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Comprehensive Income - Components of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance $ 4,138.7 $ 4,262.7 $ 4,298.2 $ 4,570.1
Other comprehensive income before reclassifications     69.2  
Amounts reclassified     0.2  
Other comprehensive income, net of tax 10.5 40.2 69.4 44.4
Ending balance 4,266.5 4,274.0 4,266.5 4,274.0
Total        
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance     (253.8)  
Ending balance (184.4)   (184.4)  
Foreign Currency Translation Adjustment        
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance     (253.8)  
Other comprehensive income before reclassifications     68.7  
Amounts reclassified     0.0  
Other comprehensive income, net of tax 11.0 39.2 68.7 42.6
Ending balance (185.1)   (185.1)  
Realized and Unrealized Gains on Derivative Financial Instruments        
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance     0.4  
Other comprehensive income before reclassifications     0.1  
Amounts reclassified     0.2  
Other comprehensive income, net of tax (0.5) 1.0 0.3 1.4
Ending balance 0.7   0.7  
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 before reclassifications     0.4  
Amounts reclassified     0.0  
Other comprehensive income, net of tax 0.0 $ 0.0 0.4 $ 0.4
Ending balance $ 0.0   $ 0.0