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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, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic Earnings (Loss) Per Share        
Net income (loss) attributable to Unisys Corporation $ 21.6 $ (58.2) $ (18.3) $ (101.4)
Weighted average shares (shares) 50,069 49,927 50,036 49,874
Total (dollars per share) $ 0.43 $ (1.17) $ (0.37) $ (2.03)
Diluted Earnings (Loss) Per Share        
Net income (loss) attributable to Unisys Corporation $ 21.6 $ (58.2) $ (18.3) $ (101.4)
Add interest expense on convertible notes, net of tax of zero 4.5 0.0 0.0 0.0
Net income (loss) attributable to Unisys Corporation for diluted earnings per share $ 26.1 $ (58.2) $ (18.3) $ (101.4)
Weighted average shares (shares) 50,069 49,927 50,036 49,874
Plus incremental shares from assumed conversions:        
Employee stock plans (shares) 167 0 0 0
Convertible notes (shares) 21,550 0 0 0
Adjusted weighted average shares (shares) 71,786 49,927 50,036 49,874
Total (dollars per share) $ 0.36 $ (1.17) $ (0.37) $ (2.03)