CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Consolidated net loss	$ (174.5)	$ (57.0)
Other comprehensive income
Foreign currency translation	24.4	(17.7)
Postretirement adjustments, net of tax of $(3.0) in 2023 and $6.7 in 2022	178.3	57.3
Total other comprehensive income	202.7	39.6
Comprehensive income (loss)	28.2	(17.4)
Less comprehensive income (loss) attributable to noncontrolling interests	0.8	(0.9)
Comprehensive income (loss) attributable to Unisys Corporation	$ 27.4	$ (16.5)