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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, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic earnings (loss) per common share computation:    
Net income (loss) attributable to Unisys Corporation $ 40.6 $ (32.7)
Weighted average shares (in shares) 50,748 50,256
Basic loss per common share (in dollars per share) $ 0.80 $ (0.65)
Diluted earnings (loss) per common share computation:    
Net income (loss) attributable to Unisys Corporation $ 40.6 $ (32.7)
Add interest expense on convertible senior notes, net of tax of zero 4.8 0.0
Net income (loss) attributable to Unisys Corporation for diluted earnings per share $ 45.4 $ (32.7)
Weighted average shares (in shares) 50,748 50,256
Plus incremental shares from assumed conversions:    
Employee stock plans (in shares) 327 0
Convertible senior notes (in shares) 21,868 0
Adjusted weighted average shares (in shares) 72,943 50,256
Diluted loss per common share (in dollars per share) $ 0.62 $ (0.65)
Stock options and restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive weighted average securities (in shares) 2,044 2,355
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) 0 21,868
Convertible senior notes interest rate 5.50%