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Earnings Per Share - Computation of Loss Per Common Share Attributable to Unisys Corporation (Detail) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Basic earnings (loss) per common share computation:    
Net income (loss) attributable to Unisys Corporation $ (32,700,000) $ (39,900,000)
Weighted average shares (in shares) 50,256 50,004
Basic earnings (loss) per common share (in dollars per share) $ (0.65) $ (0.80)
Diluted earnings (loss) per common share computation:    
Net income (loss) attributable to Unisys Corporation $ (32,700,000) $ (39,900,000)
Add interest expense on convertible notes, net of tax of zero 0 0
Interest expense on convertible notes, tax 0 0
Net income (loss) attributable to Unisys Corporation for diluted earnings per share $ (32,700,000) $ (39,900,000)
Weighted average shares (in shares) 50,256 50,004
Plus incremental shares from assumed conversions:    
Employee stock plans (in shares) 0 0
Convertible notes (in shares) 0 0
Adjusted weighted average shares (in shares) 50,256 50,004
Diluted earnings (loss) per common share (in dollars per share) $ (0.65) $ (0.80)