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Other Events Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 16, 2024
USD ($)
Oct. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2023
AUD ($)
Other Commercial Events [Line Items]              
Revenue from Collaborative Arrangement, Excluding Revenue from Contract with Customer             $ 30.0
Revenue related to excess port and rail capacity agreement           $ 19,200,000  
Storm Damage Provision       $ 3,300,000   8,300,000  
Common stock repurchase amount including commission fees     $ 100,000,000   $ 180,500,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 469,600,000   $ 469,600,000    
Stock Repurchased During Period, Shares | shares     4,500,000   7,700,000    
Shoal Creek insurance recovery     $ 0 $ 0 $ (109,500,000) 0  
Provision for Other Losses           28,700,000  
Provision for other losses related to longwall development and other costs           17,800,000  
Provision for other losses for equipment           10,900,000  
Proceeds from Insurance Settlement, Investing Activities         10,900,000 0  
Fair Value of Assets Acquired         153,400,000    
Asset Acquisition, Consideration Transferred, Transaction Cost         9,400,000    
Asset Acquisition, Consideration Transferred, Excluding Transaction Cost         134,400,000    
Noncash or Part Noncash Acquisition, Value of Assets Acquired         9,600,000    
Loss Contingency, Receivable     5,700,000   5,700,000    
Proceeds From Insurance Settlement         103,800,000    
Wards Well coal deposit              
Other Commercial Events [Line Items]              
Contingent royalty $ 200,000,000            
Treasury Stock, Common              
Other Commercial Events [Line Items]              
Accrued excise taxes related to common stock repurchases     $ 5,000,000   5,000,000    
North Antelope Rochelle Mine | Buildings and equipment              
Other Commercial Events [Line Items]              
Storm Damage Provision           1,000,000  
North Antelope Rochelle Mine | incremental repair costs              
Other Commercial Events [Line Items]              
Storm Damage Provision         $ 3,700,000 3,300,000  
North Antelope Rochelle Mine | Material and supplies              
Other Commercial Events [Line Items]              
Storm Damage Provision           $ 4,000,000  
Shoal Creek Mine              
Other Commercial Events [Line Items]              
Business interruption and property loss limits on insurance claim, amount   $ 125,000,000          
Deductible amount   $ 50,000,000