cm:Concept: us-gaap:MultiemployerPlansCollectiveBargainingArrangementPercentageOfParticipants
| Multiemployer Plans, Collective-Bargaining Arrangement, Percentage of Participants |
| us-gaap:MultiemployerPlansCollectiveBargainingArrangementPercentageOfParticipants |
| Percentage of employee participants subject to a collective bargaining arrangement to all participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. |
| cm:Concept |
| Percent (num:percentItemType) |
| As Of (instant) |
| (no balance type) |
| false |
| us-gaap:MultiemployerPlansCollectiveBargainingArrangementPercentageOfParticipants |