| Standard label: | Redeemable Preferred Stock [Member] |
| Name: | us-gaap:RedeemablePreferredStockMember |
| Documentation: | Description of type or class of redeemable preferred stock. For instance, cumulative preferred stock, noncumulative preferred stock, convertible or series. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:RedeemablePreferredStockMember |
| Label | Role | Language |
| Redeemable Preferred Stock [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (27) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 480 10 S99 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 480 |