cm:Level3TextBlock: us-gaap:ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTextBlock
| Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table Text Block] |
| us-gaap:ScheduleOfAcquiredIndefiniteLivedIntangibleAssetsByMajorClassTextBlock |
| Tabular disclosure of acquired indefinite-lived intangible assets. Indefinite-lived intangible assets are assets that have no physical form, but have expected future economic benefit. Indefinite-lived assets are assets that are not subject to amortization. Acquired indefinite-lived intangible assets are disclosed by major class (assets that can be grouped together because they are similar, either by their nature or by their use in operations of the entity) and in total. |
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| AcquiredIndefinitelivedIntangibleAssetsByMajorClass |