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Comprehensive Income - Components of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Components of Accumulated other comprehensive income, net of taxes    
Beginning balance $ 4,298.2 $ 4,570.1
Other comprehensive income (loss) before reclassifications (5.0)  
Amounts reclassified 0.2  
Other comprehensive income (loss), net of tax (4.8) 6.3
Ending balance 4,099.0 4,520.5
Total    
Components of Accumulated other comprehensive income, net of taxes    
Beginning balance (253.8)  
Ending balance (258.6)  
Foreign Currency Translation Adjustment    
Components of Accumulated other comprehensive income, net of taxes    
Beginning balance (253.8)  
Other comprehensive income (loss) before reclassifications (5.7)  
Amounts reclassified 0.0  
Other comprehensive income (loss), net of tax (5.7) 5.6
Ending balance (259.5)  
Realized and Unrealized Gains on Derivative Financial Instruments    
Components of Accumulated other comprehensive income, net of taxes    
Beginning balance 0.4  
Other comprehensive income (loss) before reclassifications 0.3  
Amounts reclassified 0.2  
Other comprehensive income (loss), net of tax 0.5 0.3
Ending balance 0.9  
Unrealized Gains (Losses) on Available-for-Sale Debt Securities    
Components of Accumulated other comprehensive income, net of taxes    
Beginning balance (0.4)  
Other comprehensive income (loss) before reclassifications 0.4  
Amounts reclassified 0.0  
Other comprehensive income (loss), net of tax 0.4 $ 0.4
Ending balance $ 0.0