Lease Accounting - Schedule of Aggregate Lease Costs by Lease Classification (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Lease Cost [Line Items]
Total operating lease costs		$ 80.7	$ 81.4
Total finance lease costs		5.3	4.5
Depreciation and Amortization
Lease Cost [Line Items]
Amortization of leased assets		3.6	3.1
Interest Expense
Lease Cost [Line Items]
Interest on lease liabilities		1.7	1.4
Equipment | Utilities and Other
Lease Cost [Line Items]
Total operating lease costs	[1]	0.9	0.8
Real Estate | Facility Lease Expense
Lease Cost [Line Items]
Total operating lease costs	[1]	$ 79.8	$ 80.6

[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: