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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2025
Revenue Recognition [Abstract] |
Disaggregation of Revenues | Revenue by product type and market is set forth in the following tables. With respect to its seaborne reportable 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.
| Year Ended December 31, 2025
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 136.0 |  |  | $ | — |  |  | $ | 1,153.0 |  |  | $ | 707.5 |  |  | $ | — |  |  | $ | 1,996.5 |
Export | 771.8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 771.8 |
Total thermal | 907.8 |  |  | — |  |  | 1,153.0 |  |  | 707.5 |  |  | — |  |  | 2,768.3 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 1,034.8 |  |  | — |  |  | — |  |  | — |  |  | 1,034.8 |
Total metallurgical | — |  |  | 1,034.8 |  |  | — |  |  | — |  |  | — |  |  | 1,034.8 |
Other | 0.7 |  |  | 1.8 |  |  | — |  |  | (0.2) |  |  | 56.1 |  |  | 58.4 |
Revenue | $ | 908.5 |  |  | $ | 1,036.6 |  |  | $ | 1,153.0 |  |  | $ | 707.3 |  |  | $ | 56.1 |  |  | $ | 3,861.5 |
| Year Ended December 31, 2024
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 150.8 |  |  | $ | — |  |  | $ | 1,096.4 |  |  | $ | 785.0 |  |  | $ | — |  |  | $ | 2,032.2 |
Export | 1,060.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,060.6 |
Total thermal | 1,211.4 |  |  | — |  |  | 1,096.4 |  |  | 785.0 |  |  | — |  |  | 3,092.8 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 1,049.5 |  |  | — |  |  | — |  |  | — |  |  | 1,049.5 |
Total metallurgical | — |  |  | 1,049.5 |  |  | — |  |  | — |  |  | — |  |  | 1,049.5 |
Other | 2.5 |  |  | 6.1 |  |  | 2.4 |  |  | 37.6 |  |  | 45.8 |  |  | 94.4 |
Revenue | $ | 1,213.9 |  |  | $ | 1,055.6 |  |  | $ | 1,098.8 |  |  | $ | 822.6 |  |  | $ | 45.8 |  |  | $ | 4,236.7 |
| Year Ended December 31, 2023
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 136.4 |  |  | $ | — |  |  | $ | 1,193.9 |  |  | $ | 867.7 |  |  | $ | — |  |  | $ | 2,198.0 |
Export | 1,192.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1,192.5 |
Total thermal | 1,328.9 |  |  | — |  |  | 1,193.9 |  |  | 867.7 |  |  | — |  |  | 3,390.5 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 1,299.6 |  |  | — |  |  | — |  |  | — |  |  | 1,299.6 |
Total metallurgical | — |  |  | 1,299.6 |  |  | — |  |  | — |  |  | — |  |  | 1,299.6 |
Other | 0.8 |  |  | 2.3 |  |  | 4.2 |  |  | 20.5 |  |  | 228.8 |  |  | 256.6 |
Revenue | $ | 1,329.7 |  |  | $ | 1,301.9 |  |  | $ | 1,198.1 |  |  | $ | 888.2 |  |  | $ | 228.8 |  |  | $ | 4,946.7 |
Disaggregation of Revenue by Contract | (1) Corporate and Other includes the following:
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
| (Dollars in millions)
Unrealized gains on derivative contracts related to forecasted sales | $ | — |  |  | $ | — |  |  | $ | 159.0 |
Realized losses on derivative contracts related to forecasted sales | — |  |  | — |  |  | (80.9) |
Revenue from physical sale of coal (2) | 35.4 |  |  | 27.8 |  |  | 109.4 |
Other | 20.7 |  |  | 18.0 |  |  | 41.3 |
Total Corporate and Other | $ | 56.1 |  |  | $ | 45.8 |  |  | $ | 228.8 |
(2) Includes revenue recognized upon the physical sale of coal purchased from the Company’s reportable segments and sold to customers through the Company’s coal trading business, including as part of settling certain derivative contracts. Primarily represents the difference between the price contracted with the customer and the price allocated to the reportable segment.
Schedule of Accounts Receivable | “Accounts receivable, net” at December 31, 2025 and 2024 consisted of the following:
| December 31,
| 2025 |  | 2024
| (Dollars in millions)
Trade receivables, net | $ | 267.0 |  |  | $ | 294.9 |
Miscellaneous receivables, net | 47.9 |  |  | 64.4 |
Accounts receivable, net | $ | 314.9 |  |  | $ | 359.3 |

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