Lease Accounting - Schedule of Aggregate Lease Costs by Lease Classification (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Lease Cost [Line Items]
Operating Lease, Cost		$ 81.4	$ 83.5
Total finance lease costs		4.5	4.2
Depreciation and Amortization
Lease Cost [Line Items]
Amortization of leased assets		3.1	3.0
Interest Expense
Lease Cost [Line Items]
Interest on lease liabilities		1.4	1.2
Equipment | Utilities and Other
Lease Cost [Line Items]
Operating Lease, Cost	[1]	0.8	1.4
Real Estate | Facility Lease Expense
Lease Cost [Line Items]
Operating Lease, Cost	[1]	$ 80.6	$ 82.1

[1] Includes short-term lease payments, variable lease payments and office lease payments reflected in general and administrative expense as set forth in the following table for the periods presented:       Three Months Ended       March 31,   Lease Cost Classification 2024     2023   Operating lease costs             Equipment - Short-term and variable lease payments Utilities and other $ 0.7     $ 1.3   Real Estate - Variable lease payments (1) Facility lease expense $ 12.2     $ 12.7   Real Estate - Office leases General and administrative $ 0.3     $ 0.3   (1) Represents lease payments that are based on a change in index, such as CPI or inflation, variable payments based on revenue or attendance and variable common area maintenance costs.