Income Taxes - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	[1]
Income Tax Disclosure [Abstract]
Depreciation	$ (146.8)	$ (104.5)
Operating lease right-of-use assets	(35.1)	(42.1)
Other, including debt and interest	(19.5)	(16.4)
Deferred tax liabilities	(201.4)	(163.0)
Claims and insurance	90.6	88.6
Net operating loss carryforwards	229.7	202.5
Section 163(j) interest limitation carryforwards	50.3	11.2
Employee benefit accruals	66.9	55.6
Lease financing obligations	53.3	50.8
Operating lease liabilities	39.3	46.3
Employer payroll taxes	0.0	9.7
Other, including debt and interest	17.1	27.8
Deferred tax assets	547.2	492.5
Valuation allowance	(345.5)	(328.1)
Net deferred tax assets	201.7	164.4
Net deferred tax asset	$ 0.3	$ 1.4

[1] Certain reclasses have been made to the 2021 balances in this table to conform to the 2022 presentation.