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Reorganization Items, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Dec. 31, 2014	Sep. 30, 2014
Reorganizations Items, Net [Abstract]
Reorganization items, professional fees	$ 1.5us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees	$ 22.3us-gaap_DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees
Reorganization items, expense of deferred financing costs		1.2us-gaap_DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts
Gain on cancellation of convertible senior notes, net		(284.7)leu_Gainoncancellationofconvertibleseniornotesnet
Gain on cancellation of convertible preferred stock, net		(64.1)leu_Gainoncancellationofconvertiblepreferredstocknet
Expense of unamortized restricted stock		0.4leu_Expenseofunamortizedrestrictedstock
Gain related to the freeze of SERP benefits		(2.2)leu_GainrelatedtothefreezeofSERPbenefits
Revaluation of deferred revenue, net of deferred costs		(20.1)leu_Revaluationofdeferredrevenuenetofdeferredcosts
Revaluation of inventory		(35.4)leu_Revaluationofinventory
Valuation of intangible assets		(260.7)leu_Valuationofintangibleassets
Remeasurement of pension and postretirement benefit obligations		94.7leu_Remeasurementofpensionandpostretirementbenefitobligations
Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations		121.7leu_EliminationofPredecessorCompanyaccumulatedothercomprehensivelossrelatedtopensionandpostretirementbenefitobligations
Reorganization items, net	1.5us-gaap_ReorganizationItems	(426.9)us-gaap_ReorganizationItems
Reorganization items, net, paid	8.2leu_ReorganizationItemsNetPaid	15.6leu_ReorganizationItemsNetPaid
Accrued professional fees, current		$ 6.7us-gaap_AccruedProfessionalFeesCurrent

X

- Definition

Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations

+ References

No definition available.

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- Definition

Expense of unamortized restricted stock

+ References

No definition available.

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- Definition

Gain on cancellation of convertible preferred stock, net

+ References

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- Definition

Gain on cancellation of convertible senior notes, net

+ References

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- Definition

Gain related to the freeze of SERP benefits

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- Definition

Remeasurement of pension and postretirement benefit obligations

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No definition available.

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- Definition

Reorganization Items, Net, Paid

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- Definition

Revaluation of deferred revenue, net of deferred costs

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- Definition

Revaluation of inventory

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No definition available.

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- Definition

Valuation of intangible assets

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

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Amount of write-off of deferred financing costs and debt discounts related to prepetition debt obligations.

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-Publisher FASB

-Name Accounting Standards Codification

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Total amount of reorganization items.

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-Publisher FASB

-Name Accounting Standards Codification

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