shares issued, closing price measurement period Concept (xbrli:durationItemType) For Period iag:NumberOfInstrumentsOrInterestsIssuedOrIssuableRecognizedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationAwardMeasurementPeriod
847 Payment of finance lease obligations Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfOrdinaryShares
848 2440402 - Disclosure - OTHER NON-CURRENT ASSETS (Details) Network

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 http://www.iamgold.com/role/OtherNonCurrentAssetsDetails
849 Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] Table

*

*

 iag:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
850 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
851 Assets [member] Member ifrs-full:ClassesOfAssetsMember
852 Marketable securities and warrants Member ifrs-full:OtherEquitySecuritiesMember
853 Bond fund investments Member ifrs-full:DebtSecuritiesMember
854 Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] LineItems iag:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
855 Net loan receivable from related party Concept (Monetary) As Of Debit ifrs-full:NoncurrentReceivablesDueFromRelatedParties
856 Marketable securities and warrants and bond fund investments Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
857 Advances for the purchase of capital equipment Concept (Monetary) As Of Debit iag:NonCurrentAssetsAdvanceForFutureCapitalExpenditures
858 Royalty interests Concept (Monetary) As Of Debit iag:NonCurrentRoyaltyInterests
859 Long-term prepayment Concept (Monetary) As Of Debit ifrs-full:NoncurrentPrepayments
860 Derivatives Concept (Monetary) As Of Debit ifrs-full:NoncurrentDerivativeFinancialAssets
861 Other Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentNonfinancialAssets
862 Other assets Concept (Monetary) As Of Debit ifrs-full:OtherNoncurrentAssets
863 2443402 - Disclosure - PROVISIONS (Details) Network

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 http://www.iamgold.com/role/ProvisionsDetails
864 Disclosure of other provisions [table] Table

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 ifrs-full:DisclosureOfOtherProvisionsTable
865 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
866 Other provisions [member] Member ifrs-full:OtherProvisionsMember
867 Asset retirement obligations Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
868 Yatela loss provision1 Member iag:ProvisionsforCumulativeUnrecognizedShareofLossesofAssociatesMember
869 Other Member ifrs-full:MiscellaneousOtherProvisionsMember
870 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
871 Other Provisions, Other Changes Concept (Monetary) For Period Credit iag:OtherProvisionsOtherChanges
872 Other provisions Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
873 Other current provisions Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
874 Non-current provisions Concept (Monetary) As Of Credit ifrs-full:OtherLongtermProvisions
875 Advances Concept (Monetary) For Period ifrs-full:TransfersUnderFinanceAgreementsFromEntityRelatedPartyTransactions
876 Expense of restructuring activities Concept (Monetary) For Period Debit ifrs-full:ExpenseOfRestructuringActivities
877 2443403 - Disclosure - PROVISIONS - Asset Retirement Obligations (Details) Network

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 http://www.iamgold.com/role/ProvisionsAssetRetirementObligationsDetails
878 Disclosure of other provisions [table] Table

*

*

 ifrs-full:DisclosureOfOtherProvisionsTable
879 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
880 Other provisions [member] Member ifrs-full:OtherProvisionsMember
881 Asset retirement obligations Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
882 Guarantor Obligations, Nature [Axis] Axis iag:GuarantorObligationsNatureAxis
883 Guarantor Obligations, Nature [Domain] Member iag:GuarantorObligationsNatureDomain
884 Surety Bond Member iag:SuretyBond1Member
885 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
886 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
887 Disposal Of Interest In Cote Gold Project Member iag:DisposalOfInterestInCoteGoldProjectMember
888 Name of Property [axis] Axis iag:NameOfProperty1Axis
889 Name Of Property [Domain] Member iag:NameOfProperty1Domain
890 Essakane S.A. Member iag:EssakaneS.A.Member
891 Rosebel Gold Mines N.V. Member iag:RosebelGoldMinesN.V.Member
892 Doyon division including the Westwood mine Member iag:DoyonMember
893 Côté Gold Project Member iag:CoteGoldProjectMember
894 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
895 Reconciliation of changes in other provisions [abstract] Abstract ifrs-full:ReconciliationOfChangesInOtherProvisionsAbstract
896 Balance, beginning of the year Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
897 Revision of estimated cash flows and discount rates: Capitalized in property, plant and equipment Concept (Monetary) For Period Credit iag:IncreaseDecreaseThroughChangeInDiscountRateOtherProvisionsPropertyPlantAndEquipment
898 Revision of estimated cash flows and discount rates: Changes in asset retirement obligations at closed sites Concept (Monetary) For Period Credit iag:IncreaseDecreaseThroughChangeInDiscountRateOtherProvisionsChangeInAssetRetirementObligations
899 Sale of 30% interest in the Côté Gold Project Concept (Monetary) For Period Debit ifrs-full:DecreaseThroughLossOfControlOfSubsidiaryOtherProvisions
900 Accretion expense Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTimeValueOfMoneyAdjustmentOtherProvisions
901 Disbursements Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesOtherProvisions
902 Other Provisions, Other Changes Concept (Monetary) For Period Credit iag:OtherProvisionsOtherChanges
903 Balance, end of the year Concept (Monetary) As Of Credit ifrs-full:OtherProvisions
904 Less current portion Concept (Monetary) As Of Credit ifrs-full:OtherShorttermProvisions
905 Non-current portion Concept (Monetary) As Of Credit ifrs-full:OtherLongtermProvisions
906 Outstanding borrowing amount Concept (Monetary) As Of Credit iag:BorrowingsCreditFacilityCommittedAmount
907 Collateral, restricted cash guaranteeing asset retirement obligations Concept (Monetary) As Of Debit ifrs-full:RestrictedCashAndCashEquivalents
908 Uncollateralized surety bonds outstanding to guarantee asset retirement obligations related to the Doyon division Concept (Monetary) As Of Credit iag:FairValueDisclosureOffbalanceSheetRisksAmountLiability1
909 2443404 - Disclosure - PROVISIONS - Future disbursements (Details) Network

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 http://www.iamgold.com/role/ProvisionsFutureDisbursementsDetails
910 Disclosure of other provisions [table] Table

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*

 ifrs-full:DisclosureOfOtherProvisionsTable
911 Forecasted Period [Axis] Axis iag:ForecastedPeriodAxis
912 Forecasted Period [Domain] Member iag:ForecastedPeriodDomain
913 2019 Member ifrs-full:NotLaterThanOneYearMember
914 2020 Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
915 2021 Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
916 2022 Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
917 2023 Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
918 2024 and thereafter Member ifrs-full:LaterThanFiveYearsMember
919 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
920 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
921 Doyon Mine and Other Canadian Sites Member iag:DoyonMineAndOtherCanadianSitesMember
922 Essakane and Rosebel Mines Member iag:EssakaneAndRosebelMinesMember
923 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
924 Undiscounted Amounts required (in CAD and USD) Concept (Monetary) As Of Credit iag:AssetRetirementObligationsUndiscounted
925 2443405 - Disclosure - PROVISIONS - Estimated Undiscounted Amounts Of Cash Flows Required To Settle Obligations (Details) Network

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 http://www.iamgold.com/role/ProvisionsEstimatedUndiscountedAmountsOfCashFlowsRequiredToSettleObligationsDetails
926 Disclosure of other provisions [table] Table

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*

 ifrs-full:DisclosureOfOtherProvisionsTable
927 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
928 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
929 Rosebel Gold Mines N.V. Member iag:RosebelGoldMinesN.V.Member
930 Essakane S.A. Member iag:EssakaneS.A.Member
931 Doyon Member iag:DoyonMember
932 Other Canadian Sites Member iag:OtherCanadianSitesMember
933 Disclosure of other provisions [line items] LineItems ifrs-full:DisclosureOfOtherProvisionsLineItems
934 Undiscounted Amounts required (in CAD and USD) Concept (Monetary) As Of Credit iag:AssetRetirementObligationsUndiscounted
935 Average Real Discount Rates Concept (Percent) For Period iag:AssetRetirementObligationsAverageDiscountRate
936 2446402 - Disclosure - OTHER LIABILITIES (Details) Network

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 http://www.iamgold.com/role/OtherLiabilitiesDetails
937 Implied Table Table

*

*

 implied:Table
938 Subclassifications of assets, liabilities and equities [abstract] Abstract ifrs-full:SubclassificationsOfAssetsLiabilitiesAndEquitiesAbstract
939 Finance lease liabilities Concept (Monetary) As Of Credit ifrs-full:FinanceLeaseLiabilities
940 Derivatives Concept (Monetary) As Of Credit ifrs-full:DerivativeFinancialLiabilities
941 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNonfinancialLiabilities
942 Total other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherLiabilities
943 Current portion of other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
944 Non-current portion of other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
945 2449402 - Disclosure - INCOME TAXES - Narrative (Details) Network

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 http://www.iamgold.com/role/IncomeTaxesNarrativeDetails
946 Implied Table Table

*

*

 implied:Table
947 Income Taxes [Abstract] Abstract iag:IncomeTaxesAbstract
948 Average effective tax rate Concept (Percent) For Period ifrs-full:AverageEffectiveTaxRate
949 Applicable tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
950 2449403 - Disclosure - INCOME TAXES - Components of Income Tax Expense (Details) Network

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 http://www.iamgold.com/role/IncomeTaxesComponentsOfIncomeTaxExpenseDetails
951 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
952 Income Tax Authority [Axis] Axis iag:IncomeTaxAuthority1Axis
953 Income Tax Authority [Domain] Member iag:IncomeTaxAuthority1Domain
954 Domestic Country Member iag:DomesticCountry1Member
955 Foreign Country Member iag:ForeignCountry1Member
956 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
957 Current income tax Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
958 Deferred income tax - origination and reversal of temporary differences Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences
959 Changes in tax rates or imposition of new taxes Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToTaxRateChangesOrImpositionOfNewTaxes
960 Deferred income tax Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncome
961 Total income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
962 2449404 - Disclosure - INCOME TAXES - Reconciliation Of Income Taxes (Details) Network

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 http://www.iamgold.com/role/IncomeTaxesReconciliationOfIncomeTaxesDetails
963 Implied Table Table

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*

 implied:Table
964 Income Taxes [Abstract] Abstract iag:IncomeTaxesAbstract
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966 Income tax provision - 26.6% (26.6% in 2017) Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
967 Increase (reduction) in income taxes resulting from: Abstract ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeAbstract
968 Earnings in foreign jurisdictions subject to a different tax rate than 26.6% Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
969 Permanent items that are not included in income / losses for tax purposes: Abstract iag:IncomeTaxesPermanentItemsNotIncludedInIncomeLossesAbstract
970 Non-deductible expenses Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
971 Losses not recognized for tax purposes Concept (Monetary) For Period Credit ifrs-full:TaxEffectOfRevenuesExemptFromTaxation2011
972 Tax provisions not based on legal entity income or losses for the year: Abstract iag:TaxProvisionsNotBasedOnIncomeLossDuringThePeriodAbstract
973 Provincial mining duty tax Concept (Monetary) For Period Debit iag:TaxEffectOfProvincialMiningDutyTax
974 Non-resident withholding tax Concept (Monetary) For Period Debit iag:TaxEffectOfNonResidentWithholdingTax
975 Under/(over) tax provisions Concept (Monetary) For Period Debit iag:TaxEffectOfUnderOverTaxProvisions
976 Changes in tax rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
977 Other Concept (Monetary) For Period Debit iag:OtherTaxAdjustmentsForReconciliationBetweenAccountingProfitAndTaxExpenseBenefit
978 Other adjustments: Abstract iag:IncomeTaxesOtherAdjustmentsAbstract
979 Unrecognized recoveries (expenses) in deferred tax provisions Concept (Monetary) For Period Credit iag:TaxEffectOfPreviouslyUnrecognizedTaxLossTaxCreditOrTemporaryDifferenceOfPriorPeriodUsedToReduceDeferredTaxExpense
980 Foreign exchange related to deferred income taxes Concept (Monetary) For Period Credit iag:TaxEffectOfForeignExchangeRelatedToDeferredIncomeTaxes
981 Other Concept (Monetary) For Period Debit ifrs-full:OtherTaxEffectsForReconciliationBetweenAccountingProfitAndTaxExpenseIncome
982 Total income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
983 2449405 - Disclosure - INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) Network

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 http://www.iamgold.com/role/IncomeTaxesDeferredIncomeTaxAssetsAndLiabilitiesDetails
984 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
985 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
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989 Asset retirement obligations Member iag:AssetRetirementObligationsMember
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991 Property, plant and equipment Member ifrs-full:PropertyPlantAndEquipmentMember
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993 Other intangible assets Member ifrs-full:OtherIntangibleAssetsMember
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996 Inventory and Reserves Member iag:InventoryAndReservesMember
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1000 After Offset Amount, Offset Amount And Before Offset Amount [Domain] Member iag:AfterOffsetAmountOffsetAmountAndBeforeOffsetAmountDomain
1001 Before Offset Amount Member iag:BeforeOffsetAmountMember
1002 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
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1004 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
1005 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
1006 Net deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1007 Deductible temporary differences for which no deferred tax asset is recognised Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
1008 2449406 - Disclosure - INCOME TAXES - Changes to OCI (Details) Network

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 http://www.iamgold.com/role/IncomeTaxesChangesToOciDetails
1009 Implied Table Table

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 implied:Table
1010 Income Taxes [Abstract] Abstract iag:IncomeTaxesAbstract
1011 Unrealized change in fair value of marketable securities Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToAvailableforsaleFinancialAssetsOfOtherComprehensiveIncome
1012 Hedges Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome
1013 Total income taxes related to OCI Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
1014 2449407 - Disclosure - INCOME TAXES - Total Unrecognized Losses (Details) Network

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 http://www.iamgold.com/role/IncomeTaxesTotalUnrecognizedLossesDetails
1015 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1016 Tax Loss Carryforward Expiration Period Axis [Axis] Axis iag:TaxLossCarryforwardExpirationPeriodAxis
1017 Tax Loss Carryforward Expiration Period Axis [Domain] Member iag:TaxLossCarryforwardExpirationPeriodAxisDomain
1018 2019 Member ifrs-full:NotLaterThanOneYearMember
1019 2020 Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1020 2021 Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
1021 2022 Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
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1025 Unused tax losses for which no deferred tax asset recognised Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
1026 Deferred income tax liability not recognized Concept (Monetary) As Of ifrs-full:TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures
1027 2449408 - Disclosure - INCOME TAXES - Deferred Tax Liabilities (Details) Network

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 http://www.iamgold.com/role/IncomeTaxesDeferredTaxLiabilitiesDetails
1028 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

*

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 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
1029 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
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1033 Asset retirement obligations Member iag:AssetRetirementObligationsMember
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1045 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
1046 Net deferred income tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
1047 Deferred tax income (expense) recognised in profit or loss Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
1048 Income tax relating to components of other comprehensive income Concept (Monetary) For Period ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome
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1050 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
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1053 2452402 - Disclosure - LONG-TERM DEBT AND CREDIT FACILITIES - Senior Notes (Details) Network

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*

 http://www.iamgold.com/role/LongTermDebtAndCreditFacilitiesSeniorNotesDetails
1054 Disclosure of detailed information about borrowings [table] Table

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*

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1085 2452403 - Disclosure - LONG-TERM DEBT AND CREDIT FACILITIES - Schedule of Contractual Maturities (Details) Network

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*

 http://www.iamgold.com/role/LongTermDebtAndCreditFacilitiesScheduleOfContractualMaturitiesDetails
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*

*

 ifrs-full:DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable
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1099 Unamortized Deferred Transactions Costs Member iag:UnamortizedDeferredTransactionsCostsMember
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1101 Carrying amount Concept (Monetary) As Of Credit ifrs-full:Borrowings
1102 Contractual cash flows Concept (Monetary) As Of Credit ifrs-full:BankBorrowingsUndiscountedCashFlows
1103 Borrowing costs capitalised Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
1104 2452404 - Disclosure - LONG-TERM DEBT AND CREDIT FACILITIES - 6.75% Senior Notes (Details) Network

*

*

 http://www.iamgold.com/role/LongTermDebtAndCreditFacilities675SeniorNotesDetails
1105 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
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1119 2452405 - Disclosure - LONG-TERM DEBT AND CREDIT FACILITIES - Credit Facilities (Details) Network

*

*

 http://www.iamgold.com/role/LongTermDebtAndCreditFacilitiesCreditFacilitiesDetails
1120 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
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1132 2452406 - Disclosure - LONG-TERM DEBT AND CREDIT FACILITIES - Uncollateralized Surety Bonds (Details) Network

*

*

 http://www.iamgold.com/role/LongTermDebtAndCreditFacilitiesUncollateralizedSuretyBondsDetails
1133 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
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1139 2455402 - Disclosure - FINANCIAL INSTRUMENTS - Narrative (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsNarrativeDetails
1140 Disclosure of detailed information about financial instruments [table] Table

*

*

 ifrs-full:DisclosureOfFinancialInstrumentsTable
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1147 Senior Notes at 6.75% Member iag:SixPointSevenFivePercentSeniorUnsecuredNotesDue2020Member
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1150 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
1151 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
1152 Carrying amount Concept (Monetary) As Of Credit ifrs-full:Borrowings
1153 2455403 - Disclosure - FINANCIAL INSTRUMENTS - Marketable Securities (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsMarketableSecuritiesDetails
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*

*

 implied:Table
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1159 2455404 - Disclosure - FINANCIAL INSTRUMENTS - Cash Flow Hedge Fair Value Reserve (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsCashFlowHedgeFairValueReserveDetails
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*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
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1173 Gain (loss) recognized in cash flow hedge reserve, time value of options contracts excluded from hedge relationship Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnChangeInValueOfTimeValueOfOptionsBeforeTax
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1179 2455405 - Disclosure - FINANCIAL INSTRUMENTS - Cash Flow Reclassification of Gain (Loss) (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsCashFlowReclassificationOfGainLossDetails
1180 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
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1188 (Gain) loss reclassified or adjusted from cash flow hedge reserve Concept (Monetary) For Period Debit iag:ReclassificationAdjustmentsOnCashFlowHedgesIncludingAmountsRemovedFromEquityAndIncludedInCarryingAmountOfNonFinancialAssetLiabilityBeforeTax
1189 2455406 - Disclosure - FINANCIAL INSTRUMENTS - Currency Exchange Rate Derivative Contracts (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsCurrencyExchangeRateDerivativeContractsDetails
1190 Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [table] Table

*

*

 ifrs-full:DisclosureOfInformationAboutTermsAndConditionsOfHedgingInstrumentsAndHowTheyAffectFutureCashFlowsTable
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1215 2455407 - Disclosure - FINANCIAL INSTRUMENTS - Currency Exchange Risk (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsCurrencyExchangeRiskDetails
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*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
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1236 Fair value changes used for calculating hedge ineffectiveness, Hedged items Concept (Monetary) For Period Credit ifrs-full:GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness
1237 2455408 - Disclosure - FINANCIAL INSTRUMENTS - Crude Oil Derivative Contracts (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsCrudeOilDerivativeContractsDetails
1238 Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [table] Table

*

*

 ifrs-full:DisclosureOfInformationAboutTermsAndConditionsOfHedgingInstrumentsAndHowTheyAffectFutureCashFlowsTable
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1259 Option contracts with strike prices at (USD/barrel) Concept (Decimal) As Of ifrs-full:AveragePriceOfHedgingInstrument
1260 2455409 - Disclosure - FINANCIAL INSTRUMENTS - Oil and Fuel Market Price Risk (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsOilAndFuelMarketPriceRiskDetails
1261 Disclosure of detailed information about hedging instruments [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutHedgingInstrumentsTable
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1275 Decrease of 10%, Sensitivity analysis Concept (Monetary) For Period Credit iag:SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableImpactOnEquityDecreaseOfTenPercent
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1277 Carrying amount, Liabilities Concept (Monetary) As Of Credit ifrs-full:HedgingInstrumentLiabilities
1278 Accumulated cash flow hedge fair value reserve (before tax) Concept (Monetary) As Of Credit ifrs-full:ReserveOfCashFlowHedgesContinuingHedges
1279 Fair value changes used for calculating hedge ineffectiveness, Hedging instruments Concept (Monetary) For Period Credit ifrs-full:GainLossOnChangeInFairValueOfHedgingInstrumentUsedAsBasisForRecognisingHedgeIneffectiveness
1280 Fair value changes used for calculating hedge ineffectiveness, Hedged items Concept (Monetary) For Period Credit ifrs-full:GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness
1281 2455410 - Disclosure - FINANCIAL INSTRUMENTS - Gain (Loss) on Non-Hedge Derivatives and Warrants (Details) Network

*

*

 http://www.iamgold.com/role/FinancialInstrumentsGainLossOnNonHedgeDerivativesAndWarrantsDetails
1282 Disclosure of maturity analysis for derivative financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable
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1288 Warrants Concept (Monetary) For Period Credit ifrs-full:TradingIncomeExpenseOnEquityInstruments
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1290 2458402 - Disclosure - FAIR VALUE MEASUREMENTS - Financial Assets and Liabilities Measured at Fair Value (Details) Network

*

*

 http://www.iamgold.com/role/FairValueMeasurementsFinancialAssetsAndLiabilitiesMeasuredAtFairValueDetails
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*

*

 iag:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
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1316 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1317 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1318 Fixed interest rate Member ifrs-full:FixedInterestRateMember
1319 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1320 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1321 7.0% Senior Notes Member iag:SevenPercentSeniorSecuredNotesDue2025Member
1322 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1323 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1324 Unamortized Deferred Transactions Costs Member iag:UnamortizedDeferredTransactionsCostsMember
1325 Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] LineItems iag:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
1326 Assets Concept (Monetary) As Of Debit ifrs-full:Assets
1327 Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1328 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1329 Borrowing costs capitalised Concept (Monetary) For Period ifrs-full:BorrowingCostsCapitalised
1330 2458403 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details) Network

*

*

 http://www.iamgold.com/role/FairValueMeasurementsNarrativeDetails
1331 Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] Table

*

*

 iag:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable
1332 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
1333 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
1334 Level 3 Member ifrs-full:Level3OfFairValueHierarchyMember
1335 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1336 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1337 Marketable securities and warrants Member ifrs-full:OtherEquitySecuritiesMember
1338 Embedded derivative Member iag:EmbeddedDerivativeFinancialInstruments1Member
1339 Measurement [axis] Axis ifrs-full:MeasurementAxis
1340 Aggregated measurement [member] Member ifrs-full:AggregatedMeasurementMember
1341 Recurring fair value measurement Member ifrs-full:RecurringFairValueMeasurementMember
1342 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
1343 Liabilities [member] Member ifrs-full:LiabilitiesMember
1344 Long-term debt Member ifrs-full:LongtermBorrowingsMember
1345 Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] LineItems iag:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
1346 Marketable securities included in level 3 Abstract ifrs-full:ReconciliationOfChangesInFairValueMeasurementEntitysOwnEquityInstrumentsAbstract
1347 Balance, December 31, 2017 Concept (Monetary) As Of Debit ifrs-full:Assets
1348 Shares received Concept (Monetary) For Period Credit ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities
1349 Change in fair value reported in Other comprehensive income, net of income taxes Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments
1350 Balance, December 31, 2018 Concept (Monetary) As Of Debit ifrs-full:Assets
1351 Assets Concept (Monetary) As Of Debit ifrs-full:Assets
1352 Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1353 2461402 - Disclosure - CAPITAL MANAGEMENT (Details) Network

*

*

 http://www.iamgold.com/role/CapitalManagementDetails
1354 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1355 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1356 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1357 7.0% Senior Notes Member iag:SevenPercentSeniorSecuredNotesDue2025Member
1358 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
1359 Carrying amount [member] Member ifrs-full:CarryingAmountMember
1360 Unamortized Deferred Transactions Costs Member iag:UnamortizedDeferredTransactionsCostsMember
1361 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1362 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1363 Short-term investments Concept (Monetary) As Of Debit ifrs-full:ShorttermInvestmentsClassifiedAsCashEquivalents
1364 Cash and cash equivalents including short-term investments Concept (Monetary) As Of Debit iag:CashAndCashEquivalentsIncludingShortTermInvestments
1365 Credit facility available for use Concept (Monetary) As Of Credit iag:LineOfCreditFacilityRemainingBorrowingCapacity1
1366 Long-term debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1367 Common shares Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
1368 Capital Management Liabilities And Equity Concept (Monetary) As Of Credit iag:CapitalManagementLiabilitiesAndEquity
1369 Unamortized deferred transaction costs Concept (Monetary) For Period Debit iag:UnamortizedDebtIssuanceCosts
1370 2464402 - Disclosure - SHARE CAPITAL - ROLLFORWARD OF COMMON SHARES (Details) Network

*

*

 http://www.iamgold.com/role/ShareCapitalRollforwardOfCommonSharesDetails
1371 Disclosure of classes of share capital [table] Table

*

*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
1372 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
1373 Equity Member ifrs-full:EquityMember
1374 Common shares Member ifrs-full:IssuedCapitalMember
1375 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
1376 Reconciliation of number of shares outstanding [abstract] Abstract ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
1377 Outstanding, beginning of the year Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
1378 Equity issuance Concept (Shares) For Period iag:NumberofSharesIssuedinAssetAcquisition
1379 Issuance of flow-through common shares Concept (Shares) For Period iag:NumberofFlowThroughOrdinarySharesIssued
1380 Issuance of shares for share-based compensation Concept (Shares) For Period iag:NumberOfShareAwardsExercisedInShareBasedPaymentArrangements
1381 Outstanding, end of the year Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
1382 2464403 - Disclosure - SHARE CAPITAL (Details) Network

*

*

 http://www.iamgold.com/role/ShareCapitalDetails
1383 Disclosure of classes of share capital [table] Table

*

*

 ifrs-full:DisclosureOfClassesOfShareCapitalTable
1384 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
1385 Equity Member ifrs-full:EquityMember
1386 Common shares Member ifrs-full:IssuedCapitalMember
1387 Sale Of Stock [Axis] Axis iag:SaleOfStockAxis
1388 Sale Of Stock [Domain] Member iag:SaleOfStockDomain
1389 Flow-through shares issued to fund expenditures on Westwood Mine, March 2017 Member iag:FlowThroughSharesIssuedToFundExpendituresOnWestwoodMineMarch2017Member
1390 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
1391 Property, plant and equipment Member ifrs-full:PropertyPlantAndEquipmentMember
1392 Exploration and evaluation assets Member ifrs-full:TangibleExplorationAndEvaluationAssetsMember
1393 Plan Name1 [Axis] Axis iag:PlanName1Axis
1394 Plan Name1 [Domain] Member iag:PlanName1Domain
1395 Contingently Issuable Shares to the Government of Suriname Member iag:ContingentlyIssuableSharesToTheGovernmentOfSurinameMember
1396 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
1397 Issuance of flow-through common shares (in shares) Concept (Shares) For Period iag:NumberofFlowThroughOrdinarySharesIssued
1398 Shares issued during period, price per share (in CAD and dollars per share) Concept (Share) For Period iag:SharesIssuedPricePerShare1
1399 Payment of rights to the Saramacca property Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfOrdinaryShares
1400 Other liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
1401 Common shares Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
1402 Unspent portion Concept (Monetary) As Of Credit iag:FairValueDisclosureOffbalanceSheetRisksAmountLiability1
1403 Amortization of gains related to flow-through common shares Concept (Monetary) For Period Credit iag:AmortizationOfGainsOnFlowThroughOrdinaryShares
1404 Payments for exploration and evaluation expenses Concept (Monetary) For Period Credit ifrs-full:PurchaseOfExplorationAndEvaluationAssets
1405 Contingently issuable consideration for purchase of exploration and evaluation rights (in shares) Concept (Shares) For Period iag:PropertyPlantAndEquipmentContingentConsiderationShares
1406 Number of tranches for delivery of contingently issuable consideration Concept (Integer) For Period iag:PropertyPlantAndEquipmentContingentlyIssuableConsiderationNumberOfTranchesForDeliveryOfShares
1407 Contingently issuable consideration, tranche intervals Concept (xbrli:durationItemType) For Period iag:PropertyPlantAndEquipmentContingentlyIssuableConsiderationTrancheIntervals
1408 Measurement period for upward adjustment of purchase price Concept (xbrli:durationItemType) For Period iag:PropertyPlantAndEquipmentContingentlyIssuableConsiderationMeasurementPeriodForUpwardAdjustmentOfPurchasePrice
1409 Maximum upward adjustment to purchase price Concept (Monetary) For Period Credit iag:PropertyPlantAndEquipmentContingentlyIssuableConsiderationMaximumUpwardAdjustmentToPurchasePrice
1410 Agreement termination notification period Concept (xbrli:durationItemType) For Period iag:PropertyPlantAndEquipmentContingentlyIssuableConsiderationAgreementTerminationNotificationPeriod
1411 Number of shares authorised Concept (Shares) As Of iag:NumberOfInstrumentsOrInterestsIssuedOrIssuableRecognizedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination
1412 Number of shares issued Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfSharesOutstanding
1413 Value of shares issued during the period Concept (Monetary) For Period Credit iag:StockIssuedDuringPeriodValueNewIssues1
1414 Shares issued, closing price measurement period Concept (xbrli:durationItemType) For Period iag:NumberOfInstrumentsOrInterestsIssuedOrIssuableRecognizedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationAwardMeasurementPeriod
1415 2467402 - Disclosure - NON-CONTROLLING INTERESTS (Details) Network

*

*

 http://www.iamgold.com/role/NonControllingInterestsDetails
1416 Disclosure of subsidiaries [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1417 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1418 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1419 Essakane S.A. Member iag:EssakaneS.A.Member
1420 Rosebel Gold Mines N.V. Member iag:RosebelGoldMinesN.V.Member
1421 Subsidiaries with material non-controlling interests Member iag:SubsidiariesWithNonmaterialNoncontrollingInterestsMember
1422 Disclosure of consolidated [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1423 Percentage of voting rights held by non-controlling interests Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
1424 Accumulated non-controlling interest Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
1425 Net earnings attributable to non-controlling interests Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
1426 Dividends paid to material non-controlling interests Concept (Monetary) For Period Credit ifrs-full:DividendsPaidToNoncontrollingInterests
1427 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
1428 Total non- current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1429 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1430 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
1431 Share of net assets (liabilities) of joint ventures Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
1432 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
1433 Net earnings and other comprehensive income Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
1434 Net cash from operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
1435 Net cash used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
1436 Net cash used in financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
1437 Increase (decrease) in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
1438 2470402 - Disclosure - EARNINGS PER SHARE - Earnings (loss) per share computations (Details) Network

*

*

 http://www.iamgold.com/role/EarningsPerShareEarningsLossPerShareComputationsDetails
1439 Implied Table Table

*

*

 implied:Table
1440 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
1441 Numerator Abstract ifrs-full:BasicEarningsPerShareAbstract
1442 Net earnings (loss) attributable to equity holders of IAMGOLD Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
1443 Denominator Abstract ifrs-full:DilutedEarningsPerShareAbstract
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1445 Basic earnings attributable to equity holders of IAMGOLD (in dollars per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
1446 Dilutive effect of share options Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
1447 Dilutive effect of full value award units Concept (Shares) For Period iag:DilutiveEffectOfShareOptionsOnNumberOfRestrictedStockUnits
1448 Weighted average number of common shares (diluted) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
1449 Diluted earnings attributable to equity holders of IAMGOLD (in dollars per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
1450 2470403 - Disclosure - EARNINGS PER SHARE - Antidilutive Securities (Details) Network

*

*

 http://www.iamgold.com/role/EarningsPerShareAntidilutiveSecuritiesDetails
1451 Earnings per share [table] Table

*

*

 ifrs-full:EarningsPerShareTable
1452 Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities1 [Axis] Axis iag:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities1Axis
1453 Antidilutive Securities, Name [Domain] Member iag:AntidilutiveSecuritiesName1Domain
1454 Share options Member iag:EmployeeStockOption1Member
1455 Full value awards Member iag:RestrictedStockOption1Member
1456 Contingently issuable shares Member iag:ContingentlyIssuableSharesMember
1457 Earnings per share [line items] LineItems ifrs-full:EarningsPerShareLineItems
1458 Antidilutive securities Concept (Shares) For Period iag:AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareAmount1
1459 2473402 - Disclosure - SHARE-BASED COMPENSATION - Share-based Compensation Plans (Details) Network

*

*

 http://www.iamgold.com/role/ShareBasedCompensationShareBasedCompensationPlansDetails
1460 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1461 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1462 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1463 Share Options Member iag:ShareOptions1Member
1464 Restricted, Performance and Deferred Share Units Member iag:RestrictedPerformanceAndDeferredShareUnitsMember
1465 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1466 Value of share-based payment arrangements Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
1467 2473403 - Disclosure - SHARE-BASED COMPENSATION - Narrative (Details) Network

*

*

 http://www.iamgold.com/role/ShareBasedCompensationNarrativeDetails
1468 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1469 Range [axis] Axis ifrs-full:RangeAxis
1470 Ranges [member] Member ifrs-full:RangesMember
1471 Bottom of range Member ifrs-full:BottomOfRangeMember
1472 Top of range Member ifrs-full:TopOfRangeMember
1473 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1474 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1475 Share Options Member iag:ShareOptions1Member
1476 Restricted, Performance and Deferred Share Units Member iag:RestrictedPerformanceAndDeferredShareUnitsMember
1477 Restricted Share Units Member iag:RestrictedShareUnitsMember
1478 Employee Share Purchase Plan Member iag:EmployeeSharePurchasePlanMember
1479 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1480 Vesting period Concept (xbrli:durationItemType) For Period iag:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod2
1481 Expiration period Concept (xbrli:durationItemType) For Period iag:SharebasedCompensationArrangementbySharebasedPaymentAwardExpirationPeriod1
1482 Maximum allotment of common shares reserved in share-based payment arrangement (in shares) Concept (Shares) As Of iag:SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAuthorized1
1483 Common shares in reserve in share-based payment arrangement (in shares) Concept (Shares) As Of iag:CommonStockCapitalSharesReservedforFutureIssuance1
1484 Number of share options outstanding in share-based payment arrangement (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1485 Common shares unallocated in reserve in share-based payment arrangement (in shares) Concept (Shares) As Of iag:SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAvailableforGrant1
1486 Number of other equity instruments outstanding in share-based payment arrangement (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1487 Required employee service period Concept (xbrli:durationItemType) For Period iag:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod2
1488 Employee contribution, percentage of base salary Concept (Percent) As Of iag:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate1
1489 Company's matching percentage Concept (Percent) For Period iag:ShareBasedPaymentArrangementEmployerMatchingContributionPercentofMatch
1490 Percentage of employee contribution that company will match Concept (Percent) For Period iag:ShareBasedPaymentArrangementEmployerMatchingContributionPercentofEmployeeContributions
1491 Maximum percentage company will match Concept (Percent) For Period iag:ShareBasedPaymentArrangementEmployerMatchingContributionPercentofEmployeesGrossPay
1492 2473404 - Disclosure - SHARE-BASED COMPENSATION - Share Option Award Plan (Details) Network

*

*

 http://www.iamgold.com/role/ShareBasedCompensationShareOptionAwardPlanDetails
1493 Implied Table Table

*

*

 implied:Table
1494 Share-Based Payment Arrangements [Abstract] Abstract iag:ShareBasedPaymentArrangementsAbstract
1495 Outstanding, beginning of the period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1496 Granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
1497 Exercised (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
1498 Forfeited and expired (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
1499 Outstanding, end of the period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1500 Exercisable, end of the period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
1501 Outstanding, beginning of the period (C$ per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1502 Granted (C$ per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
1503 Exercised (C$ per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
1504 Forfeited and expired (C$ per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
1505 Outstanding, end of the period (C$ per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1506 Exercisable, end of the period (C$ per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
1507 Closing foreign exchange rate Concept (Decimal) As Of ifrs-full:ClosingForeignExchangeRate
1508 2473405 - Disclosure - SHARE-BASED COMPENSATION - Information Related to Share Options Outstanding (Details) Network

*

*

 http://www.iamgold.com/role/ShareBasedCompensationInformationRelatedToShareOptionsOutstandingDetails
1509 Disclosure of range of exercise prices of outstanding share options [table] Table

*

*

 ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable
1510 Range [axis] Axis ifrs-full:RangeAxis
1511 Ranges [member] Member ifrs-full:RangesMember
1512 Bottom of range Member ifrs-full:BottomOfRangeMember
1513 Top of range Member ifrs-full:TopOfRangeMember
1514 Ranges of exercise prices for outstanding share options [axis] Axis ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis
1515 Ranges of exercise prices for outstanding share options [member] Member ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember
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1517 5.01 - 10.00 Member iag:ExercisePriceRangeTwoMember
1518 10.01 - 15.00 Member iag:ExercisePriceRangeThreeMember
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1520 Exercise price of outstanding share options (C$/share) Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
1521 Number of share options outstanding in share-based payment arrangement (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
1522 Weighted Average Remaining Contractual Life (years) Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
1523 Weighted Average Exercise Price (C$/share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
1524 2473406 - Disclosure - SHARE-BASED COMPENSATION - Stock Options Fair Value Inputs (Details) Network

*

*

 http://www.iamgold.com/role/ShareBasedCompensationStockOptionsFairValueInputsDetails
1525 Statement of changes in equity [table] Table

*

*

 ifrs-full:StatementOfChangesInEquityTable
1526 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
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1528 Share options Member iag:EmployeeStockOption1Member
1529 Deferred share units Member iag:DeferredShareUnitsMember
1530 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
1531 Weighted average risk-free interest rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
1532 Weighted average expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
1533 Weighted average dividend yield Concept (Percent) For Period ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted
1534 Weighted average expected life of options issued (years) Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
1535 Weighted average grant-date fair value (C$ per share) Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
1536 Weighted average share price at grant date (C$ per share) Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
1537 Weighted average exercise price (C$ per share) Concept (Monetary) For Period ifrs-full:ExercisePriceShareOptionsGranted
1538 2473407 - Disclosure - SHARE-BASED COMPENSATION - Full Value Award Plans (Details) Network

*

*

 http://www.iamgold.com/role/ShareBasedCompensationFullValueAwardPlansDetails
1539 Implied Table Table

*

*

 implied:Table
1540 Share-Based Payment Arrangements [Abstract] Abstract iag:ShareBasedPaymentArrangementsAbstract
1541 Outstanding, beginning of the period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1542 Granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1543 Issued (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1544 Forfeited (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1545 Outstanding, end of the period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1546 2473408 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Units Fair Value Inputs (Details) Network

*

*

 http://www.iamgold.com/role/ShareBasedCompensationRestrictedStockUnitsFairValueInputsDetails
1547 Implied Table Table

*

*

 implied:Table
1548 Share-Based Payment Arrangements [Abstract] Abstract iag:ShareBasedPaymentArrangementsAbstract
1549 Weighted average risk-free interest rate Concept (Percent) For Period iag:RiskFreeInterestRateOtherEquityInstrumentsGranted
1550 Weighted average expected volatility Concept (Percent) For Period iag:ExpectedVolatilityOtherEquityInstrumentsGranted
1551 Weighted average dividend yield Concept (Percent) For Period iag:ExpectedDividendAsPercentageOtherEquityInstrumentsGranted
1552 Weighted average expected life of RSUs issued (years) Concept (Decimal) For Period iag:OtherEquityInstrumentsLifeOtherEquityInstrumentsGranted
1553 Weighted average grant-date fair value (C$ per share) Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1554 Weighted average share price at grant date (C$ per share) Concept (Monetary) For Period Credit iag:WeightedAverageSharePriceOtherEquityInstrumentsGranted
1555 2476402 - Disclosure - COST OF SALES (Details) Network

*

*

 http://www.iamgold.com/role/CostOfSalesDetails
1556 Implied Table Table

*

*

 implied:Table
1557 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1558 Operating costs Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
1559 Royalties Concept (Monetary) For Period Debit ifrs-full:RoyaltyExpense
1560 Depreciation expense Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
1561 Cost of sales Concept (Monetary) For Period Debit ifrs-full:CostOfSales
1562 2479402 - Disclosure - GENERAL AND ADMINSTRATIVE EXPENSES (Details) Network

*

*

 http://www.iamgold.com/role/GeneralAndAdminstrativeExpensesDetails
1563 Implied Table Table

*

*

 implied:Table
1564 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1565 Salaries Concept (Monetary) For Period Debit ifrs-full:WagesAndSalaries
1566 Director fees and expenses Concept (Monetary) For Period Debit iag:DirectorFeesandExpenses
1567 Professional and consulting fees Concept (Monetary) For Period Debit ifrs-full:ProfessionalFeesExpense
1568 Other administration costs Concept (Monetary) For Period Debit iag:OtherAdministrationExpenses
1569 Share-based compensation Concept (Monetary) For Period Debit iag:GeneralAndAdministrativeExpenseShareBasedCompensation
1570 Gain on cash flow hedge Concept (Monetary) For Period Debit ifrs-full:LossesOnChangeInFairValueOfDerivatives
1571 Depreciation expense Concept (Monetary) For Period Debit iag:GeneralAndAdministrativeExpenseDepreciation
1572 General and administrative Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
1573 2482402 - Disclosure - OTHER EXPENSES (Details) Network

*

*

 http://www.iamgold.com/role/OtherExpensesDetails
1574 Implied Table Table

*

*

 implied:Table
1575 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1576 Changes in asset retirement obligations at closed sites Concept (Monetary) For Period Credit iag:ChangesInAssetRetirementObligations
1577 Write-down of assets Concept (Monetary) For Period Debit ifrs-full:LossesOnDisposalsOfNoncurrentAssets
1578 Other Concept (Monetary) For Period Debit iag:MiscellaneousOtherExpensesIncome
1579 Other expenses (income) Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
1580 2483402 - Disclosure - FINANCE COSTS (Details) Network

*

*

 http://www.iamgold.com/role/FinanceCostsDetails
1581 Implied Table Table

*

*

 implied:Table
1582 Borrowing costs [abstract] Abstract ifrs-full:BorrowingCostsAbstract
1583 Interest expense Concept (Monetary) For Period Debit ifrs-full:InterestExpense
1584 Credit facility fees Concept (Monetary) For Period Debit ifrs-full:BorrowingCostsRecognisedAsExpense
1585 Accretion expense Concept (Monetary) For Period Debit iag:AccretionExpense1
1586 Finance costs Concept (Monetary) For Period Debit ifrs-full:FinanceCosts
1587 Interest paid Concept (Monetary) For Period Credit iag:InterestPaid1
1588 2484402 - Disclosure - INTEREST INCOME, DERIVATIVES AND OTHER INVESTMENT GAINS (LOSSES) (Details) Network

*

*

 http://www.iamgold.com/role/InterestIncomeDerivativesAndOtherInvestmentGainsLossesDetails
1589 Investment [Table] Table

*

*

 invest:InvestmentTable
1590 Continuing and discontinued operations [axis] Axis ifrs-full:ContinuingAndDiscontinuedOperationsAxis
1591 Aggregate continuing and discontinued operations [member] Member ifrs-full:AggregateContinuingAndDiscontinuedOperationsMember
1592 Disposal Of Interest In Cote Gold Project Member iag:DisposalOfInterestInCoteGoldProjectMember
1593 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1594 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1595 Senior Notes at 6.75% Member iag:SixPointSevenFivePercentSeniorUnsecuredNotesDue2020Member
1596 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1597 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1598 Fixed interest rate Member ifrs-full:FixedInterestRateMember
1599 Investment [Line Items] LineItems invest:InvestmentLineItems
1600 Proportion of ownership interest sold in joint venture Concept (Percent) For Period iag:ProportionOfOwnershipInterestSoldInAssociate
1601 Interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1602 2485402 - Disclosure - EXPENSES BY NATURE (Details) Network

*

*

 http://www.iamgold.com/role/ExpensesByNatureDetails
1603 Implied Table Table

*

*

 implied:Table
1604 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1605 Salaries, short-term incentives, and other benefits Concept (Monetary) For Period Debit ifrs-full:ShorttermEmployeeBenefitsExpense
1606 Share-based compensation Concept (Monetary) For Period Debit iag:ShareBasedCompensationExpenseByNature
1607 Other Concept (Monetary) For Period Debit iag:MiscellaneousOtherExpensesByNature
1608 Expenses, by nature Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
1609 2486402 - Disclosure - CASH FLOW ITEMS - Other Non-Cash Items, Operating Activities (Details) Network

*

*

 http://www.iamgold.com/role/CashFlowItemsOtherNonCashItemsOperatingActivitiesDetails
1610 Implied Table Table

*

*

 implied:Table
1611 Cash Flow Statement [Abstract] Abstract iag:CashFlowStatementAbstract
1612 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
1613 Effects of exchange rate fluctuation on restricted cash Concept (Monetary) For Period Credit iag:AdjustmentsForEffectOfExchangeRateChangesOnRestrictedCashAndCashEquivalentsOperating
1614 Amortization of gains related to flow-through common shares Concept (Monetary) For Period Credit iag:AmortizationOfGainsOnFlowThroughOrdinaryShares
1615 Changes in estimates of environmental indemnities at closed sites Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForProvisions
1616 Other Concept (Monetary) For Period Debit iag:MiscellaneousOtherAdjustmentsForNonCashItems
1617 Total adjustments for other non-cash items within operating activities Concept (Monetary) For Period Debit ifrs-full:OtherAdjustmentsForNoncashItems
1618 2486403 - Disclosure - CASH FLOW ITEMS - Changes in Non-Cash Working Capital Items and Non-Current Ore Stockpiles (Details) Network

*

*

 http://www.iamgold.com/role/CashFlowItemsChangesInNonCashWorkingCapitalItemsAndNonCurrentOreStockpilesDetails
1619 Implied Table Table

*

*

 implied:Table
1620 Cash Flow Statement [Abstract] Abstract iag:CashFlowStatementAbstract
1621 Receivables and other current assets Concept (Monetary) For Period Debit iag:AdjustmentsForDecreaseIncreaseInTradeandOtherReceivablesandOtherCurrentAssets
1622 Inventories and non-current ore stockpiles Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
1623 Accounts payable and accrued liabilities Concept (Monetary) For Period Debit iag:AdjustmentsForIncreaseDecreaseinAccountsPayableAndAccruedLiabilities
1624 Movements in non-cash working capital items and non-current ore stockpiles Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
1625 2486404 - Disclosure - CASH FLOW ITEMS - Changes in Other Investing Activities (Details) Network

*

*

 http://www.iamgold.com/role/CashFlowItemsChangesInOtherInvestingActivitiesDetails
1626 Implied Table Table

*

*

 implied:Table
1627 Cash Flow Statement [Abstract] Abstract iag:CashFlowStatementAbstract
1628 Disposal (acquisition) of investments Concept (Monetary) For Period Debit ifrs-full:OtherCashReceiptsFromSalesOfEquityOrDebtInstrumentsOfOtherEntitiesClassifiedAsInvestingActivities
1629 Advances to related parties Concept (Monetary) For Period Credit ifrs-full:CashAdvancesAndLoansMadeToRelatedParties
1630 Repayments from related parties Concept (Monetary) For Period Debit ifrs-full:CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToRelatedParties
1631 Prepayment for other assets Concept (Monetary) For Period Credit iag:PaymentsForPrepaymentForOtherAssets
1632 Other Concept (Monetary) For Period Debit iag:MiscellaneousOtherInflowsOutflowsOfCashClassifiedAsInvestingActivities
1633 Other investing activities Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities
1634 2486405 - Disclosure - CASH FLOW ITEMS - Reconciliation of Long-Term Debt Arising from Financing Activities (Details) Network

*

*

 http://www.iamgold.com/role/CashFlowItemsReconciliationOfLongTermDebtArisingFromFinancingActivitiesDetails
1635 Disclosure of reconciliation of liabilities arising from financing activities [Table] Table

*

*

 ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable
1636 Liabilities arising from financing activities [axis] Axis ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
1637 Liabilities Arising From Financing Activities [Domain] Member iag:LiabilitiesArisingFromFinancingActivitiesDomain
1638 Long-term debt Member ifrs-full:LongtermBorrowingsMember
1639 Disclosure of reconciliation of liabilities arising from financing activities [Line Items] LineItems ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
1640 Reconciliation Of Long-Term Debt Arising From Financing Activities [Roll Forward] Abstract ifrs-full:ChangesInLiabilitiesArisingFromFinancingActivitiesAbstract
1641 Beginning balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1642 Net proceeds from issuance of 7% Senior Notes Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
1643 Non-cash changes: Abstract iag:NonCashChangesInLongTermDebtArisingFromFinancingActivitiesAbstract
1644 Amortization of deferred financing charges Concept (Monetary) For Period Credit iag:IncreaseDecreaseThroughAmortisationExpensesLiabilitiesArisingFromFinancingActivities
1645 Change in fair value of embedded derivative Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughChangesInFairValuesLiabilitiesArisingFromFinancingActivities
1646 Loss on redemption of 6.75% Senior Notes Concept (Monetary) For Period Credit iag:GainLossThroughRedemptionRepurchaseOfBorrowingsLiabilitiesArisingFromFinancingActivities
1647 Repayment of 6.75% Senior Notes Concept (Monetary) For Period Credit iag:IncreaseDecreaseThroughRedemptionRepurchaseOfBorrowingsLiabilitiesArisingFromFinancingActivities
1648 Ending balance Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1649 2487402 - Disclosure - REVERSAL OF IMPAIRMENT CHARGES (Details) Network

*

*

 http://www.iamgold.com/role/ReversalOfImpairmentChargesDetails
1650 Disclosure of impairment loss and reversal of impairment loss [table] Table

*

*

 ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossTable
1651 Classes of assets [axis] Axis ifrs-full:ClassesOfAssetsAxis
1652 Assets [member] Member ifrs-full:ClassesOfAssetsMember
1653 Property, plant and equipment Member ifrs-full:PropertyPlantAndEquipmentMember
1654 Exploration and evaluation assets Member ifrs-full:ExplorationAndEvaluationAssetsMember
1655 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1656 Entity's total for joint ventures Member ifrs-full:EntitysTotalForJointVenturesMember
1657 Côté Gold Member iag:CtGoldMember
1658 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1659 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1660 Euro Ressources S. A. and Rosebel Gold Mines N. V. Member iag:EuroRessourcesS.A.AndRosebelGoldMinesN.V.Member
1661 Disclosure of impairment loss and reversal of impairment loss [line items] LineItems ifrs-full:DisclosureOfImpairmentLossAndReversalOfImpairmentLossLineItems
1662 Reversal of impairment charges Concept (Monetary) For Period Credit ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLoss
1663 Reversal of impairment loss recognized in profit or loss, net of tax Concept (Monetary) For Period Credit iag:ReversalOfImpairmentLossRecognizedInProfitOrLossNetofTax
1664 Life of mine used in current measurement of fair value less costs of disposal Concept (xbrli:durationItemType) For Period iag:LifeOfMineUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
1665 Estimated gold price for the first five years (in dollars per ounce) Concept (Decimal) For Period iag:EstimatedGoldPriceForFirstFiveYearsUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
1666 Estimated gold price after the first five years (in dollars per ounce) Concept (Decimal) For Period iag:EstimatedGoldPriceAfterFiveYearsUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
1667 Discount rate used in current measurement of fair value less costs of disposal Concept (Percent) As Of ifrs-full:DiscountRateUsedInCurrentMeasurementOfFairValueLessCostsOfDisposal
1668 Un-modeled mineralization for the CGU (in dollars per ounce) Concept (Decimal) For Period iag:UnmodeledMineralizationUsedToMeasureFairValueLessCostsOfDisposal
1669 Proportion of ownership interest sold in joint venture Concept (Percent) For Period iag:ProportionOfOwnershipInterestSoldInAssociate
1670 2488402 - Disclosure - COMMITMENTS (Details) Network

*

*

 http://www.iamgold.com/role/CommitmentsDetails
1671 Disclosure of Commitments [Table] Table

*

*

 iag:DisclosureOfCommitmentsTable
1672 Maturity [axis] Axis ifrs-full:MaturityAxis
1673 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1674 Less than One Year Member ifrs-full:NotLaterThanOneYearMember
1675 1-2 yrs Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
1676 3-5 yrs Member ifrs-full:LaterThanTwoYearsAndNotLaterThanFiveYearsMember
1677 Greater than 5 Years Member ifrs-full:LaterThanFiveYearsMember
1678 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1679 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1680 Essakane S.A. Member iag:EssakaneS.A.Member
1681 Rosebel Gold Mines N.V. Member iag:RosebelGoldMinesN.V.Member
1682 Disclosure Of Commitments [Line Items] LineItems iag:DisclosureofCommitmentsLineItems
1683 Purchase obligations Concept (Monetary) As Of Credit iag:PurchaseObligation1
1684 Capital expenditure obligations Concept (Monetary) As Of Credit ifrs-full:ContractualCapitalCommitments
1685 Finance lease obligations Concept (Monetary) As Of Credit ifrs-full:GrossFinanceLeaseObligations
1686 Operating leases Concept (Monetary) As Of Credit ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1687 Total commitments Concept (Monetary) As Of Credit iag:ContractualObligation1
1688 Royalties Concept (Monetary) For Period Debit ifrs-full:RoyaltyExpense
1689 Royalty percentage, conditional market price if market price is lower or equal to $1,000 per ounce Concept (Percent) For Period iag:RoyaltyPercentageConditionalMarketPriceLowerThanOrEqualToOneThousandDollarsPerOunce
1690 Royalty percentage, conditional market price if market price is between $1,000 and $1,300 per ounce Concept (Percent) For Period iag:RoyaltyPercentageConditionalMarketPriceBetweenOneThousandAndOneThousandThreeHundredDollarsPerOunce
1691 Royalty percentage, conditional market price if market price is great than $1,300 per ounce Concept (Percent) For Period iag:RoyaltyPercentageConditionalMarketPriceGreaterThanOneThousandThreeHundredDollarsPerOunce
1692 In-kind royalty per ounce, percentage Concept (Percent) For Period iag:RoyaltyPercentageInKindRoyaltyPerOunce
1693 Price participation percentage in excess of market price of $425 per ounce Concept (Percent) For Period iag:RoyaltyPercentagePriceParticipationPercentageInExcessOfMarketPriceOfFourHundredAndTwentyFiveDollarsPerOunce
1694 Percent of minerals payable to charitable foundation Concept (Percent) For Period iag:RoyaltyPercentagePercentOfMineralsPayableToCharitableFoundation
1695 2489402 - Disclosure - RELATED PARTY TRANSACTIONS Receivables and Other Current Assets From Related Parties (Details) Network

*

*

 http://www.iamgold.com/role/RelatedPartyTransactionsReceivablesAndOtherCurrentAssetsFromRelatedPartiesDetails
1696 Disclosure of transactions between related parties [table] Table

*

*

 ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesTable
1697 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
1698 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
1699 Joint ventures where entity is venturer Member ifrs-full:JointVenturesWhereEntityIsVenturerMember
1700 Types of financial assets [axis] Axis ifrs-full:TypesOfFinancialAssetsAxis
1701 Financial assets, type [member] Member ifrs-full:FinancialAssetsTypeMember
1702 Non-Interest Bearing Receivable Member iag:NonInterestBearingReceivableMember
1703 Interest Bearing Receivable Member iag:InterestBearingReceivableMember
1704 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1705 Entity's total for joint ventures Member ifrs-full:EntitysTotalForJointVenturesMember
1706 Sadiola And Yatela Member iag:SadiolaAndYatelaMember
1707 Merrex Gold Inc. Member iag:MerrexGoldInc.Member
1708 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1709 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1710 Floating interest rate Member ifrs-full:FloatingInterestRateMember
1711 Disclosure of transactions between related parties [line items] LineItems ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesLineItems
1712 Amounts receivable, related party transactions beginning balance Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
1713 Advances Concept (Monetary) For Period ifrs-full:TransfersUnderFinanceAgreementsFromEntityRelatedPartyTransactions
1714 Repayments Concept (Monetary) For Period ifrs-full:TransfersUnderFinanceAgreementsToEntityRelatedPartyTransactions
1715 Write-down of receivable Concept (Monetary) For Period Credit iag:TransfersUnderFinanceAgreementsToEntityRecoveryWriteDownOfReceivable
1716 Amounts receivable, related party transactions ending balance Concept (Monetary) As Of Debit ifrs-full:AmountsReceivableRelatedPartyTransactions
1717 Related party transactions, interest rate basis Concept (Percent) For Period iag:AmountsReceivableRelatedPartyTransactionsAdjustmentToInterestRateBasis
1718 2489403 - Disclosure - RELATED PARTY TRANSACTIONS Compensation of Key Management Personnel (Details) Network

*

*

 http://www.iamgold.com/role/RelatedPartyTransactionsCompensationOfKeyManagementPersonnelDetails
1719 Implied Table Table

*

*

 implied:Table
1720 Related Party [Abstract] Abstract iag:RelatedPartyAbstract
1721 Salaries and other benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1722 Share-based payments Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1723 Key management personnel compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1724 2490402 - Disclosure - SEGMENTED INFORMATION - BALANCE SHEETS (Details) Network

*

*

 http://www.iamgold.com/role/SegmentedInformationBalanceSheetsDetails
1725 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
1726 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1727 Entity's total for joint ventures Member ifrs-full:EntitysTotalForJointVenturesMember
1728 Société d'Exploitation des Mines d'Or de Sadiola S.A. Member iag:SocitdExploitationdesMinesdOrdeSadiolaS.A.Member
1729 Yatela Member iag:YatelaMember
1730 Segments [axis] Axis ifrs-full:SegmentsAxis
1731 Segments [member] Member ifrs-full:SegmentsMember
1732 Gold mines Member iag:GoldMineSegmentsMember
1733 Exploration and evaluation and development Member iag:ExplorationAndEvaluationSegmentMember
1734 Corporate Member iag:Corporate1Member
1735 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1736 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1737 BURKINA FASO Member country:BF
1738 SURINAME Member country:SR
1739 CANADA Member country:CA
1740 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1741 Ownership interest in joint venture Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
1742 Total non- current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1743 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
1744 Total liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
1745 2490403 - Disclosure - SEGMENTED INFORMATION - STATEMENT OF EARNINGS (Details) Network

*

*

 http://www.iamgold.com/role/SegmentedInformationStatementOfEarningsDetails
1746 Disclosure of operating segments [table] Table

*

*

 ifrs-full:DisclosureOfOperatingSegmentsTable
1747 Segments [axis] Axis ifrs-full:SegmentsAxis
1748 Segments [member] Member ifrs-full:SegmentsMember
1749 Gold mines Member iag:GoldMineSegmentsMember
1750 Exploration and evaluation and development Member iag:ExplorationAndEvaluationSegmentMember
1751 Corporate Member iag:Corporate1Member
1752 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1753 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1754 BURKINA FASO Member country:BF
1755 SURINAME Member country:SR
1756 CANADA Member country:CA
1757 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
1758 Entity's total for joint ventures Member ifrs-full:EntitysTotalForJointVenturesMember
1759 Société d'Exploitation des Mines d'Or de Sadiola S.A. Member iag:SocitdExploitationdesMinesdOrdeSadiolaS.A.Member
1760 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
1761 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1762 Operating Segments Including Incorporated Joint Ventures Member iag:OperatingSegmentsIncludingIncorporatedJointVenturesMember
1763 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1764 Revenues Concept (Monetary) For Period Credit ifrs-full:Revenue
1765 Cost of sales Concept (Monetary) For Period Debit iag:CostOfSalesExcludingDepreciationExpense
1766 Depreciation expense Concept (Monetary) For Period Debit ifrs-full:DepreciationExpense
1767 General and administrative Concept (Monetary) For Period Debit ifrs-full:AdministrativeExpense
1768 Exploration Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
1769 Impairments (reversals) Concept (Monetary) For Period ifrs-full:ReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment
1770 Other expenses Concept (Monetary) For Period Debit ifrs-full:OtherExpenseByNature
1771 Earnings from operations Concept (Monetary) For Period Credit ifrs-full:ProfitLossFromOperatingActivities
1772 Net capital expenditures Concept (Monetary) For Period Credit iag:PaymentsToAcquireProductiveAssets1
1773 2491401 - Disclosure - SUBSEQUENT EVENTS (Details) Network

*

*

 http://www.iamgold.com/role/SubsequentEventsDetails
1774 Disclosure of non-adjusting events after reporting period [table] Table

*

*

 ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodTable
1775 Non-adjusting events after reporting period [axis] Axis ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1776 Non-adjusting events after reporting period [member] Member ifrs-full:NonadjustingEventsMember
1777 Disposals of assets Member ifrs-full:OtherDisposalsOfAssetsMember
1778 Legal Entity [Axis] Axis dei:LegalEntityAxis
1779 Entity [Domain] Member dei:EntityDomain
1780 Sadiola Exploration Limited Member iag:SadiolaExplorationLimitedMember
1781 Disclosure of non-adjusting events after reporting period [line items] LineItems ifrs-full:DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
1782 Prepayment amount Concept (Monetary) As Of Debit iag:ForwardSalesAgreementPrepaymentAmount
1783 Gold ounces deliverable in 2022 Concept (Integer) As Of iag:ForwardSalesAgreementUnitsDeliverable
1784 Floor price (in dollars per ounce) Concept (Monetary) As Of Credit iag:ForwardSalesAgreementFloorPricePerOunce
1785 Cap price (in dollars per ounce) Concept (Monetary) As Of Credit iag:ForwardSalesAgreementCapPricePerOunce
1786 Annual interest rate Concept (Percent) As Of iag:ForwardSalesAgreementAnnualInterestRate
1787 Percent of participation in mine operations Concept (Percent) For Period iag:PercentOfParticipationInMineOperationsSold
1788 Sale of participation in mines, consideration amount Concept (Monetary) For Period Credit iag:ExplorationAndEvaluationAssetsConsiderationReceived

*

*