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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2025
Revenue Recognition [Abstract] |
Schedule of Accounts Receivable | “Accounts receivable, net” at March 31, 2025 and December 31, 2024 consisted of the following:
| March 31, 2025 |  | December 31, 2024
| (Dollars in millions)
Trade receivables, net | $ | 220.4 |  |  | $ | 294.9 |
Miscellaneous receivables, net | 57.3 |  |  | 64.4 |
Accounts receivable, net | $ | 277.7 |  |  | $ | 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 March 31, 2025
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 37.7 |  |  | $ | — |  |  | $ | 275.5 |  |  | $ | 168.7 |  |  | $ | — |  |  | $ | 481.9 |
Export | 227.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 227.3 |
Total thermal | 265.0 |  |  | — |  |  | 275.5 |  |  | 168.7 |  |  | — |  |  | 709.2 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 219.7 |  |  | — |  |  | — |  |  | — |  |  | 219.7 |
Total metallurgical | — |  |  | 219.7 |  |  | — |  |  | — |  |  | — |  |  | 219.7 |
Other | 0.1 |  |  | 0.4 |  |  | 0.1 |  |  | — |  |  | 7.5 |  |  | 8.1 |
Revenue | $ | 265.1 |  |  | $ | 220.1 |  |  | $ | 275.6 |  |  | $ | 168.7 |  |  | $ | 7.5 |  |  | $ | 937.0 |
| Three Months Ended March 31, 2024
| Seaborne Thermal |  | Seaborne Metallurgical |  | Powder River Basin |  | Other U.S. Thermal |  | Corporate and Other (1) |  | Consolidated
| (Dollars in millions)
Thermal coal |  |  |  |  |  |  |  |  |  |  |
Domestic | $ | 40.6 |  |  | $ | — |  |  | $ | 254.1 |  |  | $ | 178.0 |  |  | $ | — |  |  | $ | 472.7 |
Export | 243.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 243.1 |
Total thermal | 283.7 |  |  | — |  |  | 254.1 |  |  | 178.0 |  |  | — |  |  | 715.8 |
Metallurgical coal |  |  |  |  |  |  |  |  |  |  |
Export | — |  |  | 244.0 |  |  | — |  |  | — |  |  | — |  |  | 244.0 |
Total metallurgical | — |  |  | 244.0 |  |  | — |  |  | — |  |  | — |  |  | 244.0 |
Other | 0.2 |  |  | 3.0 |  |  | — |  |  | 13.6 |  |  | 7.0 |  |  | 23.8 |
Revenue | $ | 283.9 |  |  | $ | 247.0 |  |  | $ | 254.1 |  |  | $ | 191.6 |  |  | $ | 7.0 |  |  | $ | 983.6 |
(1) Corporate and Other includes the following:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2025 |  | 2024
|  |  |  |  | (Dollars in millions)
Revenue from physical sale of coal (2) |  |  |  |  | $ | 4.0 |  |  | $ | 2.1 |
Other |  |  |  |  | 3.5 |  |  | 4.9 |
Total Corporate and Other |  |  |  |  | $ | 7.5 |  |  | $ | 7.0 |
(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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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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