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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Advanced Technology Costs and Other Income    
Maximum funding for RD&D Program $ 350  
RD&D Program Funding by DOE 80.00%  
RD&D Program Funding by USEC 20.00%  
Maximum RD&D Program Funding by DOE 280  
Maximum RD&D Program Funding by USEC 70  
RD&D Program Funding by DOE To Date 177.8  
RD&D Program Funding by DOE - Increment 1 87.7  
RD&D Program Funding by DOE - Increment 2 45.7  
RD&D Program Funding by DOE - Increment 3 44.4  
RD&D Program Qualifying Expenditures To Date 174.6  
RD&D Program Qualifying Expenditures To Date - DOE Share 139.7  
RD&D Program Qualifying Expenditures To Date - DOE Share - Received 106.7  
RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable 33.0 4.4
RD&D Program Qualifying Expenditures 59.5  
RD&D Program Qualifying Expenditures - DOE Share 47.6  
RD&D Program Funding - FY13 Appropriation Annual Rate $ 110.0