*

cm:Concept: us-gaap:AssetRetirementObligation
Standard label: Asset Retirement Obligation
Name: us-gaap:AssetRetirementObligation
Documentation: The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
Object type: cm:Concept
Data type: Monetary (xbrli:monetaryItemType)
Period type: As Of (instant)
Balance type: Credit
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:AssetRetirementObligation

*

Labels
Label Role Language
Asset Retirement Obligation http://www.xbrl.org/2003/role/label en-US
Asset Retirement Obligation, Ending Balance http://www.xbrl.org/2003/role/periodEndLabel en-US
Asset Retirement Obligation, Beginning Balance http://www.xbrl.org/2003/role/periodStartLabel en-US
Asset Retirement Obligation, Total http://www.xbrl.org/2003/role/totalLabel en-US

*

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