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Lease Accounting - Schedule of Aggregate Lease Costs by Lease Classification (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Lease Cost [Line Items]
Total operating lease costs		$ 85.3	$ 89.1	$ 252.1	$ 255.3
Total finance lease costs		5.2	4.8	15.8	14.2
Depreciation and Amortization
Lease Cost [Line Items]
Amortization of leased assets		3.6	3.5	10.8	10.0
Interest Expense
Lease Cost [Line Items]
Interest on lease liabilities		1.6	1.3	5.0	4.2
Equipment | Utilities and Other
Lease Cost [Line Items]
Total operating lease costs	[1]	1.0	1.2	3.1	2.8
Real Estate | Facility Lease Expense
Lease Cost [Line Items]
Total operating lease costs	[1]	$ 84.3	$ 87.9	$ 249.0	$ 252.5
[1] Includes short-term lease payments, variable lease payments and office and equipment lease payments reflected in general and administrative expense as set forth in the following table for the periods presented:

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Amount of interest expense on finance lease liability.

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