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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue Recognition [Abstract] |
Schedule of Accounts Receivable [Table Text Block] | Accounts receivable, net” at September 30, 2018 and December 31, 2017 consisted of the following:
| September 30, 2018 |  | December 31, 2017
| (Dollars in millions)
Trade receivables, net | $ | 345.9 |  |  | $ | 504.2 |
Miscellaneous receivables, net | 99.0 |  |  | 47.9 |
Accounts receivable, net | $ | 444.9 |  |  | $ | 552.1 |
Disaggregation of Revenue by Product Type and Market [Table Text Block] | With respect to its Australian Mining segments, the Company classifies as “Export” certain revenue from domestically-delivered coal under contracts in which the price is derived on a basis similar to export contracts.
| Successor
| Three Months Ended September 30, 2018
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 373.7 |  |  | $ | 208.4 |  |  | $ | 149.5 |  |  | $ | — |  |  | $ | 37.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 769.0 |
Export | — |  |  | — |  |  | 3.1 |  |  | — |  |  | 267.7 |  |  | — |  |  | — |  |  | 270.8 |
Total thermal | 373.7 |  |  | 208.4 |  |  | 152.6 |  |  | — |  |  | 305.1 |  |  | — |  |  | — |  |  | 1,039.8 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 369.4 |  |  | — |  |  | — |  |  | — |  |  | 369.4 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 369.4 |  |  | — |  |  | — |  |  | — |  |  | 369.4 |
Other | — |  |  | 0.1 |  |  | 3.5 |  |  | 0.9 |  |  | — |  |  | 22.6 |  |  | (23.7 | ) |  | 3.4 |
Total revenues | $ | 373.7 |  |  | $ | 208.5 |  |  | $ | 156.1 |  |  | $ | 370.3 |  |  | $ | 305.1 |  |  | $ | 22.6 |  |  | $ | (23.7 | ) |  | $ | 1,412.6 |
| Successor
| Three Months Ended September 30, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 420.9 |  |  | $ | 207.1 |  |  | $ | 147.1 |  |  | $ | — |  |  | $ | 31.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 806.7 |
Export | — |  |  | 0.4 |  |  | 11.2 |  |  | — |  |  | 234.1 |  |  | — |  |  | — |  |  | 245.7 |
Total thermal | 420.9 |  |  | 207.5 |  |  | 158.3 |  |  | — |  |  | 265.7 |  |  | — |  |  | — |  |  | 1,052.4 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 414.1 |  |  | — |  |  | — |  |  | — |  |  | 414.1 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 414.1 |  |  | — |  |  | — |  |  | — |  |  | 414.1 |
Other | — |  |  | 0.2 |  |  | (2.6 | ) |  | 1.8 |  |  | 0.1 |  |  | 19.4 |  |  | (8.2 | ) |  | 10.7 |
Total revenues | $ | 420.9 |  |  | $ | 207.7 |  |  | $ | 155.7 |  |  | $ | 415.9 |  |  | $ | 265.8 |  |  | $ | 19.4 |  |  | $ | (8.2 | ) |  | $ | 1,477.2 |
| Successor
| Nine Months Ended September 30, 2018
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 1,084.4 |  |  | $ | 606.2 |  |  | $ | 410.9 |  |  | $ | — |  |  | $ | 112.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,213.5 |
Export | — |  |  | 1.3 |  |  | 15.4 |  |  | — |  |  | 661.3 |  |  | — |  |  | — |  |  | 678.0 |
Total thermal | 1,084.4 |  |  | 607.5 |  |  | 426.3 |  |  | — |  |  | 773.3 |  |  | — |  |  | — |  |  | 2,891.5 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 1,251.9 |  |  | — |  |  | — |  |  | — |  |  | 1,251.9 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 1,251.9 |  |  | — |  |  | — |  |  | — |  |  | 1,251.9 |
Other | 0.1 |  |  | 0.2 |  |  | 13.1 |  |  | 2.1 |  |  | 0.6 |  |  | 52.7 |  |  | (27.5 | ) |  | 41.3 |
Total revenues | $ | 1,084.5 |  |  | $ | 607.7 |  |  | $ | 439.4 |  |  | $ | 1,254.0 |  |  | $ | 773.9 |  |  | $ | 52.7 |  |  | $ | (27.5 | ) |  | $ | 4,184.7 |
| Successor
| April 2 through September 30, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 782.0 |  |  | $ | 401.9 |  |  | $ | 270.9 |  |  | $ | — |  |  | $ | 59.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,514.5 |
Export | — |  |  | 0.4 |  |  | 11.2 |  |  | — |  |  | 445.0 |  |  | — |  |  | — |  |  | 456.6 |
Total thermal | 782.0 |  |  | 402.3 |  |  | 282.1 |  |  | — |  |  | 504.7 |  |  | — |  |  | — |  |  | 1,971.1 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 701.9 |  |  | — |  |  | — |  |  | — |  |  | 701.9 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 701.9 |  |  | — |  |  | — |  |  | — |  |  | 701.9 |
Other | 4.3 |  |  | 0.3 |  |  | (1.0 | ) |  | 1.8 |  |  | 0.3 |  |  | 24.6 |  |  | 32.2 |  |  | 62.5 |
Total revenues | $ | 786.3 |  |  | $ | 402.6 |  |  | $ | 281.1 |  |  | $ | 703.7 |  |  | $ | 505.0 |  |  | $ | 24.6 |  |  | $ | 32.2 |  |  | $ | 2,735.5 |
| Predecessor
| January 1 through April 1, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 394.3 |  |  | $ | 193.2 |  |  | $ | 133.5 |  |  | $ | — |  |  | $ | 27.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 748.3 |
Export | — |  |  | — |  |  | — |  |  | — |  |  | 197.2 |  |  | — |  |  | — |  |  | 197.2 |
Total thermal | 394.3 |  |  | 193.2 |  |  | 133.5 |  |  | — |  |  | 224.5 |  |  | — |  |  | — |  |  | 945.5 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 324.6 |  |  | — |  |  | — |  |  | — |  |  | 324.6 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 324.6 |  |  | — |  |  | — |  |  | — |  |  | 324.6 |
Other | — |  |  | — |  |  | 16.2 |  |  | 4.3 |  |  | 0.3 |  |  | 15.0 |  |  | 20.3 |  |  | 56.1 |
Total revenues | $ | 394.3 |  |  | $ | 193.2 |  |  | $ | 149.7 |  |  | $ | 328.9 |  |  | $ | 224.8 |  |  | $ | 15.0 |  |  | $ | 20.3 |  |  | $ | 1,326.2 |
Disaggregation of Revenue by Contract Duration [Table Text Block] | Revenue by contract duration was as follows:
| Successor
| Three Months Ended September 30, 2018
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 330.2 |  |  | $ | 205.3 |  |  | $ | 146.6 |  |  | $ | 199.5 |  |  | $ | 235.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,116.9 |
Less than one year | 43.5 |  |  | 3.1 |  |  | 6.0 |  |  | 169.9 |  |  | 69.8 |  |  | — |  |  | — |  |  | 292.3 |
Other (2) | — |  |  | 0.1 |  |  | 3.5 |  |  | 0.9 |  |  | — |  |  | 22.6 |  |  | (23.7 | ) |  | 3.4 |
Total revenues | $ | 373.7 |  |  | $ | 208.5 |  |  | $ | 156.1 |  |  | $ | 370.3 |  |  | $ | 305.1 |  |  | $ | 22.6 |  |  | $ | (23.7 | ) |  | $ | 1,412.6 |
| Successor
| Three Months Ended September 30, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 373.3 |  |  | $ | 199.0 |  |  | $ | 144.2 |  |  | $ | 270.9 |  |  | $ | 164.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,152.1 |
Less than one year | 47.6 |  |  | 8.5 |  |  | 14.1 |  |  | 143.2 |  |  | 101.0 |  |  | — |  |  | — |  |  | 314.4 |
Other (2) | — |  |  | 0.2 |  |  | (2.6 | ) |  | 1.8 |  |  | 0.1 |  |  | 19.4 |  |  | (8.2 | ) |  | 10.7 |
Total revenues | $ | 420.9 |  |  | $ | 207.7 |  |  | $ | 155.7 |  |  | $ | 415.9 |  |  | $ | 265.8 |  |  | $ | 19.4 |  |  | $ | (8.2 | ) |  | $ | 1,477.2 |
| Successor
| Nine Months Ended September 30, 2018
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 984.4 |  |  | $ | 587.0 |  |  | $ | 400.4 |  |  | $ | 852.1 |  |  | $ | 585.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,409.7 |
Less than one year | 100.0 |  |  | 20.5 |  |  | 25.9 |  |  | 399.8 |  |  | 187.5 |  |  | — |  |  | — |  |  | 733.7 |
Other (2) | 0.1 |  |  | 0.2 |  |  | 13.1 |  |  | 2.1 |  |  | 0.6 |  |  | 52.7 |  |  | (27.5 | ) |  | 41.3 |
Total revenues | $ | 1,084.5 |  |  | $ | 607.7 |  |  | $ | 439.4 |  |  | $ | 1,254.0 |  |  | $ | 773.9 |  |  | $ | 52.7 |  |  | $ | (27.5 | ) |  | $ | 4,184.7 |
| Successor
| April 2 through September 30, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 700.0 |  |  | $ | 386.3 |  |  | $ | 266.9 |  |  | $ | 524.3 |  |  | $ | 300.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,177.8 |
Less than one year | 82.0 |  |  | 16.0 |  |  | 15.2 |  |  | 177.6 |  |  | 204.4 |  |  | — |  |  | — |  |  | 495.2 |
Other (2) | 4.3 |  |  | 0.3 |  |  | (1.0 | ) |  | 1.8 |  |  | 0.3 |  |  | 24.6 |  |  | 32.2 |  |  | 62.5 |
Total revenues | $ | 786.3 |  |  | $ | 402.6 |  |  | $ | 281.1 |  |  | $ | 703.7 |  |  | $ | 505.0 |  |  | $ | 24.6 |  |  | $ | 32.2 |  |  | $ | 2,735.5 |
| Predecessor
| January 1 through April 1, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Australian Metallurgical Mining |  | Australian Thermal Mining |  | Trading and Brokerage |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 357.7 |  |  | $ | 193.2 |  |  | $ | 129.3 |  |  | $ | 240.6 |  |  | $ | 134.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,054.9 |
Less than one year | 36.6 |  |  | — |  |  | 4.2 |  |  | 84.0 |  |  | 90.4 |  |  | — |  |  | — |  |  | 215.2 |
Other (2) | — |  |  | — |  |  | 16.2 |  |  | 4.3 |  |  | 0.3 |  |  | 15.0 |  |  | 20.3 |  |  | 56.1 |
Total revenues | $ | 394.3 |  |  | $ | 193.2 |  |  | $ | 149.7 |  |  | $ | 328.9 |  |  | $ | 224.8 |  |  | $ | 15.0 |  |  | $ | 20.3 |  |  | $ | 1,326.2 |
(1) | Corporate and Other revenue includes unrealized gains and losses related to mark-to-market activity from economic hedge activities intended to hedge future coal sales. Such net unrealized losses were $26.8 million and $10.8 million during the three months ended September 30, 2018 and 2017, respectively, and $36.3 million and $1.4 million during the nine months ended September 30, 2018 and the period April 2 through September 30, 2017, respectively. During the period January 1 through April 1, 2017, such net unrealized gains were $16.6 million. When such gains and losses are realized in connection with recognition of the underlying transaction, they are reclassified to realized gains and losses and are then reflected in Trading and Brokerage revenue (realized losses of $11.6 million and $12.3 million during the three months ended September 30, 2018 and 2017, respectively, and $41.1 million, $20.0 million and $11.1 million during the nine months ended September 30, 2018 and the periods April 2 through September 30, 2017 and January 1 through April 1, 2017, respectively). At September 30, 2018 and December 31, 2017, the financial contracts’ fair values resulted in net liabilities, excluding margin, of $75.2 million and $38.9 million, respectively.
(2) | Other includes revenues from arrangements such as customer contract-related payments, royalties related to coal lease agreements, sales agency commissions, farm income and property and facility rentals, for which contract duration is not meaningful.

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