Income Taxes - Summary of Reconciliation Between Expected Tax Expense and Actual Tax Provision (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 187.7	$ 180.1	$ 184.0
Increase (decrease) in income tax expense resulting from:
State income taxes (net of federal income tax benefit)	7.2	51.9	49.5
Foreign operations	15.6	34.6	8.7
Effects of stock based compensation	(19.4)	(5.5)	(9.3)
Effect of valuation allowance	(6.6)	(17.2)	8.5
Uncertain tax positions	(32.4)	19.2	(7.9)
Tax credits	(16.9)	(13.3)	(2.0)
Change in rate	0.0	0.0	0.2
Other	(3.2)	(0.7)	(4.6)
Provision for income taxes	$ 132.0	$ 249.1	$ 227.1