Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2016			2015			2014
Income (loss) from continuing operations:
United States	$	14.0		$	(14.2	)	$	366.2
Foreign	25.4			(140.1		)	(114.1		)
	$	39.4		$	(154.3	)	$	252.1
(Provision for) benefit from income taxes:
Current:
United States	$	(4.3	)	$	10.9		$	(200.1	)
Foreign	(4.8		)	(3.3		)	(16.5		)
Total current	(9.1		)	7.6			(216.6		)
Deferred and other:
United States	0.2			(10.7		)	95.7
Foreign	(0.2		)	5.8			(16.6		)
Total deferred and other	—			(4.9		)	79.1
Total (provision) benefit	$	(9.1	)	$	2.7		$	(137.5	)

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,
	2016		2015		2014
Tax at U.S. federal statutory rate	35.0	%	35.0	%	35.0	%
State and local taxes, net of U.S. federal benefit	5.0	%	(0.1	)%	2.7	%
U.S. credits and exemptions	(12.9	)%	1.5	%	(1.3	)%
Foreign earnings/losses taxed at lower rates	(5.9	)%	(9.0	)%	9.2	%
Audit settlements with taxing authorities	—	%	0.7	%	(4.7	)%
Adjustments to uncertain tax positions	(1.9	)%	(5.4	)%	(1.7	)%
Changes in valuation allowance	17.4	%	(18.8	)%	13.4	%
Tax on distributions of foreign earnings	0.7	%	(0.2	)%	4.5	%
Goodwill impairment and basis adjustments	—	%	(2.4	)%	(2.4	)%
Disposition of dry cooling business	(15.6	)%	—	%	—	%
Other	1.3	%	0.4	%	(0.2	)%
	23.1	%	1.7	%	54.5	%

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,
	2016			2015 (1)
Deferred tax assets:
NOL and credit carryforwards	$	78.2		$	85.3
Pension, other postretirement and postemployment benefits	77.2			80.3
Payroll and compensation	22.8			28.8
Legal, environmental and self-insurance accruals	35.1			40.6
Working capital accruals	16.4			15.8
Other	20.7			21.1
Total deferred tax assets	250.4			271.9
Valuation allowance	(75.8		)	(70.9		)
Net deferred tax assets	174.6			201.0
Deferred tax liabilities:
Intangible assets recorded in acquisitions	68.3			81.6
Basis difference in affiliates	10.6			10.3
Accelerated depreciation	40.6			38.9
Other	6.6			23.6
Total deferred tax liabilities	126.1			154.4
	$	48.5		$	46.6

⁽¹⁾  Represents deferred tax assets and liabilities related to both continuing and discontinued operations, with net deferred tax assets associated with discontinued operations totaling $4.1.

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, 2016, 2015 and 2014 were as follows:

	Year ended December 31,
	2016			2015			2014
Unrecognized tax benefit — opening balance	$	48.8		$	63.3		$	128.4
Gross increases — tax positions in prior period	3.6			14.1			3.7
Gross decreases — tax positions in prior period	(9.3		)	(7.6		)	(36.9		)
Gross increases — tax positions in current period	0.7			11.3			11.7
Settlements	—			—			(28.2		)
Lapse of statute of limitations	(5.9		)	(4.4		)	(14.7		)
Gross decreases — Spin-Off	—			(26.7		)	—
Change due to foreign currency exchange rates	—			(1.2		)	(0.7		)
Unrecognized tax benefit — ending balance	$	37.9		$	48.8		$	63.3