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Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Long-term debt $ 244.0us-gaap_LongTermDebt $ 240.4us-gaap_LongTermDebt  
Paid-in-Kind Interest 3.6us-gaap_PaidInKindInterest    
Interest Paid 6.0us-gaap_InterestPaid    
PIK toggle notes [Member]      
Long-term debt $ 244.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= leu_PIKtogglenotesMember
  $ 240.4us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= leu_PIKtogglenotesMember
Debt instrument interest rate 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= leu_PIKtogglenotesMember
   
Debt Interest Rate, PIK 3.00%leu_DebtInterestRatePIK
/ us-gaap_DebtInstrumentAxis
= leu_PIKtogglenotesMember
   
Maximum [Member] | PIK toggle notes [Member]      
Debt Interest Rate, PIK 5.50%leu_DebtInterestRatePIK
/ us-gaap_DebtInstrumentAxis
= leu_PIKtogglenotesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember