Income Taxes - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Tax Credit Carryforward [Line Items]
Provision for income taxes	$ 602.6	$ 628.4	$ 357.5
Effective income tax rate reconciliation, percent	25.80%	23.60%	24.40%
Unrecognized tax benefit	$ 57.4	$ 58.5	$ 60.7	$ 40.7
Increase in net income from recognition of unrecognized tax benefits	49.4	51.9
Interest and penalties expense (benefit)	(1.7)	4.7	$ 0.2
Income tax examination, penalties and interest accrued	14.3	16.0
Valuation allowance	217.7	157.9
Foreign Tax Jurisdiction
Tax Credit Carryforward [Line Items]
Valuation allowance	217.3	157.5
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Valuation allowance	0.4	0.4
Net operating loss carryforwards	$ 0.4	$ 0.4