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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 5 Months Ended 23 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Sep. 30, 2014
Scenario, Forecast [Member]
Apr. 30, 2014
Scenario, Forecast [Member]
Maximum funding for RD&D Program         $ 350
Maximum RD&D Program Funding by DOE       33.7 280.0
ACTDO DOE Funding – Increment 1       33.7  
RD&D Program Funding by DOE         80.00%
RD&D Program Funding by USEC         20.00%
RD&D Program Qualifying Expenditures To Date 341.0        
RD&D Program Qualifying Expenditures To Date - DOE Share 272.8        
RD&D Program Qualifying Expenditures To Date - DOE Share - Received 255.3        
RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable 17.5   20.1    
RD&D Program Qualifying Expenditures - DOE Share $ 26.2 $ 47.6