| Standard label: | Insured Event, Gain (Loss) |
| Name: | us-gaap:InsuredEventGainLoss |
| Documentation: | Amount of excess (deficiency) of insurance recovery over the loss incurred from an insured event. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:InsuredEventGainLoss |
| Label | Role | Language |
| Insured Event, Gain (Loss) | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 450 30 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |