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Revenues (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Revenue Recognition [Abstract] |
Schedule of Accounts Receivable [Table Text Block] | Accounts receivable, net at March 31, 2018 and December 31, 2017 consisted of the following:
| March 31, 2018 |  | December 31, 2017
| (Dollars in millions)
Trade receivables, net | $ | 388.0 |  |  | $ | 504.2 |
Miscellaneous receivables, net | 136.0 |  |  | 47.9 |
Accounts receivable, net | $ | 524.0 |  |  | $ | 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 March 31, 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 |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 389.2 |  |  | $ | 200.9 |  |  | $ | 130.3 |  |  | $ | — |  |  | $ | 36.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 756.5 |
Export | — |  |  | 0.7 |  |  | 8.0 |  |  | — |  |  | 164.9 |  |  | — |  |  | — |  |  | 173.6 |
Total thermal | 389.2 |  |  | 201.6 |  |  | 138.3 |  |  | — |  |  | 201.0 |  |  | — |  |  | — |  |  | 930.1 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 465.3 |  |  | — |  |  | — |  |  | — |  |  | 465.3 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 465.3 |  |  | — |  |  | — |  |  | — |  |  | 465.3 |
Other | 0.1 |  |  | 0.1 |  |  | 5.4 |  |  | 0.9 |  |  | 0.4 |  |  | 20.1 |  |  | 40.3 |  |  | 67.3 |
Total revenues | $ | 389.3 |  |  | $ | 201.7 |  |  | $ | 143.7 |  |  | $ | 466.2 |  |  | $ | 201.4 |  |  | $ | 20.1 |  |  | $ | 40.3 |  |  | $ | 1,462.7 |
| Predecessor
| Three Months Ended March 31, 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 |  | 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 March 31, 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 |  | Consolidated
| (Dollars in millions)
Long-term contracts | $ | 211.8 |  |  | $ | 106.4 |  |  | $ | 117.7 |  |  | $ | 7.6 |  |  | $ | 44.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 488.1 |
Short-term contracts | 131.6 |  |  | 81.2 |  |  | 9.6 |  |  | 389.9 |  |  | 132.7 |  |  | — |  |  | — |  |  | 745.0 |
Spot | 45.8 |  |  | 14.0 |  |  | 11.0 |  |  | 67.8 |  |  | 23.7 |  |  | — |  |  | — |  |  | 162.3 |
Other | 0.1 |  |  | 0.1 |  |  | 5.4 |  |  | 0.9 |  |  | 0.4 |  |  | 20.1 |  |  | 40.3 |  |  | 67.3 |
Total revenues | $ | 389.3 |  |  | $ | 201.7 |  |  | $ | 143.7 |  |  | $ | 466.2 |  |  | $ | 201.4 |  |  | $ | 20.1 |  |  | $ | 40.3 |  |  | $ | 1,462.7 |
| Predecessor
| Three Months Ended March 31, 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 |  | Consolidated
| (Dollars in millions)
Long-term contracts | $ | 238.5 |  |  | $ | 130.0 |  |  | $ | 119.4 |  |  | $ | 4.9 |  |  | $ | 33.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 526.2 |
Short-term contracts | 119.2 |  |  | 63.2 |  |  | 9.9 |  |  | 235.7 |  |  | 100.7 |  |  | — |  |  | — |  |  | 528.7 |
Spot | 36.6 |  |  | — |  |  | 4.2 |  |  | 84.0 |  |  | 90.4 |  |  | — |  |  | — |  |  | 215.2 |
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 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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