XML 106 R74.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Schedule of Plans' Assets (Liabilities) at Fair Value (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Other Postretirement Benefit Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | $ 9.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | $ 9.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other Postretirement Benefit Plans | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 7.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember
Other Postretirement Benefit Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | 0.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Other Postretirement Benefit Plans | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_InsuranceContractsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
Other Postretirement Benefit Plans | Exchange Traded Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ExchangeTradedFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 4,069.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember | 4,048.0 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
U.S. Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,837.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember | 1,916.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember
U.S. Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 461.6 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember | 494.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember
U.S. Plans | Debt Securities | US And UK Government Securities |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 176.9 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_UsAndUkGovernmentSecuritiesMember | 148.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_UsAndUkGovernmentSecuritiesMember
U.S. Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,025.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember | 978.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember
U.S. Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 17.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember | 79.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember
U.S. Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 34.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember | 34.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
U.S. Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 169.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember | 145.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember
U.S. Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 102.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember | 93.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember
U.S. Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 18.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember | (4.2)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember
U.S. Plans | Other | Private Equity |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 12.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember | 16.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember
U.S. Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 297.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember | 236.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
U.S. Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (1.3)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember | 5.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
U.S. Plans | Receivables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 77.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_ReceivablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember | 45.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_ReceivablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
U.S. Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (158.6)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember | (142.2)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 2,718.9 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | 2,681.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.6 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember | 1.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember
International Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,054.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember | 1,046.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember
International Plans | Debt Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 991.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember | 983.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember
International Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 330.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember | 268.9 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember
International Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 135.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember | 151.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember
International Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 40.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | 42.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember | 1.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember
International Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 136.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember | 141.0 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember
International Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember | 19.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember
International Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | 3.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 18.6 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | 22.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (0.1)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | (0.1)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember
Fair Value, Inputs, Level 1 | Other Postretirement Benefit Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | Other Postretirement Benefit Plans | Exchange Traded Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 1.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ExchangeTradedFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 2,101.0 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 2,115.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,831.6 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,916.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans | Debt Securities | US And UK Government Securities |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 176.9 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_UsAndUkGovernmentSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 148.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_UsAndUkGovernmentSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 169.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 145.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 5.9 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | (4.5)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (1.3)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 5.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans | Receivables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 77.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_ReceivablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 45.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_ReceivablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | U.S. Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (158.6)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | (142.2)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 21.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 25.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | International Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.6 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | International Plans | Real Estate | Real Estate Investments Trust |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_RealEstateInvestmentsTrustMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | International Plans | Cash |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 18.6 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 22.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 1 | International Plans | Payables |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | (0.1)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | (0.1)uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_PayablesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 | Other Postretirement Benefit Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | Other Postretirement Benefit Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,904.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,802.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | U.S. Plans | Equity Securities | Common Stock |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 5.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_CommonStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Fair Value, Inputs, Level 2 | U.S. Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 461.6 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 494.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | U.S. Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,025.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 978.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | U.S. Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 102.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 93.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | U.S. Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 12.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | U.S. Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 297.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 236.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 2,470.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 2,412.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | International Plans | Equity Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1,054.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 1,046.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | International Plans | Debt Securities | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 991.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 983.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | International Plans | Debt Securities | Other Fixed Income |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 330.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 268.9 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_FixedIncomeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | International Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 85.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 90.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | International Plans | Other | Derivative |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 19.1 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_DerivativeMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 2 | International Plans | Pooled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 1.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 3.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 | Other Postretirement Benefit Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 7.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | Other Postretirement Benefit Plans | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total |  | 7.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | Other Postretirement Benefit Plans | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 7.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_InsuranceContractsMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Fair Value, Inputs, Level 3 | U.S. Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 64.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 130.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | U.S. Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 17.4 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 79.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | U.S. Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 34.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 34.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | U.S. Plans | Other | Private Equity |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 12.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 16.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | International Plans |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 227.0 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 244.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | International Plans | Debt Securities | Insurance Contracts |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 135.5 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 151.3 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_InsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | International Plans | Real Estate |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | 40.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 42.8 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 | International Plans | Other | Commingled Funds |  |
Fair Value Hierarchy Of Plan Assets By Category [Line Items] |  |
Fair value of plan assets total | $ 50.7 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 50.2 uis_DefinedBenefitPlanFairValueOfPlanAssetsNet / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = uis_OtherMembersMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember / us-gaap_FairValueByAssetClassAxis = uis_CommingledFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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