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Stockholders' Equity - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 11,041.9  
Ending balance 13,307.6 $ 11,041.9
Gains (Losses) on Hedge Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (2.9) 4.5
Other comprehensive income (loss) before reclassifications (6.6) (35.0)
Amounts reclassified from accumulated other comprehensive income (loss) 7.0 27.6
Other comprehensive income (loss), net of tax 0.4 (7.4)
Ending balance (2.5) (2.9)
Unrealized  Gains (Losses) on Available-for-Sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (154.2) (16.0)
Other comprehensive income (loss) before reclassifications 124.6 (138.2)
Amounts reclassified from accumulated other comprehensive income (loss) (0.1) 0.0
Other comprehensive income (loss), net of tax 124.5 (138.2)
Ending balance (29.7) (154.2)
Foreign Currency Translation Gains (Losses)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (6.6) (7.9)
Other comprehensive income (loss) before reclassifications 26.0 1.3
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Other comprehensive income (loss), net of tax 26.0 1.3
Ending balance 19.4 (6.6)
Employee Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1.2 (4.8)
Other comprehensive income (loss) before reclassifications (0.6) 5.8
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.2
Other comprehensive income (loss), net of tax (0.6) 6.0
Ending balance 0.6 1.2
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (162.5) (24.2)
Other comprehensive income (loss) before reclassifications 143.4 (166.1)
Amounts reclassified from accumulated other comprehensive income (loss) 6.9 27.8
Other comprehensive income (loss), net of tax 150.3 (138.3)
Ending balance $ (12.2) $ (162.5)