Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred Tax Assets
Net operating loss carryforwards	$ 68.3	$ 87.8
Deferred compensation	87.2	85.8
Tax credit carryforwards	35.1	31.1
Interest expense carryforwards	43.1	31.0
Accrued expenses	2.1	6.4
Leases	54.7	65.2
Other	39.7	45.1
Total	330.2	352.4
Valuation allowance	(38.4)	(51.4)
Total	291.8	301.0
Deferred Tax Liabilities
Leases	48.0	58.2
Other	12.0	13.7
Depreciable and amortizable property	764.2	837.8
Investments	170.6	171.1
Total	994.8	1,080.8
Total	$ 994.8	$ 1,080.8