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Customer Revenue by Classes of Similar Products or Services (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue from External Customer [Line Items]
Customer revenue	$ 721.2us-gaap_Revenues	$ 761.7us-gaap_Revenues
Services
Revenue from External Customer [Line Items]
Customer revenue	639.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember	681.7us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Technology
Revenue from External Customer [Line Items]
Customer revenue	82.2us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember	80.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember
Cloud & Infrastructure Services | Services
Revenue from External Customer [Line Items]
Customer revenue	378.5us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_CloudAndInfrastructureServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember	419.4us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_CloudAndInfrastructureServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Application Services | Services
Revenue from External Customer [Line Items]
Customer revenue	202.4us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_ApplicationServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember	196.2us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_ApplicationServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Business Processing Outsourcing Services | Services
Revenue from External Customer [Line Items]
Customer revenue	$ 58.1us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_BusinessProcessOutsourcingServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember	$ 66.1us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_BusinessProcessOutsourcingServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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