v3.26.3
Segment Information - Segment Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Reportable segment results        
Revenues $ 1,096.3 $ 1,012.1 $ 3,072.8 $ 2,839.2
Segment Adjusted EBITDA excluding corporate and other segment 111.2 127.4 269.1 374.8
Additions to property, plant, equipment and mine development 59.8 116.2 203.6 280.8
Seaborne Thermal        
Reportable segment results        
Revenues 241.6 242.7 669.7 702.9
Labor costs 35.8 35.8 108.6 108.6
Repair costs 30.7 29.3 91.1 83.1
Outside services 26.7 31.2 81.7 84.9
Commodities expense 31.7 20.6 89.8 59.6
Sales related costs 48.3 54.0 130.5 153.4
Other expenses 2.9 30.8 1.9 54.6
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 65.5 41.0 166.1 158.7
Additions to property, plant, equipment and mine development 7.1 8.2 25.3 26.3
Seaborne Metallurgical        
Reportable segment results        
Revenues 366.0 258.9 1,007.3 731.2
Labor costs 75.0 62.4 224.7 178.7
Repair costs 76.2 48.5 210.7 136.9
Outside services 110.9 100.4 326.1 258.3
Commodities expense 24.0 17.1 65.7 43.1
Sales related costs 86.2 56.1 248.3 168.8
Other expenses (11.5) (53.4) (49.4) (86.4)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 5.2 27.8 (18.8) 31.8
Additions to property, plant, equipment and mine development 36.7 87.8 122.4 213.9
Powder River Basin        
Reportable segment results        
Revenues 268.1 301.4 781.4 852.7
Labor costs 55.8 56.5 171.8 159.2
Repair costs 28.2 38.8 93.7 102.9
Outside services 34.8 35.0 103.3 94.9
Commodities expense 60.3 42.3 164.0 116.8
Sales related costs 58.2 66.2 170.6 215.4
Other expenses 15.8 10.9 46.4 32.5
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 15.0 51.7 31.6 131.0
Additions to property, plant, equipment and mine development 9.2 11.5 35.0 20.9
Other U.S. Thermal        
Reportable segment results        
Revenues 206.1 192.0 553.8 515.8
Labor costs 48.9 54.3 148.9 153.4
Repair costs 31.9 40.5 93.7 114.2
Outside services 35.3 40.8 104.1 114.2
Commodities expense 30.0 19.2 78.4 56.4
Sales related costs 14.7 11.5 38.8 30.9
Other expenses 19.8 18.8 (0.3) (6.6)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 25.5 6.9 90.2 53.3
Additions to property, plant, equipment and mine development 4.7 7.7 15.4 17.7
Total Segment Excluding Corporate and Other Operating Segment        
Reportable segment results        
Segment Adjusted EBITDA excluding corporate and other segment 111.2 127.4 269.1 374.8
Additions to property, plant, equipment and mine development excluding corporate and other segment 57.7 115.2 198.1 278.8
Total reportable segment revenue $ 1,081.8 $ 995.0 $ 3,012.2 $ 2,802.6