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Segment Information - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Customer Segment	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of operating business segments	2us-gaap_NumberOfOperatingSegments
Intersegment profit	$ 154.9us-gaap_OperatingIncomeLoss	$ 219.5us-gaap_OperatingIncomeLoss	$ 319.2us-gaap_OperatingIncomeLoss
Number of Customers Accounted for more than 10% of revenue	0uis_NumberOfCustomersAccountedForMoreThanTenPercentageOfRevenue
Revenues	3,356.4us-gaap_Revenues	3,456.5us-gaap_Revenues	3,706.4us-gaap_Revenues
Various Agencies Of U.S. Government
Segment Reporting Information [Line Items]
Revenues	529.0us-gaap_Revenues / us-gaap_MajorCustomersAxis = uis_FederalGovernmentAgenciesMember	512.0us-gaap_Revenues / us-gaap_MajorCustomersAxis = uis_FederalGovernmentAgenciesMember	523.0us-gaap_Revenues / us-gaap_MajorCustomersAxis = uis_FederalGovernmentAgenciesMember
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intersegment profit	(78.7)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember	(90.1)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember	(95.1)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Other Technology | Segment Reconciling Items
Segment Reporting Information [Line Items]
Intersegment profit	$ 17.0us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_ProductOrServiceAxis = uis_OtherTechnologyMember	$ 6.0us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_ProductOrServiceAxis = uis_OtherTechnologyMember	$ 11.5us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_ProductOrServiceAxis = uis_OtherTechnologyMember

X

- Definition

Number Of Customers Accounted For More Than Ten Percentage Of Revenue

+ References

No definition available.

+ Details

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X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

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X

- 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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X

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