Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Schedule of income (loss) from continuing operations before income taxes and (provision for) benefit from income taxes

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

	Year ended December 31,
	2017			2016			2015
Income (loss) from continuing operations:
United States	$	68.8		$	14.0		$	(14.2	)
Foreign	(32.7		)	25.4			(140.1		)
	$	36.1		$	39.4		$	(154.3	)
(Provision for) benefit from income taxes:
Current:
United States	$	30.4		$	(4.3	)	$	10.9
Foreign	(3.5		)	(4.8		)	(3.3		)
Total current	26.9			(9.1		)	7.6
Deferred and other:
United States	23.5			0.2			(10.7		)
Foreign	(2.5		)	(0.2		)	5.8
Total deferred and other	21.0			—			(4.9		)
Total (provision) benefit	$	47.9		$	(9.1	)	$	2.7

Schedule of reconciliation of income tax computed at the U.S. federal statutory tax rate to the effective income tax rate

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,
	2017		2016		2015
Tax at U.S. federal statutory rate	35.0	%	35.0	%	35.0	%
State and local taxes, net of U.S. federal benefit	4.4	%	5.0	%	(0.1	)%
U.S. credits and exemptions	(8.5	)%	(12.9	)%	1.5	%
Foreign earnings/losses taxed at lower rates	(14.9	)%	(5.9	)%	(9.0	)%
Audit settlements with taxing authorities	(0.1	)%	—	%	0.7	%
Adjustments to uncertain tax positions	(9.8	)%	(1.9	)%	(5.4	)%
Changes in valuation allowance	54.4	%	17.4	%	(18.8	)%
Tax on distributions of foreign earnings	—	%	0.7	%	(0.2	)%
Worthless stock deductions and other basis adjustments	(226.3	)%	—	%	(2.4	)%
Disposition of dry cooling business	—	%	(15.6	)%	—	%
U.S. tax reform	32.6	%	—	%	—	%
Other	0.5	%	1.3	%	0.4	%
	(132.7	)%	23.1	%	1.7	%

Schedule of significant components of deferred tax assets and liabilities

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

	As of December 31,
	2017			2016
Deferred tax assets:
NOL and credit carryforwards	$	146.0		$	78.2
Pension, other postretirement and postemployment benefits	41.2			77.2
Payroll and compensation	18.2			22.8
Legal, environmental and self-insurance accruals	25.3			35.1
Working capital accruals	11.5			16.4
Other	17.6			20.7
Total deferred tax assets	259.8			250.4
Valuation allowance	(110.9		)	(75.8		)
Net deferred tax assets	148.9			174.6
Deferred tax liabilities:
Intangible assets recorded in acquisitions	53.9			68.3
Basis difference in affiliates	3.7			10.6
Accelerated depreciation	28.8			40.6
Other	12.9			6.6
Total deferred tax liabilities	99.3			126.1
	$	49.6		$	48.5

Schedule of changes in the balance of unrecognized tax benefits

The aggregate changes in the balance of unrecognized tax benefits for the years ended December 31, 2017, 2016 and 2015 were as follows:

	Year ended December 31,
	2017			2016			2015
Unrecognized tax benefit — opening balance	$	37.9		$	48.8		$	63.3
Gross increases — tax positions in prior period	1.6			3.6			14.1
Gross decreases — tax positions in prior period	(0.3		)	(9.3		)	(7.6		)
Gross increases — tax positions in current period	0.3			0.7			11.3
Settlements	(1.3		)	—			—
Lapse of statute of limitations	(7.1		)	(5.9		)	(4.4		)
Gross decreases — Spin-Off	—			—			(26.7		)
Change due to foreign currency exchange rates	0.2			—			(1.2		)
Unrecognized tax benefit — ending balance	$	31.3		$	37.9		$	48.8