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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Accrued interest payable on debt $ 3.0us-gaap_InterestPayableCurrent    
Predecessor [Member]      
Trade payables   8.7us-gaap_AccountsPayableOtherCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Compensation and benefits payable   27.3leu_CompensationAndBenefitsPayable
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Accrued lease turnover - current   30.4leu_Accruedleaseturnovercurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Accrued severance payments   21.2leu_Accruedseverancepayments
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Other accrued liabilities   26.9us-gaap_OtherAccruedLiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Accounts payable and accrued liabilities   114.5us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Successor [Member]      
Trade payables 10.4us-gaap_AccountsPayableOtherCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
   
Compensation and benefits payable 22.4leu_CompensationAndBenefitsPayable
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
   
Accrued lease turnover - current 0leu_Accruedleaseturnovercurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
   
Accrued severance payments 2.4leu_Accruedseverancepayments
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
   
Other accrued liabilities 15.3us-gaap_OtherAccruedLiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
   
Accounts payable and accrued liabilities $ 50.5us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
  $ 79.5us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember