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Goodwill and other identifiable intangible assets
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other identifiable intangible assets
Goodwill and other identifiable intangible assets
Changes in goodwill during 2019, were as follows:
 
In millions
Gas Cylinders
 
Elektron
 
Total
 
 
At January 1, 2019
$
26.3

 
$
41.3

 
$
67.6

 
 
Exchange difference
(0.1
)
 
(0.1
)
 
(0.2
)
 
 
Balance at June 30, 2019
$
26.2

 
$
41.2

 
$
67.4

 


Identifiable intangible assets consisted of the following:
 
 
June 30, 2019
 
December 31, 2018
 
 
In millions
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
 
 
Customer relationships
$
13.4

 
$
(4.2
)
 
$
9.2

 
$
13.4

 
$
(3.8
)
 
$
9.6

 
 
Technology and trading related
7.8

 
(3.1
)
 
4.7

 
7.9

 
(2.9
)
 
5.0

 
 
 
$
21.2

 
$
(7.3
)
 
$
13.9

 
$
21.3

 
$
(6.7
)
 
$
14.6

 


Identifiable intangible asset amortization expense was $0.6 million for the Second Quarter of 2019 and 2018, respectively.
Intangible asset amortization expense during the remainder of 2019 and over the next five years is expected to be approximately $0.6 million in 2019, $1.1 million in 2020, $1.1 million in 2021, $1.1 million in 2022, $1.1 million in 2023 and $1.1 million in 2024.