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Statutory Financial Information of Insurance Subsidiaries (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
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Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Repwest [Member] |  |  |  |
Statutory financial information of insurance subsidiaries: |  |  |  |
Statutory accounting practices, statutory amount available for dividend payments | $ 26.7 |  |  |
Dividend payments restrictions schedule, amounts paid | 22.6 | $ 21.6 |  |
Oxford [Member] |  |  |  |
Statutory financial information of insurance subsidiaries: |  |  |  |
Statutory accounting practices, statutory amount available for dividend payments | $ 23.0 |  |  |
Dividend payments restrictions schedule, amounts paid |  | $ 18.6 |  |
Restricted net assets, subsidiaries |  |  | $ 91.7 | $ 105.4

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- Definition Amount of restricted net assets of consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(3)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
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