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Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Aug. 08, 2023
Mar. 01, 2022
Summary of Significant Accounting Policies Textuals          
Corporate Hedging
From time to time, the Company may utilize various types of derivative instruments to manage its exposure to risks in the normal course of business, including (1) foreign currency exchange rate risk and the variability of cash flows associated with forecasted Australian dollar expenditures made in its Australian mining platform and (2) price risk of fluctuating coal prices related to forecasted sales or purchases of coal, or changes in the fair value of a fixed price physical sales contract. These risk management activities are actively monitored for compliance with the Company’s risk management policies.
On a limited basis, the Company engages in the direct and brokered trading of coal and freight-related contracts. Except those contracts for which the Company has elected to apply a normal purchases and normal sales exception, all derivative coal trading contracts are accounted for at fair value.
        
Income tax provision $ 8,800,000 $ 108,800,000 $ 308,800,000    
Accounts receivable, payment term 30 days        
Interest costs capitalized $ 8,000,000.0 5,800,000 0    
Royalty Expense $ 311,500,000 370,000,000.0 448,300,000    
Lease term 10 years        
Minimum annual production of federal coal mining leases on original amount 1.00%        
Monthly federal royalties payable from sale using surface mining methods 12.50%        
Monthly federal royalties payable of production using underground mining methods 8.00%        
Equity method investment $ 0 0 0    
Restructuring charges for voluntary and involuntary workforce reductions 9,500,000 4,400,000 3,300,000    
Restructuring charges 1,100,000        
Foreign Currency Remeasurement Gains (Losses) 22,400,000 (32,300,000) 5,300,000    
Foreign currency translation adjustment 3,100,000 (4,300,000) 900,000    
Asset impairment charges related to long-lived assets 0 $ 0 $ 0    
Patriot Federal Black Lung, Payment for Settlement       $ 72,000,000.0  
Patriot Federal Black Lung, Settlement Fees       4,200,000  
Patriot Federal Black Lung, Gain (Loss) Due to Settlement       $ 3,900,000  
Duration fees 20,800,000        
Commitment fees $ 25,900,000        
OBBBA federal coal royalty rate 7.00%        
Letter of Credit          
Summary of Significant Accounting Policies Textuals          
Stated interest rate 0.75%        
Senior Notes | 3.250% Convertible Senior Notes due March 2028          
Summary of Significant Accounting Policies Textuals          
Stated interest rate 3.25%        
Debt principal amount         $ 320,000,000.0
Middlemount          
Summary of Significant Accounting Policies Textuals          
Ownership percentage of equity method investment 50.00%        
Minimum | Machinery and equipment | Buildings and improvements          
Summary of Significant Accounting Policies Textuals          
Useful life 1 year        
Maximum | Land and coal interests          
Summary of Significant Accounting Policies Textuals          
Useful life 31 years        
Maximum | Machinery and equipment | Buildings and improvements          
Summary of Significant Accounting Policies Textuals          
Useful life 31 years