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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 01, 2014 | Apr. 01, 2013 | Apr. 01, 2012 | Apr. 01, 2011 | Apr. 01, 2015
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Rate change in the company's income tax provision |  | $ 8.9 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate | $ 9.0 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate |  |  |  |  |
U.S. Federal tax loss carryforwards | 431.6 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |  |  |  |  |  |  |
State and local tax loss carryforwards | 204.5 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |  |  |  |  |  |  |
Foreign tax loss carryforwards | 247.2 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |  |  |  |  |  |  |
Total tax loss carryforwards | 883.3 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 888.8 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |  |  |  |
Tax credit carryforwards | 333.5 us-gaap_TaxCreditCarryforwardDeferredTaxAsset |  |  |  |  |  |  |
Cumulative undistributed earnings of foreign subsidiaries | 1,279.7 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  |  |  |  |  |  |
Cash paid, net of refunds | 73.9 us-gaap_IncomeTaxesPaidNet | 63.8 us-gaap_IncomeTaxesPaidNet | 39.9 us-gaap_IncomeTaxesPaidNet |  |  |  |  |
Penalties and interest accrued related to income tax liabilities | 1.6 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 2.1 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |  |  |  |  |  |
Utilization of tax attributes, annual limitation | 70.6 uis_TaxAttributesAnnualUtilizationLimit |  |  |  |  |  |  |
Change in deferred tax assets and related valuation allowance | 389.6 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |  |  |  |
United Kingdom |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Rate change in the company's income tax provision |  | 11.4 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_GB | 9.2 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / us-gaap_IncomeTaxAuthorityAxis = country_GB |  |  |  |  |
Corporate tax rate |  |  |  | 21.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = country_GB | 23.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = country_GB | 24.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = country_GB | 26.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = country_GB |
Tax audit for the years | 2010 |  |  |  |  |  |  |
2015 |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carryforwards, set to expire | 11.1 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndFifteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
Tax credit carryforwards, set to expire | 7.5 uis_DeferredTaxAssetsTaxCreditCarryForwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndFifteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carryforwards, set to expire | 8.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndSixteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
Tax credit carryforwards, set to expire | 10.5 uis_DeferredTaxAssetsTaxCreditCarryForwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndSixteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carryforwards, set to expire | 11.9 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndSeventeenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
Tax credit carryforwards, set to expire | 48.2 uis_DeferredTaxAssetsTaxCreditCarryForwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndSeventeenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carryforwards, set to expire | 24.6 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndEighteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
Tax credit carryforwards, set to expire | 20.8 uis_DeferredTaxAssetsTaxCreditCarryForwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndEighteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carryforwards, set to expire | 8.4 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndNineteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
Tax credit carryforwards, set to expire | 20.6 uis_DeferredTaxAssetsTaxCreditCarryForwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TwoThousandAndNineteenTaxLossCreditCarryForwardsMember |  |  |  |  |  |  |
Thereafter |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax loss carryforwards, set to expire | 818.6 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TaxCreditLossCarryForwardsThereafterMember |  |  |  |  |  |  |
Tax credit carryforwards, set to expire | $ 225.9 uis_DeferredTaxAssetsTaxCreditCarryForwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = uis_TaxCreditLossCarryForwardsThereafterMember |  |  |  |  |  |  |
India |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax audit for the years | 2006 |  |  |  |  |  |  |
Brazil |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Tax audit for the years | 2009 |  |  |  |  |  |  |
Scenario, Forecast | United Kingdom |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Corporate tax rate |  |  |  |  |  |  |  | 20.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityAxis = country_GB / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Minimum |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |
Expected change in ownership percentage | 50.00%uis_ExpectedPercentageChangeInOwnershipInterestInEntityStock / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |

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