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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at the beginning of the period $ 319.0 $ 290.8  
Acquisition costs deferred 357.4 460.0  
Amortization of deferred acquisition costs (380.2) (431.8) $ (414.1)
Balance at the end of the period $ 296.2 $ 319.0 $ 290.8