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Earnings per common share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings per common share | Earnings per common share The following table shows how the loss per common share attributable to Unisys Corporation was computed for the three years ended December 31, 2017 (shares in thousands).
Year ended December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |
Basic earnings (loss) per common share computation: |  |  |  |  |  |
Net loss attributable to Unisys Corporation common shareholders |  | $ | (65.3 | ) |  | $ | (47.7 | ) |  | $ | (109.9 | )
Weighted average shares |  | 50,409 |  |  | 50,060 |  |  | 49,905 |
Basic loss per common share |  | $ | (1.30 | ) |  | $ | (0.95 | ) |  | $ | (2.20 | )
Diluted earnings (loss) per common share computation: |  |  |  |  |  |
Net loss attributable to Unisys Corporation for diluted earnings per share |  | $ | (65.3 | ) |  | $ | (47.7 | ) |  | $ | (109.9 | )
Weighted average shares |  | 50,409 |  |  | 50,060 |  |  | 49,905 |
Diluted loss per common share |  | $ | (1.30 | ) |  | $ | (0.95 | ) |  | $ | (2.20 | )
Anti-dilutive weighted-average stock options and restricted stock units(a) |  | 2,206 |  |  | 3,553 |  |  | 2,915 |
Anti-dilutive weighted-average common shares issuable upon conversion of the 5.50% convertible senior notes(a) |  | 21,868 |  |  | 17,230 |  |  | — |
(a)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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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