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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Classes of current inventories [abstract]  
Schedule of Inventories
 
 
December 31, 2017
 
December 31, 2016
 
 
 
$M
 
$M
 
 
Raw materials and consumables
31.0

 
28.3

 
 
Work in progress
28.1

 
30.5

 
 
Finished goods and goods for resale
23.1

 
23.7

 
 
 
82.2

 
82.5