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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	$ 352.2leu_RdDProgramQualifyingExpendituresToDate
RD&D Program Qualifying Expenditures - DOE Share	280leu_RdDProgramQualifyingExpendituresToDateDoeShare
RD&D Program Qualifying Expenditures – USEC Share	72.2leu_RDDProgramQualifyingExpendituresUSECShare
Other advanced technology costs	4.7us-gaap_OtherResearchAndDevelopmentExpense	12.3us-gaap_OtherResearchAndDevelopmentExpense
Scenario, Forecast [Member]
Maximum RD&D Program Funding by DOE			280leu_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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+ 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

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