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Acquisition of Jamalco - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
May 02, 2023
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]          
Bargain purchase gain     $ 245,900,000 $ 0 $ 0
General Alumina Holdings Limited          
Business Acquisition [Line Items]          
Payments to acquire business $ 1.00        
Bargain purchase gain     $ 245,900,000 273,400,000  
Property, plant and equipment reduction   $ 29,000,000      
Purchase, gain reduction   $ 29,000,000      
Jamalco          
Business Acquisition [Line Items]          
Revenue since acquisition       150,300,000  
Loss of acquiree since acquisition       41,100,000  
Transaction costs       $ 1,400,000  
Jamalco          
Business Acquisition [Line Items]          
Ownership percentage     55.00%    
Jamalco | General Alumina Holdings Limited          
Business Acquisition [Line Items]          
Ownership percentage 55.00%        
Jamalco | Clarendon Alumina Production Limited          
Business Acquisition [Line Items]          
Glencore beneficial ownership 45.00%