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Quarterly financial information (unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 741.5 $ 757.6 $ 753.8 $ 695.8 $ 760.9 $ 688.3 $ 667.4 $ 708.4 $ 2,948.7 $ 2,825.0 $ 2,741.8
Gross profit 150.2 172.4 193.9 149.9 178.4 153.8 152.9 201.2 666.4 686.3  
Income (loss) before income taxes (5.7) 6.5 41.9 (3.0) 38.1 22.2 20.3 62.6 39.7 143.2 (72.1)
Net income (loss) attributable to Unisys Corporation common shareholders $ (10.8) $ (13.2) $ 26.2 $ (19.4) $ 25.0 $ 6.1 $ 3.8 $ 40.6 $ (17.2) $ 75.5 $ (65.3)
Earnings (loss) per common share attributable to Unisys Corporation                      
Basic (in dollars per share) $ (0.17) $ (0.23) $ 0.51 $ (0.38) $ 0.49 $ 0.12 $ 0.07 $ 0.80 $ (0.31) $ 1.48 $ (1.30)
Diluted (in dollars per share) $ (0.17) $ (0.23) $ 0.42 $ (0.38) $ 0.41 $ 0.12 $ 0.07 $ 0.62 $ (0.31) $ 1.30 $ (1.30)