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cm:Concept: us-gaap:AssetRetirementObligationsLiabilityNotRecognized
Standard label: Asset Retirement Obligations, Liability Not Recognized
Name: us-gaap:AssetRetirementObligationsLiabilityNotRecognized
Documentation: Description of an asset retirement obligation for which a liability has not been recognized because fair value cannot be reasonably estimated and the reasons why fair value cannot be reasonably estimated.
Object type: cm:Concept
Data type: Text/String (xbrli:stringItemType)
Period type: For Period (duration)
Balance type: (no balance type)
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:AssetRetirementObligationsLiabilityNotRecognized

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Labels
Label Role Language
Asset Retirement Obligations, Liability Not Recognized http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 410 20 50 2 http://fasb.org/us-gaap/role/ref/legacyRef 410