Earnings Per Common Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic Loss Per Common Share
Net loss attributable to Unisys Corporation common shareholders	$ (53.5)	$ (33.9)
Weighted average shares	46,343	44,054
Total	$ (1.15)	$ (0.77)
Diluted Loss Per Common Share
Net loss attributable to Unisys Corporation common shareholders	(53.5)	(33.9)
Add preferred stock dividends
Net loss attributable to Unisys Corporation for diluted earnings per share	$ (53.5)	$ (33.9)
Weighted average shares	46,343	44,054
Plus incremental shares from assumed conversions
Employee stock plans
Preferred stock
Adjusted weighted average shares	46,343	44,054
Total	$ (1.15)	$ (0.77)