Cash and cash equivalents Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Accounts receivable, net Inventories DeferredTaxAssetsNetCurrent Deferred income taxes Other current assets Total Current Assets Total Current Assets Property, Plant and Equipment, net Deferred income taxes DepositsAssetsNoncurrent Deposits for surety bonds Deferred financing costs, net Goodwill Total Other Long-Term Assets Total Other Long-Term Assets Total Assets Total Assets Accounts payable and accrued liabilities Inventories owed to customers and suppliers Cost of SWU and uranium inventories owed related to the transfer of title from USEC to customer at fabricator whereby fabricator has elected to order less material from USEC than is required. Amounts owed are satisfied when fabricator orders future bulk deliveries. Deferred revenue and advances from customers Total Current Liabilities Total Current Liabilities Long-Term Debt Postretirement health and life benefit obligations Pension benefit liabilities Other liabilities Total Other Long-Term Liabilities Total Other Long-Term Liabilities Total Liabilities and Stockholders' Equity Total Liabilities and Stockholders' Equity Gross profit Gross profit Operating income Operating (loss) Interest expense Interest expense Interest (income) Interest (income) Income before income taxes (Loss) before income taxes Provision for income taxes Provision (benefit) for income taxes Net income (loss) Net (loss) Net income Net (loss) per share - basic Net (loss) per share - diluted Weighted-average number of shares outstanding: Basic Basic Weighted-average number of shares outstanding: Diluted Diluted Depreciation and amortization DeferredIncomeTaxExpenseBenefit Deferred income taxes Accounts receivable - decrease Accounts receivable - (increase) decrease Payables under Russian Contract - (decrease) Deferred revenue, net of deferred costs - increase Accounts payable and other liabilities - (decrease) Other, net Other, net Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Capital expenditures Capital expenditures Net Cash (Used in) Investing Activities Net Cash (Used in) Investing Activities Borrowings under credit facility Repayments under credit facility Repayments under credit facility Repayment and repurchases of senior notes Repayment and repurchases of senior notes Payments for deferred financing costs DONT USE Payments for deferred financing costs Common stock issued (purchased), net Net Cash (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Net (Decrease) Supplemental Cash Flow Information: Interest paid, net of amount capitalized Interest paid, net of amount capitalized Supplemental Cash Flow Information: Income taxes paid Income taxes paid, net of refunds Notes to Consolidated Condensed Financial Statements (Unaudited) [Abstract] Notes to Consolidated Condensed Financial Statements (Unaudited) Consolidated Condensed Balance Sheets (Unaudited) Consolidated Condensed Statements of Operations (Unaudited) Consolidated Condensed Statements of Cash Flows (Unaudited) ASSETS Current Assets LIABILITIES AND STOCKHOLDERS' EQUITY Current Liabilities Commitments and Contingencies (Note 11) Commitments and Contingencies (Note 12) Weighted-average number of shares outstanding: Adjustments to reconcile net (loss) to net cash provided by (used in) operating activities: Cash Flows from Operating Activities Cash Flows Used in Investing Activities Cash Flows Used in Financing Activities Supplemental Cash Flow Information: BASIS OF PRESENTATION INVENTORIES PROPERTY, PLANT AND EQUIPMENT DEBT STOCKHOLDERS' EQUITY PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS STOCK-BASED COMPENSATION NET INCOME PER SHARE COMMITMENTS AND CONTINGENCIES SEGMENT INFORMATION Stockholders' Equity Document Information [Text Block] Document Type Amendment Flag Amendment Description Document Period End Date Entity [Text Block] Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Changes in operating assets and liabilities: Selling, general and administrative Other (income) Other (income) Deferred costs associated with deferred revenue Payables under Russian Contract Total revenue Total revenue Separative work units Revenue derived from sales of the separative work unit (SWU) component of low enriched uranium (LEU). Uranium Revenue derived from sales of uranium and the uranium component of low enriched uranium (LEU). Contract services revenue Total cost of sales Separative work units and uranium Contract services cost Advanced technology costs Depleted uranium disposition Other non-cash income on release of disposal obligation Other non-cash income on release of disposal obligation Inventories - decrease Inventories - decrease Accrued depleted uranium disposition - increase (decrease) Deposits for surety bonds - net (increase) decrease Deposits for surety bonds - (increase) decrease Other Long-Term Assets Revenue: Cost of sales: Other Long-Term Liabilities DEFERRED REVENUE AND ADVANCES FROM CUSTOMERS Convertible Preferred Stock OtherLongTermDebtNoncurrent SeveranceCosts Special charge for workforce reduction Special charge for workforce reduction DebtRelatedCommitmentFeesAndDebtIssuanceCosts Preferred stock issuance costs AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther Capitalized convertible preferred stock dividends paid-in-kind ProceedsFromIssuanceOfOtherLongTermDebt Proceeds from issuance of Series B-1 convertible preferred stock and warrants FAIR VALUE MEASUREMENTS PORTSMOUTH TRANSITION OF SERVICES FacilityUpdateTextBlock PORTSMOUTH TRANSITION OF SERVICES Tax benefit related to stock-based compensation Gain on extinguishment of convertible senior notes Income Tax Disclosure Put here and remove this xfdhxdf