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Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning Balance $ 4,426.5 $ 3,769.1 $ 3,643.2
Other comprehensive gain (loss) before reclassifications 142.1 (138.8)  
Amounts reclassified (22.6) (11.6)  
Other comprehensive income (loss) 119.5 (150.4) (69.2)
Ending Balance 4,578.5 4,426.5 3,769.1
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning Balance (213.9) (98.6)  
Other comprehensive gain (loss) before reclassifications 128.0 (115.3)  
Amounts reclassified 0.0 0.0  
Other comprehensive income (loss) 128.0 (115.3) (93.2)
Ending Balance (85.9) (213.9) (98.6)
Realized and Unrealized Gains (Losses) on Derivative Securities      
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning Balance 0.4 0.3  
Other comprehensive gain (loss) before reclassifications (1.6) (1.0)  
Amounts reclassified 0.8 1.1  
Other comprehensive income (loss) (0.8) 0.1 1.9
Ending Balance (0.4) 0.4 0.3
Change in net unrealized gain (loss) on investment securities      
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning Balance [1] 9.8 45.0  
Other comprehensive gain (loss) before reclassifications [1] 15.7 (22.5)  
Amounts reclassified [1] (23.4) (12.7)  
Other comprehensive income (loss) (7.7) [1] (35.2) [1] 22.1
Ending Balance [1] 2.1 9.8 45.0
Total      
Accumulated Other Comprehensive Income (Loss) Net of Tax [Roll Forward]      
Beginning Balance (203.7) (53.3)  
Ending Balance $ (84.2) $ (203.7) $ (53.3)
[1] See Note 2 for amounts reclassified from Other comprehensive income (loss).