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Comprehensive Income - Summary of the Tax Effects Allocated to Each Component of Other Comprehensive Income(Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pre-Tax    
Foreign currency translation adjustment $ 12.2 $ (2.0)
Change in net realized and unrealized gain (loss) on derivative securities (0.3) (1.1)
Change in net unrealized gain (loss) on investment securities 7.3 (17.4)
Other comprehensive income (loss) 19.2 (20.5)
Tax Benefit (Expense)    
Foreign currency translation adjustment 0.0 0.0
Change in net realized and unrealized gain (loss) on derivative securities 0.0 0.0
Change in net unrealized gain (loss) on investment securities (2.4) 6.6
Other comprehensive income (loss) (2.4) 6.6
Net of Tax    
Foreign currency translation adjustment 12.2 (2.0)
Change in net realized and unrealized gain (loss) on derivative securities (0.3) (1.1)
Change in net unrealized gain (loss) on investment securities 4.9 (10.8)
Other comprehensive income (loss) $ 16.8 $ (13.9)