Business Acquisition [Axis] Business Acquisition [Axis] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Revision of Prior Period [Axis] Revision of Prior Period [Axis] Aggregate cash payments to note holders for debt conversion Payments For Debt Conversion Payments For Debt Conversion Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Consolidated net loss Consolidated net loss Consolidated net loss Consolidated net (loss) income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Deferred income taxes Deferred Income Tax Assets, Net Carrying amount of long-term debt Senior notes Long-Term Debt, Gross Entity Address, Postal Zip Code Entity Address, Postal Zip Code Changes in estimates Restructuring Reserve, Accrual Adjustment Assets held-for-sale Assets Held-for-sale, Not Part of Disposal Group Other Other Segments [Member] Debt Instrument [Axis] Debt Instrument [Axis] Diluted loss per common share computation: Earnings Per Share, Diluted, Two Class Method [Abstract] Finance leases Finance Lease, Liability Properties Property, Plant and Equipment, Gross Schedule of Restricted Stock Unit Activity Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Current maturities of long-term-debt Less – current maturities Long-Term Debt and Lease Obligation, Current Prepaid expenses and other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Balance at beginning of period Balance at end of period Restructuring Reserve Other Income and Expenses [Abstract] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Schedule of Other (Expense) Net Schedule of Other Nonoperating Income (Expense) [Table Text Block] ECS ClearPath Forward Segment [Member] ClearPath Forward Segment Fair Value Measurement [Domain] Fair Value Measurement [Domain] Other Payments for (Proceeds from) Other Investing Activities Statistical Measurement [Domain] Statistical Measurement [Domain] Cash contributions, pension plans Payment for Pension Benefits Contractual interest coupon Interest Expense, Debt, Excluding Amortization Interest rate (in percent) Debt Instrument, Interest Rate, Stated Percentage Schedule of Revenue by Geographic Segment Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Gains and Losses Recognized on Foreign Exchange Forward Contracts Derivative Instruments, Gain (Loss) [Table Text Block] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Estimated cash contributions by the company for current fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year Paid-in capital Additional Paid in Capital, Common Stock Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Net periodic pension expense (income) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Measurement period adjustment to intangibles Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Other non-cash operating activities Other Noncash Income (Expense) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Net loss attributable to Unisys Corporation Net loss attributable to Unisys Corporation Net Income (Loss) Attributable to Parent Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Aggregate cash payment for outstanding principal Payments For Debt Conversion, Outstanding Principal Payments For Debt Conversion, Outstanding Principal Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Expected volatility (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Anti-dilutive weighted average securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Subsequent Event Type [Axis] Subsequent Event Type [Axis] Amortization of prior service benefit Defined Benefit Plan, Amortization of Prior 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[Axis] Costs to fulfill contract Capitalized Contract Cost, Net Goodwill [Line Items] Goodwill [Line Items] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Borrowings outstanding Long-Term Line of Credit Forfeited and expired (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeitures And Expirations, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Forfeitures And Expirations, Weighted Average Grant Date Fair Value Entity Address, State or Province Entity Address, State or Province Amount of aggregate default under other debt that would trigger event of default Debt Instrument, Debt Default, Triggering Event Threshold, Amount Debt Instrument, Debt Default, Triggering Event Threshold, Amount Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Award 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by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Geographical [Axis] Geographical [Axis] Measurement period adjustments to goodwill Acquisition - Measurement period adjustment (see Note 3) Goodwill, Purchase Accounting Adjustments Equity interest acquired (as percent) Business Acquisition, Percentage of Voting Interests Acquired Long-term postretirement liabilities Liability, Defined Benefit Plan, Noncurrent 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 Intercompany Foreign Currency Balance [Line Items] Intercompany Foreign Currency Balance [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value, 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Text Block] Document Period End Date Document Period End Date Schedule of Accumulated Other Comprehensive Loss Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Total assets Assets Assets Debt Disclosure [Abstract] Debt Disclosure [Abstract] Loss per share attributable to Unisys Corporation Earnings Per Share [Abstract] Earnings Per Share [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Springing maturity, period prior to any date on which domestic pension contributions in an amount in excess of threshold are required to be paid Line Of Credit Facility, Springing Maturity Date, Period Prior To Date On Which Domestic Pension Contributions In Excess Of Threshold Required To Be Paid Line Of Credit Facility, Springing Maturity Date, Period Prior To Date On Which Domestic Pension Contributions In Excess Of Threshold Required To Be Paid Antidilutive Securities [Axis] Antidilutive Securities [Axis] Aggregate weighted-average grant-date fair value of units vested Share Based Compensation Arrangement by Share Based Payment Award Other Than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based compensation arrangement by share-based payment award, other than options, vested in period, weighted average grant date fair value. 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Disclosure [Line Items] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Loss Per Share Earnings Per Share [Text Block] Interest cost Defined Benefit Plan, Interest Cost Performance-Based Units Performance Based Unit [Member] Performance Based Unit [Member] 6.875% senior secured notes due November 1, 2027 Senior Secured Notes Due 2027 2027 Notes Senior Secured Notes Due 2027 [Member] Senior Secured Notes Due 2027 CompuGain LLC CompuGain LLC [Member] CompuGain LLC Comprehensive (loss) income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Award Type [Domain] Award Type [Domain] 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] Unrecognized compensation cost, weighted-average recognition period Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Schedule of Intangible Assets, Net Schedule of Finite-Lived Intangible Assets [Table Text Block] Other comprehensive (loss) income before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Schedule of Fair Value by Balance Sheet Location Fair Value, by Balance Sheet Grouping [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Gross profit Gross Profit Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Registrant Name Entity Registrant Name Subsequent Event Subsequent Events [Text Block] Expected dividend yield (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Translation adjustments Goodwill, Foreign Currency Translation Gain (Loss) Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Translation Adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Customer Relationships Customer Relationships [Member] Entity Address, City or Town Entity Address, City or Town Pension and Postretirement Benefits Retirement Benefits [Text Block] Total deficit Beginning balance Ending balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Intersegment Intersegment Eliminations [Member] Minimum Minimum [Member] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Treasury Stock At Cost Treasury Stock, Common [Member] Pension Plans Pension Plan [Member] Financial Instruments and Fair Value Measurements Fair Value Disclosures [Text Block] Long-term operating lease liabilities Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation Trading Symbol Trading Symbol Entity File Number Entity File Number Treasury stock, at cost (in shares) Treasury Stock, Common, Shares Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four Long-term deferred revenue Deferred revenue - long-term Contract with Customer, Liability, Noncurrent Research and development Research and development expense Research and Development Expense Less comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Swiss Plans SWITZERLAND Acquisitions Business Combination Disclosure [Text Block] Total Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Error Corrections and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Subsequent Events [Abstract] Subsequent Events [Abstract] Revenue Revenues Revenues Accounts payable and current liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Income Taxes Income Tax Disclosure [Text Block] Net loss attributable to Unisys Corporation Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Credit Facility [Domain] Credit Facility [Domain] Amortization of intangible assets Amortization expense Amortization of Intangible Assets Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Schedule of Carrying Value of Goodwill by Reporting Unit Schedule of Goodwill [Table Text Block] Basic (in dollars per share) Basic loss per common share (in dollars per share) Earnings Per Share, Basic Services Service, Other [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Postretirement Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Deferred commissions Capitalized Contract Cost, Gross Capped call on conversion of notes Adjustments To Additional Paid In Capital, Capped Call On Conversion Of Convertible Securities Adjustments To Additional Paid In Capital, Capped Call On Conversion Of Convertible Securities Schedule of Restricted Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Total Unisys Corporation stockholders’ deficit Stockholders' Equity Attributable to Parent Entity Interactive Data Current Entity Interactive Data Current Deferred commissions and costs to fulfill a contract - amortization expense Capitalized Contract Cost, Amortization DWS Digital Workspace Services Segment [Member] Digital Workspace Services Segment Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Stock options and restricted stock units Stock Options And Restricted Stock Units [Member] Stock Options And Restricted Stock Units [Member] Changes in operating assets and liabilities, excluding the effect of acquisitions: Increase (Decrease) in Operating Capital [Abstract] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Accumu-lated Deficit Retained Earnings [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Other (expense), net Other Nonoperating Income (Expense) [Member] Common Stock Par Value Common Stock [Member] Current period other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Statement [Table] Statement [Table] Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Redemption price, percent of principal amount of notes redeemed (in percent) Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Document Quarterly Report Document Quarterly Report Letter of Credit Letter of Credit [Member] Current assets: Assets, Current [Abstract] Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Statistical Measurement [Axis] Statistical Measurement [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Contract assets - long-term Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Accumulated deficit Retained Earnings (Accumulated Deficit) 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 Environmental costs and other, net Other Nonoperating Income (Expense), Environmental And Other Other Nonoperating Income (Expense), Environmental And Other Settlement losses Settlement losses to 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and NAV [Axis] Selling, general and administrative Selling, general and administrative expense Selling, General and Administrative Expense Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accumu-lated Other Compre-hensive Loss Total AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Document Transition Report Document Transition Report Local Phone Number Local Phone Number 2021 Notes 2021 Notes Convertible Senior Notes Due 2021 [Member] Convertible Senior Notes Due 2021 [Member] Postretirement expense Other Postretirement Benefits Cost (Reversal of Cost) Operating (loss) income Profit included in operating income Operating Income (Loss) Inventories Increase (Decrease) in Inventories Goodwill Beginning balance Ending balance Goodwill Postretirement contributions Cash contributions, postretirement benefits Payment for Other Postretirement Benefits Adjustments to reconcile consolidated net loss to net cash (used for) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Provision for (benefit from) income taxes Income tax Income Tax Expense (Benefit) Requirement to maintain minimum fixed charge coverage ratio, availability threshold Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio, Available Borrowings Threshold Debt Instrument, Covenant, Minimum Fixed Charge Coverage Ratio, Available Borrowings Threshold Geographical [Domain] Geographical [Domain] Amortization of prior service cost Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] Accordion feature increase limit Line Of Credit Facility, 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Translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Litigation and Contingencies Commitments and Contingencies Disclosure [Text Block] Current liabilities: Liabilities, Current [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Other foreign Other International [Member] Other International [Member] Foreign Exchange Forward Contract Foreign Exchange Forward [Member] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Common stock issued (in shares) Common Stock, Shares, Issued Receivables, net and contract assets Increase (Decrease) In Receivables And 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Subsidiaries Facility Closing [Member] Amendment Flag Amendment Flag Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Face value Aggregate principal amount Debt Instrument, Face Amount Total other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Comprehensive (loss) income attributable to Unisys Corporation Comprehensive Income (Loss), Net of Tax, Attributable to Parent Springing maturity, date on which pension contributions to pension funds in the United States are required to be paid, threshold excess amount Line Of Credit Facility, Springing Maturity Date, Threshold Contributions To Domestic Pension Funds Required To Be Paid Line Of Credit Facility, Springing Maturity Date, Threshold Contributions To Domestic Pension Funds Required To Be Paid Short-term Restructuring Reserve, Current Schedule of Operations by Business Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Postretirement adjustments, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Entity Current Reporting Status Entity Current Reporting Status Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Other accrued liabilities Other Liabilities, Current Other long-term assets Other Assets, Noncurrent Payments Payments for Restructuring Depreciation and amortization of properties Depreciation, Depletion and Amortization Employee severance Work-force Reductions Employee Severance [Member] Schedule of Net Assets Acquired Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Unamortized discount and fees Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Basic loss per common share computation: Earnings Per Share, Basic, Two Class Method [Abstract] CA&I Cloud, Applications and Infrastructure Services Segment [Member] Cloud, Applications and Infrastructure Services Segment Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Properties, net Property, Plant and Equipment, Net Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] 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 Other (expense), net Other Income Expense Net [Member] Other Income Expense Net [Member] Payments of long-term debt Repayments of 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from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Performance obligations expected recognition period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Springing maturity, conditions, minimum liquidity Line Of Credit Facility, Springing Maturity Date, Conditions, Minimum Liquidity Line Of Credit Facility, Springing Maturity Date, Conditions, Minimum Liquidity Total unrecognized compensation cost Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Notional amount of foreign exchange forward contracts not designated as hedging instruments Derivative Asset, Notional Amount Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Non-cash interest expense Paid-in-Kind Interest Amortization of debt discount Amortization of Debt Discount (Premium) Other debt Other Long-Term Debt Capital additions of outsourcing assets Capital Additions of Outsourcing Assets The cash outflow associated with the acquisition of assets used to provide services to outsourcing customers. 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Dutch Plans NETHERLANDS Liabilities and deficit Liabilities and Equity [Abstract] Fair Value Estimate of Fair Value Measurement [Member] Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Investment in marketable software Payments to Acquire Intangible Assets Inventories Inventory, Net Accounts payable Accounts Payable, Current Cost-reduction charges and other costs Restructuring Charges Other assets Increase (Decrease) in Other Operating Assets Entity Filer Category Entity Filer Category Software Licenses Financing Agreement Software Licenses Financing Agreement [Member] Software Licenses Financing Agreement [Member] Weighted average shares (in shares) Weighted Average Number of Shares Outstanding, Basic Deficit: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] U.S. U.S. Plans United States UNITED STATES Share-based compensation expense Share-Based Payment Arrangement, Expense Commitments and contingencies (see Note 15) Commitments and Contingencies Security Exchange Name Security Exchange Name Weighted Average Amortization Period in Years Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Reconciliation of Revenue from Segments to Consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] Letters of credit outstanding Letters of Credit Outstanding, Amount Segment Reconciling Items Other revenue Other gross profit Segment Reconciling Items [Member] Schedule of Components of Long-term Debt Schedule of Debt [Table Text Block] Customer revenue Revenue from Contract with Customer, Excluding Assessed Tax Aggregate shares of common stock issued pursuant to 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of Error Corrections and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Purchase of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Level 2 Fair Value, Inputs, Level 2 [Member] Properties and other long-term assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Properties And Other Noncurrent Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Properties And Other Noncurrent Assets 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] Prior to November 1, 2023 (in percent) Debt Instrument, Redemption, Period One [Member] Purchases of investments Payments to Acquire Investments Current Fiscal Year End Date Current Fiscal Year End Date Foreign currency losses related to exiting foreign countries Foreign Currency Translation Adjustment [Member] Foreign Currency Translation Adjustment [Member] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Diluted (in dollars per share) Diluted loss per common share (in dollars per share) Earnings Per Share, Diluted Other (expense), net Other Nonoperating Income and Expense [Text Block] Marketing Trademarks and Trade Names [Member] Loss on disposal of capital assets Gain (Loss) on Disposition of Property Plant Equipment Stock-based activity APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Consolidation Items [Axis] Consolidation Items [Axis] Operating lease right-of-use assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Right Of Use Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Right Of Use Assets Amount of conversion, increase in outstanding common stock (in shares) Debt Instrument, Convertible, Number of Shares, New Issues Debt Instrument, Convertible, Number of Shares, New Issues Total current liabilities Liabilities, Current Other expenses Other Restructuring [Member] Schedule of Amounts Reclassified Out of Accumulated Other Comprehensive Loss Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Thereafter Finite Lived Intangible Assets, Amortization Expense, After Year Four Finite Lived Intangible Assets, Amortization Expense, After Year Four Entity Address, Address Line One Entity Address, Address Line One Cost of revenue Cost of Revenue Other Proceeds from (Payments for) Other Financing Activities Outsourcing assets, net Outsourcing Assets Net Outsourcing assets include equipment and other assets, as well as software development cost and certain cost incurred upon initiation of customer contracts related to initial customer set up costs, used to provide services to outsourcing customers. 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Long-term debt Total long-term debt Long-Term Debt and Lease Obligation Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Changes in estimates Restructuring Reserve, Accrual Adjustment [Member] Restructuring Reserve, Accrual Adjustment [Member] Schedule of Interest Expense Schedule of Long-Term Debt Instruments [Table Text Block] Equity [Abstract] Equity [Abstract] Subsequent Event [Table] Subsequent Event [Table] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Tax Identification Number Entity Tax Identification Number Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Remainder of 2022 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Contract assets Contract assets - current Contract with Customer, Asset, after Allowance for Credit Loss, Current Decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Schedule of Statement of Income Classifications for Charges (Credits) and Reconciliation of Liabilities and Expected Future Payments Restructuring and Related Costs [Table Text Block] Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] 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] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Purchase price consideration Business Combination, Consideration Transferred Marketable software, net Capitalized Computer Software, Net City Area Code City Area Code Assets Assets [Abstract] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Schedule of Intercompany Foreign Currency Balance [Table] Schedule of Intercompany Foreign Currency Balance [Table] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Change reflected Revision of Prior Period, Adjustment [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Market capitalization Market Capitalization, Amount Market Capitalization, Amount Remaining performance obligation, percent to be recognized as revenue Revenue, Remaining Performance Obligation, Percentage Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Amount related to unreserved tax-related matters, inclusive of interest (up to) Unreserved Tax Related Matters Inclusive of Interest Unreserved Tax Related Matters Inclusive of Interest Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] Employee stock compensation Share-Based Payment Arrangement, Noncash Expense Installment Payment Agreement Installment Payment Agreement [Member] Installment Payment Agreement [Member] Other long-term liabilities Other Liabilities, Noncurrent Other liabilities Increase (Decrease) in Other Operating Liabilities Capital additions of properties Payments to Acquire Property, Plant, and Equipment Accounts receivable, net Accounts and Financing Receivable, after Allowance for Credit Loss, Current Maturity period limit of foreign currency exchange instruments (in months) Derivative, Term of Contract Research and development Research and Development Expense [Member] Amount of conversion, shares received upon exercise of capped call transactions (in shares) Debt Instrument, Convertible, Number of Shares, Received Upon Exercise Of Capped Call Transactions Debt Instrument, Convertible, Number of Shares, Received Upon Exercise Of Capped Call Transactions 2023 Finite-Lived Intangible Asset, Expected Amortization, Year One Schedule of Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Cost of revenue Cost of Sales [Member] Postretirement Benefit Plans Other Postretirement Benefits Plan [Member]