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Finance costs (Tables)
 12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
Schedule of finance costs
Finance costs
 
 
2017
 
2016
 
2015
 
 
 
$M
 
$M
 
$M
 
 
Bank and other loan interest payable
6.3

 
6.3

 
6.5

 
 
Amortization of issue costs
0.6

 
0.5

 
0.9

 
 
Foreign exchange loss on financing activities
0.3

 
—

 
—

 
 
IAS 19R retirement benefits finance charge
1.8

 
2.1

 
3.0

 
 
Unwind of discount on deferred contingent consideration from acquisitions
0.2

 
0.4

 
0.4

 
 
Total finance costs
9.2

 
9.3

 
10.8