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cm:Concept: us-gaap:AssetRetirementObligationsSignificantChanges
Standard label: Asset Retirement Obligations, Significant Changes
Name: us-gaap:AssetRetirementObligationsSignificantChanges
Documentation: Description of the significant increases or decreases in the carrying amount of the asset retirement obligation during the period, such as changes in significant assumptions used to calculate the carrying amount of the asset retirement obligation.
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:AssetRetirementObligationsSignificantChanges

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Labels
Label Role Language
Asset Retirement Obligations, Significant Changes 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 (c) http://fasb.org/us-gaap/role/ref/legacyRef 410