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Earnings per common share
 12 Months Ended
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.