Cash and cash equivalents Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Accounts receivable, net Total 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 income Interest expense Interest expense Interest (income) Interest (income) Income before income taxes Income before income taxes Provision for income taxes Provision for income taxes Net income (loss) Net income Net income Net income per share - basic Net income 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 - (increase) decrease Accounts receivable - (increase) decrease Payables under Russian Contract - increase (decrease) Deferred revenue, net of deferred costs - increase (decrease) Accounts payable and other liabilities - increase (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 Payments for deferred financing costs and preferred stock issuance costs Common stock issued (purchased), net Net Cash (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Net Increase (Decrease) Supplemental Cash Flow Information: Interest paid, net of amount capitalized Interest paid, net of capitalized interest Supplemental Cash Flow Information: Income taxes paid Income taxes paid, net of refunds Notes To Financial Statements [Abstract] Consolidated Balance Sheets Consolidated Statements of Operations Consolidated Statements of Cash Flows ASSETS Current Assets LIABILITIES AND STOCKHOLDERS' EQUITY Current Liabilities Commitments and Contingencies (Note 11) Commitments and Contingencies (Note 18) Weighted-average number of shares outstanding: Adjustments to reconcile net income (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 Total Stockholders' Equity Balance Balance 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 - net (increase) 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 Income Taxes Income Tax Disclosure DEFERRED REVENUE AND ADVANCES FROM CUSTOMERS Convertible Preferred Stock, 75,800 shares issued OtherLongTermDebtNoncurrent SeveranceCosts Special charges Special charges DebtRelatedCommitmentFeesAndDebtIssuanceCosts Preferred stock issuance costs AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther Preferred stock issuance costs and capitalized paid-in-kind dividends ProceedsFromIssuanceOfOtherLongTermDebt Proceeds from issuance of convertible preferred stock and warrants FAIR VALUE MEASUREMENTS Facility Update [Text Block] PORTSMOUTH FACILITY UPDATE Investment By Third Party [Text Block] INVESTMENT BY TOSHIBA AND BABCOCK AND WILCOX SUBSEQUENT EVENT Inventories: Work Units Seperative Separative work units Carrying amount as of the balance sheet date of separative work unit ("SWU") inventory. SWU is held as the SWU component of low enriched uranium. A SWU is the standard measure of uranium enrichment using a standard formula derived from the physics of uranium enrichment. SWU costs are based on production costs and purchases costs. SWU inventory is valued at the lower of cost or market. Uranium Inventories Uranium Carrying amount as of the balance sheet date of uranium inventory. Uranium is held in the form of natural uranium and as the uranium component of low enriched uranium. Uranium inventory is valued at the lower of cost or market. Materials and supplies Stockholder's Equity Preferred stock, par value $1.00 per share, 25,000,000 shares authorized, no shares recorded as stockholders' equity Common stock, par value $.10 per share, 250,000,000 shares authorized, 123,320,000 shares issued Excess of capital over par value Retained earnings Treasury stock, 8,090,000 and 9,926,000 shares Accumulated other comprehensive loss, net of tax Preferred stock, par value (in dollars per share) Preferred stock, shares authorized (in shares) Preferred stock, shares issued (in shares) Preferred stock, shares outstanding (in shares) Common stock, par value (in dollars per share) Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common stock, shares outstanding (in shares) Treasury stock, shares (in shares) Proceeds from credit facility term loan Quarterly Financial Data (Unaudited) Revenue By Geographic Area Major Customers And Segment Information American Centrifuge Demobilization Charges Convertible Preferred Stock Accounts Payable and Accrued Liabilites Purchase of Separative Work Units Under Russian Contract Accounts Receivable and Other Current Assets Summary of Significant Accounting Policies Consolidated Statements of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Common Stock, Par Value $.10 per Share [Member] Excess of Capital over Par Value [Member] Treasury Stock [Member] Accumulated Other Comprehensive Income (Loss) [Member] Comprehensive Income (Loss) [Member] Statement [Table] Statement [Line Items] Restricted and other common stock issued, net of amortization Valuation revisions and amortizations of actuarial losses and prior service costs (credits), net of income tax Valuation revisions and amortizations of actuarial losses and prior service costs (credits), income tax Environmental Compliance Retained Earnings [Member] CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) Comprehensive income (loss) Put here and remove this xfdhxdf SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES