Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Income (Loss) from Continuing Operations Before Income Taxes and (Provision for) Benefit from Income Taxes

Income from continuing operations before income taxes and the (provision for) benefit from income taxes consisted of the following:

	Year ended December 31,
	2020		2019		2018
Income from continuing operations:
United States	$	89.5	$	89.4	$	74.5
Foreign	27.0		(4.4)		10.0
	$	116.5	$	85.0	$	84.5
(Provision for) benefit from income taxes:
Current:
United States	$	(0.7)	$	6.8	$	1.5
Foreign	(3.8)		(5.5)		(3.2)
Total current	(4.5)		1.3		(1.7)
Deferred and other:
United States	(11.3)		(14.2)		(0.6)
Foreign	—		(1.0)		(0.3)
Total deferred and other	(11.3)		(15.2)		(0.9)
Total provision	$	(15.8)	$	(13.9)	$	(2.6)

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation of income tax computed at the U.S. federal statutory tax rate to our effective income tax rate was as follows:

	Year ended December 31,
	2020		2019		2018
Tax at U.S. federal statutory rate	21.0	%	21.0	%	21.0	%
State and local taxes, net of U.S. federal benefit	3.2	%	3.2	%	2.9	%
U.S. credits and exemptions	(3.7)	%	(4.9)	%	(3.8)	%
Foreign earnings/losses taxed at different rates	(3.1)	%	(7.6)	%	(1.1)	%
Nondeductible expenses	1.5	%	2.6	%	2.4	%
Adjustments to uncertain tax positions	(3.0)	%	(0.5)	%	(8.4)	%
Changes in valuation allowance	1.0	%	5.4	%	(8.0)	%
Share-based compensation	(2.5)	%	(2.2)	%	(2.2)	%
U.S. tax reform	—	%	—	%	(0.8)	%
Other	(0.8)	%	(0.6)	%	1.1	%
	13.6	%	16.4	%	3.1	%

Schedule of Deferred Tax Assets and Liabilities

Significant components of our deferred tax assets and liabilities were as follows:

	As of December 31,
	2020		2019
Deferred tax assets:
NOL and credit carryforwards	$	142.0	$	145.7
Pension, other postretirement and postemployment benefits	36.5		36.4
Payroll and compensation	17.1		19.0
Legal, environmental and self-insurance accruals	22.6		21.3
Working capital accruals	13.9		11.5
Other	7.9		7.1
Total deferred tax assets	240.0		241.0
Valuation allowance	(92.0)		(93.6)
Net deferred tax assets	148.0		147.4
Deferred tax liabilities:
Intangible assets recorded in acquisitions	74.9		75.1
Basis difference in affiliates	16.3		14.0
Accelerated depreciation	25.7		22.4
Deferred income	29.4		23.0
Other	4.2		1.6
Total deferred tax liabilities	150.5		136.1
	$	(2.5)	$	11.3

Schedule of Changes in Unrecognized Tax Benefits

The aggregate changes in the balance of unrecognized tax benefits for the years ended December 31, 2020, 2019 and 2018 were as follows:

	Year ended December 31,
	2020		2019		2018
Unrecognized tax benefit — opening balance	$	17.2	$	20.3	$	31.3
Gross increases — tax positions in prior period	0.3		1.1		0.6
Gross decreases — tax positions in prior period	(2.2)		(0.8)		(2.4)
Gross increases — tax positions in current period	0.2		0.2		0.7
Settlements	(0.3)		(2.1)		—
Lapse of statute of limitations	(1.7)		(1.5)		(9.8)
Change due to foreign currency exchange rates	0.1		—		(0.1)
Unrecognized tax benefit — ending balance	$	13.6	$	17.2	$	20.3