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Earnings per common share - Computation of Earnings Per Common Share Attributable to Unisys Corporation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic earnings (loss) per common share computation                      
Net income (loss) attributable to Unisys Corporation common shareholders                 $ (47.7) $ (109.9) $ 44.0
Weighted average shares (in shares)                 50,060 49,905 49,280
Basic earnings (loss) per common share (in dollars per share) $ (0.02) $ (0.56) $ 0.43 $ (0.80) $ 0.02 $ (0.19) $ (1.17) $ (0.87) $ (0.95) $ (2.20) $ 0.89
Diluted earnings (loss) per common share computation                      
Net income (loss) attributable to Unisys Corporation for diluted earnings per share                 $ (47.7) $ (109.9) $ 44.0
Weighted average shares (in shares)                 50,060 49,905 49,280
Plus incremental shares from assumed conversions:                      
Employee stock plans (in shares)                 0 0 304
Adjusted weighted average shares (in shares)                 50,060 49,905 49,584
Diluted earnings (loss) per common share (in dollars per share) $ (0.02) $ (0.56) $ 0.36 $ (0.80) $ 0.02 $ (0.19) $ (1.17) $ (0.87) $ (0.95) $ (2.20) $ 0.89