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Revenues (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue Recognition [Abstract] |
Disaggregation of Revenue by Product Type and Market [Table Text Block] | 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.
| Three Months Ended March 31, 2019
| Seaborne Thermal Mining |  | Seaborne Metallurgical Mining |  | Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 38.4 |  |  | $ | — |  |  | $ | 287.3 |  |  | $ | 179.0 |  |  | $ | 142.7 |  |  | $ | — |  |  | $ | 647.4 |
Export | 211.9 |  |  | — |  |  | — |  |  | — |  |  | 7.0 |  |  | — |  |  | 218.9 |
Total thermal | 250.3 |  |  | — |  |  | 287.3 |  |  | 179.0 |  |  | 149.7 |  |  | — |  |  | 866.3 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 323.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 323.7 |
Total metallurgical | — |  |  | 323.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 323.7 |
Other | 0.7 |  |  | 0.8 |  |  | — |  |  | 0.1 |  |  | 6.0 |  |  | 53.0 |  |  | 60.6 |
Revenues | $ | 251.0 |  |  | $ | 324.5 |  |  | $ | 287.3 |  |  | $ | 179.1 |  |  | $ | 155.7 |  |  | $ | 53.0 |  |  | $ | 1,250.6 |
| Three Months Ended March 31, 2018
| Seaborne Thermal Mining |  | Seaborne Metallurgical Mining |  | Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 36.1 |  |  | $ | — |  |  | $ | 389.2 |  |  | $ | 200.9 |  |  | $ | 130.3 |  |  | $ | — |  |  | $ | 756.5 |
Export | 164.9 |  |  | — |  |  | — |  |  | 0.7 |  |  | 8.0 |  |  | — |  |  | 173.6 |
Total thermal | 201.0 |  |  | — |  |  | 389.2 |  |  | 201.6 |  |  | 138.3 |  |  | — |  |  | 930.1 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 465.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 465.3 |
Total metallurgical | — |  |  | 465.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 465.3 |
Other | 0.4 |  |  | 0.9 |  |  | 0.1 |  |  | 0.1 |  |  | 5.4 |  |  | 60.4 |  |  | 67.3 |
Revenues | $ | 201.4 |  |  | $ | 466.2 |  |  | $ | 389.3 |  |  | $ | 201.7 |  |  | $ | 143.7 |  |  | $ | 60.4 |  |  | $ | 1,462.7 |
Disaggregation of Revenue by Contract Duration [Table Text Block] | Revenue by contract duration was as follows:
| Three Months Ended March 31, 2019
| Seaborne Thermal Mining |  | Seaborne Metallurgical Mining |  | Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 171.1 |  |  | $ | 232.8 |  |  | $ | 280.1 |  |  | $ | 167.8 |  |  | $ | 146.0 |  |  | $ | — |  |  | $ | 997.8 |
Less than one year | 79.2 |  |  | 90.9 |  |  | 7.2 |  |  | 11.2 |  |  | 3.7 |  |  | — |  |  | 192.2 |
Other (2) | 0.7 |  |  | 0.8 |  |  | — |  |  | 0.1 |  |  | 6.0 |  |  | 53.0 |  |  | 60.6 |
Revenues | $ | 251.0 |  |  | $ | 324.5 |  |  | $ | 287.3 |  |  | $ | 179.1 |  |  | $ | 155.7 |  |  | $ | 53.0 |  |  | $ | 1,250.6 |
| Three Months Ended March 31, 2018
| Seaborne Thermal Mining |  | Seaborne Metallurgical Mining |  | Powder River Basin Mining |  | Midwestern U.S. Mining |  | Western U.S. Mining |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
One year or longer | $ | 177.3 |  |  | $ | 397.5 |  |  | $ | 343.4 |  |  | $ | 187.6 |  |  | $ | 127.3 |  |  | $ | — |  |  | $ | 1,233.1 |
Less than one year | 23.7 |  |  | 67.8 |  |  | 45.8 |  |  | 14.0 |  |  | 11.0 |  |  | — |  |  | 162.3 |
Other (2) | 0.4 |  |  | 0.9 |  |  | 0.1 |  |  | 0.1 |  |  | 5.4 |  |  | 60.4 |  |  | 67.3 |
Revenues | $ | 201.4 |  |  | $ | 466.2 |  |  | $ | 389.3 |  |  | $ | 201.7 |  |  | $ | 143.7 |  |  | $ | 60.4 |  |  | $ | 1,462.7 |
(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 8. “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.
Schedule of Accounts Receivable [Table Text Block] | “Accounts receivable, net” at March 31, 2019 and December 31, 2018 consisted of the following:
| March 31, 2019 |  | December 31, 2018
| (Dollars in millions)
Trade receivables, net | $ | 366.6 |  |  | $ | 345.5 |
Miscellaneous receivables, net | 188.0 |  |  | 104.9 |
Accounts receivable, net | $ | 554.6 |  |  | $ | 450.4 |

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