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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Millions
Total
Predecessor [Member]
Predecessor [Member]
Common Stock Par Value $.10 per Share [Member]
Predecessor [Member]
Excess of Capital over Par Value [Member]
Predecessor [Member]
Retained Earnings (Deficit) [Member]
Predecessor [Member]
Treasury Stock [Member]
Predecessor [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Successor [Member]
Successor [Member]
Common Stock Par Value $.10 per Share [Member]
Successor [Member]
Excess of Capital over Par Value [Member]
Successor [Member]
Retained Earnings (Deficit) [Member]
Successor [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2012   $ (472.9)us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 0.5us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                 
Net income (loss)   (2.0)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                   
Ending Balance at Mar. 31, 2013                        
Beginning Balance at Dec. 31, 2012   (472.9)us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0.5us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,213.3us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,361.8)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(33.0)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(291.9)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Other comprehensive income, net of tax (Note 20)   171.8us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
        171.8us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Restricted and other common stock issued, net of amortization   1.8us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  3.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  (1.3)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Net income (loss) (158.9)us-gaap_NetIncomeLoss (158.9)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
    (158.9)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
             
Ending Balance at Dec. 31, 2013   (458.2)us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  1,216.4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,520.7)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(34.3)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(120.1)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Beginning Balance at Sep. 30, 2013                        
Net income (loss)   (71.7)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                   
Ending Balance at Dec. 31, 2013   (458.2)us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                   
Net income (loss)   (50.8)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                   
Ending Balance at Mar. 31, 2014                        
Beginning Balance at Dec. 31, 2013   (458.2)us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0.5us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,216.4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,520.7)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(34.3)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(120.1)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Other comprehensive income, net of tax (Note 20)   (1.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
        (1.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Restricted and other common stock issued, net of amortization   1.0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  1.1us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  (0.1)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Restricted Stock Award, Forfeitures   0us-gaap_RestrictedStockAwardForfeitures
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  4.4us-gaap_RestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  (4.4)us-gaap_RestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Net income (loss) 340.1us-gaap_NetIncomeLoss 340.1us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
    340.1us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
             
Elimination of Predecessor Company equity   118.7leu_EliminationofPredecessorCompanyequity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(0.5)leu_EliminationofPredecessorCompanyequity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(1,221.9)leu_EliminationofPredecessorCompanyequity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
1,180.6leu_EliminationofPredecessorCompanyequity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
38.8leu_EliminationofPredecessorCompanyequity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
121.7leu_EliminationofPredecessorCompanyequity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Issuance of Successor Company common stock and excess of capital over par value   59.3leu_IssuanceofSuccessorCompanycommonstockandexcessofcapitaloverparvalue
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0.9leu_IssuanceofSuccessorCompanycommonstockandexcessofcapitaloverparvalue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
58.4leu_IssuanceofSuccessorCompanycommonstockandexcessofcapitaloverparvalue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0leu_IssuanceofSuccessorCompanycommonstockandexcessofcapitaloverparvalue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0leu_IssuanceofSuccessorCompanycommonstockandexcessofcapitaloverparvalue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0leu_IssuanceofSuccessorCompanycommonstockandexcessofcapitaloverparvalue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Ending Balance at Sep. 30, 2014   59.3us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0.9us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
58.4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
0us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  0.9us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
     
Beginning Balance at Jun. 30, 2014                        
Net income (loss)   418.9us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
                   
Ending Balance at Sep. 30, 2014   59.3us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
          59.3us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
0.9us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
58.4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
   
Other comprehensive income, net of tax (Note 20)               4.4us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
      4.4us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Restricted and other common stock issued, net of amortization               0.2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
  0.2us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
   
Net income (loss) (42.3)us-gaap_NetIncomeLoss             (42.3)us-gaap_NetIncomeLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
    (42.3)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Ending Balance at Dec. 31, 2014               $ 21.6us-gaap_StockholdersEquity
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 0.9us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 58.6us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ (42.3)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
$ 4.4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember