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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Mar. 14, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-34474    
Entity Registrant Name CENTURY ALUMINUM COMPANY    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-3070826    
Entity Address, Address Line One One South Wacker Drive    
Entity Address, Postal Zip Code 60606    
Entity Address, Address Line Two Suite 1000    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
City Area Code 312    
Local Phone Number 696-3101    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol CENX    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 453
Entity Common Stock, Shares Outstanding   92,695,933  
Documents Incorporated by Reference
All or a portion of Items 10 through 14 in Part III of this Form 10-K are incorporated by reference to the Registrant’s definitive proxy statement on Schedule 14A for its 2024 Annual Meeting of Stockholders, which will be filed within 120 days after the close of the fiscal year covered by this report on Form 10-K, or if the Registrant’s Schedule 14A is not filed within such period, will be included in an amendment to this Report on Form 10-K which will be filed within such 120 day period.
    
Entity Central Index Key 0000949157    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false