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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)