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Advanced Technology Costs and Other Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Maximum RD&D Program Funding by DOE		$ 280leu_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	$ 1.8us-gaap_OtherResearchAndDevelopmentExpense

X

- Definition

Maximum RD&D Program Funding by DOE

+ References

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- Definition

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+ References

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- Definition

RD&D Program Funding by DOE

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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

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