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Earnings per common share (Tables)
 12 Months Ended
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.