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Summary of Significant Accounting Policies - Schedule of Components of Accumulated Other Comprehensive Income (loss) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total $ 6,845.1 $ 6,717.6 $ 6,347.6 $ 6,335.4 $ 5,729.4 $ 5,784.5
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total (196.5) $ (189.5) (329.8) $ (265.9) $ (324.0) $ (297.3)
Currency translation adjustments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total (192.4)   (327.9)      
Unrealized losses on defined benefit plans            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Total $ (4.1)   $ (1.9)