Earnings Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic Earnings (Loss) Per Common Share
Net income (loss) attributable to Unisys Corporation common shareholders	$ (12.1)	$ 20.4	$ (65.6)	$ (13.5)
Weighted average shares	50,843	43,780	48,593	43,918
Total	$ (0.24)	$ 0.47	$ (1.35)	$ (0.31)
Diluted Earnings (Loss) Per Common Share
Net income (loss) attributable to Unisys Corporation common shareholders	(12.1)	20.4	(65.6)	(13.5)
Add preferred stock dividends	0	0	0	0
Net income (loss) attributable to Unisys Corporation for diluted earnings per share	$ (12.1)	$ 20.4	$ (65.6)	$ (13.5)
Weighted average shares	50,843	43,780	48,593	43,918
Plus incremental shares from assumed conversions
Employee stock plans		415
Preferred stock	0	0	0	0
Adjusted weighted average shares	50,843	44,195	48,593	43,918
Total	$ (0.24)	$ 0.46	$ (1.35)	$ (0.31)