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Stockholders' Equity - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 4,778.8    
Other comprehensive income (loss) before reclassifications 1.7 $ (8.0)  
Reclassified from accumulated other comprehensive income (loss) 0.5 1.4  
Other comprehensive gains (losses) 2.2 (6.6) $ 0.6
Ending balance 6,678.8 4,778.8  
Gains (Losses) on Hedge Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (2.4) 5.0  
Other comprehensive income (loss) before reclassifications 3.6 (8.6)  
Reclassified from accumulated other comprehensive income (loss) (1.0) 1.2  
Other comprehensive gains (losses) 2.6 (7.4)  
Ending balance 0.2 (2.4) 5.0
Unrealized Gains (Losses) on Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (11.3) (8.6)  
Other comprehensive income (loss) before reclassifications 0.3 (2.7)  
Reclassified from accumulated other comprehensive income (loss) 1.2 0.0  
Other comprehensive gains (losses) 1.5 (2.7)  
Ending balance (9.8) (11.3) (8.6)
Foreign Currency Translation Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 2.3 (1.3)  
Other comprehensive income (loss) before reclassifications (2.6) 3.6  
Reclassified from accumulated other comprehensive income (loss) 0.0 0.0  
Other comprehensive gains (losses) (2.6) 3.6  
Ending balance (0.3) 2.3 (1.3)
Employee Benefit Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (4.1) (4.0)  
Other comprehensive income (loss) before reclassifications 0.4 (0.3)  
Reclassified from accumulated other comprehensive income (loss) 0.3 0.2  
Other comprehensive gains (losses) 0.7 (0.1)  
Ending balance (3.4) (4.1) (4.0)
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (15.5) (8.9)  
Other comprehensive gains (losses)   (6.6) 0.6
Ending balance $ (13.3) $ (15.5) $ (8.9)