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Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Operating segment results | Segment results for the Successor period April 2 through December 31, 2017 were as follows:
| Successor
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Revenues | $ | 1,178.7 |  |  | $ | 592.3 |  |  | $ | 440.7 |  |  | $ | 1,221.0 |  |  | $ | 772.5 |  |  | $ | 33.6 |  |  | $ | 13.8 |  |  | $ | 4,252.6 |
Adjusted EBITDA | 278.8 |  |  | 124.4 |  |  | 131.8 |  |  | 414.9 |  |  | 306.6 |  |  | (6.9 | ) |  | (104.3 | ) |  | 1,145.3 |
Additions to property, plant, equipment and mine development | 32.6 |  |  | 21.7 |  |  | 13.8 |  |  | 56.0 |  |  | 39.2 |  |  | — |  |  | 3.3 |  |  | 166.6 |
Income from equity affiliates | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (49.0 | ) |  | (49.0 | )
Segment results for the Predecessor period January 1 through April 1, 2017 were as follows:
| Predecessor
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Revenues | $ | 394.3 |  |  | $ | 193.2 |  |  | $ | 149.7 |  |  | $ | 328.9 |  |  | $ | 224.8 |  |  | $ | 15.0 |  |  | $ | 20.3 |  |  | $ | 1,326.2 |
Adjusted EBITDA | 91.7 |  |  | 50.0 |  |  | 50.0 |  |  | 109.6 |  |  | 75.6 |  |  | 8.8 |  |  | (44.4 | ) |  | 341.3 |
Additions to property, plant, equipment and mine development | 19.3 |  |  | 2.8 |  |  | 3.1 |  |  | 5.2 |  |  | 2.3 |  |  | — |  |  | 0.1 |  |  | 32.8 |
Federal coal lease expenditures | — |  |  | — |  |  | 0.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.5 |
Income from equity affiliates | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (15.0 | ) |  | (15.0 | )
Segment results for the year ended December 31, 2016 were as follows:
| Predecessor
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Revenues | $ | 1,473.3 |  |  | $ | 792.5 |  |  | $ | 526.0 |  |  | $ | 1,090.4 |  |  | $ | 824.9 |  |  | $ | 28.9 |  |  | $ | (20.7 | ) |  | $ | 4,715.3 |
Adjusted EBITDA | 379.9 |  |  | 217.3 |  |  | 101.6 |  |  | (16.3 | ) |  | 217.6 |  |  | (32.4 | ) |  | (335.7 | ) |  | 532.0 |
Additions to property, plant, equipment and mine development | 33.0 |  |  | 18.7 |  |  | 20.8 |  |  | 29.9 |  |  | 22.1 |  |  | — |  |  | 2.1 |  |  | 126.6 |
Federal coal lease expenditures | 248.4 |  |  | — |  |  | 0.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 249.0 |
Income from equity affiliates | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (16.2 | ) |  | (16.2 | )
Segment results for the year ended December 31, 2015 were as follows:
| Predecessor
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Revenues | $ | 1,865.9 |  |  | $ | 981.2 |  |  | $ | 682.3 |  |  | $ | 1,181.9 |  |  | $ | 823.5 |  |  | $ | 40.6 |  |  | $ | 33.8 |  |  | $ | 5,609.2 |
Adjusted EBITDA | 482.9 |  |  | 269.7 |  |  | 184.6 |  |  | (18.2 | ) |  | 193.6 |  |  | 24.8 |  |  | (705.0 | ) |  | 432.4 |
Additions to property, plant, equipment and mine development | 15.0 |  |  | 51.3 |  |  | 19.3 |  |  | 25.5 |  |  | 13.6 |  |  | — |  |  | 2.1 |  |  | 126.8 |
Federal coal lease expenditures | 276.9 |  |  | — |  |  | 0.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 277.2 |
Loss from equity affiliates | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 15.9 |  |  | 15.9 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] | Assets as of December 31, 2017 were as follows:
| Successor
| U.S. Mining |  | Australian Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Total assets | $ | 3,848.6 |  |  | $ | 2,656.3 |  |  | $ | 99.1 |  |  | $ | 1,577.2 |  |  | $ | 8,181.2 |
Property, plant, equipment and mine development, net | 3,361.0 |  |  | 1,501.7 |  |  | 0.5 |  |  | 248.7 |  |  | 5,111.9 |
Assets as of December 31, 2016 were as follows:
| Predecessor
| U.S. Mining |  | Australian Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Total assets | $ | 4,255.9 |  |  | $ | 5,402.2 |  |  | $ | 128.7 |  |  | $ | 1,990.9 |  |  | $ | 11,777.7 |
Property, plant, equipment and mine development, net | 3,970.6 |  |  | 3,905.8 |  |  | 0.2 |  |  | 900.1 |  |  | 8,776.7 |
Assets as of December 31, 2015 were as follows:
| Predecessor
| U.S. Mining |  | Australian Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Total assets | $ | 4,105.8 |  |  | $ | 5,319.9 |  |  | $ | 217.2 |  |  | $ | 1,304.0 |  |  | $ | 10,946.9 |
Property, plant, equipment and mine development, net | 3,854.5 |  |  | 4,469.6 |  |  | 0.5 |  |  | 933.9 |  |  | 9,258.5 |
Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations | A reconciliation of consolidated income (loss) from continuing operations, net of income taxes to Adjusted EBITDA follows:
| Successor | Predecessor
| April 2 through December 31, 2017 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016 |  | Year Ended December 31, 2015
| (Dollars in millions)
Income (loss) from continuing operations, net of income taxes | $ | 713.1 |  | $ | (195.5 | ) |  | $ | (663.8 | ) |  | $ | (1,783.2 | )
Depreciation, depletion and amortization | 521.6 |  | 119.9 |  |  | 465.4 |  |  | 572.2 |
Asset retirement obligation expenses | 41.2 |  | 14.6 |  |  | 41.8 |  |  | 45.5 |
Selling and administrative expenses related to debt restructuring | — |  | — |  |  | 21.5 |  |  | — |
Net mark-to-market adjustment on actuarially determined liabilities | (45.2 | ) | — |  |  | — |  |  | — |
Asset impairment | — |  | 30.5 |  |  | 247.9 |  |  | 1,277.8 |
Changes in deferred tax asset valuation allowance and amortization of basis difference related to equity affiliates | (17.3 | ) | (5.2 | ) |  | (7.5 | ) |  | 3.9 |
Interest expense | 119.7 |  | 32.9 |  |  | 298.6 |  |  | 465.4 |
Loss on early debt extinguishment | 20.9 |  | — |  |  | 29.5 |  |  | 67.8 |
Interest income | (5.6 | ) | (2.7 | ) |  | (5.7 | ) |  | (7.7 | )
Break fees related to terminated asset sales | (28.0 | ) | — |  |  | — |  |  | — |
Unrealized losses on non-coal trading derivative contracts | 1.5 |  | — |  |  | — |  |  | — |
Unrealized losses (gains) on economic hedges | 23.0 |  | (16.6 | ) |  | 39.8 |  |  | (2.2 | )
Coal inventory revaluation | 67.3 |  | — |  |  | — |  |  | — |
Take-or-pay contract-based intangible recognition | (22.5 | ) | — |  |  | — |  |  | — |
Reorganization items, net | — |  | 627.2 |  |  | 159.0 |  |  | — |
Gain on disposal of reclamation liability | (31.2 | ) | — |  |  | — |  |  | — |
Gain on disposal of Burton Mine | (52.2 | ) | — |  |  | — |  |  | — |
Income tax benefit | (161.0 | ) | (263.8 | ) |  | (94.5 | ) |  | (207.1 | )
Total Adjusted EBITDA | $ | 1,145.3 |  | $ | 341.3 |  |  | $ | 532.0 |  |  | $ | 432.4 |
Revenues as a percent of total revenue from external customers by geographic region | The following table presents revenues as a percent of total revenue from external customers by geographic region:
| Successor | Predecessor
| April 2 through December 31, 2017 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016 |  | Year Ended December 31, 2015
U.S. | 48.9 | % | 55.2 | % |  | 54.7 | % |  | 57.4 | %
Japan | 11.7 | % | 11.4 | % |  | 6.9 | % |  | 8.1 | %
Taiwan | 8.7 | % | 5.7 | % |  | 4.6 | % |  | 3.5 | %
China | 7.5 | % | 5.6 | % |  | 5.4 | % |  | 7.1 | %
India | 6.7 | % | 2.7 | % |  | 3.0 | % |  | 4.0 | %
Australia | 5.3 | % | 4.2 | % |  | 4.2 | % |  | 3.0 | %
South Korea | 1.1 | % | 0.5 | % |  | 1.5 | % |  | 4.1 | %
Other | 10.1 | % | 14.7 | % |  | 19.7 | % |  | 12.8 | %
Total | 100.0 | % | 100.0 | % |  | 100.0 | % |  | 100.0 | %

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