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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 2 Months Ended 3 Months Ended 6 Months Ended 23 Months Ended 9 Months Ended 23 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Apr. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Scenario, Forecast [Member]
Apr. 30, 2014
Scenario, Forecast [Member]
Maximum RD&D Program Funding by DOE                 $ 280
ACTDO DOE Funding – Increment 1               33.7  
RD&D Program Funding by DOE           79.50%     80.00%
RD&D Program Funding by USEC           20.50%     20.00%
RD&D Program Qualifying Expenditures - Total 352.2 352.2   352.2          
RD&D Program Qualifying Expenditures - DOE Share Total 280 280   280          
RD&D Program Qualifying Expenditures – USEC Share Total 72.2 72.2   72.2          
RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable 0.4 0.4   0.4     20.1    
RD&D Program Qualifying Expenditures - DOE Share - Other Income   8.4 40.7 34.6 88.3        
Advanced technology costs $ 7.0 $ 18.0 $ 46.2 $ 51.3 $ 105.5