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Segment and Geographic Information Segment Results (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 0.0 |  |  |  | $ 1,326.2 | $ 1,326.2 | $ 1,440.8 | $ 1,207.1 | $ 1,040.2 | $ 1,027.2 |  | $ 4,715.3 | $ 5,609.2
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 341.3 |  |  |  |  |  |  | 532.0 | 432.4
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 32.8 |  |  |  |  |  |  | 126.6 | 126.8
Federal coal lease expenditures |  |  |  |  | 0.5 |  |  |  |  |  |  | 249.0 | 277.2
(Income) loss from equity affiliates |  |  |  |  | (15.0) | $ (15.0) | $ (28.8) |  |  |  |  | (16.2) | 15.9
Predecessor | Powder River Basin Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 394.3 |  |  |  |  |  |  | 1,473.3 | 1,865.9
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 91.7 |  |  |  |  |  |  | 379.9 | 482.9
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 19.3 |  |  |  |  |  |  | 33.0 | 15.0
Federal coal lease expenditures |  |  |  |  | 0.0 |  |  |  |  |  |  | 248.4 | 276.9
(Income) loss from equity affiliates |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
Predecessor | Midwestern U.S. Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 193.2 |  |  |  |  |  |  | 792.5 | 981.2
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 50.0 |  |  |  |  |  |  | 217.3 | 269.7
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 2.8 |  |  |  |  |  |  | 18.7 | 51.3
Federal coal lease expenditures |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
(Income) loss from equity affiliates |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
Predecessor | Western U.S. Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 149.7 |  |  |  |  |  |  | 526.0 | 682.3
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 50.0 |  |  |  |  |  |  | 101.6 | 184.6
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 3.1 |  |  |  |  |  |  | 20.8 | 19.3
Federal coal lease expenditures |  |  |  |  | 0.5 |  |  |  |  |  |  | 0.6 | 0.3
(Income) loss from equity affiliates |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
Predecessor | Australian Metallurgical Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 328.9 |  |  |  |  |  |  | 1,090.4 | 1,181.9
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 109.6 |  |  |  |  |  |  | (16.3) | (18.2)
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 5.2 |  |  |  |  |  |  | 29.9 | 25.5
Federal coal lease expenditures |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
(Income) loss from equity affiliates |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
Predecessor | Australian Thermal Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 224.8 |  |  |  |  |  |  | 824.9 | 823.5
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 75.6 |  |  |  |  |  |  | 217.6 | 193.6
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 2.3 |  |  |  |  |  |  | 22.1 | 13.6
Federal coal lease expenditures |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
(Income) loss from equity affiliates |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
Predecessor | Trading and Brokerage |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 15.0 |  |  |  |  |  |  | 28.9 | 40.6
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | 8.8 |  |  |  |  |  |  | (32.4) | 24.8
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
Federal coal lease expenditures |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
(Income) loss from equity affiliates |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
Predecessor | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 20.3 |  |  |  |  |  |  | (20.7) | 33.8
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  | (44.4) |  |  |  |  |  |  | (335.7) | (705.0)
Payments to Acquire Property, Plant, and Equipment |  |  |  |  | 0.1 |  |  |  |  |  |  | 2.1 | 2.1
Federal coal lease expenditures |  |  |  |  | 0.0 |  |  |  |  |  |  | 0.0 | 0.0
(Income) loss from equity affiliates |  |  |  |  | $ (15.0) |  |  |  |  |  |  | $ (16.2) | $ 15.9
Successor |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 1,517.1 | $ 1,477.2 | $ 1,258.3 |  |  |  |  |  |  | $ 4,252.6 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | 1,145.3 |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 166.6 |  |
Federal coal lease expenditures |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
(Income) loss from equity affiliates |  | $ (22.8) | $ (10.5) | $ (15.7) |  |  |  |  |  |  | (49.0) |  |
Successor | Powder River Basin Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 1,178.7 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | 278.8 |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 32.6 |  |
(Income) loss from equity affiliates |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Successor | Midwestern U.S. Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 592.3 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | 124.4 |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 21.7 |  |
(Income) loss from equity affiliates |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Successor | Western U.S. Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 440.7 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | 131.8 |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 13.8 |  |
(Income) loss from equity affiliates |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Successor | Australian Metallurgical Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 1,221.0 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | 414.9 |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 56.0 |  |
(Income) loss from equity affiliates |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Successor | Australian Thermal Mining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 772.5 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | 306.6 |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 39.2 |  |
(Income) loss from equity affiliates |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Successor | Trading and Brokerage |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 33.6 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | (6.9) |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
(Income) loss from equity affiliates |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Successor | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 13.8 |  |
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization |  |  |  |  |  |  |  |  |  |  | (104.3) |  |
Payments to Acquire Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  | 3.3 |  |
(Income) loss from equity affiliates |  |  |  |  |  |  |  |  |  |  | $ (49.0) |  |

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