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Other Events Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 16, 2024
USD ($)
Oct. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Jun. 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       $ 5,000,000   5,000,000  
Common stock repurchase amount including commission fees         $ 80,500,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount     $ 569,600,000   $ 569,600,000    
Stock Repurchased During Period, Shares | shares     0   3,200,000    
Shoal Creek insurance recovery     $ (109,500,000) 0 $ (109,500,000) 0  
Storm damage provision for materials and supplies inventories       4,000,000   4,000,000  
Storm damage provision for buildings and equipment       1,000,000   1,000,000  
Provision for Other Losses       28,700,000   28,700,000  
Provision for other losses related to longwall development and other costs       17,800,000   17,800,000  
Provision for other losses for equipment       $ 10,900,000   10,900,000  
Proceeds from Insurance Settlement, Investing Activities         5,600,000 $ 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     103,900,000   103,900,000    
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     4,000,000   4,000,000    
North Antelope Rochelle Mine              
Other Commercial Events [Line Items]              
Storm Damage Provision     $ 1,900,000   $ 3,700,000    
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