Document and Entity Information
3 Months Ended
Mar. 31, 2011
Document And Entity Information  
Document Type 10-Q
Amendment Flag false
Document Period End Date Mar. 31, 2011
Document Fiscal Year Focus 2011
Document Fiscal Period Focus Q1
Entity Registrant Name UNISYS CORP
Entity Central Index Key 0000746838
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 43,033,189