Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Document Fiscal Year Focus Document Fiscal Year Focus Performance obligations expected recognition period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Adjustment to Compensation, Amount Adjustment to Compensation Amount Restricted Stock and RSU Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Segment Reporting [Abstract] Segment Reporting [Abstract] Marketable software, net Capitalized Cost, Software to be Sold, Leased, or Marketed, after Accumulated Amortization Schedule of Future Amortization of Intangible Assets Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block] Common stock; Issued: September 30, 2026 - 80.2 shares and December 31, 2025 - 78.1 shares Common Stock, Value, Issued Schedule of Interest Expense Schedule of Long-Term Debt Instruments [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Pension and Postretirement Benefits Retirement Benefits [Text Block] Restatement Determination Date Restatement Determination Date Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Total Long-Term Debt and Lease Obligation, Including Current Maturities Derivative Instrument [Axis] Derivative Instrument [Axis] Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Technology Developed Technology Rights [Member] Other comprehensive income Other Comprehensive Income (Loss), Net of Tax [Abstract] 10.625% senior secured notes due January 15, 2031 Senior Secured Notes Due 2031 2031 Notes Senior Secured Notes Due 2031 [Member] Senior Secured Notes Due 2031 Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province Costs to fulfill a contract, net Costs To Fulfill Contract [Member] Costs To Fulfill Contract PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation Translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Reclassification out of Accumulated Other Comprehensive Loss Reclassification out of Accumulated Other Comprehensive Income [Member] Outstanding at beginning of period (in shares) Outstanding at end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Contract assets Contract assets - current Contract with Customer, Asset, after Allowance for Credit Loss, Current Accumulated Impairment Losses Goodwill, Impaired, Accumulated Impairment Loss Retirement Benefits [Abstract] Retirement Benefits [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total current liabilities Liabilities, Current Customer Relationships Customer relationships Customer Relationships [Member] Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Entity Address, City or Town Entity Address, City or Town Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Settlement losses Accumulated Defined Benefit Plans Adjustment, Net Settlement Gain (Loss) Attributable To Parent [Member] Accumulated Defined Benefit Plans Adjustment, Net Settlement Gain (Loss) Attributable To Parent International Plans Foreign Plan [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Intangible assets, net Total Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Total other comprehensive income Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] U.S. Plans United States UNITED STATES Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Lease abandonment and other costs Gain (Loss) on Contract Termination Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Operations by Business Segment Segment Reporting [Table Text Block] Non-controlling Interests Noncontrolling Interest [Member] Domestic Plans Domestic Plan [Member] Amortization of issuance costs Amortization of Debt Issuance Costs Use of Estimates Use of Estimates, Policy [Policy Text Block] Postretirement adjustments tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Properties Property, Plant, and Equipment [Text Block] Document Period End Date Document Period End Date Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used for investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Face value Aggregate principal amount Debt Instrument, Face Amount Costs and expenses Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Schedule of Reconciliation of Revenue from Segments to Consolidated Segment Reporting, Reconciliation of Revenue by Segment to Consolidated [Table Text Block] Treasury stock, shares at cost; September 30, 2026 - 7.3 shares and December 31, 2025 - 6.7 shares Treasury Stock, Common, Value Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Cash contributions, pension plans Payment for Pension Benefits Schedule of Components of Properties, Net Property, Plant, and Equipment [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Marketing Trademarks and Trade Names [Member] Loss Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss per share attributable to Unisys Corporation Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Capital additions of properties and other assets Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Expected future utilization on balance at September 30, 2026: Restructuring and Related Cost, Expected Cost [Abstract] Company Selected Measure Name Company Selected Measure Name Schedule of Restricted Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Pension and postretirement expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Pension and Postretirement Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Long-term debt, carrying value Senior secured notes Long-Term Debt, Gross Credit Facility [Domain] Credit Facility [Domain] Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Depreciation and amortization of capitalized contract costs Capitalized Contract Cost, Amortization Individual: Individual [Axis] Adjusted weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Long-term pension and postretirement liabilities Liability, Defined Benefit Plan, Noncurrent Underlying Security Market Price Change Underlying Security Market Price Change, Percent ECS ClearPath Forward Segment [Member] ClearPath Forward Segment DWS Digital Workspace Services Segment [Member] Digital Workspace Services Segment Changes in estimates Restructuring Reserve, Accrual Adjustment Environmental recoveries receivable Recorded Third-Party Environmental Recoveries Receivable Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Gross profit Total gross profit Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Treasury Stock At Cost Treasury Stock, Common [Member] Penalties and interest accrued Income Tax Examination, Penalties and Interest Accrued Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Letters of credit outstanding Letters of Credit Outstanding, Amount Total workforce reductions Severance Costs Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Accumulated Impairment Losses Intangible Assets, Finite-Lived, Impaired, Accumulated Impairment Loss Intangible Assets, Finite-Lived, Impaired, Accumulated Impairment Loss Notional amount of foreign exchange forward contracts not designated as hedging instruments Derivative Asset, Notional Amount Plus incremental shares from assumed vesting of employee stock plans (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Stock-based activity Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture Outstanding at beginning of period (in dollars per share) Outstanding at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Long-term debt, fair value Long-Term Debt, Fair Value Schedule of Components of Net Periodic Benefit Expense Schedule of Net Benefit Costs [Table Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Schedule of Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Schedule of Capitalized Contract Costs Assets, Net Capitalized Contract Cost [Table Text Block] Current maturities of long-term debt Less – current maturities Long-Term Debt and Lease Obligation, Current Segment Information Segment Reporting [Text Block] Borrowings outstanding Long-Term Line of Credit Minimum Minimum [Member] Expiration Date Trading Arrangement Expiration Date Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash contributions, postretirement benefits Payment for Other Postretirement Benefits Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total deficit Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Buildings Building [Member] Loss contingency, estimate of possible loss Loss Contingency, Estimate of Possible Loss Net periodic postretirement benefit expense Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Derivative [Table] Derivative [Table] Other Income and Expenses [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other (expense), net Other Nonoperating Income and Expense [Text Block] Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Total unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Schedule of Amounts Reclassified Out of Accumulated Other Comprehensive Loss Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] 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] Segments [Domain] Segments [Domain] Number of shares which will vest after achievement of goals (in shares) Share Based Compensation Arrangement By Share Based Payment Award Number of Shares Vesting After Achievement of Goals Share Based Compensation Arrangement By Share Based Payment Award Number of Shares Vesting After Achievement of Goals Payments of long-term debt Payment of aggregate principal amount Repayments of Long-Term Debt Contract assets - long-term Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Unamortized issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Schedule of Statement of Income Classifications for Charges (Credits) Restructuring and Related Costs [Table Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Balance at beginning of period Balance at end of period Restructuring Reserve Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Costs and expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date Site Contingency [Table] Site Contingency [Table] Schedule of Other (Expense), Net Schedule of Other Nonoperating Income (Expense) [Table Text Block] Interest rate (in percent) Convertible senior notes interest rate Debt Instrument, Interest Rate, Stated Percentage Total Unisys Corporation stockholders' deficit Equity, Attributable to Parent Senior Secured Notes Due 2027 2027 Notes Senior Secured Notes Due 2027 [Member] Senior Secured Notes Due 2027 Write-off of unamortized debt issuance costs Deferred Debt Issuance Cost, Writeoff Settlement losses Settlement losses to defined benefit pension plans Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Restructuring Type [Axis] Restructuring Type [Axis] Prepaid pension and postretirement assets Assets for Plan Benefits, Defined Benefit Plan Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Goodwill and intangible asset impairment Goodwill and intangible asset impairment Goodwill and intangible asset impairment Intangible Asset, Including Goodwill, Impairment Loss Insider Trading Policies and Procedures [Line Items] Finance leases Finance Lease, Liability Other Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred income taxes, net Deferred Income Tax Expense (Benefit) Selling, general and administrative Selling, general and administrative expense Selling, General and Administrative Expense Current year cash contributions Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year Type of Restructuring [Domain] Type of Restructuring [Domain] Deferred commissions, net Sales Commission [Member] Sales Commission [Member] Letter of Credit Letter of Credit [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Litigation and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Anti-dilutive restricted stock units (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Carrying Value of Goodwill by Reporting Unit Goodwill [Table Text Block] Capitalized contract costs, net Total capitalized contract costs, net Capitalized Contract Cost, Net, Noncurrent Entity Central Index Key Entity Central Index Key Less-accumulated depreciation and amortization Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] Equity [Abstract] 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] Net cash used for operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Remaining performance obligation, percent to be recognized as revenue Revenue, Remaining Performance Obligation, Percentage Other comprehensive (loss) income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Deferred income taxes Deferred Income Tax Assets, Net Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Schedule of Intangible Assets, Net Intangible Asset, Finite-Lived [Table Text Block] Schedule of Revenue by Geographic Segment Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table Text Block] City Area Code City Area Code Amortization of prior service benefit Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Restricted Stock and Restricted Stock Units (RSUs) Restricted Stock and Restricted Stock Units (RSUs) [Member] Restricted Stock and Restricted Stock Units (RSUs) Accumu-lated Other Compre-hensive Loss Total AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Name Forgone Recovery, Individual Name Unrecognized compensation cost, weighted-average recognition period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted- Average Grant-Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement [Line Items] Statement [Line Items] Diluted loss per common share computation: Earnings Per Share, Diluted, Two Class Method [Abstract] Total assets Assets Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Environmental remediation estimated liability Accrual for Environmental Loss Contingencies Tax adjustments and settlements Tax Adjustments, Settlements, and Unusual Provisions Elmira Site Elmira Site [Member] Elmira Site Amortization of prior service benefit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Operating Segments Operating Segments [Member] Schedule of Restricted Stock Unit Activity Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block] Interest expense Interest expense Interest Expense, Nonoperating Schedule of Fair Values of Financial Instruments Not Measured at Fair Value in Consolidated Balance Sheets Fair Value Measurements Estimated Fair Value of Financial Instruments Not Measured at Fair Value [Table Text Block] Fair Value Measurements Estimated Fair Value Of Financial Instruments Not Measured At Fair Value [Table Text Block] Basic loss per common share computation: Earnings Per Share, Basic, Two Class Method [Abstract] Stock Compensation Share-Based Payment Arrangement [Text Block] Other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] Share-based compensation expense Share-Based Payment Arrangement, Expense Measurement Basis [Axis] Measurement Basis [Axis] Other long-term liabilities Other Liabilities, Noncurrent Goodwill Beginning balance Ending balance Goodwill Retirement Plan Type [Axis] Retirement Plan Type [Axis] Group annuity contract to transfer projected benefit obligations, purchase amount Defined Benefit Plan, Group Annuity Contract To Transfer Projected Benefit Obligations, Purchase Amount Defined Benefit Plan, Group Annuity Contract To Transfer Projected Benefit Obligations, Purchase Amount Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Revenue recognized that was included in deferred revenue at the beginning of the period Contract with Customer, Liability, Revenue Recognized Accumu-lated Deficit Retained Earnings [Member] Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Revolving Credit Facility Revolving Credit Facility [Member] Internal-use software Software, In-Development, Internally Developed, and Purchased [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Amortization of actuarial losses Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Translation Adjustments Adjustment for substantial completion of liquidation of certain foreign subsidiaries Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Issuance costs relating to long-term debt Payments of Debt Issuance Costs Diluted (in dollars per share) Diluted loss per common share (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Net cash (used for) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount David Brown [Member] David Brown Amortization of intangible assets Amortization expense Intangible Asset, Finite-Lived, Amortization Expense Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Research and development Research and development expense Research and Development Expense Adjustments to reconcile consolidated net loss to net cash used for operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Properties, net Properties, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Availability under the facility, net of letters of credit issued Line of Credit Facility, Remaining Borrowing Capacity Services Service, Other [Member] Interest cost Defined Benefit Plan, Interest Cost Schedule of Reconciliation of Liabilities and Expected Future Payments Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Less comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Fair Value Estimate of Fair Value Measurement [Member] Revenue Revenue from Contract with Customer [Text Block] Other Payment for (Proceeds from) Other Investing Activity Inventories Increase (Decrease) in Inventories Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Segment Reporting [Table] Segment Reporting [Table] Remainder of fiscal year cash contribution Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Short-term Restructuring and Related Cost, Expected Cost Remaining Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income (loss) Operating Income (Loss) Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Derivative [Line Items] Derivative [Line Items] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Amortization of marketable software Capitalized Cost, Software to be Sold, Leased, or Marketed, Amortization Expense Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Treasury stock, at cost (in shares) Treasury Stock, Common, Shares Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Debt repurchased, amount Debt Instrument, Repurchase Amount Product and Service [Domain] Product and Service [Domain] Income taxes, net of refunds Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive loss attributable to Unisys Corporation Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Pension and postretirement adjustments, net of tax of $0.2 and $5.7 in 2026 and $5.0 and $(10.7) in 2025 Pension and postretirement plans Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other accrued liabilities Other Liabilities, Current Other long-term assets Other Assets, Noncurrent Accrued interest Repayment Of Accrued Interest Repayment Of Accrued Interest Document Type Document Type Debt repurchased, face amount Debt Instrument, Repurchased Face Amount 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] (Gains) loss on debt extinguishment (Loss) gain on debt extinguishment Gain (loss) on debt extinguishment Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Proceeds from foreign exchange forward contracts Proceeds from Derivative Instrument, Investing Activities Site Contingency [Line Items] Site Contingency [Line Items] Schedule of Goodwill [Table] Goodwill [Table] Forfeited and expired (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures And Expirations In Period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures And Expirations In Period Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Long-term deferred revenue Deferred revenue - long-term Contract with Customer, Liability, Noncurrent Postretirement Benefit Plans Other Postretirement Benefits Plan [Member] Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Cash paid for debt extinguishment Payment for Debt Extinguishment or Debt Prepayment Cost Loss before income taxes Total before tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (see Note 14) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Revenue Revenues Revenues Total properties, gross Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Accounts payable and current liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Machinery and office equipment Machinery and Equipment [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Investment in marketable software Payments For Capitalized Cost, Software to be Sold, Leased, or Marketed Payments For Capitalized Cost, Software to be Sold, Leased, or Marketed Goodwill [Roll Forward] Goodwill [Roll Forward] Capitalized Contract 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[Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Goodwill impairment Impairment charges Goodwill, Impairment Loss Amended and Restated ABL Credit Facility Credit Agreement [Member] Credit Agreement [Member] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Accordion feature increase limit up to Line Of Credit Facility, Accordion Feature, Increase Limit Line Of Credit Facility, Accordion Feature, Increase Limit Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Translation adjustments Restructuring Reserve, Foreign Currency Translation Gain (Loss) Company Selected Measure Amount Company 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Determination Date [Axis] Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Premium amount Debt Instrument, Unamortized Premium Receivables, net and contract assets Increase (Decrease) In Receivables And Contract With Customer, Asset Increase (Decrease) In Receivables And Contract With Customer, Asset Interest income Investment Income, Interest Schedule of Net Contract Assets (Liabilities) Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Net loss attributable to Unisys Corporation Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Foreign currency (gains) losses Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]