cm:Concept: us-gaap:BusinessCombinationContingentConsiderationArrangementsDescription
| Business Combination, Contingent Consideration Arrangements, Description |
| us-gaap:BusinessCombinationContingentConsiderationArrangementsDescription |
| For contingent consideration arrangements recognized in connection with a business combination, this element represents a description of such arrangements. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:BusinessCombinationContingentConsiderationArrangementsDescription |