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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2025
Revenue Recognition [Abstract] |
Schedule of Accounts Receivable | “Accounts receivable, net” at June 30, 2025 and December 31, 2024 consisted of the following:
| June 30, 2025 |  | December 31, 2024
| (Dollars in millions)
Trade receivables, net | $ | 264.3 |  |  | $ | 294.9 |
Miscellaneous receivables, net | 58.4 |  |  | 64.4 |
Accounts receivable, net | $ | 322.7 |  |  | $ | 359.3 |
Disaggregation of Revenue | 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.
| Three Months Ended June 30, 2025
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 35.8 |  |  | $ | — |  |  | $ | 275.7 |  |  | $ | 155.0 |  |  | $ | — |  |  | $ | 466.5 |
Export | 159.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 159.3 |
Total thermal | 195.1 |  |  | — |  |  | 275.7 |  |  | 155.0 |  |  | — |  |  | 625.8 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 251.9 |  |  | — |  |  | — |  |  | — |  |  | 251.9 |
Total metallurgical | — |  |  | 251.9 |  |  | — |  |  | — |  |  | — |  |  | 251.9 |
Other | — |  |  | 0.3 |  |  | — |  |  | 0.1 |  |  | 12.0 |  |  | 12.4 |
Revenue | $ | 195.1 |  |  | $ | 252.2 |  |  | $ | 275.7 |  |  | $ | 155.1 |  |  | $ | 12.0 |  |  | $ | 890.1 |
| Three Months Ended June 30, 2024
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 36.9 |  |  | $ | — |  |  | $ | 221.4 |  |  | $ | 200.3 |  |  | $ | — |  |  | $ | 458.6 |
Export | 270.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 270.6 |
Total thermal | 307.5 |  |  | — |  |  | 221.4 |  |  | 200.3 |  |  | — |  |  | 729.2 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 294.0 |  |  | — |  |  | — |  |  | — |  |  | 294.0 |
Total metallurgical | — |  |  | 294.0 |  |  | — |  |  | — |  |  | — |  |  | 294.0 |
Other | — |  |  | 0.3 |  |  | 0.5 |  |  | 1.7 |  |  | 16.3 |  |  | 18.8 |
Revenue | $ | 307.5 |  |  | $ | 294.3 |  |  | $ | 221.9 |  |  | $ | 202.0 |  |  | $ | 16.3 |  |  | $ | 1,042.0 |
| Six Months Ended June 30, 2025
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 73.5 |  |  | $ | — |  |  | $ | 551.2 |  |  | $ | 323.7 |  |  | $ | — |  |  | $ | 948.4 |
Export | 386.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 386.6 |
Total thermal | 460.1 |  |  | — |  |  | 551.2 |  |  | 323.7 |  |  | — |  |  | 1,335.0 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 471.6 |  |  | — |  |  | — |  |  | — |  |  | 471.6 |
Total metallurgical | — |  |  | 471.6 |  |  | — |  |  | — |  |  | — |  |  | 471.6 |
Other | 0.1 |  |  | 0.7 |  |  | 0.1 |  |  | 0.1 |  |  | 19.5 |  |  | 20.5 |
Revenue | $ | 460.2 |  |  | $ | 472.3 |  |  | $ | 551.3 |  |  | $ | 323.8 |  |  | $ | 19.5 |  |  | $ | 1,827.1 |
| Six Months Ended June 30, 2024 |  |  |  |
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated |  |  |  |
| (Dollars in millions) |  |  |  |
Thermal coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 77.5 |  |  | $ | — |  |  | $ | 475.5 |  |  | $ | 378.3 |  |  | $ | — |  |  | $ | 931.3 |  |  |  |  |
Export | 513.7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 513.7 |  |  |  |  |
Total thermal | 591.2 |  |  | — |  |  | 475.5 |  |  | 378.3 |  |  | — |  |  | 1,445.0 |  |  |  |  |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 538.0 |  |  | — |  |  | — |  |  | — |  |  | 538.0 |  |  |  |  |
Total metallurgical | — |  |  | 538.0 |  |  | — |  |  | — |  |  | — |  |  | 538.0 |  |  |  |  |
Other | 0.2 |  |  | 3.3 |  |  | 0.5 |  |  | 15.3 |  |  | 23.3 |  |  | 42.6 |  |  |  |  |
Revenue | $ | 591.4 |  |  | $ | 541.3 |  |  | $ | 476.0 |  |  | $ | 393.6 |  |  | $ | 23.3 |  |  | $ | 2,025.6 |  |  |  |  |
(1) Corporate and Other includes the following:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
| (Dollars in millions)
Revenue from physical sale of coal (2) | $ | 7.8 |  |  | $ | 12.1 |  |  | $ | 11.8 |  |  | $ | 14.2 |
Other | 4.2 |  |  | 4.2 |  |  | 7.7 |  |  | 9.1 |
Total Corporate and Other | $ | 12.0 |  |  | $ | 16.3 |  |  | $ | 19.5 |  |  | $ | 23.3 |
(2) Includes revenue recognized upon the physical sale of coal purchased from the Company’s operating segments and sold to customers through the Company’s coal trading business. Primarily represents the difference between the price contracted with the customer and the price allocated to the operating segment.

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