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Stockholders' Equity - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 13,307.6  
Ending balance 16,433.7 $ 13,307.6
Gains (Losses) on Hedge Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (2.5) (2.9)
Other comprehensive income (loss) before reclassifications 5.7 (6.6)
Amounts reclassified from accumulated other comprehensive income (loss) 7.8 7.0
Other comprehensive income (loss), net of tax 13.5 0.4
Ending balance 11.0 (2.5)
Unrealized  Losses on Available-for-Sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (29.7) (154.2)
Other comprehensive income (loss) before reclassifications 15.0 124.6
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 (0.1)
Other comprehensive income (loss), net of tax 15.1 124.5
Ending balance (14.6) (29.7)
Foreign Currency Translation Gains (Losses)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 19.4 (6.6)
Other comprehensive income (loss) before reclassifications (52.5) 26.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Other comprehensive income (loss), net of tax (52.5) 26.0
Ending balance (33.1) 19.4
Employee Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0.6 1.2
Other comprehensive income (loss) before reclassifications (14.9) (0.6)
Amounts reclassified from accumulated other comprehensive income (loss) (0.3) 0.0
Other comprehensive income (loss), net of tax (15.2) (0.6)
Ending balance (14.6) 0.6
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (12.2) (162.5)
Other comprehensive income (loss) before reclassifications (46.7) 143.4
Amounts reclassified from accumulated other comprehensive income (loss) 7.6 6.9
Other comprehensive income (loss), net of tax (39.1) 150.3
Ending balance $ (51.3) $ (12.2)