CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Consolidated net loss from continuing operations	$ (104.9)	$ (449.8)	$ (317.2)
Income from discontinued operations, net of tax	0.0	0.0	1,068.4
Total	(104.9)	(449.8)	751.2
Other comprehensive income
Foreign currency translation	(117.5)	(40.5)	49.3
Postretirement adjustments, net of tax of $15.2 in 2022, $64.5 in 2021 and $(9.2) in 2020	291.7	721.8	106.9
Total other comprehensive income	174.2	681.3	156.2
Comprehensive income	69.3	231.5	907.4
Comprehensive (loss) income attributable to noncontrolling interests	(12.8)	4.6	7.6
Comprehensive income attributable to Unisys Corporation	$ 82.1	$ 226.9	$ 899.8