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Earnings (loss) per common share - Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation (Details) - USD ($)
$ / shares in Units, shares in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basic earnings (loss) per common share computation:      
Net loss from continuing operations attributable to Unisys Corporation $ (448,500,000) $ (317,700,000) $ (92,200,000)
Income from discontinued operations, net of tax 0 1,068,400,000 75,000,000
Net (loss) income attributable to Unisys Corporation $ (448,500,000) $ 750,700,000 $ (17,200,000)
Weighted average shares (in shares) 66,451 62,932 55,961
Basic earnings (loss) per share attributable to Unisys Corporation      
Continuing operations (in dollars per share) $ (6.75) $ (5.05) $ (1.65)
Discontinued operations (in dollars per share) 0 16.98 1.34
Total (in dollars per share) $ (6.75) $ 11.93 $ (0.31)
Diluted earnings (loss) per common share computation:      
Net loss from continuing operations attributable to Unisys Corporation $ (448,500,000) $ (317,700,000) $ (92,200,000)
Add interest expense on convertible senior notes, net of tax of zero 0 0 0
Interest expense on convertible senior notes, tax 0 0 0
Net loss from continuing operations attributable to Unisys Corporation for diluted earnings per share (448,500,000) (317,700,000) (92,200,000)
Income from discontinued operations, net of tax 0 1,068,400,000 75,000,000
Net (loss) income attributable to Unisys Corporation for diluted earnings per share $ (448,500,000) $ 750,700,000 $ (17,200,000)
Weighted average shares (in shares) 66,451 62,932 55,961
Plus incremental shares from assumed conversions:      
Employee stock plans (in shares) 0 0 0
Convertible senior notes (in shares) 0 0 0
Adjusted weighted average shares (in shares) 66,451 62,932 55,961
Diluted earnings (loss) per common share attributable to Unisys Corporation      
Continuing operations (in dollars per share) $ (6.75) $ (5.05) $ (1.65)
Discontinued operations (in dollars per share) 0 16.98 1.34
Total (in dollars per share) $ (6.75) $ 11.93 $ (0.31)
5.50% convertible senior notes due March 1, 2021 | Senior Notes      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stated interest rate (as a percentage)   5.50%  
Stock options and restricted stock units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive weighted-average securities (in shares) 871 579 1,393
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) 557 3,425 16,578