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Customer Revenue by Classes of Similar Products or Services (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue from External Customer [Line Items] |  |  |
Customer revenue | $ 3,356.4 us-gaap_Revenues | $ 3,456.5 us-gaap_Revenues | $ 3,706.4 us-gaap_Revenues
Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | 2,887.7 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 2,996.1 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 3,192.4 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Technology |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | 468.7 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | 460.4 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | 514.0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember
Systems Integration and Consulting | Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | 942.8 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_SystemsIntegrationAndConsultingMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 956.9 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_SystemsIntegrationAndConsultingMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 1,079.3 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_SystemsIntegrationAndConsultingMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Outsourcing | Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | 1,412.7 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_OutsourcingMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 1,428.7 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_OutsourcingMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 1,475.5 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_OutsourcingMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Infrastructure Services | Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | 347.4 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_InfrastructureServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 428.1 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_InfrastructureServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 442.4 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_InfrastructureServicesMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Core Maintenance | Services |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | 184.8 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_CoreMaintenanceMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 182.4 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_CoreMaintenanceMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 195.2 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_CoreMaintenanceMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Enterprise-Class Software And Servers | Technology |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | 429.0 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_EnterpriseClassSoftwareAndServersMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | 402.7 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_EnterpriseClassSoftwareAndServersMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | 480.3 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_EnterpriseClassSoftwareAndServersMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember
Other Technology | Technology |  |  |
Revenue from External Customer [Line Items] |  |  |
Customer revenue | $ 39.7 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_OtherTechnologyMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | $ 57.7 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_OtherTechnologyMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | $ 33.7 us-gaap_Revenues / us-gaap_ProductOrServiceAxis = uis_OtherTechnologyMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember

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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 + Details
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