v2.4.0.6
Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Jun. 30, 2011
Document And Entity Information [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2011  
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus FY  
Entity Registrant Name UNISYS CORP  
Entity Central Index Key 0000746838  
Current Fiscal Year End Date --12-31  
Entity Well-known Seasoned Issuer Yes  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding 43,442,193  
Entity Public Float   $ 1.1