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Equity Method Investments - Textual (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]        
Net income   $ 403.5 $ 815.6 $ 1,319.1
Changes in tax reserves   0.5 (0.8) (1.5)
Revenue from physical sale of coal   4,236.7 4,946.7 4,981.9
Equity method investment, current assets $ 1,780.7 1,780.7 2,019.7  
Equity method investment, current liabilities $ 827.5 827.5 979.0  
Shoal Creek insurance recovery   $ 109.5 0.0 0.0
Equity Ownership, Excluding Consolidated Entity and Equity Method Investee, Percentage 25.00% 25.00%    
Cash receipts from Middlemount Coal Pty Ltd and other investments   $ 0.4 2.6 171.8
Percentage Equity Ownership, Unrelated Party 75.00% 75.00%    
Equity method investment related to Middlemount        
Schedule of Equity Method Investments [Line Items]        
Revenue from physical sale of coal   $ 229.0 219.0 441.0
Equity method investment, current assets $ 62.9 62.9 48.2  
Equity method investment, noncurrent assets 224.1 224.1 199.5  
Equity method investment, current liabilities 146.2 146.2 76.6  
Equity method investment, noncurrent liabilities $ 25.8 25.8 58.2  
Equity method investment related to Middlemount        
Schedule of Equity Method Investments [Line Items]        
Cash receipts from Middlemount   $ 0.0 0.0 168.4
Equity method investment related to Middlemount        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage of equity method investment 50.00% 50.00%    
R3 Renewables LLC        
Schedule of Equity Method Investments [Line Items]        
Contributions to Equity Method Investments   $ 11.3 $ 8.0 $ 10.9
Cash receipts from Middlemount Coal Pty Ltd and other investments $ 11.4