v3.26.1
Segment Information - Segment Results (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reportable segment results        
Revenues $ 1,003.2 $ 890.1 $ 1,976.5 $ 1,827.1
Segment Adjusted EBITDA excluding corporate and other segment 54.9 80.8 157.9 247.4
Additions to property, plant, equipment and mine development 58.4 94.2 143.8 164.6
Seaborne Thermal        
Reportable segment results        
Revenues 230.6 195.1 428.1 460.2
Labor costs 37.1 37.7 72.8 72.8
Repair costs 31.0 29.0 60.4 53.8
Outside services 31.8 26.9 55.0 53.7
Commodities expense 37.0 19.9 58.1 39.0
Sales related costs 42.7 44.8 82.2 99.4
Other expenses (1.1) 3.3 (1.0) 23.8
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 52.1 33.5 100.6 117.7
Additions to property, plant, equipment and mine development 9.6 9.6 18.2 18.1
Seaborne Metallurgical        
Reportable segment results        
Revenues 358.3 252.2 641.3 472.3
Labor costs 78.5 61.3 149.7 116.3
Repair costs 70.0 41.4 134.5 88.4
Outside services 113.6 85.8 215.2 157.9
Commodities expense 28.5 12.6 41.7 26.0
Sales related costs 93.1 58.7 162.1 112.7
Other expenses (8.4) 1.6 (37.9) (33.0)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization (17.0) (9.2) (24.0) 4.0
Additions to property, plant, equipment and mine development 30.7 72.9 85.7 126.1
Powder River Basin        
Reportable segment results        
Revenues 223.8 275.7 513.3 551.3
Labor costs 55.9 52.9 116.0 102.7
Repair costs 28.9 32.6 65.5 64.1
Outside services 30.2 28.8 68.5 59.9
Commodities expense 52.8 35.8 103.7 74.5
Sales related costs 48.6 73.9 112.4 149.2
Other expenses 14.5 8.7 30.6 21.6
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization (7.1) 43.0 16.6 79.3
Additions to property, plant, equipment and mine development 10.4 5.5 25.8 9.4
Other U.S. Thermal        
Reportable segment results        
Revenues 163.2 155.1 347.7 323.8
Labor costs 48.7 48.9 100.0 99.1
Repair costs 29.4 39.6 61.8 73.7
Outside services 36.1 37.6 68.8 73.4
Commodities expense 25.5 17.7 48.4 37.2
Sales related costs 12.2 9.4 24.1 19.4
Other expenses (15.6) (11.6) (20.1) (25.4)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 26.9 13.5 64.7 46.4
Additions to property, plant, equipment and mine development 5.5 5.4 10.7 10.0
Total Segment Excluding Corporate and Other Operating Segment        
Reportable segment results        
Segment Adjusted EBITDA excluding corporate and other segment 54.9 80.8 157.9 247.4
Additions to property, plant, equipment and mine development excluding corporate and other segment 56.2 93.4 140.4 163.6
Total reportable segment revenue $ 975.9 $ 878.1 $ 1,930.4 $ 1,807.6