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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 |  |  |

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