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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 22 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 14, 2014
RD&D Program Qualifying Expenditures - DOE Share $ 30.1 $ 35.9 $ 40.7 $ 47.6 $ 47.5 $ 34.6 $ 10.0 $ 0 $ 154.3 $ 92.1 $ 3.7  
Maximum funding for RD&D Program                       350
Maximum RD&D Program Funding by DOE                       280
RD&D Program Funding by DOE                       80.00%
RD&D Program Funding by USEC                       20.00%
RD&D Program Funding by DOE To Date                       279.6
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 Funding by DOE - Increment 6                       15.7
RD&D Program Funding by DOE - Increment 7                       22.6
RD&D Program Qualifying Expenditures To Date 307.8               307.8      
RD&D Program Qualifying Expenditures To Date - DOE Share 246.3               246.3      
RD&D Program Qualifying Expenditures To Date - DOE Share - Received 226.2               226.2      
RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable 20.1       4.4       20.1 4.4    
RD&D Program Funding - DOE Advance $ 0       $ 2.4       $ 0 $ 2.4