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Revenue Recognition - Revenue by Product Type and Market (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue $ 1,342.5 $ 679.0 $ 3,355.8 $ 2,053.7
Other Income 2.7 1.0 8.3 7.1
Designated as Hedging Instrument        
Disaggregation of Revenue [Line Items]        
Unrealized (loss) gain recognized in income on derivatives 88.8 (237.8) (229.4) (271.5)
(Loss) gain realized in income on derivatives (118.5) (14.0) (311.2) (24.5)
Total (loss) gain recognized in income (29.7) (251.8) (540.6) (296.0)
Derivative contracts related to forecasted sales | Designated as Hedging Instrument        
Disaggregation of Revenue [Line Items]        
Unrealized (loss) gain recognized in income on derivatives 90.4 (238.4) (235.1) (264.0)
(Loss) gain realized in income on derivatives (117.4) (13.1) (308.0) (28.1)
Total (loss) gain recognized in income (27.0) (251.5) (543.1) (292.1)
Financial trading contracts | Designated as Hedging Instrument        
Disaggregation of Revenue [Line Items]        
Unrealized (loss) gain recognized in income on derivatives (0.2) 0.0 10.1 0.8
(Loss) gain realized in income on derivatives 0.5 0.7 0.6 0.6
Total (loss) gain recognized in income 0.3 0.7 10.7 1.4
Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 903.1 691.0 2,413.8 1,846.1
Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 309.9 176.8 1,161.2 383.8
Other (2)        
Disaggregation of Revenue [Line Items]        
Revenue 129.5 (188.8) (219.2) (176.2)
Domestic | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 594.8 469.4 1,579.1 1,345.0
Export | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 308.3 221.6 834.7 501.1
Export | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 309.9 176.8 1,161.2 383.8
Seaborne Thermal Mining        
Disaggregation of Revenue [Line Items]        
Revenue 353.2 260.7 959.3 631.2
Seaborne Thermal Mining | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 353.1 260.5 958.7 630.4
Seaborne Thermal Mining | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Seaborne Thermal Mining | Other (2)        
Disaggregation of Revenue [Line Items]        
Revenue 0.1 0.2 0.6 0.8
Seaborne Thermal Mining | Domestic | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 44.8 41.1 125.0 132.7
Seaborne Thermal Mining | Export | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 308.3 219.4 833.7 497.7
Seaborne Thermal Mining | Export | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Seaborne Metallurgical Mining        
Disaggregation of Revenue [Line Items]        
Revenue 310.7 179.5 1,165.8 388.0
Seaborne Metallurgical Mining | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Seaborne Metallurgical Mining | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 309.9 176.8 1,161.2 383.8
Seaborne Metallurgical Mining | Other (2)        
Disaggregation of Revenue [Line Items]        
Revenue 0.8 2.7 4.6 4.2
Seaborne Metallurgical Mining | Domestic | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Seaborne Metallurgical Mining | Export | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Seaborne Metallurgical Mining | Export | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 309.9 176.8 1,161.2 383.8
Powder River Basin Mining        
Disaggregation of Revenue [Line Items]        
Revenue 290.5 247.1 771.4 724.1
Powder River Basin Mining | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 290.2 247.3 771.6 724.5
Powder River Basin Mining | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Powder River Basin Mining | Other (2)        
Disaggregation of Revenue [Line Items]        
Revenue 0.3 (0.2) (0.2) (0.4)
Powder River Basin Mining | Domestic | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 290.2 247.3 771.6 724.5
Powder River Basin Mining | Export | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Powder River Basin Mining | Export | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Other U.S. Thermal Mining        
Disaggregation of Revenue [Line Items]        
Revenue 261.4 184.6 689.4 496.0
Other U.S. Thermal Mining | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 259.8 183.2 683.5 491.2
Other U.S. Thermal Mining | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Other U.S. Thermal Mining | Other (2)        
Disaggregation of Revenue [Line Items]        
Revenue 1.6 1.4 5.9 4.8
Other U.S. Thermal Mining | Domestic | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 259.8 181.0 682.5 487.8
Other U.S. Thermal Mining | Export | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 2.2 1.0 3.4
Other U.S. Thermal Mining | Export | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other (1)        
Disaggregation of Revenue [Line Items]        
Revenue 126.7 (192.9) (230.1) (185.6)
Corporate and Other (1) | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other (1) | Trading and Brokerage Coal Deliveries        
Disaggregation of Revenue [Line Items]        
Revenue 150.7 56.9 294.0 98.0
Corporate and Other (1) | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other (1) | Other (2)        
Disaggregation of Revenue [Line Items]        
Revenue 126.7 192.9 230.1 (185.6)
Corporate and Other (1) | Domestic | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other (1) | Export | Thermal coal        
Disaggregation of Revenue [Line Items]        
Revenue 0.0 0.0 0.0 0.0
Corporate and Other (1) | Export | Metallurgical coal        
Disaggregation of Revenue [Line Items]        
Revenue $ 0.0 $ 0.0 $ 0.0 $ 0.0