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v2.4.1.9

Changes in Carrying Amount of Goodwill by Segment (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
Balance at beginning of year | $ 188.7 us-gaap_Goodwill | $ 192.3 us-gaap_Goodwill |
Translation adjustments | (4.8)us-gaap_GoodwillTranslationAdjustments | (3.6)us-gaap_GoodwillTranslationAdjustments |
Balance at end of year | 183.9 us-gaap_Goodwill | 188.7 us-gaap_Goodwill |
Services |  |  |
Goodwill [Line Items] |  |  |
Balance at beginning of year | 80.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 83.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember |
Translation adjustments | (4.8)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | (3.6)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember |
Balance at end of year | 75.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember | 80.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_ServicesMember |
Technology |  |  |
Goodwill [Line Items] |  |  |
Balance at beginning of year |  |  | 108.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember
Balance at end of year | $ 108.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | $ 108.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember | $ 108.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = uis_TechnologyMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=uis_TechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |