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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended 19 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
RD&D Program Qualifying Expenditures - DOE Share $ 35.9 $ 34.6 $ 124.2 $ 44.6      
Maximum funding for RD&D Program           350  
Maximum funding for RD&D Program - Revised Estimate           320  
Annual Rate of Authorized Government RD&D Program Funding         110    
RD&D Program Funding by DOE           80.00%  
RD&D Program Funding by USEC           20.00%  
RD&D Program Funding by DOE To Date           241.3  
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 Funding by DOE - Increment 4           49.9  
RD&D Program Funding by DOE - Increment 5           13.6  
RD&D Program Qualifying Expenditures To Date 270.2   270.2        
RD&D Program Qualifying Expenditures To Date - DOE Share 216.2   216.2        
RD&D Program Qualifying Expenditures To Date - DOE Share - Received 191.4   191.4        
RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable 24.8 4.4 24.8 4.4      
RD&D Program Funding - DOE Advance 0   0       2.4
RD&D Program Qualifying Expenditures     155.1 55.7      
Government [Member]
              
RD&D Program Qualifying Expenditures - DOE Share     $ 124.1 $ 44.6