Document and Entity Information
6 Months Ended
Jun. 30, 2019
Document And Entity Information [Abstract]  
Entity Registrant Name UNISYS CORP
Entity Central Index Key 0000746838
Current Fiscal Year End Date --12-31
Entity Filer Category Accelerated Filer
Document Type 10-Q
Document Period End Date Jun. 30, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q2
Amendment Flag false
Entity Emerging Growth Company false
Entity Small Business false
Entity Current Reporting Status Yes
Entity Shell Company false
Entity Common Stock, Shares Outstanding 51,784,433