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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Measurement Inputs, Disclosure [Line Items]
Maturity period limit of foreign currency exchange instruments (in months)	1 month
Net fair value gain (loss) on foreign exchange forward contracts	$ 4.2uis_ForeignCurrencyDerivativesIncreaseDecreaseInFairValue	$ 1.6uis_ForeignCurrencyDerivativesIncreaseDecreaseInFairValue
Difference between carrying amount and fair value of long-term debt	12us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments		9us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments
Other Income Expense Net
Fair Value, Measurement Inputs, Disclosure [Line Items]
Net gain (loss) on foreign exchange forward contracts	25.6us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet / us-gaap_IncomeStatementLocationAxis = uis_OtherIncomeExpenseNetMember	2.4us-gaap_GainLossOnForeignCurrencyDerivativesRecordedInEarningsNet / us-gaap_IncomeStatementLocationAxis = uis_OtherIncomeExpenseNetMember
Prepaid Expenses and Other Current Assets
Fair Value, Measurement Inputs, Disclosure [Line Items]
Net fair value gain (loss) on foreign exchange forward contracts	4.7uis_ForeignCurrencyDerivativesIncreaseDecreaseInFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember	1.8uis_ForeignCurrencyDerivativesIncreaseDecreaseInFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
Other Accrued Liabilities
Fair Value, Measurement Inputs, Disclosure [Line Items]
Net fair value gain (loss) on foreign exchange forward contracts	0.5uis_ForeignCurrencyDerivativesIncreaseDecreaseInFairValue / us-gaap_BalanceSheetLocationAxis = uis_OtherAccruedLiabilitiesMember	0.2uis_ForeignCurrencyDerivativesIncreaseDecreaseInFairValue / us-gaap_BalanceSheetLocationAxis = uis_OtherAccruedLiabilitiesMember
Foreign Exchange Contract
Fair Value, Measurement Inputs, Disclosure [Line Items]
Notional amount of foreign exchange forward contracts not designated as hedging instruments	$ 350.9us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember	$ 486.0us-gaap_DerivativeAssetNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember

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Foreign Currency Derivatives Increase Decrease In Fair Value

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Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959



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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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