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Commitment and Contingencies (Details) (USD $)
 12 Months Ended 22 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 14, 2014
Amount of application under DOE Loan Guarantee Program $ 2,000,000,000      
RD&D Program Funding - Jan 2014 appropriations       62,000,000
RD&D Program Funding by DOE Increments 5-6       29,300,000
RD&D Program Funding by DOE Increment 7       22,600,000
RD&D Program Funding - DOE Transfer Authority       56,650,000
Minimum Paducah SWU Production Under 2002 DOE-USEC Agreement 3,500,000      
NYSE Minimum 30 Day Average Closing Price $ 1.00      
NYSE 30-day average minimum market capitalization 50,000,000      
NYSE 30-Day Market Capitalization Subject to Suspension 15,000,000      
PBGC estimate of potential Portsmouth pension liability 130,000,000      
Operating Leases, Rent Expense 7,100,000 7,300,000 8,500,000  
Minimum [Member]
        
ACP Sales Royalty Rate 1.00%      
ACP Sales Royalty 100,000      
Maximum [Member]
        
ACP Sales Royalty Rate 2.00%      
ACP Sales Royalty $ 100,000,000