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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2012
Increase (decrease) in deferred tax asset valuation allowance	$ 17.3us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	$ 77.4us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	$ 103.9us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	$ 9.1us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Deferred Tax Liabilities, Net, Current	26.0us-gaap_DeferredTaxLiabilitiesCurrent		26.0us-gaap_DeferredTaxLiabilitiesCurrent
Deferred Tax Assets, Net, Noncurrent	26.0us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent		26.0us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Deferred income taxes	(2.4)us-gaap_DeferredIncomeTaxExpenseBenefit	0us-gaap_DeferredIncomeTaxExpenseBenefit		(84.7)us-gaap_DeferredIncomeTaxExpenseBenefit
Benefit for tax basis written off related to asset retirements	22.2leu_Benefitfortaxbasiswrittenoffrelatedtoassetretirements
Provision (benefit) for income taxes	2.4us-gaap_IncomeTaxExpenseBenefit	1.0us-gaap_IncomeTaxExpenseBenefit		86.5us-gaap_IncomeTaxExpenseBenefit
Other Comprehensive Income (Loss), Tax	2.4us-gaap_OtherComprehensiveIncomeLossTax			75.0us-gaap_OtherComprehensiveIncomeLossTax
Discontinued Operation, Tax Effect of Discontinued Operation				11.0us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Liability for Uncertain Tax Positions, Noncurrent	1.3us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	1.3us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	1.3us-gaap_LiabilityForUncertainTaxPositionsNoncurrent	2.3us-gaap_LiabilityForUncertainTaxPositionsNoncurrent		3.0us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction		(0.7)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense		(0.4)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense
Income Tax Examination, Penalties and Interest Expense Reduction	(0.1)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense	(0.3)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense		(0.2)us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Income Tax Examination, Penalties and Interest Accrued	0.3us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued		0.3us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued	0.6us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued
Domestic Tax Authority [Member]
Operating Loss Carryforwards	217.1us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		217.1us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Annual limitation of NOL carryforwards and tax credits generated prior to ownership change			2.9leu_AnnuallimitationofNOLcarryforwardsandtaxcreditsgeneratedpriortoownershipchange / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Deferred income taxes	(2.4)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	0us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember		(83.0)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	17.3us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		17.3us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Annual limitation of NOL carryforwards and tax credits generated prior to ownership change			2.9leu_AnnuallimitationofNOLcarryforwardsandtaxcreditsgeneratedpriortoownershipchange / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Deferred income taxes		0us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember		(1.7)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Scenario, Forecast [Member]
Unrecognized Tax Benefits, Income Tax Penalties Expense Reduction					$ (0.3)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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