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Schedule V - Valuation and Qualifying Accounts (Details) - Reserve for unrecoverable reinsurance [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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
[1] Relates to the Company's adoption of the FASB's current expected credit loss standard effective January 1, 2020.