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Long-Duration Insurance Contracts - Market Risk Benefits Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2020
Market Risk Benefit [Roll Forward]          
Balance, beginning of period $ (3.6) $ 4.6 $ 0.2 $ 4.8  
Balance, beginning of period, before effects of changes in the instrument-specific credit risk (3.2) 4.2 0.0 2.0  
Changes in market risk benefits (1.3) (1.6) (4.5) 0.6  
Balance, end of period (4.5) 2.6 (4.5) 2.6  
Effect of changes in the instrument-specific credit risk 0.0 0.3 0.0 0.3  
Balance, end of period (4.5) 2.9 (4.5) 2.9  
Net amount at risk $ 37.6 $ 79.9 $ 37.6 $ 79.9 $ 8.6
Weighted-average attained age of contract holders 63 years 63 years 63 years 63 years