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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 |  |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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