cm:Member: us-gaap:MultiemployerPlansPostretirementBenefitMember
Multiemployer Plans, Postretirement Benefit [Member] |
us-gaap:MultiemployerPlansPostretirementBenefitMember |
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:Member |
[Member] (nonnum:domainItemType) |
For Period (duration) |
(no balance type) |
true |
us-gaap:MultiemployerPlansPostretirementBenefitMember |