Document and Entity Information
9 Months Ended
Sep. 30, 2019
Cover page.  
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Sep. 30, 2019
Document Transition Report false
Entity File Number 1-8729
Entity Registrant Name UNISYS CORP
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 38-0387840
Entity Address, Address Line One 801 Lakeview Drive, Suite 100
Entity Address, City or Town Blue Bell
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19422
City Area Code 215
Local Phone Number 986-4011
Title of 12(b) Security Common Stock, par value $.01
Trading Symbol UIS
Security Exchange Name NYSE
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 62,394,738
Entity Central Index Key 0000746838
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2019
Document Fiscal Period Focus Q3
Amendment Flag false