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Rental expense and commitments - Additional Information (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Future minimum sublease rentals	$ 7.2
Standby letters of credit and surety bonds outstanding	318.0
Deposits and collateralized assets	$ 14.0

X

- Definition

Deposits And Collateralized Assets Amount

+ References

No definition available.

+ Details

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X

- Definition

Letters Of Credit Outstanding And Surety Bonds Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	uis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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Namespace Prefix:	us-gaap_
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X

- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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