Income Taxes - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Provision for income taxes	$ 357.5	$ 430.3	$ 464.8
Effective income tax rate reconciliation, percent	24.40%	24.40%	23.10%
Effective income tax rate reconciliation, prior year income taxes, amount			$ 26.8
Unrecognized tax benefit	$ 60.7	$ 40.7	25.3	$ 22.4
Increase in net income from recognition of unrecognized tax benefits	54.4	37.4
Interest and penalties, net of tax, included in the provision (benefit) for income taxes	(0.2)	(11.1)	$ 0.4
Income tax examination, penalties and interest accrued	22.7	22.2
Valuation allowance	121.2	95.3
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Valuation allowance	0.4	0.4
Net operating loss carryforwards	0.4	0.4
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Valuation allowance	$ 120.7	$ 94.9