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Other Events Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended
Nov. 25, 2024
Apr. 16, 2024
Oct. 31, 2023
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jan. 15, 2025
Other Commercial Events [Line Items]                
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 469,600,000   $ 469,600,000    
Shoal Creek insurance recovery       $ 0 $ (109,500,000) 0 $ (109,500,000)  
Proceeds from Insurance Settlement, Investing Activities           $ 0 5,600,000  
Anglo American Acquisition                
Other Commercial Events [Line Items]                
Upfront cash payment for planned acquisition $ 2,058,000,000.000              
Payments to Acquire Businesses, Gross 75,000,000              
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount 1,004,000,000.000              
Payments To Acquire Businesses, Maximum Total Consideration 3,788,000,000              
Fixed deferred cash payments for planned acquisition $ 726,000,000              
Future Maximum Payments to Acquire Additional Interest in Business Combination               $ 13,000,000
Additional Interest to be Acquired in Business Combination               0.50%
Wards Well coal deposit                
Other Commercial Events [Line Items]                
Fair Value of Assets Acquired   $ 153,400,000            
Asset Acquisition, Consideration Transferred, Excluding Transaction Cost   134,400,000            
Asset Acquisition, Consideration Transferred, Transaction Cost   9,400,000            
Noncash or Part Noncash Acquisition, Value of Assets Acquired   9,600,000            
Contingent royalty   $ 200,000,000            
Shoal Creek Mine                
Other Commercial Events [Line Items]                
Shoal Creek insurance recovery             $ (109,500,000)  
Business interruption and property loss limits on insurance claim, amount     $ 125,000,000          
Deductible amount     $ 50,000,000