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Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2016
Segment Reporting [Abstract] |
Operating segment results | Segment results for the year ended December 31, 2016 were as follows:
| 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 |  |  | $ | (10.9 | ) |  | $ | 19.1 |  |  | $ | 4,715.3 |
Adjusted EBITDA | 379.9 |  |  | 217.3 |  |  | 101.6 |  |  | (16.3 | ) |  | 217.6 |  |  | (72.2 | ) |  | (335.7 | ) |  | 492.2 |
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:
| 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 |  |  | $ | 42.8 |  |  | $ | 31.6 |  |  | $ | 5,609.2 |
Adjusted EBITDA | 482.9 |  |  | 269.7 |  |  | 184.6 |  |  | (18.2 | ) |  | 193.6 |  |  | 27.0 |  |  | (705.0 | ) |  | 434.6 |
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 |
Segment results for the year ended December 31, 2014 were as follows:
| 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 | $ | 1,922.9 |  |  | $ | 1,198.1 |  |  | $ | 902.8 |  |  | $ | 1,613.8 |  |  | $ | 1,058.0 |  |  | $ | 58.4 |  |  | $ | 38.2 |  |  | $ | 6,792.2 |
Adjusted EBITDA | 509.0 |  |  | 306.9 |  |  | 266.9 |  |  | (151.1 | ) |  | 264.1 |  |  | 14.9 |  |  | (396.7 | ) |  | 814.0 |
Additions to property, plant, equipment and mine development | 19.7 |  |  | 57.4 |  |  | 18.2 |  |  | 53.9 |  |  | 30.2 |  |  | — |  |  | 15.0 |  |  | 194.4 |
Federal coal lease expenditures | 276.5 |  |  | — |  |  | 0.2 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 276.7 |
Loss from equity affiliates | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 107.6 |  |  | 107.6 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] | Assets as of December 31, 2016 were as follows:
| 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:
| 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 |
Assets as of December 31, 2014 were as follows:
| U.S. Mining |  | Australian Mining |  | Trading and Brokerage |  | Corporate and Other |  | Consolidated
| (Dollars in millions)
Total assets | $ | 4,099.1 |  |  | $ | 6,623.9 |  |  | $ | 300.7 |  |  | $ | 2,167.4 |  |  | $ | 13,191.1 |
Property, plant, equipment and mine development, net | 3,739.9 |  |  | 5,503.7 |  |  | 1.1 |  |  | 1,332.6 |  |  | 10,577.3 |
Reconciliation of Adjusted EBITDA to consolidated loss from continuing operations | A reconciliation of consolidated loss from continuing operations, net of income taxes to Adjusted EBITDA follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Loss from continuing operations, net of income taxes | $ | (674.3 | ) |  | $ | (1,813.9 | ) |  | $ | (749.1 | )
Depreciation, depletion and amortization | 465.4 |  |  | 572.2 |  |  | 655.7 |
Asset retirement obligation expenses | 41.8 |  |  | 45.5 |  |  | 81.0 |
Selling and administrative expenses related to debt restructuring | 21.5 |  |  | — |  |  | — |
Asset impairment | 247.9 |  |  | 1,277.8 |  |  | 154.4 |
Change in deferred tax asset valuation allowance related to equity affiliates | (7.5 | ) |  | (1.0 | ) |  | 52.3 |
Amortization of basis difference related to equity affiliates | — |  |  | 4.9 |  |  | 5.7 |
Interest expense | 298.6 |  |  | 465.4 |  |  | 426.6 |
Loss on early debt extinguishment | 29.5 |  |  | 67.8 |  |  | 1.6 |
Interest income | (5.7 | ) |  | (7.7 | ) |  | (15.4 | )
Reorganization items, net | 159.0 |  |  | — |  |  | — |
Income tax (benefit) provision | (84.0 | ) |  | (176.4 | ) |  | 201.2 |
Total Adjusted EBITDA | $ | 492.2 |  |  | $ | 434.6 |  |  | $ | 814.0 |
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:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
U.S. | 54.7 | % |  | 57.4 | % |  | 59.5 | %
Japan | 6.9 | % |  | 8.1 | % |  | 9.5 | %
China | 5.4 | % |  | 7.1 | % |  | 6.1 | %
South Korea | 1.5 | % |  | 4.1 | % |  | 5.2 | %
Other | 31.5 | % |  | 23.3 | % |  | 19.7 | %
Total | 100.0 | % |  | 100.0 | % |  | 100.0 | %

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