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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 23 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Apr. 30, 2014
RD&D Program Funding by DOE |  |  | 80.00%leu_RdDProgramFundingByDoe
RD&D Program Funding by USEC |  |  | 20.00%leu_RdDProgramFundingByUsec
RD&D Program Qualifying Expenditures | $ 352.2 leu_RdDProgramQualifyingExpendituresToDate |  |
RD&D Program Qualifying Expenditures - DOE Share | 280 leu_RdDProgramQualifyingExpendituresToDateDoeShare |  |
RD&D Program Qualifying Expenditures – USEC Share | 72.2 leu_RDDProgramQualifyingExpendituresUSECShare |  |
Other advanced technology costs | 4.7 us-gaap_OtherResearchAndDevelopmentExpense | 12.3 us-gaap_OtherResearchAndDevelopmentExpense |
Scenario, Forecast [Member] |  |  |
Maximum RD&D Program Funding by DOE |  |  | 280 leu_MaximumRdDProgramFundingByDoe / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Scenario, Actual [Member] |  |  |
RD&D Program Funding by DOE |  |  | 79.50%leu_RdDProgramFundingByDoe / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember
RD&D Program Funding by USEC |  |  | 20.50%leu_RdDProgramFundingByUsec / us-gaap_StatementScenarioAxis = us-gaap_ScenarioActualMember

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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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