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Commitment and Contingencies (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Commitments and Contingencies  
Minimum Power Purchase Obligation $ 500,000,000
Amount of application under DOE Loan Guarantee Program 2,000,000,000
Potential financing from Japanese export credit agencies under discussion 1,000,000,000
Upper range of potential ACP asset impairment expense 1,100,000,000
Estimated maximum potential severance liability 14,000,000
Estimated maximum potential severance liability, DOE share 9,000,000
Maximum royalty under commercial Centrifuge IP license 665,000,000
Total estimated cost of RD&D Program 350,000,000
DOE share of RD&D Program 280,000,000
USEC share of RD&D Program 70,000,000
DOE initial funding of RD&D Program 87,700,000
DOE RD&D Program funding through July 2012 26,400,000
Balance of DOE initial funding of RD&D Program 61,300,000
Unfunded DOE share of RD&D Program $ 192,300,000