Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss) from continuing operations	$ (76.5)	$ 4.3	$ (129.2)	$ (25.8)
Income (loss) from discontinued operations, net of tax	(2.1)	25.5	1,066.4	38.8
Total	(78.6)	29.8	937.2	13.0
Other comprehensive income:
Foreign currency translation	6.4	(13.8)	(81.2)	(48.0)
Postretirement adjustments, net of tax of $0.4 and $14.3 in 2020 and $4.2 and $3.1 in 2019	40.0	50.4	131.2	118.9
Total other comprehensive income	46.4	36.6	50.0	70.9
Comprehensive income (loss)	(32.2)	66.4	987.2	83.9
Less comprehensive income (loss) attributable to noncontrolling interests	0.3	2.7	(1.5)	3.2
Comprehensive income (loss) attributable to Unisys Corporation	$ (32.5)	$ 63.7	$ 988.7	$ 80.7