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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at the beginning of the period $ 291.1 $ 248.5  
Acquisition costs deferred 481.2 455.3  
Amortization of deferred policy acquisition costs (465.7) (412.7) $ (371.6)
Balance at the end of the period $ 306.6 $ 291.1 $ 248.5