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Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Feb. 03, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 (benefit)   $ 108,800,000 $ 308,800,000 $ (38,800,000)    
Accounts receivable, payment term   30 days        
Interest costs capitalized   $ 5,800,000 0 0    
Royalty Expense   $ 370,000,000.0 448,300,000 450,000,000.0    
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   4,400,000 3,300,000 2,900,000    
Restructuring charges   3,400,000        
Foreign Currency Remeasurement Gains (Losses)   (32,300,000) 5,300,000 2,700,000    
Foreign currency translation adjustment   4,300,000 (900,000) 1,600,000    
Asset impairment   0 2,000,000.0 11,200,000    
Asset impairment charges related to long-lived assets   0 $ 0 $ 9,500,000    
Patriot Federal Black Lung, Payment for Settlement         $ 72,000,000  
Patriot Federal Black Lung, Settlement Fees         $ 4,200,000  
Patriot Federal Black Lung, Gain (Loss) Due to Settlement   $ 3,900,000        
Letter of Credit            
Summary of Significant Accounting Policies Textuals            
Stated interest rate   0.75%        
Commitment fee percentage 0.50%          
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
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   29 years        
Maximum | Machinery and equipment | Buildings and improvements            
Summary of Significant Accounting Policies Textuals            
Useful life   29 years