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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 |  |  |

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