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Earnings Per Share - Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation (Detail) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic earnings (loss) per common share computation:        
Net income (loss) attributable to Unisys Corporation $ 3,800,000 $ (42,000,000) $ 44,400,000 $ (74,700,000)
Weighted average shares (in shares) 50,986 50,437 50,867 50,346
Basic earnings (loss) per common share (in dollars per share) $ 0.07 $ (0.83) $ 0.87 $ (1.48)
Diluted earnings (loss) per common share computation:        
Net income (loss) attributable to Unisys Corporation $ 3,800,000 $ (42,000,000) $ 44,400,000 $ (74,700,000)
Add interest expense on convertible senior notes, net of tax of zero 0 0 9,700,000 0
Interest expense on convertible senior notes, tax 0 0 0 0
Net income (loss) attributable to Unisys Corporation for diluted earnings per share $ 3,800,000 $ (42,000,000) $ 54,100,000 $ (74,700,000)
Weighted average shares (in shares) 50,986 50,437 50,867 50,346
Plus incremental shares from assumed conversions:        
Employee stock plans (in shares) 412 0 370 0
Convertible senior notes (in shares) 0 0 21,868 0
Adjusted weighted average shares (in shares) 51,398 50,437 73,105 50,346
Diluted earnings (loss) per common share (in dollars per share) $ 0.07 $ (0.83) $ 0.74 $ (1.48)
Stock options and restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive weighted average securities (in shares) 1,430 2,242 1,562 3,517
Common shares issuable upon conversion of the 5.50% convertible senior notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive weighted average securities (in shares) 21,868 21,868 0 21,868
Convertible senior notes interest rate 5.50%   5.50%