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Investments - Net Realized Gains on Sales of Investments (Details) - Fixed Maturities - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net Investment Income [Line Items]    
Gains on Sales $ 1.1 $ 0.4
Losses on Sales $ (3.3) $ (0.8)