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Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014
Long-term debt	$ 240.4us-gaap_LongTermDebt	$ 240.4us-gaap_LongTermDebt
Debt instrument interest rate		8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
Interest Payable	4.8us-gaap_InterestPayableCurrentAndNoncurrent
Interest Payable, Current	3.0us-gaap_InterestPayableCurrent
Interest Payable, Noncurrent	1.8us-gaap_AccountsPayableAndAccruedLiabilitiesNoncurrent
PIK toggle notes [Member]
Long-term debt		$ 240.4us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = leu_PIKtogglenotesMember
Debt instrument interest rate		8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = leu_PIKtogglenotesMember
Debt Interest Rate, PIK		3.00%leu_DebtInterestRatePIK / us-gaap_DebtInstrumentAxis = leu_PIKtogglenotesMember
Maximum [Member] | PIK toggle notes [Member]
Debt Interest Rate, PIK		5.50%leu_DebtInterestRatePIK / us-gaap_DebtInstrumentAxis = leu_PIKtogglenotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition

Debt Interest Rate, PIK

+ References

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- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer), including liabilities for compensation costs, fringe benefits other than pension and postretirement obligations, rent, contractual rights and obligations, and statutory obligations.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

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-Glossary Current Liabilities

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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