Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ (9.4)	$ 7.0	$ 3.6	$ 54.7
Other comprehensive income:
Foreign currency translation	(51.7)	(8.2)	(99.7)	(36.6)
Postretirement adjustments, net of tax of $8.8 and $11.9 in 2019 and $1.4 and $4.3 in 2018	63.4	39.1	182.3	118.0
Total other comprehensive income	11.7	30.9	82.6	81.4
Comprehensive income	2.3	37.9	86.2	136.1
Less comprehensive income attributable to noncontrolling interests	2.6	0.8	5.8	4.0
Comprehensive income (loss) attributable to Unisys Corporation	$ (0.3)	$ 37.1	$ 80.4	$ 132.1