cm:Concept: us-gaap:AccruedInsuranceNoncurrent
| Accrued Insurance, Noncurrent |
| us-gaap:AccruedInsuranceNoncurrent |
| Carrying value as of the balance sheet date of obligations incurred through that date and due beyond one year (or beyond one operating cycle if longer) to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverages to employees. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:AccruedInsuranceNoncurrent |