Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Stock-based compensation expense	$ 6.7	$ 7.6
Accrued expenses	156.5	128.6
Financing and operating leasing obligations	2,185.6	2,292.8
Unrecognized tax benefits	9.5	9.9
Investments in and advances to unconsolidated affiliates	15.5	15.2
Discount on convertible notes	0.2	0.3
Net operating losses and tax credit carryforwards	171.8	138.4
Capital loss carryforwards	127.2	126.1
Interest limitation carryforwards	26.7	12.1
Gross deferred tax assets	2,699.7	2,731.0
Less: Valuation allowance	(268.0)	(210.5)
Net deferred tax assets	2,431.7	2,520.5
Deferred tax liabilities:
Property and equipment, not subject to the Master Leases	(73.6)	(123.9)
Property and equipment, subject to the Master Leases	(593.4)	(635.0)
Intangible assets	(298.4)	(259.1)
Lease right-of-use assets	(1,527.3)	(1,620.1)
Net deferred tax liabilities	(2,492.7)	(2,638.1)
Long-term deferred tax liabilities, net	$ (61.0)	$ (117.6)