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Emergence From Voluntary Reorganization Under Chapter 11 Proceedings (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Dec. 31, 2014
Class of Stock [Line Items]      
Total Stock, Shares Authorized 120,000,000leu_TotalStockSharesAuthorized 120,000,000leu_TotalStockSharesAuthorized  
Preferred Stock, Shares Authorized 20,000,000us-gaap_PreferredStockSharesAuthorized 20,000,000us-gaap_PreferredStockSharesAuthorized 20,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par or Stated Value Per Share $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare  
Common Stock, Shares, Issued 9,000,000us-gaap_CommonStockSharesIssued 9,000,000us-gaap_CommonStockSharesIssued 9,000,000us-gaap_CommonStockSharesIssued
Long-term debt $ 240,400,000us-gaap_LongTermDebt $ 240,400,000us-gaap_LongTermDebt $ 240,400,000us-gaap_LongTermDebt
Debt Instrument, Interest Rate, Stated Percentage 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage  
Convertible senior notes 530,000,000us-gaap_LongTermDebtCurrent 530,000,000us-gaap_LongTermDebtCurrent  
Convertible Noteholders, Percent of New Common Stock 79.04%leu_ConvertibleNoteholdersPercentofNewCommonStock 79.04%leu_ConvertibleNoteholdersPercentofNewCommonStock  
Interest Paid   15,900,000us-gaap_InterestPaid  
Convertible Noteholders, New Notes 200,000,000leu_ConvertibleNoteholdersNewNotes 200,000,000leu_ConvertibleNoteholdersNewNotes  
Preferred Stock, Dividend Rate, Percentage 12.75%us-gaap_PreferredStockDividendRatePercentage    
Preferred Stock, Shares Outstanding 85,903us-gaap_PreferredStockSharesOutstanding 85,903us-gaap_PreferredStockSharesOutstanding  
Convertible preferred stock (Predecessor), 85,900 shares issued 113,900,000us-gaap_OtherLongTermDebtCurrent 113,900,000us-gaap_OtherLongTermDebtCurrent  
Class of Warrant or Right, Outstanding 250,000us-gaap_ClassOfWarrantOrRightOutstanding 250,000us-gaap_ClassOfWarrantOrRightOutstanding  
Preferred Investors, Each, Percent of New Common Stock 7.98%leu_PreferredInvestorsEachPercentofNewCommonStock 7.98%leu_PreferredInvestorsEachPercentofNewCommonStock  
Preferred Investors, Aggregate, Percent of New Common Stock 15.96%leu_PreferredInvestorsAggregatePercentofNewCommonStock 15.96%leu_PreferredInvestorsAggregatePercentofNewCommonStock  
Preferred Investors, Each, New Notes 20,190,000leu_PreferredInvestorsEachNewNotes 20,190,000leu_PreferredInvestorsEachNewNotes  
Government Funding Condition for Preferred Investor Investment 1,500,000,000leu_GovernmentFundingConditionforPreferredInvestorInvestment 1,500,000,000leu_GovernmentFundingConditionforPreferredInvestorInvestment  
Preferred Investors, Aggregate, New Notes 40,380,000leu_PreferredInvestorsAggregateNewNotes 40,380,000leu_PreferredInvestorsAggregateNewNotes  
Stockholders, Percent of New Common Stock 5.00%leu_StockholdersPercentofNewCommonStock 5.00%leu_StockholdersPercentofNewCommonStock  
Secured Intercompany Financing 48,000,000leu_SecuredIntercompanyFinancing 48,000,000leu_SecuredIntercompanyFinancing  
Funds for Payments under Reorganization Plan 35,300,000leu_FundsforPaymentsunderReorganizationPlan 35,300,000leu_FundsforPaymentsunderReorganizationPlan  
Funds for Working Capital under Reorganization Plan 12,700,000leu_FundsforWorkingCapitalunderReorganizationPlan 12,700,000leu_FundsforWorkingCapitalunderReorganizationPlan  
Debtor in Possession Financing Repayments 16,300,000leu_Debtorinpossessionfinancingrepayments    
Professional Fees $ 3,100,000us-gaap_ProfessionalFees    
Common Class A [Member]      
Class of Stock [Line Items]      
Common Stock, Shares Authorized 70,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 70,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 70,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock, Par or Stated Value Per Share $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Common Stock, Shares, Issued     7,563,600us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Class B [Member]      
Class of Stock [Line Items]      
Common Stock, Shares Authorized 30,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 30,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 30,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock, Par or Stated Value Per Share $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.10us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		  
Common Stock, Shares, Issued     1,436,400us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember