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Goodwill and other identifiable intangible assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in goodwill during the years ended December 31, 2018 and 2017 were as follows:
 
In millions
Gas Cylinders
 
Elektron
 
Total
 
 
At January 1, 2017
$
27.0

 
$
40.9

 
$
67.9

 
 
Exchange difference
2.0

 
1.3

 
3.3

 
 
At December 31, 2017
$
29.0

 
$
42.2

 
$
71.2

 
 
Impairment
(1.3
)
 
—

 
(1.3
)
 
 
Exchange difference
(1.4
)
 
(0.9
)
 
(2.3
)
 
 
Net balance at December 31, 2018
$
26.3

 
$
41.3

 
$
67.6

 
Schedule of Intangible Assets
Identifiable intangible assets consisted of the following:
 
 
December 31, 2018
 
December 31, 2017
 
 
In millions
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
 
 
Customer relationships
$
13.4

 
$
(3.8
)
 
$
9.6

 
$
13.4

 
$
(2.9
)
 
$
10.5

 
 
Technology and trading related
7.9

 
(2.9
)
 
5.0

 
8.6

 
(3.0
)
 
5.6

 
 
 
$
21.3

 
$
(6.7
)
 
$
14.6

 
$
22.0

 
$
(5.9
)
 
$
16.1