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Segment and Geographic Information - Segment Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Revenue from physical sale of coal | $ 4,236.7 | $ 4,946.7 | $ 4,981.9
Adjusted EBITDA | 871.7 | 1,363.9 | 1,844.7
Segment, Expenditure, Addition to Long-Lived Assets | 401.3 | 348.3 | 221.5
Income from equity affiliates | (11.5) | (6.9) | (131.2)
Shoal Creek insurance recovery | 109.5 | 0.0 | 0.0
Seaborne Thermal |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from physical sale of coal | 1,213.9 | 1,329.7 | 1,345.6
Labor costs | 157.2 | 148.8 | 143.2
Repair costs | 152.8 | 154.4 | 109.3
Outside services | 128.7 | 122.7 | 116.5
Commodities expense | 88.6 | 97.0 | 97.7
Sales related costs | 224.3 | 207.4 | 206.0
Other expenses | 32.3 | 22.6 | 25.3
Adjusted EBITDA | 430.0 | 576.8 | 647.6
Segment, Expenditure, Addition to Long-Lived Assets | 73.2 | 62.0 | 38.8
Income from equity affiliates | 0.0 | 0.0 | 0.0
Seaborne Metallurgical |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from physical sale of coal | 1,055.6 | 1,301.9 | 1,616.9
Labor costs | 212.7 | 187.2 | 183.8
Repair costs | 190.8 | 151.3 | 134.1
Outside services | 258.9 | 205.1 | 167.3
Commodities expense | 59.6 | 61.5 | 72.2
Sales related costs | 231.6 | 259.0 | 286.0
Other expenses | (140.5) | (0.3) | (8.2)
Adjusted EBITDA | 242.5 | 438.1 | 781.7
Segment, Expenditure, Addition to Long-Lived Assets | 266.6 | 186.4 | 84.8
Income from equity affiliates | 0.0 | 0.0 | 0.0
Shoal Creek insurance recovery | 80.8 |  |
Powder River Basin |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from physical sale of coal | 1,098.8 | 1,198.1 | 1,065.5
Labor costs | 206.8 | 201.1 | 192.1
Repair costs | 131.7 | 154.9 | 148.0
Outside services | 123.2 | 138.0 | 147.6
Commodities expense | 158.5 | 180.2 | 214.1
Sales related costs | 297.5 | 341.9 | 286.0
Other expenses | 42.5 | 28.3 | 9.5
Adjusted EBITDA | 138.6 | 153.7 | 68.2
Segment, Expenditure, Addition to Long-Lived Assets | 35.0 | 40.9 | 59.1
Income from equity affiliates | 0.0 | 0.0 | 0.0
Other U.S. Thermal |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from physical sale of coal | 822.6 | 888.2 | 952.2
Labor costs | 218.6 | 218.8 | 200.7
Repair costs | 141.0 | 153.4 | 149.0
Outside services | 146.8 | 176.2 | 170.8
Commodities expense | 77.0 | 102.7 | 137.1
Sales related costs | 53.0 | 58.7 | 55.2
Other expenses | 35.4 | (29.1) | (3.0)
Adjusted EBITDA | 150.8 | 207.5 | 242.4
Segment, Expenditure, Addition to Long-Lived Assets | 18.6 | 47.6 | 35.3
Income from equity affiliates | 0.0 | 0.0 | 0.0
Corporate and Other (1) |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from physical sale of coal | 45.8 | 228.8 | 1.7
Other expenses |  |  |
Adjusted EBITDA | (90.2) | (12.2) | 104.8
Segment, Expenditure, Addition to Long-Lived Assets | 7.9 | 11.4 | 3.5
Income from equity affiliates | $ (11.5) | $ (6.9) | $ (131.2)

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