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Income Taxes - Reconciliation of Liability for Uncertain Tax Positions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward]      
Balance at the beginning of the year $ 233.5 $ 174.7 $ 147.0
Additions for tax positions related to the current year 37.2 32.1 29.3
Additions for tax positions of prior years 18.1 34.0 2.1
Reductions for tax positions of prior years (22.8) (0.6) (1.0)
Reductions related to settlements with taxing authorities (1.3) (0.1) (0.2)
Reductions due to statute expirations (63.1) (6.6) (2.5)
Balance at the end of the year $ 201.6 $ 233.5 $ 174.7