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Statutory Financial Information of Insurance Subsidiaries (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Property and Casualty Insurance [Member] | Repwest [Member] |  |  |  |
Statutory financial information of insurance subsidiaries: |  |  |  |
Statutory accounting practices, statutory amount available for dividend payments |  |  | $ 22.7 |
Dividend payments restrictions schedule, amounts paid | $ 22.6 | $ 21.6 |  |
Restricted net assets, subsidiaries |  |  | 105.4 | $ 98.5
Life Insurance [Member] | Oxford [Member] |  |  |  |
Statutory financial information of insurance subsidiaries: |  |  |  |
Statutory accounting practices, statutory amount available for dividend payments |  |  | $ 6.3 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Amount of dividends available for payment after computation of statutory restrictions on capital surplus. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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