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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 |  |  |  | 6.30 us-gaap_ForeignCurrencyExchangeRateTranslation1 | 4.30 us-gaap_ForeignCurrencyExchangeRateTranslation1
Foreign exchange loss | $ 7.4 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | $ 6.5 us-gaap_ForeignCurrencyTransactionGainLossUnrealized |  |  |
Gain (loss) recognized on foreign exchange | (7.0)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 10.4 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | (8.1)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  |
Venezuelan Subsidiary |  |  |  |  |
Foreign Currency Translation [Line Items] |  |  |  |  |
Foreign currency exchange rate | 12.0 us-gaap_ForeignCurrencyExchangeRateTranslation1 / dei_LegalEntityAxis = uis_VenezuelanSubsidiaryMember |  |  |  |
Asset, Reporting Currency Denominated, Value | $ 8 us-gaap_AssetReportingCurrencyDenominatedValue / dei_LegalEntityAxis = uis_VenezuelanSubsidiaryMember |  |  |  |

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- Definition The reporting currency-denominated asset value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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