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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic earnings (loss) per common share computation:        
Net income (loss) attributable to Unisys Corporation $ 6,100,000 $ (41,100,000) $ 50,500,000 $ (115,800,000)
Weighted average shares (in shares) 51,021 50,471 50,918 50,388
Basic earnings (loss) per common share (in dollars per share) $ 0.12 $ (0.81) $ 0.99 $ (2.30)
Diluted earnings (loss) per common share computation:        
Net income (loss) attributable to Unisys Corporation $ 6,100,000 $ (41,100,000) $ 50,500,000 $ (115,800,000)
Add interest expense on convertible senior notes, net of tax of zero 0 0 14,600,000 0
Interest expense on convertible senior notes, tax 0 0 0 0
Net income (loss) attributable to Unisys Corporation for diluted earnings per share $ 6,100,000 $ (41,100,000) $ 65,100,000 $ (115,800,000)
Weighted average shares (in shares) 51,021 50,471 50,918 50,388
Plus incremental shares from assumed conversions:        
Employee stock plans (in shares) 697 0 479 0
Convertible senior notes (in shares) 0 0 21,868 0
Adjusted weighted average shares (in shares) 51,718 50,471 73,265 50,388
Diluted earnings (loss) per common share (in dollars per share) $ 0.12 $ (0.81) $ 0.89 $ (2.30)
Stock options and restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive weighted average securities (in shares) 1,136 2,236 1,274 2,215
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%