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Advanced Technology Costs and Other Income (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015
Maximum RD&D Program Funding by DOE |  | $ 280.0 |
RD&D Program Funding by DOE |  | 80.00% |
RD&D Program Funding by USEC |  | 20.00% |
Other advanced technology costs | $ 4.0 | $ 7.0 | $ 5.8

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- Definition Amount of other research and development expense. + References Reference 1: 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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