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Comprehensive Income - Components of AOCL (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance $ 4,262.7 $ 4,368.4 $ 4,570.1 $ 4,175.6
Other comprehensive income before reclassifications     43.8  
Amounts reclassified     0.6  
Other comprehensive income (loss), net of tax 40.2 (30.3) 44.4 21.5
Ending balance 4,274.0 4,464.2 4,274.0 4,464.2
Total        
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance     (255.9)  
Ending balance (211.5)   (211.5)  
Foreign Currency Translation Adjustment        
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance     (255.3)  
Other comprehensive income before reclassifications     42.6  
Amounts reclassified     0.0  
Other comprehensive income (loss), net of tax 39.2 (30.6) 42.6 20.6
Ending balance (212.7)   (212.7)  
Realized and Unrealized Gains (Losses) on Derivative Financial Instruments        
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance     (0.1)  
Other comprehensive income before reclassifications     0.8  
Amounts reclassified     0.6  
Other comprehensive income (loss), net of tax 1.0 (0.3) 1.4 0.5
Ending balance 1.3   1.3  
Unrealized Gains (Losses) on Investment Available-for-Sale Debt Securities        
Components of Accumulated other comprehensive income, net of taxes        
Beginning balance     (0.5)  
Other comprehensive income before reclassifications     0.4  
Amounts reclassified     0.0  
Other comprehensive income (loss), net of tax 0.0 $ 0.6 0.4 $ 0.4
Ending balance $ (0.1)   $ (0.1)