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Revenue Recognition (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 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 | $ | 34.8 |  |  | $ | — |  |  | $ | 333.6 |  |  | $ | 175.8 |  |  | $ | 143.6 |  |  | $ | — |  |  | $ | 687.8 |
Export | 214.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 214.6 |
Total thermal | 249.4 |  |  | — |  |  | 333.6 |  |  | 175.8 |  |  | 143.6 |  |  | — |  |  | 902.4 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 215.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 215.4 |
Total metallurgical | — |  |  | 215.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 215.4 |
Other | 0.1 |  |  | 0.9 |  |  | — |  |  | 0.2 |  |  | 6.8 |  |  | (19.4 | ) |  | (11.4 | )
Revenues | $ | 249.5 |  |  | $ | 216.3 |  |  | $ | 333.6 |  |  | $ | 176.0 |  |  | $ | 150.4 |  |  | $ | (19.4 | ) |  | $ | 1,106.4 |
| Three Months Ended September 30, 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 | $ | 37.4 |  |  | $ | — |  |  | $ | 373.7 |  |  | $ | 208.4 |  |  | $ | 149.5 |  |  | $ | — |  |  | $ | 769.0 |
Export | 267.7 |  |  | — |  |  | — |  |  | — |  |  | 3.1 |  |  | — |  |  | 270.8 |
Total thermal | 305.1 |  |  | — |  |  | 373.7 |  |  | 208.4 |  |  | 152.6 |  |  | — |  |  | 1,039.8 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 369.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 369.4 |
Total metallurgical | — |  |  | 369.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 369.4 |
Other | — |  |  | 0.9 |  |  | — |  |  | 0.1 |  |  | 3.5 |  |  | (1.1 | ) |  | 3.4 |
Revenues | $ | 305.1 |  |  | $ | 370.3 |  |  | $ | 373.7 |  |  | $ | 208.5 |  |  | $ | 156.1 |  |  | $ | (1.1 | ) |  | $ | 1,412.6 |
| Nine Months Ended September 30, 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 | $ | 110.9 |  |  | $ | — |  |  | $ | 903.4 |  |  | $ | 522.3 |  |  | $ | 417.0 |  |  | $ | — |  |  | $ | 1,953.6 |
Export | 608.7 |  |  | — |  |  | — |  |  | — |  |  | 11.3 |  |  | — |  |  | 620.0 |
Total thermal | 719.6 |  |  | — |  |  | 903.4 |  |  | 522.3 |  |  | 428.3 |  |  | — |  |  | 2,573.6 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 829.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 829.4 |
Total metallurgical | — |  |  | 829.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 829.4 |
Other | 1.1 |  |  | 2.3 |  |  | 0.1 |  |  | 0.3 |  |  | 19.9 |  |  | 79.3 |  |  | 103.0 |
Revenues | $ | 720.7 |  |  | $ | 831.7 |  |  | $ | 903.5 |  |  | $ | 522.6 |  |  | $ | 448.2 |  |  | $ | 79.3 |  |  | $ | 3,506.0 |
| Nine Months Ended September 30, 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 | $ | 112.0 |  |  | $ | — |  |  | $ | 1,084.4 |  |  | $ | 606.2 |  |  | $ | 410.9 |  |  | $ | — |  |  | $ | 2,213.5 |
Export | 661.3 |  |  | — |  |  | — |  |  | 1.3 |  |  | 15.4 |  |  | — |  |  | 678.0 |
Total thermal | 773.3 |  |  | — |  |  | 1,084.4 |  |  | 607.5 |  |  | 426.3 |  |  | — |  |  | 2,891.5 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 1,251.9 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,251.9 |
Total metallurgical | — |  |  | 1,251.9 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,251.9 |
Other | 0.6 |  |  | 2.1 |  |  | 0.1 |  |  | 0.2 |  |  | 13.1 |  |  | 25.2 |  |  | 41.3 |
Revenues | $ | 773.9 |  |  | $ | 1,254.0 |  |  | $ | 1,084.5 |  |  | $ | 607.7 |  |  | $ | 439.4 |  |  | $ | 25.2 |  |  | $ | 4,184.7 |
Disaggregation of Revenue by Contract Duration [Table Text Block] | Revenue by initial contract duration was as follows:
| Three Months Ended September 30, 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 | $ | 158.5 |  |  | $ | 193.3 |  |  | $ | 287.8 |  |  | $ | 171.6 |  |  | $ | 143.6 |  |  | $ | — |  |  | $ | 954.8 |
Less than one year | 90.9 |  |  | 22.1 |  |  | 45.8 |  |  | 4.2 |  |  | — |  |  | — |  |  | 163.0 |
Other (2) | 0.1 |  |  | 0.9 |  |  | — |  |  | 0.2 |  |  | 6.8 |  |  | (19.4 | ) |  | (11.4 | )
Revenues | $ | 249.5 |  |  | $ | 216.3 |  |  | $ | 333.6 |  |  | $ | 176.0 |  |  | $ | 150.4 |  |  | $ | (19.4 | ) |  | $ | 1,106.4 |
| Three Months Ended September 30, 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 | $ | 235.3 |  |  | $ | 199.5 |  |  | $ | 330.2 |  |  | $ | 205.3 |  |  | $ | 146.6 |  |  | $ | — |  |  | $ | 1,116.9 |
Less than one year | 69.8 |  |  | 169.9 |  |  | 43.5 |  |  | 3.1 |  |  | 6.0 |  |  | — |  |  | 292.3 |
Other (2) | — |  |  | 0.9 |  |  | — |  |  | 0.1 |  |  | 3.5 |  |  | (1.1 | ) |  | 3.4 |
Revenues | $ | 305.1 |  |  | $ | 370.3 |  |  | $ | 373.7 |  |  | $ | 208.5 |  |  | $ | 156.1 |  |  | $ | (1.1 | ) |  | $ | 1,412.6 |
| Nine Months Ended September 30, 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 | $ | 480.2 |  |  | $ | 668.8 |  |  | $ | 837.6 |  |  | $ | 497.6 |  |  | $ | 422.2 |  |  | $ | — |  |  | $ | 2,906.4 |
Less than one year | 239.4 |  |  | 160.6 |  |  | 65.8 |  |  | 24.7 |  |  | 6.1 |  |  | — |  |  | 496.6 |
Other (2) | 1.1 |  |  | 2.3 |  |  | 0.1 |  |  | 0.3 |  |  | 19.9 |  |  | 79.3 |  |  | 103.0 |
Revenues | $ | 720.7 |  |  | $ | 831.7 |  |  | $ | 903.5 |  |  | $ | 522.6 |  |  | $ | 448.2 |  |  | $ | 79.3 |  |  | $ | 3,506.0 |
| Nine Months Ended September 30, 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 | $ | 585.8 |  |  | $ | 852.1 |  |  | $ | 984.4 |  |  | $ | 587.0 |  |  | $ | 400.4 |  |  | $ | — |  |  | $ | 3,409.7 |
Less than one year | 187.5 |  |  | 399.8 |  |  | 100.0 |  |  | 20.5 |  |  | 25.9 |  |  | — |  |  | 733.7 |
Other (2) | 0.6 |  |  | 2.1 |  |  | 0.1 |  |  | 0.2 |  |  | 13.1 |  |  | 25.2 |  |  | 41.3 |
Revenues | $ | 773.9 |  |  | $ | 1,254.0 |  |  | $ | 1,084.5 |  |  | $ | 607.7 |  |  | $ | 439.4 |  |  | $ | 25.2 |  |  | $ | 4,184.7 |
(1) | Corporate and Other revenue includes gains and losses related to mark-to-market adjustments 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 September 30, 2019 and December 31, 2018 consisted of the following:
| September 30, 2019 |  | December 31, 2018
| (Dollars in millions)
Trade receivables, net | $ | 257.1 |  |  | $ | 345.5 |
Miscellaneous receivables, net | 36.3 |  |  | 104.9 |
Accounts receivable, net | $ | 293.4 |  |  | $ | 450.4 |

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