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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2012
Mar. 14, 2013
Jun. 30, 2012
Document and Entity Information      
Entity Registrant Name USEC INC    
Entity Central Index Key 0001065059    
Current Fiscal Year End Date --12-31    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2012    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   124,001,162  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Entity Well-known Seasoned Issuer No    
Entity Public Float     $ 117,800,000
Entity Current Reporting Status Yes    
Entity Voluntary Filers No