cm:Concept: us-gaap:BusinessCombinationAssetsArisingFromContingenciesAmountRecognized
| Business Combination, Assets Arising from Contingencies, Amount Recognized |
| us-gaap:BusinessCombinationAssetsArisingFromContingenciesAmountRecognized |
| The amount, measured at acquisition-date fair value, of all the assets acquired that arise from contingencies and were recognized by the entity. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Debit |
| false |
| us-gaap:BusinessCombinationAssetsArisingFromContingenciesAmountRecognized |