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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]      
Balance at the beginning of the period $ 248.5 $ 294.3  
Acquisition costs deferred 455.3 325.8  
Amortization of deferred policy acquisition costs (412.7) (371.6) $ (400.5)
Balance at the end of the period $ 291.1 $ 248.5 $ 294.3