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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Components of pre-tax book income (loss)

The components of pre-tax book income (loss) consist of the following:
			Year Ended December 31,
			2020						2019						2018
U.S.			$	(76.7)					$	(15.8)					$	(39.7)
Foreign			(49.6)						(69.7)						(30.9)
Total			$	(126.3)					$	(85.5)					$	(70.6)

Significant components of the income before income tax expense

Significant components of income tax expense consist of the following:
			Year Ended December 31,
			2020						2019						2018
Current:
U.S. federal current expense (benefit)			$	—					$	—					$	0.0
State current expense (benefit)			—						(0.1)						(1.1)
Foreign current expense			4.0						0.1						0.8
Total current expense (benefit)			4.0						(0.0)						(0.3)
Deferred:
U.S. federal deferred benefit			(1.2)						(2.2)						(1.6)
State deferred benefit			—						(0.2)						—
Foreign deferred tax expense (benefit)			(5.9)						(6.0)						1.7
Total deferred expense (benefit)			(7.1)						(8.4)						0.1
Total income tax expense (benefit)			$	(3.1)					$	(8.4)					$	(0.2)

Reconciliation of the statutory U.S. Federal income tax rate to the effective income tax rate on income (loss)

A reconciliation of the statutory U.S. Federal income tax rate to the effective income tax rate on income (loss) is as follows:
			2020						2019						2018
Federal Statutory Rate			21.0		%				21.0		%				21.0		%
Permanent differences			(1.2)						(13.1)						(25.7)
State taxes, net of Federal benefit			—						(0.1)						3.5
Rate change			(0.2)						(3.5)						(0.6)
Foreign earnings taxed at different rates than U.S.			(0.3)						(3.3)						11.8
Valuation allowance			(4.3)						72.8						81.2
Transition tax			—						—						(13.8)
Foreign restructuring			(2.3)						—						—
Foreign dividends			(1.5)						—						—
Net operating loss expiration and remeasurement			(10.8)						(66.2)						(75.8)
Changes in uncertain tax reserves			1.4						1.2						(1.4)
Other			0.6						1.0						0.1
Effective tax rate			2.4		%				9.8		%				0.3		%

Significant components of deferred tax assets and liabilities

The significant components of our deferred tax assets and liabilities as of December 31 are as follows:  

			2020						2019
Deferred tax assets:
Accrued postretirement benefit cost			$	38.9					$	39.3
Accrued liabilities			7.2						10.8
Share-based compensation			0.7						0.9
Net operating losses and tax credits			430.3						432.8
Foreign basis differences			16.2						15.0
Ravenswood retiree legal settlement			1.7						1.9
Other			10.1						2.8
Total deferred tax assets			505.1						503.5
Valuation allowance			(499.4)						(492.4)
Net deferred tax assets			$	5.7					$	11.1
Deferred tax liabilities:
Derivatives			$	—					$	(3.5)
Tax over financial statement depreciation			(95.0)						(102.4)
Total deferred tax liabilities			(95.0)						(105.9)
Net deferred tax liability			$	(89.3)					$	(94.8)

Changes in valuation allowance

The changes in the valuation allowance are as follows:

			2020						2019						2018
Beginning balance, valuation allowance			$	492.4					$	552.5					$	607.8
Remeasurement of deferred tax assets			—						(41.6)						(32.1)
Release of valuation allowance			—						—						—
Expiration of net operating losses			(11.7)						(10.8)						(12.3)
Other change in valuation allowance			18.7						(7.7)						(11.0)
Ending balance, valuation allowance			$	499.4					$	492.4					$	552.5

Significant components of Net Operating Loss Carryforwards

The significant components of our NOLs are as follows:

			2020						2019
Federal (1)			$	1,572.9					$	1,519.9
State (2)			1,090.7						1,068.3
Foreign (3)			229.4						306.8

(1)The federal NOL begins to expire in 2028.

(2)The state NOLs begin to expire in 2027.

(3)The Icelandic NOL expires between 2021 and 2026.

Reconciliation of beginning and ending amounts of gross unrecognized tax benefits

A reconciliation of the beginning and ending amounts of gross unrecognized tax benefits (excluding interest) is as follows:

			2020						2019						2018
Balance as of January 1,			$	8.2					$	9.5					$	8.4
Additions based on tax positions related to the current year			—						—						2.0
Decreases due to lapse of applicable statute of limitations			(1.7)						(1.3)						(0.9)
Settlements			—						—						—
Balance as of December 31,			$	6.5					$	8.2					$	9.5

Significant components of unrecognized tax positions

The components of our unrecognized tax benefits are as follows:

			2020						2019						2018
Unrecognized tax benefits - Temporary Differences			$	5.1					$	6.8					$	7.9
Other unrecognized tax benefits			1.4						1.4						1.6
Gross unrecognized tax benefits			$	6.5					$	8.2					$	9.5
Accrued interest and penalties related to unrecognized tax benefits			$	—					$	—					$	0.1

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