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cm:Concept: us-gaap:AssetRetirementObligationLegallyRestrictedAssetsFairValue
Standard label: Asset Retirement Obligation, Legally Restricted Assets, Fair Value
Name: us-gaap:AssetRetirementObligationLegallyRestrictedAssetsFairValue
Documentation: Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: As Of (instant)
Balance type: Debit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:AssetRetirementObligationLegallyRestrictedAssetsFairValue

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Labels
Label Role Language
Asset Retirement Obligation, Legally Restricted Assets, Fair Value http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 410 20 50 1 (b) http://fasb.org/us-gaap/role/ref/legacyRef 410