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Investments - Net Investment Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Interest on cash and cash equivalents $ 2.2 $ 1.2 $ 4.7 $ 1.4
Fixed maturities income 1.5 0.6 4.1 1.1
Short-term investment income 2.1 0.8 8.1 1.7
Total gross investment income 5.8 2.6 16.9 4.2
Investment expenses (0.1) (0.1) (0.4) (0.2)
Net investment income $ 5.7 $ 2.5 $ 16.5 $ 4.0