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Reconciliation Of Changes In Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Unrecognized Tax Benefits [Line Items] |  |  |
Balance at January 1 | $ 26.3 us-gaap_UnrecognizedTaxBenefits | $ 29.2 us-gaap_UnrecognizedTaxBenefits | $ 24.3 us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year | 14.4 uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromCurrentPeriodTaxPositions | (2.4)uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromCurrentPeriodTaxPositions | 3.5 uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromCurrentPeriodTaxPositions
Changes for tax positions of prior years | (1.4)uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions | (0.1)uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions | 1.4 uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromPriorPeriodTaxPositions
Reductions as a result of a lapse of applicable statute of limitations | (1.6)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |  | (0.4)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Settlements | (0.9)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (0.2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (0.7)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Changes due to foreign currency | (1.8)uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromForeignCurrencyTranslation | (0.2)uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromForeignCurrencyTranslation | 1.1 uis_UnrecognizedTaxBenefitsIncreasesDecreasesResultingFromForeignCurrencyTranslation
Balance at December 31 | $ 35.0 us-gaap_UnrecognizedTaxBenefits | $ 26.3 us-gaap_UnrecognizedTaxBenefits | $ 29.2 us-gaap_UnrecognizedTaxBenefits

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- Definition Unrecognized Tax Benefits, Increases (Decreases) Resulting From Current Period Tax Positions + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Increases (Decreases) Resulting From Foreign Currency Translation + References No definition available. + Details
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- Definition Unrecognized Tax Benefits, Increases (Decreases) Resulting from Prior Period Tax Positions + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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