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Summary of Operations by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 721.2us-gaap_Revenues	$ 761.7us-gaap_Revenues
Operating income (loss)	(30.0)us-gaap_OperatingIncomeLoss	(19.9)us-gaap_OperatingIncomeLoss
Operating Segments
Segment Reporting Information [Line Items]
Revenue	721.2us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	761.7us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating income (loss)	(3.9)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember	(3.7)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Corporate
Segment Reporting Information [Line Items]
Operating income (loss)	(26.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember	(16.2)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Corporate | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	(6.7)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember	(6.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Corporate | Operating Segments
Segment Reporting Information [Line Items]
Revenue	(6.7)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember	(6.1)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember
Services
Segment Reporting Information [Line Items]
Revenue	639.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember	681.7us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Operating income (loss)	(8.5)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember	10.4us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue		0.2us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue	639.0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember	681.9us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember
Technology
Segment Reporting Information [Line Items]
Revenue	82.2us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember	80.0us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember
Operating income (loss)	4.6us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember	(14.1)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember
Technology | Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenue	6.7us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember	5.9us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember
Technology | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 88.9us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember	$ 85.9us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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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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