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Advances from Customers - Current and Noncurrent Deferred Revenue and Advances from Customers - Current and Noncurrent Deferred Revenue and Advances from Customers - Current and Noncurrent Separative work units inventory Separative work units inventory 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 enrichment. SWU costs are based on production costs and purchase costs. SWU inventory is valued at the lower of cost or market. Consolidated Balance Sheet [Abstract] Consolidated Balance Sheet [Abstract] Consolidated Balance Sheet [Abstract] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Accumulated Depreciation, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Stock Issued During Period, Value, Net Stock Issued During Period, Value, Net Stock Issued During Period, Value, Net Provision for Loss on Contracts Utilized Provision for Loss on Contracts Utilized Provision for Loss on Contracts Utilized Provision for Loss on Contracts Utilized Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Common Stock, Shares Authorized Common Stock, Shares Authorized Customer C [Member] Customer C [Member] Customer C [Member] Average number of shares outstanding, diluted Average number of shares outstanding, diluted Weighted Average Number of Shares Outstanding, Diluted MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Stockholders' Equity Beginning Balance Ending Balance Equity, Attributable to Parent Uranium inventory Uranium Inventory 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. Inventory Loans, Current & Noncurrent Inventory Loans, Current & Noncurrent Inventory Loans, Current & Noncurrent Long-term SWU Loan Long-term Inventory Loans Long-term Inventory Loans Selling, general and administrative Selling, General and Administrative Expense Billed accounts receivable Billed Contracts Receivable Current debt Debt, Current Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Product [Member] Product [Member] Long-term debt Long-Term Debt Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Document Fiscal Period Focus Document Fiscal Period Focus Defined Benefit Plan, Plan Assets, Amount Defined Benefit Plan, Plan Assets, Amount All Executive Categories All Executive Categories [Member] Pension benefit liabilities Liability, Defined Benefit Pension Plan, Noncurrent Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] ASSETS Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Adjustment to Right of Use Lease due to Modification [Domain] Adjustment to Right of Use Lease due to Modification [Domain] Adjustment to Right of Use Lease due to Modification Other financial assurance [Member] Other financial assurance [Member] Other financial assurance [Member] Document Type Document Type Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Other Significant Noncash Transaction [Axis] Other Significant Noncash Transaction [Axis] Deferred revenue, net of deferred costs – increase (decrease) Increase Decrease in Deferred Revenue, Net of Deferred Costs Increase Decrease in Deferred Revenue, Net of Deferred Costs Other Foreign Other Foreign [Member] Other Foreign [Member] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Additional costs obligated to DOE Additional costs obligated to DOE Additional costs obligated to DOE Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Maximum [Member] Maximum [Member] Amortization of intangible assets Amortization of Intangible Assets Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Equity issuance costs included in accounts payable and accrued liabilities [Member] Equity issuance costs included in accounts payable and accrued liabilities [Member] Equity issuance costs included in accounts payable and accrued liabilities Separative work units net of liability Separative work units net of liability Separative work units inventory net of liability Uranium owed to customers and suppliers Uranium owed to customers and suppliers Uranium owed to customers and suppliers Current Fiscal Year End Date Current Fiscal Year End Date Statistical Measurement [Axis] Statistical Measurement [Axis] PEO Name PEO Name Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount All Award Types Award Type [Domain] Other Significant Noncash Transaction, Value of Consideration Given Other Significant Noncash Transaction, Value of Consideration Given Name Outstanding Recovery, Individual Name Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Deferred Tax Assets, Net Deferred Income Tax Assets, Net Non-PEO NEO Non-PEO NEO [Member] Average useful life of finite-lived intangible assets Finite-Lived Intangible Asset, Useful Life Excess of Capital over Par Value [Member] Additional Paid-in Capital [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Purchase Price Increase Per Share Purchase Price Increase Per Share Purchase Price Increase Per Share Income (Loss) Related To Pension Settlement Income (Loss) Related To Pension Settlement Income (Loss) Related To Pension Settlement Subsequent Event Type [Domain] Subsequent Event Type [Domain] Pension and Postretirement Health and Life Benefits Retirement Benefits [Text Block] Class of Stock [Line Items] Class of Stock [Line Items] Amortization of prior service costs (credits), net Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net income (loss) per common share - diluted Earnings Per Share, Diluted Class of Stock [Axis] Class of Stock [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Accumulated intangible asset amortization Finite-Lived Intangible Assets, Accumulated Amortization Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Uranium [Member] Uranium [Member] Uranium [Member] - Natural uranium or the uranium component of Low Enriched Uranium (LEU). Workers compensation financial assurance [Member] Workers compensation financial assurance [Member] Workers compensation financial assurance [Member] Customer [Axis] Customer [Axis] Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Provision (benefit) for income taxes Income Tax Expense (Benefit) Interest costs Defined Benefit Plan, Interest Cost Debt instrument interest rate Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Supplemental Cash Flow Information: Supplemental Cash Flow Information [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Revenue from Contract with Customer, Excluding Assessed Tax Revenue Revenue from Contract with Customer, Excluding Assessed Tax Service [Member] Service [Member] Customer B [Member] Customer B [Member] Customer B [Member] Long-term debt, interest Other Long-Term Debt Uranium inventory net of liability Uranium inventory net of liability Uranium inventory net of liability Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Operating income (loss) Operating Income (Loss) Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Separative Work Units [Member] Separative Work Units [Member] Separative Work Units (SWU) [Member] - SWU is a standard unit of measurement that represents the effort required to transform a given amount of natural uranium into two components: enriched uranium having a higher percentage of the uranium-235 isotope (“U235”) and depleted uranium having a lower percentage of U235. The SWU contained in LEU is calculated using an industry standard formula based on the physics of enrichment. The amount of enrichment deemed to be contained in LEU under this formula is commonly referred to as its SWU component and the quantity of natural uranium used in the production of LEU under this formula is referred to as its uranium component. Customer E [Member] Customer E [Member] Customer E [Member] Total Liabilities and Stockholders’ Equity (Deficit) Liabilities and Equity Government cost share portion Government cost share portion Anticipated government cost share portion of new contract Other Significant Noncash Transaction, Value of Consideration Received Other Significant Noncash Transaction, Value of Consideration Received Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Disclosure Items [Axis] Fair Value Hierarchy and NAV [Axis] Excess of capital over par value Additional Paid in Capital Total Amount Program Cost Total Amount Program Cost Total Amount Program Cost Special charges for workforce reductions Restructuring Charges Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Investment income 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Block] Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Increase Decrease in Inventories Owed to Suppliers Increase Decrease in Inventories Owed to Suppliers Increase Decrease in Inventories Owed to Suppliers Common Class B [Member] Common Class B [Member] Title Trading Arrangement, Individual Title Statement [Table] Statement [Table] Other Operating Activities, Cash Flow Statement Other reconciling adjustments, net Other reconciling adjustments, net Interest expense Interest Expense, Debt Contract Phase [Axis] Contract Phase [Axis] Contract Phase Advances from customers, noncurrent - change Increase (decrease) in Advances from customers, noncurrent Increase (decrease) in Advances from customers, noncurrent City Area Code City Area Code Deferred revenue, revenue recognized Deferred Revenue, Revenue Recognized Current Liabilities Liabilities, Current [Abstract] Segment Reporting Information, Revenue for Reportable Segment [Abstract] Segment Reporting Information, Revenue for Reportable Segment [Abstract] Fair Value Option, Disclosures Fair Value Option, Disclosures [Table Text Block] Inventories owed to customers and suppliers Inventories owed to customers and suppliers 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. Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Total current assets Assets, Current Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Senior Notes [Member] Senior Notes [Member] Preferred Stock [Member] Preferred Stock [Member] Other Significant Noncash Transaction, Name [Domain] Other Significant Noncash Transaction, Name [Domain] Document Information [Line Items] Document Information [Line Items] Property, plant and equipment included in accounts payable and accrued liabilities [Member] Property, plant and equipment included in accounts payable and accrued liabilities [Member] Property, plant and equipment included in accounts payable and accrued liabilities Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of 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[Member] Low Enriched Uranium Segment [Member] Low Enriched Uranium Segment [Member] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Cash Flows Used in Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Preferred stock Preferred Stock, Value, Issued Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Net income (loss) per common share - basic Earnings Per Share, Basic Awards Under Executive Incentive Plan Period Awards Under Executive Incentive Plan Period Awards Under Executive Incentive Plan Period HALEU Ops Contract HALEU Ops Contract [Member] HALEU Ops Contract Proceeds from the sale of common stock, net Proceeds from Issuance of Common Stock Deposits for financial assurance Deposits Assets, Noncurrent Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Cash, Cash Equivalents and Restricted Cash [Abstract] Cash, Cash Equivalents and Restricted Cash [Abstract] Cash, Cash Equivalents and Restricted Cash [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Total current liabilities Liabilities, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Weighted-average number of shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total Assets Assets Cost of sales Cost of Goods and Services Sold Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] Capital expenditures Payments to Acquire Property, Plant, and Equipment Other comprehensive income, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Other long-term liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount LEU Segment LEU Segment [Member] LEU Segment Schedule of Financial Instruments Recorded at Fair Value Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Commitments and contingencies (Note 11) Commitments and Contingencies Termination Date Trading Arrangement Termination Date Revenue Revenues Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Phase 1 Phase 1 [Member] Phase 1 Revenue from External Customers by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Entity Address, City or Town Entity Address, City or Town Provision for Loss on Contract Change Provision for Loss on Contract Change Provision for Loss on Contract Change Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Common Stock Issuance Proceeds in Accounts Receivable [Domain] Common Stock Issuance Proceeds in Accounts Receivable [Domain] Common Stock Issuance Proceeds in Accounts Receivable Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Contract Estimated Value Contract Estimated Value Contract Estimated Value Advances from customers, current Advances from customers change Advances from customers change Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Entity File Number Entity File Number Reclassification of stock-based compensation liability to equity Reclassification of stock-based compensation liability to equity Reclassification of stock-based compensation liability to equity Revenue from Contract with Customer Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Deferred Revenue, Noncurrent Deferred Revenue, Noncurrent Deferred tax assets Increase (Decrease) in Deferred Income Taxes Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Deferred revenue – change Increase (Decrease) in Deferred Revenue Insider Trading Arrangements [Line Items] Cash and Cash Equivalents Disclosure Cash and Cash Equivalents Disclosure [Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] New Amount Program Cost New Amount Program Cost New Amount Program Cost PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Other current assets Prepaid Expense and Other Assets, Current Restricted cash included in other long-term assets Restricted Cash and Cash Equivalents, Noncurrent Document Transition Report Document Transition Report Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Document Quarterly Report Document Quarterly Report Government cost share, percentage Government cost share, percentage Government cost share, percentage HALEU Demo Contract HALEU Demo Contract [Member] HALEU Demo Contract Customer [Domain] Customer [Domain] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accumulated other comprehensive income (loss), net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Accumulated Deficit [Member] Retained Earnings [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Shares withheld for employee taxes [Member] Shares withheld for employee taxes [Member] Shares withheld for employee taxes; Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Average number of shares outstanding, basic Average number of shares outstanding, basic Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Document Information [Table] Document Information [Table] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Loss Contingency, Possible Loss Not Accrued Loss Contingency, Range of Possible Loss, Portion Not Accrued Contract-Based Intangible Assets [Member] Contract-Based Intangible Assets [Member] Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Entity Filer Category Entity Filer Category Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Company Selected Measure Name Company Selected Measure Name