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Deferred Policy Acquisition Costs - Reconciliation of Beginning and Ending Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]        
Balance at the beginning of the period $ 367.5 $ 407.7 $ 358.4 $ 361.1
Acquisition costs deferred 93.4 128.1 216.2 304.9
Amortization of deferred policy acquisition costs (96.3) (126.7) (210.0) (256.9)
Balance at the end of the period $ 364.6 $ 409.1 $ 364.6 $ 409.1