cm:Concept: us-gaap:ProductLiabilityContingencyUncertaintiesFromJointAndSeveralLiability
| Product Liability Contingency, Uncertainties from Joint and Several Liability |
| us-gaap:ProductLiabilityContingencyUncertaintiesFromJointAndSeveralLiability |
| Uncertainties with respect to joint and several liability that may affect the magnitude of the contingency. |
| cm:Concept |
| Text/String (xbrli:stringItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:ProductLiabilityContingencyUncertaintiesFromJointAndSeveralLiability |