cm:Concept: us-gaap:RedeemableNoncontrollingInterestEquityPreferredFairValue
| Redeemable Noncontrolling Interest, Equity, Preferred, Fair Value |
| us-gaap:RedeemableNoncontrollingInterestEquityPreferredFairValue |
| The fair value as of the reporting date of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| As Of (instant) |
| Credit |
| false |
| us-gaap:RedeemableNoncontrollingInterestEquityPreferredFairValue |