| Standard label: | Premium Receivable, Allowance for Credit Loss |
| Name: | us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts |
| Documentation: | The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PremiumsReceivableAllowanceForDoubtfulAccounts |
| Label | Role | Language |
| Premium Receivable, Allowance for Credit Loss | http://www.xbrl.org/2003/role/label | en-US |
| Premium Receivable, Allowance for Credit Loss, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Premium Receivable, Allowance for Credit Loss, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 310 10 50 11B (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 310 |
| FASB Accounting Standards Codification 310 10 50 4 | http://www.xbrl.org/2009/role/commonPracticeRef | 310 |
| FASB Accounting Standards Codification 326 20 50 13 (a) | http://www.xbrl.org/2009/role/commonPracticeRef | 326 |
| FASB Accounting Standards Codification 326 20 50 13 (f) | http://www.xbrl.org/2009/role/commonPracticeRef | 326 |
| FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03(5)) | http://www.xbrl.org/2003/role/disclosureRef | 944 |