| Standard label: | Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |
| Name: | us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
| Documentation: | Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill |
| Label | Role | Language |
| Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| FASB Accounting Standards Codification 350 30 50 3 (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 350 |
| Part Of Roll Up: |
| us-gaap:ImpairmentOfIntangibleAssetsExcludingGoodwill |