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Segment and Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,440.8 | $ 1,207.1 | $ 1,040.2 | $ 1,027.2 | $ 1,313.1 |  |  | $ 1,418.9 | $ 1,339.3 | $ 1,537.9 | $ 3,564.7 | $ 4,715.3 | $ 5,609.2 | $ 6,792.2
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 492.2 | 434.6 | 814.0
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  | 106.7 | 126.6 | 126.8 | 194.4
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | (249.0) | 277.2 | 276.7
Loss from equity affiliates | (28.8) |  |  |  |  |  |  |  |  |  | 26.2 | (16.2) | 15.9 | 107.6
Total assets | 11,777.7 |  |  |  | 10,946.9 |  |  |  |  |  | 11,777.7 | 11,777.7 | 10,946.9 | 13,191.1
Property, plant, equipment and mine development, net | 8,776.7 |  |  |  | 9,258.5 |  |  |  |  |  | 8,776.7 | 8,776.7 | 9,258.5 | 10,577.3
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 492.2 | 434.6 | 814.0
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | (336.7) | (465.4) | (572.2) | (655.7)
Asset retirement obligation expenses |  |  |  |  |  |  |  |  |  |  | (26.9) | (41.8) | (45.5) | (81.0)
Selling and Administrative expenses related to debt restructuring |  |  |  |  |  |  |  |  |  |  |  | 21.5 | 0.0 | 0.0
Asset impairment | (230.7) |  |  | (17.2) | (377.0) | $ (900.8) |  |  |  |  | (230.7) | (247.9) | (1,277.8) | (154.4)
Amortization of basis related to equity affiliates |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 4.9 | 5.7
Interest expense |  |  |  |  |  |  |  |  |  |  |  | (298.6) | 465.4 | (426.6)
Loss on early debt extinguishment | (29.5) |  |  |  |  | 8.3 | $ 59.5 |  |  |  | (29.5) | 29.5 | 67.8 | 1.6
Interest income |  |  |  |  |  |  |  |  |  |  | 4.0 | 5.7 | 7.7 | 15.4
Reorganization Items | (33.9) | (29.7) | (95.4) |  |  |  |  |  |  |  | (159.0) | (159.0) | 0.0 | 0.0
Income tax benefit (provision) |  |  |  |  | (7.9) | $ (67.4) |  |  |  |  | 22.7 | 94.5 | 207.1 | (147.4)
Loss from continuing operations, net of income taxes | (175.2) | $ (97.7) | $ (223.2) | $ (167.7) | (502.0) |  |  | $ (126.4) | $ (1,006.0) | $ (148.8) | (423.6) | $ (663.8) | $ (1,783.2) | $ (695.3)
Revenue from external customers by geographic region |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
U.S. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by geographic region |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage |  |  |  |  |  |  |  |  |  |  |  | 54.70% | 57.40% | 59.50%
Japan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by geographic region |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage |  |  |  |  |  |  |  |  |  |  |  | 6.90% | 8.10% | 9.50%
China [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by geographic region |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage |  |  |  |  |  |  |  |  |  |  |  | 5.40% | 7.10% | 6.10%
South Korea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by geographic region |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 4.10% | 5.20%
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from external customers by geographic region |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue percentage |  |  |  |  |  |  |  |  |  |  |  | 31.50% | 23.30% | 19.70%
Powder River Basin Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | $ 1,473.3 | $ 1,865.9 | $ 1,922.9
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 379.9 | 482.9 | 509.0
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  |  | 33.0 | 15.0 | 19.7
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | 248.4 | 276.9 | 276.5
Loss from equity affiliates |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 379.9 | 482.9 | 509.0
Midwestern U.S. Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 792.5 | 981.2 | 1,198.1
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 217.3 | 269.7 | 306.9
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  |  | 18.7 | 51.3 | 57.4
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from equity affiliates |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 217.3 | 269.7 | 306.9
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | (40.2) |
Western U.S. Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 526.0 | 682.3 | 902.8
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 101.6 | 184.6 | 266.9
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  |  | 20.8 | 19.3 | 18.2
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | 0.6 | 0.3 | 0.2
Loss from equity affiliates |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 101.6 | 184.6 | 266.9
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  |  | (2.7)
Australian Metallurgical Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1,090.4 | 1,181.9 | 1,613.8
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | (16.3) | (18.2) | (151.1)
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  |  | 29.9 | 25.5 | 53.9
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from equity affiliates |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | (16.3) | (18.2) | (151.1)
Australian Thermal Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 824.9 | 823.5 | 1,058.0
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 217.6 | 193.6 | 264.1
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  |  | 22.1 | 13.6 | 30.2
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from equity affiliates |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 217.6 | 193.6 | 264.1
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | (17.5) | (11.9)
Trading and Brokerage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | (10.9) | 42.8 | 58.4
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | (72.2) | 27.0 | 14.9
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from equity affiliates |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total assets | 128.7 |  |  |  | 217.2 |  |  |  |  |  | 128.7 | 128.7 | 217.2 | 300.7
Property, plant, equipment and mine development, net | 0.2 |  |  |  | 0.5 |  |  |  |  |  | 0.2 | 0.2 | 0.5 | 1.1
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | (72.2) | 27.0 | 14.9
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 19.1 | 31.6 | 38.2
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | (335.7) | (705.0) | (396.7)
Additions to property, plant, equipment, and mine development |  |  |  |  |  |  |  |  |  |  |  | 2.1 | 2.1 | 15.0
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from equity affiliates |  |  |  |  |  |  |  |  |  |  |  | (16.2) | 15.9 | 107.6
Total assets | 1,990.9 |  |  |  | 1,304.0 |  |  |  |  |  | 1,990.9 | 1,990.9 | 1,304.0 | 2,167.4
Property, plant, equipment and mine development, net | 900.1 |  |  |  | 933.9 |  |  |  |  |  | 900.1 | 900.1 | 933.9 | 1,332.6
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | (335.7) | (705.0) | (396.7)
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | (544.9) | (73.1)
U.S Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 4,255.9 |  |  |  | 4,105.8 |  |  |  |  |  | 4,255.9 | 4,255.9 | 4,105.8 | 4,099.1
Property, plant, equipment and mine development, net | 3,970.6 |  |  |  | 3,854.5 |  |  |  |  |  | 3,970.6 | 3,970.6 | 3,854.5 | 3,739.9
Australian Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating segment results |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 5,402.2 |  |  |  | 5,319.9 |  |  |  |  |  | 5,402.2 | 5,402.2 | 5,319.9 | 6,623.9
Property, plant, equipment and mine development, net | $ 3,905.8 |  |  |  | $ 4,469.6 |  |  |  |  |  | $ 3,905.8 | 3,905.8 | 4,469.6 | 5,503.7
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment |  |  |  |  |  |  |  |  |  |  |  |  | (675.2) | (66.7)
Middlemount Mine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances and Reserves, Balance |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.3
Reconciliation Of Adjusted EBITDA To Consolidated Loss From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in deferred tax asset valuation allowance related to equity affiliates |  |  |  |  |  |  |  |  |  |  |  | $ (7.5) | $ (1.0) | $ 52.3

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