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v2.4.1.9

Transition Charges (Narrative)(Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Asset Retirement Charges |  |  | $ 0.2 us-gaap_ProductionRelatedImpairmentsOrCharges | $ 19.8 us-gaap_ProductionRelatedImpairmentsOrCharges |
Inventory Valuation Adjustments | 0.4 us-gaap_InventoryWriteDown | 15.2 us-gaap_InventoryWriteDown | 13.5 us-gaap_InventoryWriteDown | 40.2 us-gaap_InventoryWriteDown |
Non-production expenses | 17.6 us-gaap_OtherCostOfOperatingRevenue |  | 66.7 us-gaap_OtherCostOfOperatingRevenue | 194.2 us-gaap_OtherCostOfOperatingRevenue |
Site expenses | 17.2 us-gaap_CostOfOtherPropertyOperatingExpense |  | 51.3 us-gaap_CostOfOtherPropertyOperatingExpense | 103.0 us-gaap_CostOfOtherPropertyOperatingExpense |
Power Contract Losses |  |  |  | 11.8 us-gaap_GainLossOnSaleOfCommodityContracts |
Accelerated property, plant and equipment expenses |  |  | 1.9 leu_AcceleratedProperyPlantAndEquipmentExpenses | 39.2 leu_AcceleratedProperyPlantAndEquipmentExpenses |
Payments for one-time termination benefits | 13.4 us-gaap_PaymentsForRestructuring |  | 14.8 us-gaap_PaymentsForRestructuring | 13.9 us-gaap_PaymentsForRestructuring |
Restructuring Liability Balance | 2.4 leu_RestructuringLiabilityBalance | 22.4 leu_RestructuringLiabilityBalance | 12.1 leu_RestructuringLiabilityBalance | 22.4 leu_RestructuringLiabilityBalance | 0.1 leu_RestructuringLiabilityBalance
DOE Share of Paducah Termination Benefit Costs | (1.6)leu_DOEShareofPaducahTerminationBenefitCosts |  | (2.4)leu_DOEShareofPaducahTerminationBenefitCosts | (1.2)leu_DOEShareofPaducahTerminationBenefitCosts |
Structuring advisory costs |  |  |  | 11.0 us-gaap_OtherRestructuringCosts |
Special charges for workforce reductions and advisory costs | 2.1 us-gaap_RestructuringCharges |  | 2.1 us-gaap_RestructuringCharges | 57.2 us-gaap_RestructuringCharges |
Cash Payable [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
One-time termination benefit costs | 3.7 us-gaap_SeveranceCosts1 / us-gaap_StatementScenarioAxis = leu_CashPayableMember |  | 4.5 us-gaap_SeveranceCosts1 / us-gaap_StatementScenarioAxis = leu_CashPayableMember | 25.2 us-gaap_SeveranceCosts1 / us-gaap_StatementScenarioAxis = leu_CashPayableMember |
Noncash [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Special charges for workforce reductions and advisory costs |  |  |  | 22.2 us-gaap_RestructuringCharges / us-gaap_StatementScenarioAxis = leu_NoncashMember |
Severance [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Payments for one-time termination benefits | 13.4 us-gaap_PaymentsForRestructuring / us-gaap_StatementScenarioAxis = leu_SeveranceMember |  | 13.6 us-gaap_PaymentsForRestructuring / us-gaap_StatementScenarioAxis = leu_SeveranceMember | 4.0 us-gaap_PaymentsForRestructuring / us-gaap_StatementScenarioAxis = leu_SeveranceMember |
Restructuring Liability Balance | 2.4 leu_RestructuringLiabilityBalance / us-gaap_StatementScenarioAxis = leu_SeveranceMember | 21.2 leu_RestructuringLiabilityBalance / us-gaap_StatementScenarioAxis = leu_SeveranceMember | 12.1 leu_RestructuringLiabilityBalance / us-gaap_StatementScenarioAxis = leu_SeveranceMember | 21.2 leu_RestructuringLiabilityBalance / us-gaap_StatementScenarioAxis = leu_SeveranceMember |
Accounts Receivable, Net, Current | 4.9 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = leu_SeveranceMember |  |  |  |
Advisory Costs [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Payments for one-time termination benefits |  |  | 1.2 us-gaap_PaymentsForRestructuring / us-gaap_StatementScenarioAxis = leu_AdvisoryCostsMember | 9.9 us-gaap_PaymentsForRestructuring / us-gaap_StatementScenarioAxis = leu_AdvisoryCostsMember |
Restructuring Liability Balance |  | $ 1.2 leu_RestructuringLiabilityBalance / us-gaap_StatementScenarioAxis = leu_AdvisoryCostsMember |  | $ 1.2 leu_RestructuringLiabilityBalance / us-gaap_StatementScenarioAxis = leu_AdvisoryCostsMember |

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