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Goodwill and other identifiable intangible assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and other identifiable intangible assets Goodwill and other identifiable intangible assets
Changes in goodwill during the years ended December 31, 2019 and 2018 were as follows:
 
In millions
Gas Cylinders
 
Elektron
 
Total
 
 
At January 1, 2018
$
29.0

 
$
42.2

 
$
71.2

 
 
Impairments
(1.3
)
 
—

 
(1.3
)
 
 
Exchange difference
(1.4
)
 
(0.9
)
 
(2.3
)
 
 
At December 31, 2018
$
26.3

 
$
41.3

 
$
67.6

 
 
Exchange difference
0.7

 
0.5

 
1.2

 
 
Net balance at December 31, 2019
$
27.0

 
$
41.8

 
$
68.8

 


Accumulated goodwill impairment losses were $9.6 million as of December 31, 2019 and 2018.
Identifiable intangible assets consisted of the following:
 
 
December 31, 2019
 
December 31, 2018
 
 
In millions
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
 
 
Customer relationships
$
13.4

 
$
(4.6
)
 
$
8.8

 
$
13.4

 
$
(3.8
)
 
$
9.6

 
 
Technology and trading related
8.1

 
(3.3
)
 
4.8

 
7.9

 
(2.9
)
 
5.0

 
 
 
$
21.5

 
$
(7.9
)
 
$
13.6

 
$
21.3

 
$
(6.7
)
 
$
14.6

 


Identifiable intangible asset amortization expense in 2019, 2018 and 2017 was $1.2 million, $1.2 million and $1.3 million, respectively.
In 2018, we recorded, within impairment charges, an impairment charge of $1.3 million in the Gas Cylinders segment, associated with our Superform business unit.
In 2017, we recorded, within restructuring charges, an impairment charge of $0.5 million in the Gas Cylinders segment for technology and trading related intangibles following the announcement to exit our Luxfer HEI business.
Intangible asset amortization expense over the next five years is expected to be approximately $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.
The weighted-average amortization period for the customer relationships is 11 years and for the technology and trading related assets is 12 years.