| Standard label: | Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease) |
| Name: | us-gaap:PremiumsReceivableAllowanceForDoubtfulAccountsPeriodIncreaseDecrease |
| Documentation: | Amount of increase (decrease) in allowance for credit loss on premium receivable. |
| 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:PremiumsReceivableAllowanceForDoubtfulAccountsPeriodIncreaseDecrease |
| Label | Role | Language |
| Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease) | http://www.xbrl.org/2003/role/label | en-US |
| Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 50 11B (c) | http://www.xbrl.org/2009/role/commonPracticeRef | 310 |
| FASB Accounting Standards Codification 326 20 50 13 | http://www.xbrl.org/2009/role/commonPracticeRef | 326 |