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Goodwill and other identifiable intangible assets | 12 Months Ended
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Dec. 31, 2023
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, 2023 and 2022 were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2022 | $ | 27.6 |  |  | $ | 42.1 |  |  | $ | 69.7 |  |
| Exchange difference | (2.6) |  |  | (1.5) |  |  | (4.1) |  |
| At December 31, 2022 | 25.0 |  |  | 40.6 |  |  | 65.6 |  |
| Exchange difference | 1.2 |  |  | 0.7 |  |  | 1.9 |  |
| Net balance at December 31, 2023 | $ | 26.2 |  |  | $ | 41.3 |  |  | $ | 67.5 |  |
Accumulated goodwill impairment losses in relation to continuing operations were $8.0 million as of December 31, 2023 and 2022. Changes in the gross value of identifiable intangible assets during the year ended December 31, 2023, were as follows:
| In millions | Customer relationships | Technology and trading related | Total |
| At January 1, 2022 | $ | 15.2 |  | $ | 8.2 |  | $ | 23.4 |  |
| Exchange movements | — |  | (0.8) |  | (0.8) |  |
| At December 31, 2022 | $ | 15.2 |  | $ | 7.4 |  | $ | 22.6 |  |
| Exchange movements | — |  | 0.4 |  | 0.4 |  |
| At December 31, 2023 | $ | 15.2 |  | $ | 7.8 |  | $ | 23.0 |  |
Identifiable intangible assets consisted of the following:
|  | December 31, 2023 |  | December 31, 2022 |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 15.2 |  |  | $ | (6.6) |  |  | $ | 8.6 |  |  | $ | 15.2 |  |  | $ | (6.1) |  |  | $ | 9.1 |  |
| Technology and trading related | 7.8 |  |  | (4.4) |  |  | 3.4 |  |  | 7.4 |  |  | (4.0) |  |  | 3.4 |  |
| Total identifiable intangibles | $ | 23.0 |  |  | $ | (11.0) |  |  | $ | 12.0 |  |  | $ | 22.6 |  |  | $ | (10.1) |  |  | $ | 12.5 |  |
Identifiable intangible asset amortization expense in 2023, 2022 and 2021 was $0.8 million, $0.7 million and $0.9 million, respectively. Intangible asset amortization expense over the next five years is expected to be approximately $0.8 million per year. The weighted-average amortization period for the customer relationships is 15 years and for the technology and trading related assets is 13 years.

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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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