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Earnings (loss) per common share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic loss per common share computation:      
Net loss attributable to Unisys Corporation $ (193.4) $ (430.7) $ (106.0)
Weighted average shares (in shares) 69,199 68,254 67,665
Basic loss per common share (in dollars per share) $ (2.79) $ (6.31) $ (1.57)
Diluted loss per common share computation:      
Net loss attributable to Unisys Corporation $ (193.4) $ (430.7) $ (106.0)
Weighted average shares (in shares) 69,199 68,254 67,665
Plus incremental shares from assumed conversions of employee stock plans (in shares) 0 0 0
Adjusted weighted average shares (in shares) 69,199 68,254 67,665
Diluted loss per common share (in dollars per share) $ (2.79) $ (6.31) $ (1.57)
Restricted Stock Units      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive weighted-average restricted stock units (in shares) 2,340 945 481