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Foreign Currency Translation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 13, 2013	Feb. 12, 2013
Foreign Currency Translation [Line Items]
Foreign currency exchange rate				6.30us-gaap_ForeignCurrencyExchangeRateTranslation1	4.30us-gaap_ForeignCurrencyExchangeRateTranslation1
Foreign exchange loss	$ 7.4us-gaap_ForeignCurrencyTransactionGainLossUnrealized	$ 6.5us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Gain (loss) recognized on foreign exchange	(7.0)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	10.4us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	(8.1)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Venezuelan Subsidiary
Foreign Currency Translation [Line Items]
Foreign currency exchange rate	12.0us-gaap_ForeignCurrencyExchangeRateTranslation1 / dei_LegalEntityAxis = uis_VenezuelanSubsidiaryMember
Asset, Reporting Currency Denominated, Value	$ 8us-gaap_AssetReportingCurrencyDenominatedValue / dei_LegalEntityAxis = uis_VenezuelanSubsidiaryMember

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The reporting currency-denominated asset value.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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-Publisher FASB

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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-Name Accounting Standards Codification

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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