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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings per share [abstract]  
Schedule of earnings per share
Management believe the use of non-GAAP financial measures such as adjusted earnings, as reconciled in the table below, per share more closely reflects the underlying earnings per share performance.
 
 
2017
 
2016
 
2015
 
 
 
$M
 
$M
 
$M
 
 
Basic earnings:
 
 
 
 
 
 
 
Net income
11.5

 
21.9

 
16.1

 
 
Adjusted earnings:
 
 
 
 
 
 
 
Accounting charges relating to acquisitions and disposals of businesses
 
 
 
 
 
 
 
Unwind of discount on deferred contingent consideration from acquisitions
0.2

 
0.4

 
0.4

 
 
Acquisitions and disposals (Note 5)
(1.3
)
 
(0.2
)
 
2.0

 
 
Amortization on acquired intangibles
1.2

 
1.0

 
1.4

 
 
IAS 19R retirement benefits finance charge
1.8

 
2.1

 
3.0

 
 
Profit on sale of redundant site (Note 5)
(0.4
)
 
(2.1
)
 
—

 
 
Changes to defined benefit pension plans (Note 5)
—

 
(0.6
)
 
(18.0
)
 
 
Restructuring and other expense (Note 5)
21.6

 
2.2

 
22.4

 
 
Other share based compensation charges
2.2

 
1.4

 
1.3

 
 
Impact from U.S. tax reform
(6.0
)
 
—

 
—

 
 
Income tax thereon
(3.2
)
 
(1.4
)
 
0.9

 
 
Adjusted net income
27.6

 
24.7

 
29.5

 
 
Weighted average number of £0.50 ordinary shares:
 
 
 
 
 
 
 
For basic earnings per share
26,460,947

 
26,443,662

 
26,918,987

 
 
Exercise of share options
541,223

 
270,997

 
453,736

 
 
For diluted earnings per share
27,002,170

 
26,714,659

 
27,372,723

 
 
Earnings per share using weighted average number of ordinary shares outstanding:
 
 
 
 
 
 
 
Basic
 
 
 
 
 
 
 
Adjusted
$
1.04

 
$
0.93

 
$
1.10

 
 
Unadjusted
$
0.43

 
$
0.83

 
$
0.60

 
 
Diluted
 
 
 
 
 
 
 
Adjusted
$
1.02

 
$
0.92

 
$
1.08

 
 
Unadjusted
$
0.43

 
$
0.82

 
$
0.59