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Deferred Policy Acquisition Costs - Reconciliation of Beginning and Ending Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Balance at the beginning of the period $ 294.3 $ 358.4
Acquisition costs deferred 116.4 122.8
Amortization of deferred policy acquisition costs (90.8) (113.7)
Balance at the end of the period $ 319.9 $ 367.5