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cm:Level2TextBlock: us-gaap:AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock
Standard label: Asset Retirement Obligation and Environmental Cost [Policy Text Block]
Name: us-gaap:AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock
Documentation: Disclosure of accounting policy for legal obligation associated with retirement of long-lived asset that results from acquisition, construction, or development or from normal operation of long-lived asset, and environmental remediation liability from improper or other-than-normal operation of long-lived asset. Includes, but is not limited to, timing of recognition and whether obligation is measured on discounted basis.
Object type: cm:Level2TextBlock
Data type: Text Block (HTML) (nonnum:textBlockItemType)
Period type: For Period (duration)
Balance type: (no balance type)
Abstract: false
Workiva Wdesk Taxonomy Analyzer: us-gaap:AssetRetirementObligationsAndEnvironmentalCostPolicyTextBlock

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Labels
Label Role Language
Asset Retirement Obligation and Environmental Cost [Policy Text Block] http://www.xbrl.org/2003/role/label en-US

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References
Reference Role Topic
FASB Accounting Standards Codification 235 10 50 3 http://fasb.org/us-gaap/role/ref/legacyRef 235
FASB Accounting Standards Codification 410 20 50 1 http://fasb.org/us-gaap/role/ref/legacyRef 410
FASB Accounting Standards Codification 410 30 50 8 http://www.xbrl.org/2003/role/recommendedDisclosureRef 410
FASB Accounting Standards Codification 410 30 55 14 http://www.xbrl.org/2003/role/exampleRef 410