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Goodwill and other identifiable intangible assets (Tables) | 3 Months Ended
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Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in goodwill during the first three months ended March 31, 2024, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2024 | $ | 26.2 |  |  | $ | 41.3 |  |  | $ | 67.5 |  |
| Exchange difference | (0.2) |  |  | (0.1) |  |  | (0.3) |  |
| Net balance at March 31, 2024 | $ | 26.0 |  |  | $ | 41.2 |  |  | $ | 67.2 |  |
Schedule of Intangible Assets | Identifiable intangible assets consisted of the following:
| In millions | Customer relationships |  | Technology and trading related |  | Total |
| Cost: |  |  |  |  |  |
| At January 1, 2024 | $ | 15.2 |  |  | $ | 7.8 |  |  | $ | 23.0 |  |
| Exchange movements | — |  |  | (0.1) |  |  | (0.1) |  |
| At March 31, 2024 | $ | 15.2 |  |  | $ | 7.7 |  |  | $ | 22.9 |  |
| Accumulated amortization: |  |  |  |  |
| At January 1, 2024 | $ | 6.6 |  |  | $ | 4.4 |  |  | $ | 11.0 |  |
| Provided during the period | 0.1 |  |  | 0.1 |  |  | 0.2 |  |
| Exchange movements | — |  |  | (0.1) |  |  | (0.1) |  |
| At March 31, 2024 | $ | 6.7 |  |  | $ | 4.4 |  |  | $ | 11.1 |  |
| Net book values: |  |  |  |  |  |
| At January 1, 2024 | $ | 8.6 |  |  | $ | 3.4 |  |  | $ | 12.0 |  |
| At March 31, 2024 | $ | 8.5 |  |  | $ | 3.3 |  |  | $ | 11.8 |  |

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