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cm:Concept: us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Standard label: Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax
Name: us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax
Documentation: Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: For Period (duration)
Balance type: Credit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax

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Labels
Label Role Language
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax http://www.xbrl.org/2003/role/label en-US
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Total http://www.xbrl.org/2003/role/totalLabel en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 220 10 45 10A (d) http://fasb.org/us-gaap/role/ref/legacyRef 220