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Segment and Geographic Information - Segment Results (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal $ 3,861.5 $ 4,236.7 $ 4,946.7
Segment Reporting Information Adjusted EBITDA excluding corporate and other segment 525.8 961.9 1,376.1
Segment, Expenditure, Addition to Long-Lived Assets 411.4 401.3 348.3
Loss (income) from equity affiliates 14.4 (11.5) (6.9)
Shoal Creek insurance recovery 0.0 109.5 0.0
Seaborne Thermal      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 908.5 1,213.9 1,329.7
Labor costs 140.3 157.2 148.8
Repair costs 113.0 152.8 154.4
Outside services 111.5 128.7 122.7
Commodities expense 80.6 88.6 97.0
Sales related costs 196.3 224.3 207.4
Other expenses 44.6 32.3 22.6
Adjusted EBITDA 222.2 430.0 576.8
Segment, Expenditure, Addition to Long-Lived Assets 39.8 73.2 62.0
Seaborne Metallurgical      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 1,036.6 1,055.6 1,301.9
Labor costs 246.1 212.7 187.2
Repair costs 195.6 190.8 151.3
Outside services 355.0 258.9 205.1
Commodities expense 58.7 59.6 61.5
Sales related costs 238.2 231.6 259.0
Other expenses (113.4) (140.5) (0.3)
Adjusted EBITDA 56.4 242.5 438.1
Segment, Expenditure, Addition to Long-Lived Assets 309.4 266.6 186.4
Shoal Creek insurance recovery 80.8    
Powder River Basin      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 1,153.0 1,098.8 1,198.1
Labor costs 212.7 206.8 201.1
Repair costs 145.4 131.7 154.9
Outside services 130.3 123.2 138.0
Commodities expense 160.8 158.5 180.2
Sales related costs 281.1 297.5 341.9
Other expenses 46.9 42.5 28.3
Adjusted EBITDA 175.8 138.6 153.7
Segment, Expenditure, Addition to Long-Lived Assets 33.1 35.0 40.9
Other U.S. Thermal      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 707.3 822.6 888.2
Labor costs 205.3 218.6 218.8
Repair costs 150.0 141.0 153.4
Outside services 147.7 146.8 176.2
Commodities expense 76.3 77.0 102.7
Sales related costs 43.1 53.0 58.7
Other expenses 13.5 35.4 (29.1)
Adjusted EBITDA 71.4 150.8 207.5
Segment, Expenditure, Addition to Long-Lived Assets 24.0 18.6 47.6
Corporate and Other (1)      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 56.1 45.8 228.8
Segment, Expenditure, Addition to Long-Lived Assets 5.1 7.9 11.4
Total Segment Excluding Corporate Segment and Other Operating Segment [Domain]      
Segment Reporting Information [Line Items]      
Segment Reporting Information Adjusted EBITDA excluding corporate and other segment 525.8 961.9 1,376.1
Additions to property, plant, equipment and mine development excluding corporate and other segment 406.3 393.4 336.9
Total segment revenue excluding corporate and other operating segment $ 3,805.4 $ 4,190.9 $ 4,717.9