XML 12 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Document and Entity Information Document
Jul. 01, 2020
Jun. 18, 2020
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Jul. 01, 2020  
Entity Registrant Name Century Aluminum Company  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-34474  
Entity Tax Identification Number 13-3070826  
Entity Address, Address Line One One South Wacker Drive  
Entity Address, Address Line Two Suite 1000  
Entity Address, City or Town Chicago  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60606  
City Area Code (312)  
Local Phone Number 696-3101  
Written Communications   false
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Title of 12(b) Security Common Stock, $0.01 par value per share  
Trading Symbol CENX  
Security Exchange Name NASDAQ  
Entity Emerging Growth Company false  
Entity Central Index Key 0000949157  
Amendment Flag false