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Other Events (Details)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Nov. 25, 2024
USD ($)
Apr. 16, 2024
USD ($)
Oct. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
AUD ($)
Dec. 31, 2022
USD ($)
Other Commercial Events [Line Items]              
Shoal Creek insurance recovery       $ 109.5 $ 0.0   $ 0.0
Revenue related to excess port and rail capacity agreement         19.2    
Other Noncash Income       0.3 9.6   0.0
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       10.9 0.0   0.0
Deposit associated with planned acquisition       75.0 0.0   $ 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          
Anglo American Acquisition              
Other Commercial Events [Line Items]              
Payments to Acquire Businesses, Gross $ 75.0            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 1,000.0            
Upfront cash payment for planned acquisition 2,050.0            
Fix deferred cash payments for planned acquisition 725.0            
Payments To Acquire Businesses, Maximum Total Consideration $ 3,775.0            
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        
Insurance proceeds attributable to Shoal Creek equipment losses       $ 10.9      
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