CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Consolidated net loss	$ (16.8)	$ (142.3)	$ (73.8)	$ (299.8)
Other comprehensive income (loss)
Foreign currency translation	(95.6)	16.8	(113.3)	(0.3)
Postretirement adjustments, net of tax of $14.1 and $20.8 in 2022 and $34.7 and $37.8 in 2021	88.4	143.0	145.7	345.2
Total other comprehensive (loss) income	(7.2)	159.8	32.4	344.9
Comprehensive (loss) income	(24.0)	17.5	(41.4)	45.1
Less comprehensive income (loss) attributable to noncontrolling interests	0.3	(0.8)	(0.6)	0.3
Comprehensive (loss) income attributable to Unisys Corporation	$ (24.3)	$ 18.3	$ (40.8)	$ 44.8