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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
	Mar. 31, 2015	Mar. 31, 2014
Debt Instrument [Line Items]
Net income (loss)	$ (15.4)us-gaap_NetIncomeLoss	$ (50.8)us-gaap_NetIncomeLoss
Weighted average common shares	9.0us-gaap_WeightedAverageNumberOfSharesIssuedBasic	5.0us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Less: Weighted average unvested restricted stock		0.1us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Denominator for basic calculation	9.0us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Convertible notes		1.8us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Convertible preferred stock - equivalent common shares		17.1leu_TotalCommonSharesAttributableToConversionOfDebtSecurities
Convertible preferred stock - less: share issuance limitation		16.2leu_UnallowableCommonSharesAttributableToConversionOfDebtSecurities
Convertible preferred stock - net allowable shares		0.9us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Subtotal		2.7leu_UnadjustedWeightedAverageEffectOfDilutiveSecurities
Less: shares excluded in a period of net loss or antidilution		2.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Weighted average effect of dilutive securities		0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator for diluted calculation	9.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	4.9us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net (loss) per share - basic and diluted	$ (1.71)us-gaap_EarningsPerShareBasicAndDiluted	$ (10.37)us-gaap_EarningsPerShareBasicAndDiluted
Convertible Debt [Member]
Debt Instrument [Line Items]
Interest expense		$ 3.3us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

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Total Common Shares Attributable To Conversion Of Debt Securities

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Unadjusted weighted average effect of dilutive securities

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Unallowable Common Shares Attributable To Conversion Of Debt Securities

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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