Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net loss from continuing operations	$ (52.7)	$ (30.1)
Income from discontinued operations, net of tax	1,068.5	13.3
Total	1,015.8	(16.8)
Other comprehensive income:
Foreign currency translation	(87.6)	(34.2)
Postretirement adjustments, net of tax of $13.9 in 2020 and $(1.1) in 2019	91.2	68.5
Total other comprehensive income	3.6	34.3
Comprehensive income	1,019.4	17.5
Less comprehensive income (loss) attributable to noncontrolling interests	(1.8)	0.5
Comprehensive income attributable to Unisys Corporation	$ 1,021.2	$ 17.0