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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
Basic and diluted earnings per share were calculated as follows:
 
 
Second Quarter
Year-to-date
 
 
In millions except share and per-share data
2019
 
2018
 
2019
 
2018
 
 
Basic earnings:
 
 
 
 
 
 
 
 
 
Net income / (loss)
$
3.5

 
$
11.4

 
$
(0.3
)
 
$
21.3

 
 
Weighted average number of £0.50 ordinary shares:
 
 
 
 
 
 
 
 
 
For basic earnings per share
27,302,174

 
26,558,883

 
27,168,170

 
26,535,824

 
 
Dilutive effect of potential common stock
587,735

 
1,025,632

 
—

 
860,733

 
 
For diluted earnings per share
27,889,909

 
27,584,515

 
27,168,170

 
27,396,557

 
 
Earnings per share using weighted average number of ordinary shares outstanding:
 
 
 
 
 
 
 
 
 
Basic earnings / (loss) per ordinary share
$
0.13

 
$
0.43

 
$
(0.01
)
 
$
0.80

 
 
Diluted earnings / (loss) per ordinary share
$
0.13

 
$
0.41

 
$
(0.01
)
 
$
0.78