Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Jan. 31, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-8729
Entity Registrant Name	UNISYS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-0387840
Entity Address, Address Line One	801 Lakeview Drive
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Blue Bell
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19422
City Area Code	215
Local Phone Number	986-4011
Title of 12(b) Security	Common Stock, par value $.01
Trading Symbol	UIS
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 796.0
Entity Common Stock, Shares Outstanding		67,809,636
Documents Incorporated by Reference	Portions of Unisys Corporation’s Definitive Proxy Statement for the 2023 Annual Meeting of Stockholders are incorporated by reference into Part III hereof.
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY)	FY
Entity Central Index Key	0000746838