Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ (16.8)	$ 41.7
Other comprehensive income:
Foreign currency translation	(34.2)	(5.1)
Postretirement adjustments, net of tax of $(1.1) in 2019 and $1.0 in 2018	68.5	39.0
Total other comprehensive income	34.3	33.9
Comprehensive income	17.5	75.6
Less comprehensive income attributable to noncontrolling interests	0.5	2.3
Comprehensive income attributable to Unisys Corporation	$ 17.0	$ 73.3