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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Maximum RD&D Program Funding by DOE |  | $ 280 leu_MaximumRdDProgramFundingByDoe
RD&D Program Funding by DOE |  | 80.00%leu_RdDProgramFundingByDoe
RD&D Program Funding by USEC |  | 20.00%leu_RdDProgramFundingByUsec
Other advanced technology costs | $ 1.8 us-gaap_OtherResearchAndDevelopmentExpense |

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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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Namespace Prefix: | us-gaap_
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