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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at the beginning of the period $ 290.8 $ 306.6  
Acquisition costs deferred 460.0 398.3  
Amortization of deferred acquisition costs (431.8) (414.1) $ (465.7)
Balance at the end of the period $ 319.0 $ 290.8 $ 306.6