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Revenues | 12 Months Ended
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Dec. 31, 2018
Revenue Recognition [Abstract] |
Revenue from Contract with Customer [Text Block] | Revenue Recognition The Company accounts for revenue in accordance with ASC Topic 606, “Revenue from Contracts with Customers,” (ASC 606) which the Company adopted on January 1, 2018, using the modified retrospective approach. See Note 1. “Summary of Significant Accounting Policies,” for further discussion of the adoption, including the transition impact on the Company’s accompanying consolidated balance sheets. Disaggregation of Revenues Revenue by product type and market is set forth in the following tables. With respect to its seaborne 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
| Year Ended December 31, 2018
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 1,424.8 |  |  | $ | 799.4 |  |  | $ | 543.1 |  |  | $ | — |  |  | $ | 153.0 |  |  | $ | — |  |  | $ | 2,920.3 |
Export | — |  |  | 1.3 |  |  | 22.1 |  |  | — |  |  | 945.0 |  |  | — |  |  | 968.4 |
Total thermal | 1,424.8 |  |  | 800.7 |  |  | 565.2 |  |  | — |  |  | 1,098.0 |  |  | — |  |  | 3,888.7 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 1,548.6 |  |  | — |  |  | — |  |  | 1,548.6 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 1,548.6 |  |  | — |  |  | — |  |  | 1,548.6 |
Other | — |  |  | 0.3 |  |  | 26.8 |  |  | 4.4 |  |  | 1.2 |  |  | 111.8 |  |  | 144.5 |
Total revenues | $ | 1,424.8 |  |  | $ | 801.0 |  |  | $ | 592.0 |  |  | $ | 1,553.0 |  |  | $ | 1,099.2 |  |  | $ | 111.8 |  |  | $ | 5,581.8 |
| Successor
| April 2 through December 31, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 1,174.3 |  |  | $ | 586.7 |  |  | $ | 409.8 |  |  | $ | — |  |  | $ | 87.9 |  |  | $ | — |  |  | $ | 2,258.7 |
Export | — |  |  | 5.3 |  |  | 19.2 |  |  | — |  |  | 684.1 |  |  | — |  |  | 708.6 |
Total thermal | 1,174.3 |  |  | 592.0 |  |  | 429.0 |  |  | — |  |  | 772.0 |  |  | — |  |  | 2,967.3 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 1,221.0 |  |  | — |  |  | — |  |  | 1,221.0 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 1,221.0 |  |  | — |  |  | — |  |  | 1,221.0 |
Other | 4.4 |  |  | 0.3 |  |  | 11.7 |  |  | — |  |  | 0.5 |  |  | 47.4 |  |  | 64.3 |
Total revenues | $ | 1,178.7 |  |  | $ | 592.3 |  |  | $ | 440.7 |  |  | $ | 1,221.0 |  |  | $ | 772.5 |  |  | $ | 47.4 |  |  | $ | 4,252.6 |
| Predecessor
| January 1 through April 1, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | 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 |  |  | 35.3 |  |  | 56.1 |
Total revenues | $ | 394.3 |  |  | $ | 193.2 |  |  | $ | 149.7 |  |  | $ | 328.9 |  |  | $ | 224.8 |  |  | $ | 35.3 |  |  | $ | 1,326.2 |
| Predecessor
| Year Ended December 31, 2016
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 1,472.5 |  |  | $ | 793.4 |  |  | $ | 516.1 |  |  | $ | — |  |  | $ | 108.1 |  |  | $ | — |  |  | $ | 2,890.1 |
Export | — |  |  | — |  |  | — |  |  | — |  |  | 715.3 |  |  | — |  |  | 715.3 |
Total thermal | 1,472.5 |  |  | 793.4 |  |  | 516.1 |  |  | — |  |  | 823.4 |  |  | — |  |  | 3,605.4 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | — |  |  | — |  |  | 1,089.6 |  |  | — |  |  | — |  |  | 1,089.6 |
Total metallurgical | — |  |  | — |  |  | — |  |  | 1,089.6 |  |  | — |  |  | — |  |  | 1,089.6 |
Other | 0.8 |  |  | (0.9 | ) |  | 9.9 |  |  | 0.8 |  |  | 1.5 |  |  | 8.2 |  |  | 20.3 |
Total revenues | $ | 1,473.3 |  |  | $ | 792.5 |  |  | $ | 526.0 |  |  | $ | 1,090.4 |  |  | $ | 824.9 |  |  | $ | 8.2 |  |  | $ | 4,715.3 |
Revenue by contract duration was as follows:
| Successor
| Year Ended December 31, 2018
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 1,283.9 |  |  | $ | 775.4 |  |  | $ | 531.8 |  |  | $ | 1,036.7 |  |  | $ | 799.5 |  |  | $ | — |  |  | $ | 4,427.3 |
Less than one year | 140.9 |  |  | 25.3 |  |  | 33.4 |  |  | 511.9 |  |  | 298.5 |  |  | — |  |  | 1,010.0 |
Other (2) | — |  |  | 0.3 |  |  | 26.8 |  |  | 4.4 |  |  | 1.2 |  |  | 111.8 |  |  | 144.5 |
Total revenues | $ | 1,424.8 |  |  | $ | 801.0 |  |  | $ | 592.0 |  |  | $ | 1,553.0 |  |  | $ | 1,099.2 |  |  | $ | 111.8 |  |  | $ | 5,581.8 |
| Successor
| April 2 through December 31, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 1,023.1 |  |  | $ | 560.5 |  |  | $ | 404.6 |  |  | $ | 867.1 |  |  | $ | 503.0 |  |  | $ | — |  |  | $ | 3,358.3 |
Less than one year | 151.2 |  |  | 31.5 |  |  | 24.4 |  |  | 353.9 |  |  | 269.0 |  |  | — |  |  | 830.0 |
Other (2) | 4.4 |  |  | 0.3 |  |  | 11.7 |  |  | — |  |  | 0.5 |  |  | 47.4 |  |  | 64.3 |
Total revenues | $ | 1,178.7 |  |  | $ | 592.3 |  |  | $ | 440.7 |  |  | $ | 1,221.0 |  |  | $ | 772.5 |  |  | $ | 47.4 |  |  | $ | 4,252.6 |
| Predecessor
| January 1 through April 1, 2017
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | 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 |  |  | 35.3 |  |  | 56.1 |
Total revenues | $ | 394.3 |  |  | $ | 193.2 |  |  | $ | 149.7 |  |  | $ | 328.9 |  |  | $ | 224.8 |  |  | $ | 35.3 |  |  | $ | 1,326.2 |
| Predecessor
| Year Ended December 31, 2016
| Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Seaborne Metallurgical Mining |  | Seaborne Thermal Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 1,364.0 |  |  | $ | 791.8 |  |  | $ | 478.8 |  |  | $ | 686.1 |  |  | $ | 464.2 |  |  | $ | — |  |  | $ | 3,784.9 |
Less than one year | 108.5 |  |  | 1.6 |  |  | 37.3 |  |  | 403.5 |  |  | 359.2 |  |  | — |  |  | 910.1 |
Other (2) | 0.8 |  |  | (0.9 | ) |  | 9.9 |  |  | 0.8 |  |  | 1.5 |  |  | 8.2 |  |  | 20.3 |
Total revenues | $ | 1,473.3 |  |  | $ | 792.5 |  |  | $ | 526.0 |  |  | $ | 1,090.4 |  |  | $ | 824.9 |  |  | $ | 8.2 |  |  | $ | 4,715.3 |
(1) | Corporate and Other revenue includes realized and unrealized gains and losses related to mark-to-market activity from economic hedge activities intended to hedge future coal sales. Refer to Note 9. “Derivatives and Fair Value Measurements” for additional information regarding the economic hedge activities.
(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.
Committed Revenue from Contracts with Customers The Company expects to recognize revenue subsequent to December 31, 2018 of approximately $5.8 billion related to contracts with customers in which volumes and prices per ton were fixed or reasonably estimable at December 31, 2018. Approximately 51% of such amount is expected to be recognized over the next twelve months and the remainder thereafter. Actual revenue related to such contracts may differ materially for various reasons, including price adjustment features for coal quality and cost escalations, volume optionality provisions and potential force majeure events. This estimate of future revenue does not include any revenue related to contracts with variable prices per ton that cannot be reasonably estimated, such as the majority of seaborne metallurgical and seaborne thermal coal contracts where pricing is negotiated or settled quarterly or annually. Accounts Receivable “Accounts receivable, net” at December 31, 2018 and 2017 consisted of the following:
| December 31, 2018 |  | December 31, 2017
| (Dollars in millions)
Trade receivables, net | $ | 345.5 |  |  | $ | 504.2 |
Miscellaneous receivables, net | 104.9 |  |  | 47.9 |
Accounts receivable, net | $ | 450.4 |  |  | $ | 552.1 |
Trade receivables, net presented above have been shown net of reserves of $0.1 million and $0.3 million as of December 31, 2018 and 2017, respectively. Miscellaneous receivables, net presented above have been shown net of reserves of $4.3 million as of both December 31, 2018 and 2017. Included in “Operating costs and expenses” in the consolidated statements of operations was a credit of $0.2 million for the year ended December 31, 2018, and charges of $4.3 million and $0.8 million for the period April 2 through December 31, 2017 and the year ended December 31, 2016, respectively. No charges for doubtful accounts were recognized during the period January 1 through April 1, 2017. The Company also records long-term customer receivables related to the reimbursement of certain post-mining costs which are included within “Investments and other assets” in the accompanying consolidated balance sheets. The balance of such receivables was $11.1 million and $139.3 million as of December 31, 2018 and 2017, respectively. The balance was adjusted in connection with the adoption of ASC 606, as described in Note 1. “Summary of Significant Accounting Policies.” Also in connection with the adoption of ASC 606, the Company prospectively records a portion of the consideration received as “Interest income” rather than “Revenues” in the accompanying consolidated statements of operations, due to the embedded financing element within the related contract. Interest income related to these arrangements amounted to $8.4 million during the year ended December 31, 2018.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 + Details
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