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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Allowance for expected losses $ 0.5 $ 0.5
Minimum | Building and Improvements    
Property, Plant and Equipment [Line Items]    
Useful life 10 years  
Minimum | Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Useful life 5 years  
Minimum | Technology and Software    
Property, Plant and Equipment [Line Items]    
Useful life 3 years  
Maximum | Building and Improvements    
Property, Plant and Equipment [Line Items]    
Useful life 45 years  
Maximum | Machinery and Equipment    
Property, Plant and Equipment [Line Items]    
Useful life 35 years  
Maximum | Technology and Software    
Property, Plant and Equipment [Line Items]    
Useful life 7 years  
Jamalco    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 55.00%  
Century Aluminum | Glencore    
Schedule of Equity Method Investments [Line Items]    
Glencore beneficial ownership 42.90%  
Glencore economic ownership 46.00%