cm:Concept: us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings
| Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings |
| us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings |
| Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildings |