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Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Feb. 03, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
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, (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, (3) price risk and the variability of cash flows related to forecasted diesel fuel purchased for use in its operations and (4) interest rate risk on long-term debt. 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. The Company had no diesel fuel or interest rate derivatives in place as of December 31, 2023.
      
Income tax provision (benefit)   $ 308,800,000 $ (38,800,000) $ 22,800,000  
Accounts receivable, payment term   30 days      
Interest costs capitalized   $ 0 0 0  
Royalty Expense   $ 448,300,000 450,000,000 263,000,000  
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   3,300,000 2,900,000 8,300,000  
Restructuring charges   200,000      
Foreign currency remeasurement gain (loss)   (5,300,000) (2,700,000) (3,100,000)  
Foreign currency translation adjustment   (900,000) 1,600,000 1,000,000.0  
Asset impairment   2,000,000.0 11,200,000 0  
Asset impairment charges related to long-lived assets   $ 0 $ 9,500,000 $ 0  
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%     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   30 years      
Maximum | Machinery and equipment | Buildings and improvements          
Summary of Significant Accounting Policies Textuals          
Useful life   30 years