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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 | $ | (663.8 | ) |  | $ | (1,783.2 | ) |  | $ | (695.3 | )
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 | (94.5 | ) |  | (207.1 | ) |  | 147.4 |
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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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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