v3.26.1
Segment Information - Segment Results (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reportable segment results    
Revenues $ 973.3 $ 937.0
Segment Adjusted EBITDA excluding corporate and other segment 103.0 166.6
Loss from equity affiliates 5.7 6.7
Additions to property, plant, equipment and mine development 85.4 70.4
Seaborne Thermal    
Reportable segment results    
Revenues 197.5 265.1
Labor costs 35.7 35.1
Repair costs 29.4 24.8
Outside services 23.2 26.8
Commodities expense 21.1 19.1
Sales related costs 39.5 54.6
Other expenses 0.1 20.5
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 48.5 84.2
Additions to property, plant, equipment and mine development 8.6 8.5
Seaborne Metallurgical    
Reportable segment results    
Revenues 283.0 220.1
Labor costs 71.2 55.0
Repair costs 64.5 47.0
Outside services 101.6 72.1
Commodities expense 13.2 13.4
Sales related costs 69.0 54.0
Other expenses (29.5) (34.6)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization (7.0) 13.2
Additions to property, plant, equipment and mine development 55.0 53.2
Powder River Basin    
Reportable segment results    
Revenues 289.5 275.6
Labor costs 60.1 49.8
Repair costs 36.6 31.5
Outside services 38.3 31.1
Commodities expense 50.9 38.7
Sales related costs 63.8 75.3
Other expenses 16.1 12.9
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 23.7 36.3
Additions to property, plant, equipment and mine development 15.4 3.9
Other U.S. Thermal    
Reportable segment results    
Revenues 184.5 168.7
Labor costs 51.3 50.2
Repair costs 32.4 34.1
Outside services 32.7 35.8
Commodities expense 22.9 19.5
Sales related costs 11.9 10.0
Other expenses (4.5) (13.8)
Segment Reporting Information Adjusted Earning Before Interest Taxes Depreciation And Amortization 37.8 32.9
Additions to property, plant, equipment and mine development 5.2 4.6
Total Segment Excluding Corporate and Other Operating Segment    
Reportable segment results    
Segment Adjusted EBITDA excluding corporate and other segment 103.0 166.6
Additions to property, plant, equipment and mine development excluding corporate and other segment 84.2 70.2
Total reportable segment revenue $ 954.5 $ 929.5