Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ (38.5)	$ 25.5	$ (68.2)	$ (13.2)
Other comprehensive income
Foreign currency translation	42.7	(48.9)	73.8	(38.4)
Postretirement adjustments, net of tax of $(7.1) and $(8.1) in 2017 and $11.9 and $14.6 in 2016	(10.4)	101.4	12.0	146.9
Total other comprehensive income	32.3	52.5	85.8	108.5
Comprehensive income (loss)	(6.2)	78.0	17.6	95.3
Less comprehensive income attributable to noncontrolling interests	(3.7)	(3.1)	(6.9)	(4.3)
Comprehensive income (loss) attributable to Unisys Corporation	$ (9.9)	$ 74.9	$ 10.7	$ 91.0