Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Components of Deferred Tax Assets (Liabilities)

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

(in millions)	2020			2019
Depreciation	$	(83.8	)	$	(99.5	)
Operating lease right-of-use assets		(65.3	)		(93.7	)
Deferred revenue		(3.3	)		(6.3	)
Intangibles		(2.9	)		(3.4	)
State taxes		(19.6	)		(19.6	)
Other, including debt and interest		(22.3	)		(16.0	)
Deferred tax liabilities		(197.2	)		(238.5	)
Claims and insurance		84.4			89.9
Net operating loss carryforwards		216.7			210.7
Employee benefit accruals		23.9			94.8
Sale/leaseback transactions		53.0			55.5
Operating lease liabilities		68.7			93.8
Employer payroll taxes		20.0			—
Other, including debt and interest		37.0			28.4
Deferred tax assets		503.7			573.1
Valuation allowance		(305.6	)		(334.0	)
Net deferred tax assets		198.1			239.1
Net deferred tax asset	$	0.9		$	0.6

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:

	2020			2019			2018
Federal statutory rate		21.0	%		21.0	%		21.0	%
State income taxes, net		(1.2	%)		(0.7	%)		14.1	%
Foreign tax rate differential		(1.0	%)		(2.6	%)		12.1	%
Permanent differences		(2.3	%)		(0.6	%)		8.3	%
Valuation allowance		(19.7	)%		(17.7	)%		(17.5	)%
Benefit from intraperiod tax allocation		20.0	%		—	%		—	%
Net change in unrecognized tax benefits		8.9	%		0.6	%		(0.9	)%
Other, net (primarily prior year return to provision)		1.1	%		4.0	%		(1.6	)%
Effective tax rate		26.8	%		4.0	%		35.5	%

Summary of Income Tax Provision (Benefit)

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

(in millions)	2020			2019			2018
Current:
Federal	$	(6.2	)	$	—		$	—
State		0.4			(3.3	)		5.4
Foreign		1.1			2.0			6.8
Current income tax expense (benefit)		(4.7	)		(1.3	)		12.2
Deferred:
Federal		(9.4	)		—			—
State		(5.2	)		—			—
Foreign		(0.3	)		(3.0	)		(1.1	)
Deferred income tax benefit		(14.9	)		(3.0	)		(1.1	)
Income tax expense (benefit)	$	(19.6	)	$	(4.3	)	$	11.1
Based on the income (loss) before income taxes:
Domestic	$	(77.4	)	$	(104.7	)	$	13.6
Foreign		4.3			(3.6	)		17.7
Income (Loss) before income taxes	$	(73.1	)	$	(108.3	)	$	31.3

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)	2020			2019
Unrecognized tax benefits at January 1	$	58.5		$	59.2
Increases related to:
Tax positions taken during a prior period		—			—
Tax positions taken during the current period		0.3			0.5
Decreases related to:
Tax positions taken during a prior period		(0.2	)		(0.1	)
Lapse of applicable statute of limitations		(17.9	)		(1.1	)
Unrecognized tax benefits at December 31	$	40.7		$	58.5

Summary of Tax Years Remain Subject to Examination

Tax years that remain subject to examination for our major tax jurisdictions as of December 31, 2020:

Statute remains open	2014-2019
Tax years not examined	2014-2020