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Net Income Per Share (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2014
Debt Instrument [Line Items]
Common Stock, Shares Reserved for Future Issuance Under Management Incentive Plan			1,000,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Warrants with exercise price greater than market price	250,000leu_WarrantsWithExercisePriceGreaterThanMarketPrice	250,000leu_WarrantsWithExercisePriceGreaterThanMarketPrice
Convertible Debt [Member]
Debt Instrument [Line Items]
Interest expense	9.0us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember	20.3us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

X

- Definition

Warrants with exercise price greater than market price

+ References

No definition available.

+ Details

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Namespace Prefix:	leu_
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Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ 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 210.5-03.8)

-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 8

-Article 5

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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