Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Components of Deferred Tax Assets (Liabilities)

Deferred tax assets (liabilities) were comprised of the following at December 31:

(in millions)	2022			2021(a)
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		—			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

a)Certain reclasses have been made to the 2021 balances in this table to conform to the 2022 presentation.

Reconciliation between Federal Statutory Tax Rate and Consolidated Effective Tax Rate

A reconciliation between income taxes at the federal statutory rate and the consolidated effective tax rate follows for the years ended December 31:

	2022			2021			2020
Federal statutory rate		21.0	%		21.0	%		21.0	%
State income taxes, net		6.0	%		(1.1	%)		(1.2	%)
Foreign tax rate differential		5.6	%		(1.3	%)		(1.0	%)
Non-deductible debt costs		8.7	%		(2.2	%)		(1.6	%)
Non-deductible compensation		4.6	%		(0.5	%)		(1.0	%)
Other permanent differences		4.9	%		(0.3	%)		0.3	%
Effect of law and rate changes		(54.8	%)		(4.6	%)		(4.6	%)
Valuation allowance		21.0	%		(14.1	%)		(15.1	%)
Benefit from intraperiod tax allocation		(—	%)		—	%		20.0	%
Net change in unrecognized tax benefits		(0.1	)%		0.3	%		8.9	%
Other, net (primarily prior year return to provision)		0.8	%		(0.1	%)		1.1	%
Effective tax rate		17.7	%		(2.9	%)		26.8	%

Summary of Income Tax Provision (Benefit)

The income tax provision (benefit) consisted of the following for the years ended December 31:

(in millions)	2022			2021			2020
Current:
Federal	$	—		$	—		$	(6.2	)
State		2.4			1.4			0.4
Foreign		2.7			2.2			1.1
Current income tax expense (benefit)		5.1			3.6			(4.7	)
Deferred:
Federal		—			—			(9.4	)
State		—			—			(5.2	)
Foreign		(0.4	)		(0.5	)		(0.3	)
Deferred income tax benefit		(0.4	)		(0.5	)		(14.9	)
Income tax expense (benefit)	$	4.7		$	3.1		$	(19.6	)
Based on the income (loss) before income taxes:
Domestic	$	19.0		$	(111.3	)	$	(77.4	)
Foreign		7.5			5.3			4.3
Income (Loss) before income taxes	$	26.5		$	(106.0	)	$	(73.1	)

Schedule of Unrecognized Tax Benefits [Roll Forward]

A rollforward of the total amount of unrecognized tax benefits for the years ended December 31 is as follows:

(in millions)	2022			2021
Unrecognized tax benefits at January 1	$	40.4		$	40.7
Increases related to:
Tax positions taken during a prior period		0.1			—
Tax positions taken during the current period		0.3			0.3
Decreases related to:
Tax positions taken during a prior period		—			—
Lapse of applicable statute of limitations		(7.3	)		(0.6	)
Unrecognized tax benefits at December 31	$	33.5		$	40.4

Summary of Tax Years Remain Subject to Examination

Tax years that remain subject to examination for our major tax jurisdictions as of December 31, 2022:

Statute remains open	2014-2021
Tax years not examined	2014-2022