| Standard label: | Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) |
| Name: | us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsGrossPeriodIncreaseDecrease |
| Documentation: | The increase (decrease) during the reporting period in asbestos and environmental claims reserve, before estimated recoveries from reinsurers. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LiabilityForAsbestosAndEnvironmentalClaimsGrossPeriodIncreaseDecrease |
| Label | Role | Language |
| Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) | http://www.xbrl.org/2003/role/label | en-US |
| Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 40 50 3 (b),(c) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |