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Goodwill and other identifiable intangible assets (Tables) | 9 Months Ended
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Sep. 25, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in goodwill during the first nine months ended September 25, 2022, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2022 | $ | 27.6 |  |  | $ | 42.1 |  |  | $ | 69.7 |  |
| Exchange difference | (4.5) |  |  | (2.7) |  |  | (7.2) |  |
| Net balance at September 25, 2022 | $ | 23.1 |  |  | $ | 39.4 |  |  | $ | 62.5 |  |
Schedule of Intangible Assets | Identifiable intangible assets consisted of the following:
| In millions | Customer relationships |  | Technology and trading related |  | Total |
| Cost: |  |  |  |  |  |
| At January 1, 2022 | $ | 15.2 |  |  | $ | 8.2 |  |  | $ | 23.4 |  |
| Exchange movements | — |  |  | (1.4) |  |  | (1.4) |  |
| At September 25, 2022 | $ | 15.2 |  |  | $ | 6.8 |  |  | $ | 22.0 |  |
| Accumulated amortization: |  |  |  |  |
| At January 1, 2022 | $ | 5.7 |  |  | $ | 4.0 |  |  | $ | 9.7 |  |
| Provided during the period | 0.4 |  |  | 0.2 |  |  | 0.6 |  |
| Exchange movements | — |  |  | (0.7) |  |  | (0.7) |  |
| At September 25, 2022 | $ | 6.1 |  |  | $ | 3.5 |  |  | $ | 9.6 |  |
| Net book values: |  |  |  |  |  |
| At January 1, 2022 | $ | 9.5 |  |  | $ | 4.2 |  |  | $ | 13.7 |  |
| At September 25, 2022 | $ | 9.1 |  |  | $ | 3.3 |  |  | $ | 12.4 |  |

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