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Segment Information - Segment Results (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reportable segment results        
Revenues $ 890.1 $ 1,042.0 $ 1,827.1 $ 2,025.6
Total Adjusted EBITDA 93.3 309.7 237.3 470.2
Additions to property, plant, equipment and mine development 94.2 105.6 164.6 167.0
Loss from equity affiliates (0.9) (1.3) (7.6) (5.0)
Shoal Creek insurance recovery 0.0 109.5 0.0 109.5
Seaborne Thermal        
Reportable segment results        
Revenues 195.1 307.5 460.2 591.4
Labor costs 37.7 41.4 72.8 79.1
Repair costs 29.0 36.0 53.8 73.9
Outside services 26.9 31.3 53.7 62.3
Commodities expense 19.9 22.5 39.0 46.4
Sales related costs 44.8 52.6 99.4 104.7
Other expenses 3.3 19.3 23.8 26.8
Total Adjusted EBITDA 33.5 104.4 117.7 198.2
Additions to property, plant, equipment and mine development 9.6 18.2 18.1 32.7
Loss from equity affiliates   0.0 0.0 0.0
Seaborne Metallurgical        
Reportable segment results        
Revenues 252.2 294.3 472.3 541.3
Labor costs 61.3 52.4 116.3 101.7
Repair costs 41.4 43.5 88.4 76.2
Outside services 85.8 54.7 157.9 109.3
Commodities expense 12.6 15.9 26.0 31.6
Sales related costs 58.7 62.0 112.7 114.0
Other expenses 1.6 (77.8) (33.0) (83.4)
Total Adjusted EBITDA (9.2) 143.6 4.0 191.9
Additions to property, plant, equipment and mine development 72.9 75.8 126.1 115.2
Loss from equity affiliates   0.0 0.0 0.0
Shoal Creek insurance recovery   80.8   80.8
Powder River Basin        
Reportable segment results        
Revenues 275.7 221.9 551.3 476.0
Labor costs 52.9 49.5 102.7 101.3
Repair costs 32.6 26.1 64.1 61.0
Outside services 28.8 26.0 59.9 57.9
Commodities expense 35.8 34.4 74.5 75.5
Sales related costs 73.9 60.3 149.2 130.1
Other expenses 8.7 7.8 21.6 16.0
Total Adjusted EBITDA 43.0 17.8 79.3 34.2
Additions to property, plant, equipment and mine development 5.5 7.5 9.4 12.5
Loss from equity affiliates   0.0 0.0 0.0
Other U.S. Thermal        
Reportable segment results        
Revenues 155.1 202.0 323.8 393.6
Labor costs 48.9 55.1 99.1 108.0
Repair costs 39.6 35.8 73.7 68.2
Outside services 37.6 36.4 73.4 73.0
Commodities expense 17.7 19.8 37.2 39.1
Sales related costs 9.4 12.1 19.4 25.7
Other expenses (11.6) 7.4 (25.4) (2.3)
Total Adjusted EBITDA 13.5 35.4 46.4 81.9
Additions to property, plant, equipment and mine development 5.4 2.8 10.0 5.1
Loss from equity affiliates   0.0 0.0 0.0
Corporate and Other (1)        
Reportable segment results        
Revenues 12.0 16.3 19.5 23.3
Total Adjusted EBITDA 12.5 8.5 (10.1) (36.0)
Additions to property, plant, equipment and mine development 0.8 $ 1.3 1.0 1.5
Loss from equity affiliates $ (0.9)   $ (7.6) $ (5.0)