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Litigation and Contingencies - Additional Information (Detail)
1 Months Ended 1 Months Ended
Dec. 31, 2014
USD ($)
Apr. 30, 2007
Ministry Of Justice Of Belgium
EUR (€)
Apr. 30, 2008
Ministry Of Justice Of Belgium
EUR (€)
Dec. 31, 2014
Lufthansa AG
EUR (€)
Dec. 31, 2007
Lufthansa AG
EUR (€)
Dec. 31, 2014
Lufthansa AG
Dismissed Claims
EUR (€)
Aug. 31, 2012
Health Information Management (HIM)
USD ($)
Loss Contingencies [Line Items]              
Loss contingency, damages sought value   € 28,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_MinistryOfJusticeOfBelgiumMember
    € 21,400,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_LufthansaAgMember
€ 21,400,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= uis_DismissedClaimMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_LufthansaAgMember
$ 35,000,000us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_SaleOfAssetsMember
Counterclaim against termination of contract     18,500,000uis_ContractTerminationCounterclaimsGovernmentsOtherThanUSFederalGovernment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_MinistryOfJusticeOfBelgiumMember
  1,500,000uis_ContractTerminationCounterclaimsGovernmentsOtherThanUSFederalGovernment
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_LufthansaAgMember
1,500,000uis_ContractTerminationCounterclaimsGovernmentsOtherThanUSFederalGovernment
/ us-gaap_LitigationCaseAxis
= uis_DismissedClaimMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_LufthansaAgMember
 
Loss contingency, awarded value       2,200,000us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_LufthansaAgMember
     
Loss contingency, interest awarded       1,160,000us-gaap_LitigationSettlementInterest
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_LufthansaAgMember
     
Amount of judgment awarded to Unisys       240,000us-gaap_LitigationSettlementAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= uis_LufthansaAgMember
     
Unreserved tax-related matters, inclusive of interest $ 127,000,000uis_UnreservedTaxRelatedMattersInclusiveOfInterest