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Income Taxes - Summary of Reconciliation Between Expected Tax Expense and Actual Tax Provision (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]      
Computed “expected” tax expense $ 204.7 $ 187.7 $ 180.1
Increase (decrease) in income tax expense resulting from:      
State income taxes (net of federal income tax benefit) 29.4 [1] 7.2 51.9
Foreign operations   15.6 34.6
Effects of stock based compensation (28.6) (19.4) (5.5)
Effect of valuation allowance (21.7) (6.6) (17.2)
Uncertain tax positions   (32.4) 19.2
Tax credits   (16.9) (13.3)
Other (3.4) (3.2) (0.7)
Total income tax provision $ 176.1 $ 132.0 $ 249.1
[1] State and local taxes in New York, New York City, Illinois, and California for 2025 made up the majority (greater than 50 percent) of the tax effect in this category.