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Other Events (Details)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Apr. 16, 2024
USD ($)
Oct. 31, 2023
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
AUD ($)
Other Commercial Events [Line Items]            
Shoal Creek insurance recovery     $ 0.0 $ 109.5 $ 0.0  
Revenue related to excess port and rail capacity agreement         19.2  
Other Noncash Income     0.0 0.3 9.6  
Proceeds From Collaborative Arrangement Related to Port and Rail Capacity           $ 10.0
Collaborative Arrangement, Revenue Not from Contract with Customer           $ 30.0
Collaborative Arrangement Related to Port and Rail Capacity, Revenue Not from Contract with Customer         6.7  
Insurance proceeds attributable to Shoal Creek equipment losses     $ 0.0 10.9 0.0  
Wards Well coal deposit            
Other Commercial Events [Line Items]            
Contingent royalty $ 200.0          
Fair Value of Assets Acquired 153.4          
Asset Acquisition, Consideration Transferred, Transaction Cost 9.4          
Asset Acquisition, Consideration Transferred, Excluding Transaction Cost 134.4          
Noncash or Part Noncash Acquisition, Value of Assets Acquired $ 9.6          
North Antelope Rochelle Mine            
Other Commercial Events [Line Items]            
Storm Damage Provision         12.2  
North Antelope Rochelle Mine | Materials and supplies inventories            
Other Commercial Events [Line Items]            
Storm Damage Provision         4.0  
North Antelope Rochelle Mine | Buildings and equipment            
Other Commercial Events [Line Items]            
Provision for buildings and equipment         1.0  
North Antelope Rochelle Mine | Incremental repair costs            
Other Commercial Events [Line Items]            
Storm Damage Provision       3.7 7.2  
Shoal Creek            
Other Commercial Events [Line Items]            
Shoal Creek insurance recovery       109.5    
Provision for loss related to fire         28.7  
Loss limits on insurance claim, amount   $ 125.0        
Deductible   $ 50.0        
Shoal Creek | Longwall and development and other costs            
Other Commercial Events [Line Items]            
Provision for loss related to fire         17.8  
Shoal Creek | Equipment deemed inoperable            
Other Commercial Events [Line Items]            
Provision for loss related to fire       $ 10.9 $ 10.9