Schedule V - Valuation and Qualifying Accounts (Details) - Reserve for unrecoverable reinsurance [Member] - USD ($) $ in Millions |
12 Months Ended | ||||
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Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | |||||
Balance at Beginning of Period | $ 36.5 | $ 0.0 | $ 0.0 | ||
Charged to Cost and Expenses | 3.5 | 6.4 | 0.0 | ||
Charged to Other Accounts - Describe | [1] | 0.0 | 30.1 | 0.0 | |
Deductions - Describe | 0.0 | 0.0 | 0.0 | ||
Balance at End of Period | $ 40.1 | $ 36.5 | $ 0.0 | ||
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