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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Basic earnings (loss) per common share computation:        
Net loss attributable to Unisys Corporation $ (41.1) $ (28.2) $ (115.8) $ (46.5)
Weighted average shares (in shares) 50,471 50,082 50,388 50,052
Basic loss per common share (in dollars per share) $ (0.81) $ (0.56) $ (2.30) $ (0.93)
Diluted earnings (loss) per common share computation:        
Net loss attributable to Unisys Corporation for diluted earnings per share $ (41.1) $ (28.2) $ (115.8) $ (46.5)
Weighted average shares (in shares) 50,471 50,082 50,388 50,052
Diluted loss per common share (in dollars per share) $ (0.81) $ (0.56) $ (2.30) $ (0.93)
Stock options and restricted stock units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive weighted average securities (in shares) 2,236 2,238 2,215 3,637
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 21,868 15,685
Convertible senior notes interest rate 5.50%   5.50%