Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets
Net operating loss carryforwards	$ 87.8	$ 113.4
Deferred compensation	85.8	74.0
Tax credit carryforwards	31.1	29.7
Accrued expenses	6.4	20.7
Leases	65.2	74.7
Other	76.1	81.3
Total	352.4	393.8
Valuation allowance	(51.4)	(67.0)
Total	301.0	326.8
Deferred Tax Liabilities
Leases	58.2	66.4
Other	13.7	15.4
Depreciable and amortizable property	837.8	943.7
Investments	171.1	155.9
Total	1,080.8	1,181.4
Total	$ 1,080.8	$ 1,181.4