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Segment Information - Segment Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reportable segment results        
Revenues $ 1,012.1 $ 1,088.0 $ 2,839.2 $ 3,113.6
Segment Adjusted EBITDA excluding corporate and other segment 127.4 227.9 374.8 734.1
Loss from equity affiliates 2.6 2.1 10.2 7.1
Additions to property, plant, equipment and mine development 116.2 98.7 280.8 265.7
Shoal Creek insurance recovery 0.0 0.0 0.0 109.5
Seaborne Thermal        
Reportable segment results        
Revenues 242.7 313.2 702.9 904.6
Labor costs 35.8 38.8 108.6 117.9
Repair costs 29.3 44.6 83.1 118.5
Outside services 31.2 35.4 84.9 97.7
Commodities expense 20.6 23.0 59.6 69.4
Sales related costs 54.0 57.8 153.4 162.5
Other expenses 30.8 (6.4) 54.6 20.4
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 41.0 120.0 158.7 318.2
Additions to property, plant, equipment and mine development 8.2 17.4 26.3 50.1
Seaborne Metallurgical        
Reportable segment results        
Revenues 258.9 242.5 731.2 783.8
Labor costs 62.4 54.1 178.7 155.8
Repair costs 48.5 63.3 136.9 139.5
Outside services 100.4 77.0 258.3 186.3
Commodities expense 17.1 14.8 43.1 46.4
Sales related costs 56.1 52.9 168.8 166.9
Other expenses (53.4) (47.4) (86.4) (130.8)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 27.8 27.8 31.8 219.7
Additions to property, plant, equipment and mine development 87.8 64.5 213.9 179.7
Shoal Creek insurance recovery   80.8   80.8
Powder River Basin        
Reportable segment results        
Revenues 301.4 305.3 852.7 781.3
Labor costs 56.5 50.9 159.2 152.2
Repair costs 38.8 33.9 102.9 94.9
Outside services 35.0 31.9 94.9 89.8
Commodities expense 42.3 41.7 116.8 117.2
Sales related costs 66.2 82.5 215.4 212.6
Other expenses 10.9 12.7 32.5 28.7
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 51.7 51.7 131.0 85.9
Additions to property, plant, equipment and mine development 11.5 9.8 20.9 22.3
Other U.S. Thermal        
Reportable segment results        
Revenues 192.0 216.7 515.8 610.3
Labor costs 54.3 54.8 153.4 162.8
Repair costs 40.5 36.7 114.2 104.9
Outside services 40.8 36.5 114.2 109.5
Commodities expense 19.2 19.2 56.4 58.3
Sales related costs 11.5 14.3 30.9 40.0
Other expenses 18.8 26.8 (6.6) 24.5
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 6.9 28.4 53.3 110.3
Additions to property, plant, equipment and mine development 7.7 4.9 17.7 10.0
Total Segment Excluding Corporate and Other Operating Segment        
Reportable segment results        
Segment Adjusted EBITDA excluding corporate and other segment 127.4 227.9 374.8 734.1
Additions to property, plant, equipment and mine development excluding corporate and other segment 115.2 96.6 278.8 262.1
Total reportable segment revenue $ 995.0 $ 1,077.7 $ 2,802.6 $ 3,080.0