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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 | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Basic earnings (loss) per common share computation: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Unisys Corporation common shareholders | $ 25,000,000 | $ 6,100,000 | $ 3,800,000 | $ 40,600,000 | $ 50,500,000 | $ (41,100,000) | $ (42,000,000) | $ (32,700,000) | $ 75,500,000 | $ (65,300,000) | $ (47,700,000)
Weighted average shares (in shares) |  |  |  |  |  |  |  |  | 50,946 | 50,409 | 50,060
Basic earnings (loss) per common share (in dollars per share) | $ 0.49 | $ 0.12 | $ 0.07 | $ 0.80 | $ 1.00 | $ (0.81) | $ (0.83) | $ (0.65) | $ 1.48 | $ (1.30) | $ (0.95)
Diluted earnings (loss) per common share computation: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Unisys Corporation common shareholders | $ 25,000,000 | $ 6,100,000 | $ 3,800,000 | $ 40,600,000 | $ 50,500,000 | $ (41,100,000) | $ (42,000,000) | $ (32,700,000) | $ 75,500,000 | $ (65,300,000) | $ (47,700,000)
Add interest expense on convertible senior notes, net of tax of zero |  |  |  |  |  |  |  |  | 19,600,000 | 0 | 0
Interest expense on convertible senior notes, tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) attributable to Unisys Corporation for diluted earnings per share |  |  |  |  |  |  |  |  | $ 95,100,000 | $ (65,300,000) | $ (47,700,000)
Weighted average shares (in shares) |  |  |  |  |  |  |  |  | 50,946 | 50,409 | 50,060
Plus incremental shares from assumed conversions: |  |  |  |  |  |  |  |  |  |  |
Employee stock plans (in shares) |  |  |  |  |  |  |  |  | 541 | 0 | 0
Convertible senior notes (in shares) |  |  |  |  |  |  |  |  | 21,868 | 0 | 0
Adjusted weighted average shares (in shares) |  |  |  |  |  |  |  |  | 73,355 | 50,409 | 50,060
Diluted earnings (loss) per common share (in dollars per share) | $ 0.41 | $ 0.12 | $ 0.07 | $ 0.62 | $ 0.76 | $ (0.81) | $ (0.83) | $ (0.65) | $ 1.30 | $ (1.30) | $ (0.95)
Stock options and restricted stock units |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive weighted-average securities (in shares) |  |  |  |  |  |  |  |  | 1,226 | 2,206 | 3,553
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) |  |  |  |  |  |  |  |  | 0 | 21,868 | 17,230
Convertible senior notes interest rate | 5.50% |  |  |  |  |  |  |  | 5.50% |  |

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