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Goodwill and other identifiable intangible assets | 12 Months Ended
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Dec. 31, 2025
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, 2025 and 2024 were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2024 | $ | 26.2 |  |  | $ | 41.3 |  |  | $ | 67.5 |  |
| Exchange difference | (0.3) |  |  | (0.2) |  |  | (0.5) |  |
| At December 31, 2024 | 25.9 |  |  | 41.1 |  |  | 67.0 |  |
| Exchange difference | 1.6 |  |  | 1.0 |  |  | 2.6 |  |
| Net balance at December 31, 2025 | $ | 27.5 |  |  | $ | 42.1 |  |  | $ | 69.6 |  |
Accumulated goodwill impairment losses in relation to continuing operations were $8.0 million as of December 31, 2025 and 2024. Changes in the gross value of identifiable intangible assets during the year ended December 31, 2025, were as follows:
| In millions | Customer relationships | Technology and trading related | Total |
| At January 1, 2024 | $ | 15.2 |  | $ | 7.8 |  | $ | 23.0 |  |
| Additions | 0.4 |  | — |  | 0.4 |  |
| Exchange movements | — |  | (0.1) |  | (0.1) |  |
| At December 31, 2024 | $ | 15.6 |  | $ | 7.7 |  | $ | 23.3 |  |
| Exchange movements | — |  | 0.5 |  | 0.5 |  |
| At December 31, 2025 | $ | 15.6 |  | $ | 8.2 |  | $ | 23.8 |  |
Identifiable intangible assets consisted of the following:
|  | December 31, 2025 |  | December 31, 2024 |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 15.6 |  |  | $ | (7.6) |  |  | $ | 8.0 |  |  | $ | 15.6 |  |  | $ | (7.0) |  |  | $ | 8.6 |  |
| Technology and trading related | 8.2 |  |  | (5.3) |  |  | 2.9 |  |  | 7.7 |  |  | (4.8) |  |  | 2.9 |  |
| Total identifiable intangibles | $ | 23.8 |  |  | $ | (12.9) |  |  | $ | 10.9 |  |  | $ | 23.3 |  |  | $ | (11.8) |  |  | $ | 11.5 |  |
Identifiable intangible asset amortization expense in 2025, 2024 and 2023 was $0.8 million, $0.8 million and $0.8 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 13 years and for the technology and trading related assets is 11 years.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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