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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	$ 109.1leu_RevenueUnitedStates	$ 280.3leu_RevenueUnitedStates	$ 389.4leu_RevenueUnitedStates	$ 1,024.4leu_RevenueUnitedStates
Revenue Japan	14.4leu_RevenueJapan	74.8leu_RevenueJapan	89.2leu_RevenueJapan	105.6leu_RevenueJapan
Revenue Other Countries	0.1leu_RevenueOtherCountries	35.4leu_RevenueOtherCountries	35.5leu_RevenueOtherCountries	177.5leu_RevenueOtherCountries
Revenue Foreign	14.5leu_RevenueForeign	110.2leu_RevenueForeign	124.7leu_RevenueForeign	283.1leu_RevenueForeign
Total Revenue	123.6us-gaap_Revenues	390.5us-gaap_Revenues	514.1us-gaap_Revenues	1,307.5us-gaap_Revenues
Revenues [Abstract]
Separative work units	101.0leu_SeparativeWorkUnits		448.5leu_SeparativeWorkUnits
Uranium	0.8leu_Uranium	0leu_Uranium	0.8leu_Uranium
Revenue from low enriched uranium segment	101.8leu_RevenueFromLowEnrichedUraniumSegment	347.5leu_RevenueFromLowEnrichedUraniumSegment	449.3leu_RevenueFromLowEnrichedUraniumSegment	1,294.1leu_RevenueFromLowEnrichedUraniumSegment
Contract services	21.8us-gaap_ContractsRevenue		64.8us-gaap_ContractsRevenue	13.4us-gaap_ContractsRevenue
Total Revenue	123.6us-gaap_Revenues	390.5us-gaap_Revenues	514.1us-gaap_Revenues	1,307.5us-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	1,141.2leu_LEUSegmentAssets		1,141.2leu_LEUSegmentAssets	1,646.0leu_LEUSegmentAssets
Contract Services Segment Assets	42.5leu_ContractServicesSegmentAssets		42.5leu_ContractServicesSegmentAssets	59.5leu_ContractServicesSegmentAssets
Total Assets	$ 1,183.7us-gaap_Assets		$ 1,183.7us-gaap_Assets	$ 1,705.5us-gaap_Assets

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