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Revenue, Properties and Outsourcing Assets by Geographic Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 721.2us-gaap_Revenues $ 761.7us-gaap_Revenues
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 342.0us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
311.3us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 87.9us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_GB
96.3us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_GB
Other International    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 291.3us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= uis_OtherInternationalMember
$ 354.1us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= uis_OtherInternationalMember