| Standard label: | Collective Bargaining Arrangement [Axis] |
| Name: | us-gaap:CollectiveBargainingArrangementAxis |
| Documentation: | Information by collective bargaining arrangement. A collective bargaining arrangement is a written, legally enforceable employment contract between management of an organization and its employees represented by a union. |
| Object type: | cm:Axis |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:CollectiveBargainingArrangementAxis |
| Label | Role | Language |
| Collective Bargaining Arrangement [Axis] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |