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cm:Concept: us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase
Standard label: Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase
Name: us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase
Documentation: Amount, measured using unobservable input, of increase in plan asset of defined benefit plan from purchase.
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: For Period (duration)
Balance type: Debit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:DefinedBenefitPlanPlanAssetsLevel3ReconciliationIncreaseForPurchase

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Labels
Label Role Language
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 715 20 50 1 (d)(iv)(02)(B) http://www.xbrl.org/2009/role/commonPracticeRef 715

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Roll Up Relations
Part Of Roll Up:
us-gaap:DefinedBenefitPlanPurchasesSalesAndSettlements