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Segment and Geographic Information - Segment Results (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal $ 4,946.7 $ 4,981.9 $ 3,318.3
Adjusted EBITDA 1,363.9 1,844.7 916.7
Segment, Expenditure, Addition to Long-Lived Assets 348.3 221.5 183.1
Income from equity affiliates (6.9) (131.2) (82.1)
Seaborne Thermal      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 1,329.7 1,345.6 934.0
Adjusted EBITDA 576.8 647.6 353.1
Segment, Expenditure, Addition to Long-Lived Assets 62.0 38.8 88.6
Income from equity affiliates 0.0 0.0 0.0
Seaborne Metallurgical      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 1,301.9 1,616.9 727.7
Adjusted EBITDA 438.1 781.7 178.2
Segment, Expenditure, Addition to Long-Lived Assets 186.4 84.8 25.1
Income from equity affiliates 0.0 0.0 0.0
Powder River Basin      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 1,198.1 1,065.5 971.2
Adjusted EBITDA 153.7 68.2 134.9
Segment, Expenditure, Addition to Long-Lived Assets 40.9 59.1 41.4
Income from equity affiliates 0.0 0.0 0.0
Other U.S. Thermal      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 888.2 952.2 689.1
Adjusted EBITDA 207.5 242.4 164.2
Segment, Expenditure, Addition to Long-Lived Assets 47.6 35.3 24.2
Income from equity affiliates 0.0 0.0 0.0
Corporate and Other (1)      
Segment Reporting Information [Line Items]      
Revenue from physical sale of coal 228.8 1.7 (3.7)
Adjusted EBITDA (12.2) 104.8 86.3
Segment, Expenditure, Addition to Long-Lived Assets 11.4 3.5 3.8
Income from equity affiliates $ (6.9) $ (131.2) $ (82.1)