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Investments - Net Investment Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]    
Interest on cash and cash equivalents $ 7.3 $ 2.4
Fixed maturities income 5.9 2.9
Short-term investment income 10.4 3.9
Total investment income 23.6 9.2
Investment expenses (0.5) (0.2)
Net investment income $ 23.1 $ 9.0