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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Loss from continuing operations before income taxes | Loss from continuing operations before income taxes for the years ended December 31, 2016, 2015 and 2014 consisted of the following:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
U.S. | $ | (49.7 | ) |  | $ | (515.9 | ) |  | $ | 268.9 |
Non-U.S. | (708.6 | ) |  | (1,474.4 | ) |  | (816.8 | )
Total | $ | (758.3 | ) |  | $ | (1,990.3 | ) |  | $ | (547.9 | )
Components of income tax provision (benefit) | Total income tax (benefit) provision for the years ended December 31, 2016, 2015 and 2014 consisted of the following:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Current: |  |  |  |  |  |  |  |
U.S. federal | $ | (12.4 | ) |  | $ | (71.9 | ) |  | $ | 27.1 |
Non-U.S. | 14.4 |  |  | 3.7 |  |  | (61.1 | )
State | 0.5 |  |  | (0.6 | ) |  | 3.3 |
Total current | 2.5 |  |  | (68.8 | ) |  | (30.7 | )
Deferred: |  |  |  |  |  |  |  |
U.S. federal | (82.1 | ) |  | (117.4 | ) |  | 111.0 |
Non-U.S. | (2.3 | ) |  | 15.7 |  |  | 122.3 |
State | (2.1 | ) |  | (5.9 | ) |  | (1.4 | )
Total deferred | (86.5 | ) |  | (107.6 | ) |  | 231.9 |
Total income tax (benefit) provision | $ | (84.0 | ) |  | $ | (176.4 | ) |  | $ | 201.2 |
Reconciliation of the expected statutory federal income tax provision (benefit) to the Company's actual income tax provision | The following is a reconciliation of the expected statutory federal income tax benefit to the Company’s income tax (benefit) provision for the years ended December 31, 2016, 2015 and 2014:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Expected income tax benefit at U.S. federal statutory rate | $ | (265.4 | ) |  | $ | (696.6 | ) |  | $ | (191.7 | )
Changes in valuation allowance, income tax | 2,462.8 |  |  | 462.0 |  |  | 569.4 |
Worthless partnership | (2,204.4 | ) |  | — |  |  | — |
Changes in tax reserves | 2.3 |  |  | (21.4 | ) |  | (81.5 | )
Excess depletion | (37.2 | ) |  | (53.7 | ) |  | (65.3 | )
Foreign earnings repatriation | — |  |  | — |  |  | (71.4 | )
Foreign earnings provision differential | 27.5 |  |  | 146.5 |  |  | 28.8 |
General business tax credits | (14.2 | ) |  | (15.7 | ) |  | (19.2 | )
Minerals resource rent tax, net of federal tax | — |  |  | — |  |  | 16.1 |
Remeasurement of foreign income tax accounts | (0.4 | ) |  | (0.5 | ) |  | (2.7 | )
State income taxes, net of federal tax benefit | (90.2 | ) |  | (20.1 | ) |  | (2.3 | )
Reorganization costs | 29.6 |  |  | — |  |  | — |
Other, net | 5.6 |  |  | 23.1 |  |  | 21.0 |
Total income tax (benefit) provision | $ | (84.0 | ) |  | $ | (176.4 | ) |  | $ | 201.2 |
Tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities | The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities as of December 31, 2016 and 2015 consisted of the following:
| December 31,
| 2016 |  | 2015
| (Dollars in millions)
Deferred tax assets: |  |  |  |  |
Tax loss carryforwards and credits | $ | 4,284.4 |  |  | $ | 1,817.4 |
Accrued postretirement benefit obligations | 364.5 |  |  | 372.4 |
Asset retirement obligations | 163.6 |  |  | 160.9 |
Financial guarantees | 77.9 |  |  | 16.9 |
Employee benefits | 57.0 |  |  | 69.6 |
Payable to voluntary employee beneficiary association for certain Patriot retirees (1) | — |  |  | 52.9 |
Hedge activities | 21.0 |  |  | 26.6 |
Workers’ compensation obligations | 7.5 |  |  | 13.7 |
Other | 2.1 |  |  | 66.7 |
Total gross deferred tax assets | 4,978.0 |  |  | 2,597.1 |
Deferred tax liabilities: |  |  |  |  |
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments | 900.4 |  |  | 966.6 |
Unamortized discount on Convertible Junior Subordinated Debentures | 127.7 |  |  | 130.3 |
Investments and other assets | 86.3 |  |  | 70.1 |
Total gross deferred tax liabilities | 1,114.4 |  |  | 1,167.0 |
Valuation allowance, income tax | (3,881.2 | ) |  | (1,447.3 | )
Net deferred tax liability | $ | (17.6 | ) |  | $ | (17.2 | )
Deferred taxes are classified as follows: |  |  |  |  |
Current deferred income taxes | $ | — |  |  | $ | 49.7 |
Noncurrent deferred income taxes | (17.6 | ) |  | (66.9 | )
Net deferred tax liability | $ | (17.6 | ) |  | $ | (17.2 | )
(1) | Refer to Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation" herein for additional details related to this transaction.
Summary of Income Tax Contingencies [Table Text Block] | Net unrecognized tax benefits (excluding interest and penalties) were recorded as follows in the consolidated balance sheets as of December 31, 2016 and 2015:
| December 31,
| 2016 |  | 2015
| (Dollars in millions)
Deferred income taxes | $ | 8.9 |  |  | $ | 7.9 |
Other noncurrent liabilities | 11.2 |  |  | 11.7 |
Net unrecognized tax benefits | $ | 20.1 |  |  | $ | 19.6 |
Gross unrecognized tax benefits | $ | 20.1 |  |  | $ | 22.9 |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the years ended December 31, 2016, 2015 and 2014 is as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Balance at beginning of period | $ | 22.9 |  |  | $ | 44.5 |  |  | $ | 143.9 |
Additions for current year tax positions | 1.5 |  |  | 2.3 |  |  | 12.0 |
Reductions for prior year tax positions | (2.8 | ) |  | (23.5 | ) |  | — |
Reductions for settlements with tax authorities | (1.5 | ) |  | (0.4 | ) |  | (111.4 | )
Balance at end of period | $ | 20.1 |  |  | $ | 22.9 |  |  | $ | 44.5 |
Summary of Companys tax (refunds) payments | The following table summarizes the Company’s income tax refunds, net for the years ended December 31, 2016, 2015 and 2014:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
U.S. — federal | $ | (56.5 | ) |  | $ | (38.1 | ) |  | $ | (7.7 | )
U.S. — state and local | 1.4 |  |  | 0.4 |  |  | (6.8 | )
Non-U.S. | 15.0 |  |  | 11.9 |  |  | (2.2 | )
Total income tax refunds, net | $ | (40.1 | ) |  | $ | (25.8 | ) |  | $ | (16.7 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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