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Net Income Per Share (Schedule of Income Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Net (loss) from continuing operations | $ (42.3)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ 340.1 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | $ (183.6)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Income from discontinued operations |  |  | 24.7 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income (loss) | (42.3)us-gaap_NetIncomeLoss | 340.1 us-gaap_NetIncomeLoss | (158.9)us-gaap_NetIncomeLoss
Net income (loss) if converted - diluted | (42.3)us-gaap_NetIncomeLossAttributableToParentDiluted | 349.1 us-gaap_NetIncomeLossAttributableToParentDiluted | (158.9)us-gaap_NetIncomeLossAttributableToParentDiluted
Weighted average common shares | 9.0 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 5.0 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 5.0 us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Less: Weighted average unvested restricted stock |  | 0.1 us-gaap_WeightedAverageNumberOfSharesRestrictedStock | 0.1 us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Denominator for basic calculation | 9.0 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4.9 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Convertible notes |  | 1.8 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities | 1.8 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Convertible preferred stock - equivalent common shares |  | 27.2 leu_TotalCommonSharesAttributableToConversionOfDebtSecurities | 10.3 leu_TotalCommonSharesAttributableToConversionOfDebtSecurities
Convertible preferred stock - less: share issuance limitation |  | 26.3 leu_UnallowableCommonSharesAttributableToConversionOfDebtSecurities | 9.4 leu_UnallowableCommonSharesAttributableToConversionOfDebtSecurities
Convertible preferred stock - net allowable shares |  | 0.9 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock | 0.9 us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Subtotal |  | 2.7 leu_UnadjustedWeightedAverageEffectOfDilutiveSecurities | 2.7 leu_UnadjustedWeightedAverageEffectOfDilutiveSecurities
Less: shares excluded in a period of net loss or antidilution |  |  | 2.7 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Weighted average effect of dilutive securities |  | 2.7 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |
Denominator for diluted calculation | 9.0 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 7.6 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 4.9 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (loss) from continuing operations - per basic share | $ (4.70)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 69.41 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (37.47)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (loss) from continuing operations - per diluted share | $ (4.70)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 45.93 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (37.47)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Income per share from discontinued operations - basic and diluted |  |  | $ 5.04 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare
Net income (loss) per basic share | $ (4.70)us-gaap_EarningsPerShareBasic | $ 69.41 us-gaap_EarningsPerShareBasic | $ (32.43)us-gaap_EarningsPerShareBasic
Net income (loss) per diluted share | $ (4.70)us-gaap_EarningsPerShareDiluted | $ 45.93 us-gaap_EarningsPerShareDiluted | $ (32.43)us-gaap_EarningsPerShareDiluted
Convertible Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense |  | $ 9.0 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember | $ 20.3 us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

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