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Comprehensive Income - Summary of the Tax Effects Allocated to each Component of Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Comprehensive Income (Loss), Pre-Tax      
Foreign currency translation gain (loss) $ (93.2) $ (62.0) $ (19.6)
Change in net realized and unrealized gain (loss) on derivative securities 2.3 0.6 1.5
Change in net unrealized gain (loss) on investment securities 34.8 5.6 19.5
Other comprehensive income (loss) (56.1) (55.8) 1.4
Other Comprehensive Income (Loss), Tax Benefit (Expense)      
Foreign currency translation gain (loss) 0.0 0.0 0.0
Change in net realized and unrealized gain (loss) on derivative securities (0.4) (0.3) (0.5)
Change in net unrealized gain (loss) on investment securities (12.7) (2.2) (8.0)
Other comprehensive income (loss) (13.1) (2.5) (8.5)
Other Comprehensive Income (Loss), Net of Tax      
Foreign currency translation gain (loss) (93.2) (62.0) (19.6)
Change in net realized and unrealized gain (loss) on derivative securities 1.9 0.3 1.0
Change in net unrealized gain (loss) on investment securities 22.1 3.4 11.5
Other comprehensive income (loss) $ (69.2) $ (58.3) $ (7.1)