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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues [Abstract]
Separative work units	$ 103.6leu_SeparativeWorkUnits	$ 145.6leu_SeparativeWorkUnits
Uranium	43.2leu_Uranium	0leu_Uranium
Revenue from low enriched uranium segment	146.8leu_RevenueFromLowEnrichedUraniumSegment	145.6leu_RevenueFromLowEnrichedUraniumSegment
Contract services	21.0us-gaap_ContractsRevenue	3.0us-gaap_ContractsRevenue
Total Revenue	167.8us-gaap_Revenues	148.6us-gaap_Revenues
LEU segment gross profit	7.2leu_GrossProfitFromLowEnrichedUraniumSegment	(19.7)leu_GrossProfitFromLowEnrichedUraniumSegment
Contract services segment gross profit	(0.3)leu_ContractsGrossProfit	(1.2)leu_ContractsGrossProfit
Gross profit	$ 6.9leu_GrossProfitsAllSegments	$ (20.9)leu_GrossProfitsAllSegments

X

- Definition

Contracts Gross Profit

+ References

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- Definition

Gross Profit From Low Enriched Uranium Segment

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- Definition

Gross profits all segments

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- Definition

Revenue from low enriched uranium segment

+ References

No definition available.

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- Definition

Revenue derived from sales of the separative work unit (SWU) component of low enriched uranium (LEU).

+ References

No definition available.

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- Definition

Revenue derived from sales of uranium and the uranium component of low enriched uranium (LEU).

+ References

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- Definition

Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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