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Earnings per common share (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation | The following table shows how the earnings (loss) per common share attributable to Unisys Corporation were computed for the three years ended December 31, 2016.
Year ended December 31, |  | 2016 |  |  | 2015 |  |  | 2014 |
Basic earnings (loss) per common share computation |  |  |  |  |  |
Net income (loss) attributable to Unisys Corporation common shareholders |  | $ | (47.7 | ) |  | $ | (109.9 | ) |  | $ | 44.0 |
Weighted average shares (thousands) |  | 50,060 |  |  | 49,905 |  |  | 49,280 |
Basic earnings (loss) per common share |  | $ | (0.95 | ) |  | $ | (2.20 | ) |  | $ | 0.89 |
Diluted earnings (loss) per common share computation |  |  |  |  |  |
Net income (loss) attributable to Unisys Corporation for diluted earnings per share |  | $ | (47.7 | ) |  | $ | (109.9 | ) |  | $ | 44.0 |
Weighted average shares (thousands) |  | 50,060 |  |  | 49,905 |  |  | 49,280 |
Plus incremental shares from assumed conversions: |  |  |  |  |  |
Employee stock plans |  | — |  |  | — |  |  | 304 |
Adjusted weighted average shares |  | 50,060 |  |  | 49,905 |  |  | 49,584 |
Diluted earnings (loss) per common share |  | $ | (0.95 | ) |  | $ | (2.20 | ) |  | $ | 0.89 |

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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://www.xbrl.org/2003/role/presentationRef -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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