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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pre-Tax        
Foreign currency translation adjustment $ 48.5 $ 20.4 $ (11.6) $ 11.6
Change in net realized and unrealized gain (loss) on derivative securities (0.6) 0.2 2.2 0.5
Change in net unrealized gain (loss) on investment securities 76.5 8.3 90.7 (13.9)
Other comprehensive loss 124.4 28.9 81.3 (1.8)
Tax Benefit (Expense)        
Foreign currency translation adjustment 0.0 0.0 0.0 0.0
Change in net realized and unrealized gain (loss) on derivative securities (0.1) (0.1) (0.2) (0.2)
Change in net unrealized gain (loss) on investment securities (28.6) (3.2) (34.1) 5.2
Other comprehensive loss (28.7) (3.3) (34.3) 5.0
Net of Tax        
Foreign currency translation adjustment 48.5 20.4 (11.6) 11.6
Change in net realized and unrealized gain (loss) on derivative securities (0.7) 0.1 2.0 0.3
Change in net unrealized gain (loss) on investment securities 47.9 5.1 56.6 (8.7)
Other comprehensive income $ 95.7 $ 25.6 $ 47.0 $ 3.2