| Standard label: | Retirement Benefits, Description |
| Name: | us-gaap:GeneralDiscussionOfPensionAndOtherPostretirementBenefits |
| Documentation: | Description of nature and type of retirement benefits. |
| Object type: | cm:Concept |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GeneralDiscussionOfPensionAndOtherPostretirementBenefits |
| Label | Role | Language |
| Retirement Benefits, Description | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 20 55 17 | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |