cm:Concept: us-gaap:PresentValueOfFutureInsuranceProfitsPercentageOfAmortizationExpenseYearTwo
| Present Value of Future Insurance Profits, Percentage of Amortization Expense, Year Two |
| us-gaap:PresentValueOfFutureInsuranceProfitsPercentageOfAmortizationExpenseYearTwo |
| Percentage of amortization expense expected to be recognized during second fiscal year following latest fiscal year for present value of future profits of insurance contract acquired in business combination. |
| cm:Concept |
| Percent (num:percentItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:PresentValueOfFutureInsuranceProfitsPercentageOfAmortizationExpenseYearTwo |