CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Consolidated net loss	$ (39.9)	$ (18.5)	$ (113.7)	$ (318.3)
Other comprehensive income (loss)
Foreign currency translation	(90.9)	(36.5)	(204.2)	(36.8)
Postretirement adjustments, net of tax of $14.4 and $35.2 in 2022 and $7.4 and $45.2 in 2021	89.1	63.4	234.8	408.6
Total other comprehensive (loss) income	(1.8)	26.9	30.6	371.8
Comprehensive (loss) income	(41.7)	8.4	(83.1)	53.5
Less comprehensive income (loss) attributable to noncontrolling interests	0.1	(0.8)	(0.5)	(0.5)
Comprehensive (loss) income attributable to Unisys Corporation	$ (41.8)	$ 9.2	$ (82.6)	$ 54.0