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Commitment and Contingencies (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Commitments and Contingencies  
Maximum DOE RD&D program contribution $ 300,000,000
Interim RD&D funding 44,000,000
Amount of application under DOE Loan Guarantee Program 2,000,000,000
Upper range of potential ACP asset impairment expense 1,100,000,000
Minimum annual SWU capacity for American Centrifuge Plant under 2002 DOE-USEC milestone agreement 3,500,000
Estimated maximum potential severance liability 14,000,000
Estimated maximum potential severance liability, DOE share $ 9,000,000