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Income Taxes - Reconciliation of Liability for Uncertain Tax Positions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at the beginning of the year $ 174.7 $ 147.0 $ 100.7
Additions for tax positions related to the current year 32.1 29.3 41.4
Additions for tax positions of prior years 34.0 2.1 34.9
Reductions for tax positions of prior years (0.6) (1.0) (1.5)
Reductions related to settlements with taxing authorities (0.1) (0.2) (0.1)
Reductions due to statute expirations (6.6) (2.5) (28.4)
Balance at the end of the year $ 233.5 $ 174.7 $ 147.0