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Debt (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 14, 2013
Mar. 13, 2012
Revolving credit facility, maximum borrowing capacity $ 146,800,000        
Credit facility term loan 83,200,000 85,000,000      
Convertible senior notes 530,000,000 530,000,000      
Line of credit facility, maximum borrowing capacity 230,000,000 310,000,000   110,000,000 235,000,000
Letters of credit, capacity after Paducah       25,000,000  
Letters of credit, capacity 75,000,000     50,000,000  
Availability Block 30,000,000        
Monthly reduction in credit facility effective December 2012 5,000,000        
Maximum USEC share for RDD program under credit facility 75,000,000        
Maximum unreimbursed expenditures under credit facility 50,000,000        
Maximum unfunded unreimbursed expenditures under credit facility 20,000,000        
Maximum aggregate American Centrifuge expenditures after June 2012 under credit facility 375,000,000        
Maximum legal and regulatory spending under credit facility 5,000,000        
Spending limit on costs not RDD program allowable costs under credit facility 750,000        
Borrowings under credit facility 123,600,000 80,900,000 38,700,000    
Peak borrowings under credit facility $ 96,500,000        
Convertible senior notes [Member]
          
Debt instrument, interest rate at period end 3.00%        
Credit facility [Member]
          
Debt instrument, interest rate at period end 10.50%