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Stockholders' Equity - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 9,731.5    
Other comprehensive income (loss) before reclassifications (45.7) $ 18.7  
Reclassified from accumulated other comprehensive income (loss) (3.4) (6.2)  
Other comprehensive income (loss) (49.1) 12.5 $ 25.7
Ending balance 11,901.1 9,731.5  
Unrealized Gains (Losses) on Hedging Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (2.9) 0.7  
Other comprehensive income (loss) before reclassifications 12.3 (0.8)  
Reclassified from accumulated other comprehensive income (loss) (4.9) (2.8)  
Other comprehensive income (loss) 7.4 (3.6)  
Ending balance 4.5 (2.9) 0.7
Unrealized  Gains (Losses) on Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 29.5 20.4  
Other comprehensive income (loss) before reclassifications (45.5) 13.8  
Reclassified from accumulated other comprehensive income (loss) 0.0 (4.7)  
Other comprehensive income (loss) (45.5) 9.1  
Ending balance (16.0) 29.5 20.4
Foreign Currency Translation Gains (Losses)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 4.7 0.0  
Other comprehensive income (loss) before reclassifications (12.6) 4.7  
Reclassified from accumulated other comprehensive income (loss) 0.0 0.0  
Other comprehensive income (loss) (12.6) 4.7  
Ending balance (7.9) 4.7 0.0
Employee Benefit Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (6.4) (8.7)  
Other comprehensive income (loss) before reclassifications 0.1 1.0  
Reclassified from accumulated other comprehensive income (loss) 1.5 1.3  
Other comprehensive income (loss) 1.6 2.3  
Ending balance (4.8) (6.4) (8.7)
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 24.9 12.4  
Other comprehensive income (loss) (49.1) 12.5 25.7
Ending balance $ (24.2) $ 24.9 $ 12.4