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Earnings per common share (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation | The following table shows how earnings (loss) per common share attributable to Unisys Corporation was computed for the three years ended December 31, 2019 (shares in thousands).
Year ended December 31, |  | 2019 |  |  | 2018 |  |  | 2017 |
Basic earnings (loss) per common share computation: |  |  |  |  |  |
Net income (loss) attributable to Unisys Corporation common shareholders |  | $ | (17.2 | ) |  | $ | 75.5 |  |  | $ | (65.3 | )
Weighted average shares |  | 55,961 |  |  | 50,946 |  |  | 50,409 |
Basic earnings (loss) per common share |  | $ | (0.31 | ) |  | $ | 1.48 |  |  | $ | (1.30 | )
Diluted earnings (loss) per common share computation: |  |  |  |  |  |
Net income (loss) attributable to Unisys Corporation common shareholders |  | $ | (17.2 | ) |  | $ | 75.5 |  |  | $ | (65.3 | )
Add interest expense on convertible senior notes, net of tax of zero |  | — |  |  | 19.6 |  |  | — |
Net income (loss) attributable to Unisys Corporation for diluted earnings per share |  | $ | (17.2 | ) |  | $ | 95.1 |  |  | $ | (65.3 | )
Weighted average shares |  | 55,961 |  |  | 50,946 |  |  | 50,409 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |
Employee stock plans |  | — |  |  | 541 |  |  | — |
Convertible senior notes |  | — |  |  | 21,868 |  |  | — |
Adjusted weighted average shares |  | 55,961 |  |  | 73,355 |  |  | 50,409 |
Diluted earnings (loss) per common share |  | $ | (0.31 | ) |  | $ | 1.30 |  |  | $ | (1.30 | )
Anti-dilutive weighted-average stock options and restricted stock units(i) |  | 1,393 |  |  | 1,226 |  |  | 2,206 |
Anti-dilutive weighted-average common shares issuable upon conversion of the 5.50% convertible senior notes(i) |  | 16,578 |  |  | — |  |  | 21,868 |
(i)Amounts represent shares excluded from the computation of diluted earnings per share, as their effect, if included, would have been anti-dilutive for the periods presented.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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