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Impairment of goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Impairment Of Assets [Abstract]  
Disclosure of reconciliation of changes in goodwill
The table below summarizes the carrying value of goodwill by division:
 
 
Gas Cylinders
Division
 
Elektron
Division
 
Total
 
 
 
$M
 
$M
 
$M
 
 
At January 1, 2016
22.3

 
39.9

 
62.2

 
 
Additions
—

 
0.1

 
0.1

 
 
Exchange difference
(3.4
)
 
(2.0
)
 
(5.4
)
 
 
At December 31, 2016
18.9

 
38.0

 
56.9

 
 
Exchange difference
1.6

 
1.1

 
2.7

 
 
At December 31, 2017
20.5

 
39.1

 
59.6