cm:Concept: us-gaap:GainOnBusinessInterruptionInsuranceRecovery
| Gain on Business Interruption Insurance Recovery |
| us-gaap:GainOnBusinessInterruptionInsuranceRecovery |
| The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:GainOnBusinessInterruptionInsuranceRecovery |