1001 - Document - Cover link:presentationLink link:definitionLink link:calculationLink 1002 - Document - Audit Information link:presentationLink link:definitionLink link:calculationLink 1003 - Statement - CONSOLIDATED STATEMENTS OF INCOME (LOSS) link:presentationLink link:definitionLink link:calculationLink 1004 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) link:presentationLink link:definitionLink link:calculationLink 1005 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1006 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:definitionLink link:calculationLink 1007 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1008 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:definitionLink link:calculationLink 1009 - Statement - CONSOLIDATED STATEMENTS OF DEFICIT link:presentationLink link:definitionLink link:calculationLink 1010 - Disclosure - Summary of significant accounting policies link:presentationLink link:definitionLink link:calculationLink 1011 - Disclosure - Discontinued operations link:presentationLink link:definitionLink link:calculationLink 1012 - Disclosure - Recent accounting pronouncements and accounting changes link:presentationLink link:definitionLink link:calculationLink 1013 - Disclosure - Acquisitions link:presentationLink link:definitionLink link:calculationLink 1014 - Disclosure - Cost-reduction actions link:presentationLink link:definitionLink link:calculationLink 1015 - Disclosure - Leases and commitments link:presentationLink link:definitionLink link:calculationLink 1016 - Disclosure - Other (expense), net link:presentationLink link:definitionLink link:calculationLink 1017 - Disclosure - Income taxes link:presentationLink link:definitionLink link:calculationLink 1018 - Disclosure - Earnings (loss) per common share link:presentationLink link:definitionLink link:calculationLink 1019 - Disclosure - Accounts receivable link:presentationLink link:definitionLink link:calculationLink 1020 - Disclosure - Contract assets and deferred revenue link:presentationLink link:definitionLink link:calculationLink 1021 - Disclosure - Capitalized contract costs link:presentationLink link:definitionLink link:calculationLink 1022 - Disclosure - Financial instruments and concentration of credit risks link:presentationLink link:definitionLink link:calculationLink 1023 - Disclosure - Properties link:presentationLink link:definitionLink link:calculationLink 1024 - Disclosure - Goodwill and intangible assets link:presentationLink link:definitionLink link:calculationLink 1025 - Disclosure - Debt link:presentationLink link:definitionLink link:calculationLink 1026 - Disclosure - Other accrued liabilities link:presentationLink link:definitionLink link:calculationLink 1027 - Disclosure - Employee plans link:presentationLink link:definitionLink link:calculationLink 1028 - Disclosure - Litigation and contingencies link:presentationLink link:definitionLink link:calculationLink 1029 - Disclosure - Stockholders' equity link:presentationLink link:definitionLink link:calculationLink 1030 - Disclosure - Segment information link:presentationLink link:definitionLink link:calculationLink 1031 - Disclosure - Remaining performance obligations link:presentationLink link:definitionLink link:calculationLink 1032 - Disclosure - Schedule II - Valuation and Qualifying Accounts link:presentationLink link:definitionLink link:calculationLink 1033 - Disclosure - Summary of significant accounting policies (Policies) link:presentationLink link:definitionLink link:calculationLink 1034 - Disclosure - Summary of significant accounting policies (Tables) link:presentationLink link:definitionLink link:calculationLink 1035 - Disclosure - Discontinued operations (Tables) link:presentationLink link:definitionLink link:calculationLink 1036 - Disclosure - Acquisitions (Tables) link:presentationLink link:definitionLink link:calculationLink 1037 - Disclosure - Cost-reduction actions (Tables) link:presentationLink link:definitionLink link:calculationLink 1038 - Disclosure - Leases and commitments (Tables) link:presentationLink link:definitionLink link:calculationLink 1039 - Disclosure - Other (expense), net (Tables) link:presentationLink link:definitionLink link:calculationLink 1040 - Disclosure - Income taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 1041 - Disclosure - Earnings (loss) per common share (Tables) link:presentationLink link:definitionLink link:calculationLink 1042 - Disclosure - Contract assets and deferred revenue (Tables) link:presentationLink link:definitionLink link:calculationLink 1043 - Disclosure - Capitalized contract costs (Tables) link:presentationLink link:definitionLink link:calculationLink 1044 - Disclosure - Financial instruments and concentration of credit risks (Tables) link:presentationLink link:definitionLink link:calculationLink 1045 - Disclosure - Properties (Tables) link:presentationLink link:definitionLink link:calculationLink 1046 - Disclosure - Goodwill and intangible assets (Tables) link:presentationLink link:definitionLink link:calculationLink 1047 - Disclosure - Debt (Tables) link:presentationLink link:definitionLink link:calculationLink 1048 - Disclosure - Other accrued liabilities (Tables) link:presentationLink link:definitionLink link:calculationLink 1049 - Disclosure - Employee plans (Tables) link:presentationLink link:definitionLink link:calculationLink 1050 - Disclosure - Stockholders' equity (Tables) link:presentationLink link:definitionLink link:calculationLink 1051 - Disclosure - Segment information (Tables) link:presentationLink link:definitionLink link:calculationLink 1052 - Disclosure - Summary of significant accounting policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) link:presentationLink link:definitionLink link:calculationLink 1053 - Disclosure - Summary of significant accounting policies - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1054 - Disclosure - Discontinued operations - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1055 - Disclosure - Discontinued operations - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1056 - Disclosure - Acquisitions - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1057 - Disclosure - Acquisitions - Net Assets Acquired (Details) link:presentationLink link:definitionLink link:calculationLink 1058 - Disclosure - Acquisitions - Intangible Assets Acquired (Details) link:presentationLink link:definitionLink link:calculationLink 1059 - Disclosure - Cost-reduction actions - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1060 - Disclosure - Cost-reduction actions - Statement of Income Classifications (Details) link:presentationLink link:definitionLink link:calculationLink 1061 - Disclosure - Cost-reduction actions - Liabilities and Expected Future Payments Related to Work-Force Reduction Actions (Details) link:presentationLink link:definitionLink link:calculationLink 1062 - Disclosure - Leases and commitments - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1063 - Disclosure - Leases and commitments - Components of Lease Expense (Details) link:presentationLink link:definitionLink link:calculationLink 1064 - Disclosure - Leases and commitments - Supplemental Balance Sheet Information (Details) link:presentationLink link:definitionLink link:calculationLink 1065 - Disclosure - Leases and commitments - Supplemental Cash Flow Information (Details) link:presentationLink link:definitionLink link:calculationLink 1066 - Disclosure - Leases and commitments - Maturities of Lease Liabilities, Topic 842 (Details) link:presentationLink link:definitionLink link:calculationLink 1067 - Disclosure - Leases and commitments - Receivables Under Sales-Type Lease (Details) link:presentationLink link:definitionLink link:calculationLink 1068 - Disclosure - Other (expense), net - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1069 - Disclosure - Income taxes - Total Income (Loss) From Continuing Operations Before Income Taxes and Provision (Benefit) for Income Taxes (Details) link:presentationLink link:definitionLink link:calculationLink 1070 - Disclosure - Income taxes - Reconciliation of the Provision (Benefit) for Income Taxes (Details) link:presentationLink link:definitionLink link:calculationLink 1071 - Disclosure - Income taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) link:presentationLink link:definitionLink link:calculationLink 1072 - Disclosure - Income taxes - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1073 - Disclosure - Income taxes - Tax Loss Carryforwards (Details) link:presentationLink link:definitionLink link:calculationLink 1074 - Disclosure - Income taxes - Tax Credit Carryforwards (Details) link:presentationLink link:definitionLink link:calculationLink 1075 - Disclosure - Income taxes - Cash Paid for Income Taxes, Net of Refunds (Details) link:presentationLink link:definitionLink link:calculationLink 1076 - Disclosure - Income taxes - Reconciliation of Changes in Unrecognized Tax Benefits (Details) link:presentationLink link:definitionLink link:calculationLink 1077 - Disclosure - Earnings (loss) per common share - Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation (Details) link:presentationLink link:definitionLink link:calculationLink 1078 - Disclosure - Accounts receivable - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1079 - Disclosure - Contract assets and deferred revenue - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1080 - Disclosure - Capitalized contract costs - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1081 - Disclosure - Financial instruments and concentration of credit risks - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1082 - Disclosure - Financial instruments and concentration of credit risks - Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location (Details) link:presentationLink link:definitionLink link:calculationLink 1083 - Disclosure - Financial instruments and concentration of credit risks - Gains and Losses Recognized on Foreign Exchange Forward Contracts (Details) link:presentationLink link:definitionLink link:calculationLink 1084 - Disclosure - Properties - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1085 - Disclosure - Goodwill and intangible assets - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1086 - Disclosure - Goodwill and intangible assets - Carrying Value of Goodwill (Details) link:presentationLink link:definitionLink link:calculationLink 1087 - Disclosure - Goodwill and intangible assets - Intangible Assets, Net (Details) link:presentationLink link:definitionLink link:calculationLink 1088 - Disclosure - Goodwill and intangible assets - Schedule of Future Amortization of Intangible Assets (Details) link:presentationLink link:definitionLink link:calculationLink 1089 - Disclosure - Debt - Components of Long-term Debt (Details) link:presentationLink link:definitionLink link:calculationLink 1090 - Disclosure - Debt - Estimated Fair Values of Long-term Debt (Details) link:presentationLink link:definitionLink link:calculationLink 1091 - Disclosure - Debt - Maturities of Long-term Debt, Including Finance Leases (Details) link:presentationLink link:definitionLink link:calculationLink 1092 - Disclosure - Debt - Cash Paid for Interest and Capitalized Interest (Details) link:presentationLink link:definitionLink link:calculationLink 1093 - Disclosure - Debt - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1094 - Disclosure - Debt - Interest Expense (Details) link:presentationLink link:definitionLink link:calculationLink 1095 - Disclosure - Other accrued liabilities - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1096 - Disclosure - Employee plans - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1097 - Disclosure - Employee plans - Summary of Restricted Stock Unit Activity (Details) link:presentationLink link:definitionLink link:calculationLink 1098 - Disclosure - Employee plans - Weighted Average Assumptions for Restricted Stock Units (Details) link:presentationLink link:definitionLink link:calculationLink 1099 - Disclosure - Employee plans - Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet (Details) link:presentationLink link:definitionLink link:calculationLink 1100 - Disclosure - Employee plans - Schedule of Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) link:presentationLink link:definitionLink link:calculationLink 1101 - Disclosure - Employee plans - Components of Net Periodic Benefit Expense (Details) link:presentationLink link:definitionLink link:calculationLink 1102 - Disclosure - Employee plans - Schedule of Weighted-Average Assumptions (Details) link:presentationLink link:definitionLink link:calculationLink 1103 - Disclosure - Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) link:presentationLink link:definitionLink link:calculationLink 1104 - Disclosure - Employee plans - Expected Future Benefit Payments (Details) link:presentationLink link:definitionLink link:calculationLink 1105 - Disclosure - Employee plans - Assumed Health Care Cost Trend Rates (Details) link:presentationLink link:definitionLink link:calculationLink 1106 - Disclosure - Employee plans - Schedule of Plan Assets at Fair Value (Details) link:presentationLink link:definitionLink link:calculationLink 1107 - Disclosure - Employee plans - Summary of Changes in Level 3 Fair Value of Plan Assets (Details) link:presentationLink link:definitionLink link:calculationLink 1108 - Disclosure - Employee plans - Additional Information About Plan Assets Valued Using Net Asset Value (Details) link:presentationLink link:definitionLink link:calculationLink 1109 - Disclosure - Litigation and contingencies - Summary (Details) link:presentationLink link:definitionLink link:calculationLink 1110 - Disclosure - Stockholders' equity - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1111 - Disclosure - Stockholders' equity - Accumulated Other Comprehensive Loss (Details) link:presentationLink link:definitionLink link:calculationLink 1112 - Disclosure - Stockholders' equity - Amounts Reclassified Out of Accumulated Other Comprehensive Loss (Details) link:presentationLink link:definitionLink link:calculationLink 1113 - Disclosure - Stockholders' equity - Changes in Common Stock and Treasury Stock (Details) link:presentationLink link:definitionLink link:calculationLink 1114 - Disclosure - Segment Information - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1115 - Disclosure - Segment information - Operations by Segment (Details) link:presentationLink link:definitionLink link:calculationLink 1116 - Disclosure - Segment information - Customer Revenue by Classes of Similar Products or Services (Details) link:presentationLink link:definitionLink link:calculationLink 1117 - Disclosure - Segment information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Details) link:presentationLink link:definitionLink link:calculationLink 1118 - Disclosure - Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) link:presentationLink link:definitionLink link:calculationLink 1119 - Disclosure - Segment information - Revenue, Properties and Outsourcing Assets by Geographic Segment (Details) link:presentationLink link:definitionLink link:calculationLink 1120 - Disclosure - Remaining performance obligations - Narrative (Details) link:presentationLink link:definitionLink link:calculationLink 1121 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Details) link:presentationLink link:definitionLink link:calculationLink 1122 - Disclosure - Remaining performance obligations - Narrative (Details) Alternate link:presentationLink link:definitionLink link:calculationLink 1123 - Statement - Income taxes - Tax Loss Carryforwards (Details) Alternate 1 link:presentationLink link:definitionLink link:calculationLink