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Commitments and Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Aug. 08, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 09, 2015
buyer
Dec. 31, 2007
USD ($)
Long-term Purchase Commitment [Line Items]          
Take-or-pay arrangement term (up to) 20 years        
Take-or-pay obligations $ 1,200.0        
Take or pay obligations due in one year 103.0        
Patriot Federal Black Lung, Payment for Settlement   $ 72.0      
Patriot Federal Black Lung, Settlement Fees   4.2      
Patriot Federal Black Lung, Gain (Loss) Due to Settlement   $ 3.9      
Patriot Coal Corporation          
Long-term Purchase Commitment [Line Items]          
Number of Buyers | buyer       2  
Patriot Coal Corporation | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Black Lung Occupational Disease Liability          
Long-term Purchase Commitment [Line Items]          
Loss contingency accrual     $ 82.3    
Patriot Coal Corporation | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff | Black Lung Occupational Disease Liability          
Long-term Purchase Commitment [Line Items]          
Loss contingency accrual         $ 150.0
Capital Additions          
Long-term Purchase Commitment [Line Items]          
Unrecorded unconditional purchase obligation (within next five years) 86.1        
Unrecorded unconditional purchase obligation (within next 12 months) $ 79.3