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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, 2017
Mar. 31, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Balance at the beginning of the period $ 358.4 $ 361.1
Acquisition costs deferred 122.8 176.8
Amortization of deferred policy acquisition costs (113.7) (130.2)
Balance at the end of the period $ 367.5 $ 407.7