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Goodwill and other identifiable intangible assets | 9 Months Ended
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Oct. 01, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other identifiable intangible assets | Goodwill and other identifiable intangible assets Changes in goodwill during the first nine months ended October 1, 2023, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2023 | $ | 25.0 |  |  | $ | 40.6 |  |  | $ | 65.6 |  |
| Exchange difference | 0.2 |  |  | 0.2 |  |  | 0.4 |  |
| Net balance at October 1, 2023 | $ | 25.2 |  |  | $ | 40.8 |  |  | $ | 66.0 |  |
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of October 1, 2023 and December 31, 2022. Identifiable intangible assets consisted of the following:
| In millions | Customer relationships |  | Technology and trading related |  | Total |
| Cost: |  |  |  |  |  |
| At January 1, 2023 | $ | 15.2 |  |  | $ | 7.4 |  |  | $ | 22.6 |  |
| Exchange movements | — |  |  | 0.1 |  |  | 0.1 |  |
| At October 1, 2023 | $ | 15.2 |  |  | $ | 7.5 |  |  | $ | 22.7 |  |
| Accumulated amortization: |  |  |  |  |
| At January 1, 2023 | $ | 6.1 |  |  | $ | 4.0 |  |  | $ | 10.1 |  |
| Charge | 0.3 |  |  | 0.3 |  |  | 0.6 |  |
| At October 1, 2023 | $ | 6.4 |  |  | $ | 4.3 |  |  | $ | 10.7 |  |
| Net book values: |  |  |  |  |  |
| At January 1, 2023 | $ | 9.1 |  |  | $ | 3.4 |  |  | $ | 12.5 |  |
| At October 1, 2023 | $ | 8.8 |  |  | $ | 3.2 |  |  | $ | 12.0 |  |
Identifiable intangible asset amortization expense was $0.6 million for the first nine months of 2023 and 2022, respectively. Intangible asset amortization expense in 2023 and each of the following four years is expected to be approximately $0.8 million per year.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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