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Segment Information (Segment Reporting Information) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Geographic Areas, Revenues from External Customers [Abstract] |  |  |  |
Revenue United States | $ 109.1 leu_RevenueUnitedStates | $ 280.3 leu_RevenueUnitedStates | $ 389.4 leu_RevenueUnitedStates | $ 1,024.4 leu_RevenueUnitedStates
Revenue Japan | 14.4 leu_RevenueJapan | 74.8 leu_RevenueJapan | 89.2 leu_RevenueJapan | 105.6 leu_RevenueJapan
Revenue Other Countries | 0.1 leu_RevenueOtherCountries | 35.4 leu_RevenueOtherCountries | 35.5 leu_RevenueOtherCountries | 177.5 leu_RevenueOtherCountries
Revenue Foreign | 14.5 leu_RevenueForeign | 110.2 leu_RevenueForeign | 124.7 leu_RevenueForeign | 283.1 leu_RevenueForeign
Total Revenue | 123.6 us-gaap_Revenues | 390.5 us-gaap_Revenues | 514.1 us-gaap_Revenues | 1,307.5 us-gaap_Revenues
Revenues [Abstract] |  |  |  |
Separative work units | 101.0 leu_SeparativeWorkUnits |  | 448.5 leu_SeparativeWorkUnits |
Uranium | 0.8 leu_Uranium | 0 leu_Uranium | 0.8 leu_Uranium |
Revenue from low enriched uranium segment | 101.8 leu_RevenueFromLowEnrichedUraniumSegment | 347.5 leu_RevenueFromLowEnrichedUraniumSegment | 449.3 leu_RevenueFromLowEnrichedUraniumSegment | 1,294.1 leu_RevenueFromLowEnrichedUraniumSegment
Contract services | 21.8 us-gaap_ContractsRevenue |  | 64.8 us-gaap_ContractsRevenue | 13.4 us-gaap_ContractsRevenue
Total Revenue | 123.6 us-gaap_Revenues | 390.5 us-gaap_Revenues | 514.1 us-gaap_Revenues | 1,307.5 us-gaap_Revenues
LEU segment gross profit | (17.8)leu_GrossProfitFromLowEnrichedUraniumSegment | (21.9)leu_GrossProfitFromLowEnrichedUraniumSegment | (39.7)leu_GrossProfitFromLowEnrichedUraniumSegment | (94.7)leu_GrossProfitFromLowEnrichedUraniumSegment
Contract services segment gross profit | (0.7)leu_ContractsGrossProfit | (0.9)leu_ContractsGrossProfit | (1.6)leu_ContractsGrossProfit | (0.2)leu_ContractsGrossProfit
Gross profit | (18.5)leu_GrossProfitsAllSegments | (22.8)leu_GrossProfitsAllSegments | (41.3)leu_GrossProfitsAllSegments | (94.9)leu_GrossProfitsAllSegments
LEU Segment Assets | 1,141.2 leu_LEUSegmentAssets |  | 1,141.2 leu_LEUSegmentAssets | 1,646.0 leu_LEUSegmentAssets
Contract Services Segment Assets | 42.5 leu_ContractServicesSegmentAssets |  | 42.5 leu_ContractServicesSegmentAssets | 59.5 leu_ContractServicesSegmentAssets
Total Assets | $ 1,183.7 us-gaap_Assets |  | $ 1,183.7 us-gaap_Assets | $ 1,705.5 us-gaap_Assets

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