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Securities Excluded from Computation of Earnings Per Share [Line Items] Pension and Postretirement Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Total liabilities and deficit Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Net loss attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Total Finite-Lived Intangible Assets, Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Treasury Stock At Cost Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation 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Statistical Measurement [Axis] 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] Reclassification out of Accumulated Other Comprehensive Loss Reclassification out of Accumulated Other Comprehensive Income [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Translation adjustments Goodwill, Foreign Currency Translation, Gain (Loss) Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Market-Based Units Market-Based Units [Member] Market-Based Units Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Schedule of Reconciliation of Segment Gross Profit to Consolidated Income (Loss) From Continuing Operations Before Income Taxes Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Current liabilities: Liabilities, Current [Abstract] Geographical [Axis] Geographical [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Borrowings outstanding Long-Term Line of Credit Foreign exchange gains Gain (Loss), Foreign Currency Transaction, before Tax Aggregate weighted-average grant-date fair value of units granted Share Based Compensation Arrangement by Share Based Payment Award Other Than Options Grants in Period, Weighted Average Grant Date Fair Value Share-based compensation arrangement by share-based payment award, other than options, grants in period, weighted average grant date fair value. Diluted (in dollars per share) Diluted loss per common share (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Title of 12(b) Security Title of 12(b) Security AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Remainder of fiscal year cash contribution Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Services Service, Other [Member] Depreciation and amortization of capitalized contract costs Capitalized Contract Cost, Amortization Treasury stock, at cost (in shares) Treasury Stock, Common, Shares Pension and postretirement expense Pension and Other Postretirement Benefits Cost (Reversal of Cost) Loss per share attributable to Unisys Corporation Earnings Per Share [Abstract] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Consolidation Items [Domain] Consolidation Items [Domain] Costs to fulfill a contract, net Costs To Fulfill Contract [Member] Costs To Fulfill Contract Gross profit Total gross profit Gross Profit Gains (losses) recognized on foreign exchange forward contracts Gain (Loss) on Fair Value Hedges Recognized in Earnings Income taxes, net of refunds Income Taxes Paid, Net 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Two Award Timing Disclosures [Line Items] Long-term debt, carrying value Senior secured notes Long-Term Debt, Gross Service cost Defined Benefit Plan, Service Cost Translation adjustments Restructuring Reserve, Foreign Currency Translation Gain (Loss) Properties Property, Plant and Equipment Disclosure [Text Block] Other comprehensive (loss) income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Schedule of Intercompany Foreign Currency Balance [Table] Intra-Entity Foreign Currency Balance [Table] Net loss attributable to Unisys Corporation Net loss attributable to Unisys Corporation Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Schedule of Amounts Reclassified Out of Accumulated Other Comprehensive Loss Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Other liabilities Increase (Decrease) in Other Operating Liabilities Deficit: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Properties, net Properties, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total Cost-reduction charges and other costs Provisions Restructuring Charges Adoption Date Trading Arrangement Adoption Date Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Entity Current Reporting Status Entity Current Reporting Status Derivative [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer relationships Customer Relationships [Member] Operating income Operating Income (Loss) Accumulated deficit Retained Earnings (Accumulated Deficit) Foreign currency translation Foreign Currency Translation Adjustment [Member] Foreign Currency Translation Adjustment [Member] Statement of Financial Position [Abstract] Statement of Financial Position [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] Executive Category: Executive Category [Axis] Foreign Exchange Forward Contract Foreign Exchange Forward [Member] Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Number Of Reportable Segments Not Disclosed Flag Current Fiscal Year End Date Current Fiscal Year End Date Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 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] Cash contributions, postretirement benefits Payment for Other Postretirement Benefits Retirement Plan Type [Axis] Retirement Plan Type [Axis] 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 [Table] Statement [Table] Other (expense), net Total other (expense), net Other (expense), net Other (expense), net Other Nonoperating Income (Expense) Deferred income taxes, net Deferred Income Tax Expense (Benefit) Adjustments to reconcile consolidated net loss to net cash (used for) provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Thereafter Finite Lived Intangible Assets, Amortization Expense, After Year Four Finite Lived Intangible Assets, Amortization Expense, After Year Four Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Site Contingency [Line Items] Site Contingency [Line Items] Anti-dilutive restricted stock units (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Purchases of foreign exchange forward contracts Payments for Derivative Instrument, Investing Activities All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Postretirement Benefit Plans Other Postretirement Benefits Plan [Member] Treasury stock, shares at cost; March 31, 2026 - 7.3 shares and December 31, 2025 - 6.7 shares Treasury Stock, Common, Value Termination Date Trading Arrangement Termination Date Net cash used for financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Changes in estimates Restructuring Reserve, Accrual Adjustment [Member] Restructuring Reserve, Accrual Adjustment [Member] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Amortization of actuarial losses Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] Schedule of Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] Segment Reporting [Abstract] Segment Reporting [Abstract] Cost of revenue Cost of Revenue Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Amortization of issuance costs Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Capitalized contract costs, net Total capitalized contract costs, net Capitalized Contract Cost, Net, Noncurrent Costs and expenses Costs and Expenses [Abstract] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock issued (in shares) Common Stock, Shares, Issued Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Schedule of Carrying Value of Goodwill by Reporting Unit Schedule of Goodwill [Table Text Block] Interest expense Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Environmental recoveries receivable Recorded Third-Party Environmental Recoveries Receivable Accounts receivable, net Accounts and Financing Receivable, after Allowance for Credit Loss, Current Foreign currency translation Translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Schedule of Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Marketable software, net Capitalized Computer Software, Net Amount related to unreserved tax-related matters, inclusive of interest Unreserved Tax Related Matters Inclusive of Interest Unreserved Tax Related Matters Inclusive of Interest Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Debt repurchased, face amount Debt Instrument, Repurchased Face Amount Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other accrued liabilities Other Liabilities, Current Marketing Trademarks and Trade Names [Member] Long-term pension and postretirement liabilities Liability, Defined Benefit Plan, Noncurrent Stock-based activity Shares Granted, Value, Share-Based Payment Arrangement, after Forfeiture Lease abandonment and other costs Gain (Loss) on Contract Termination Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Schedule of Reconciliation of Liabilities and Expected Future Payments Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Common Stock Par Value Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] (Decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation