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Goodwill and other identifiable intangible assets (Tables) | 6 Months Ended
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Jun. 26, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in goodwill during the first half ended June 26, 2022, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2022 | $ | 27.6 |  |  | $ | 42.1 |  |  | $ | 69.7 |  |
| Exchange difference | (2.1) |  |  | (1.3) |  |  | (3.4) |  |
| Net balance at June 26, 2022 | $ | 25.5 |  |  | $ | 40.8 |  |  | $ | 66.3 |  |
Schedule of Intangible Assets | Identifiable intangible assets consisted of the following:
|  | Customer relationships |  | Technology and trading related |  | Total |
|  | $M |  | $M |  | $M |
| Cost: |  |  |  |  |  |
| At January 1, 2022 | 15.2 |  |  | 8.2 |  |  | 23.4 |  |
| Exchange movements | — |  |  | (0.6) |  |  | (0.6) |  |
| At June 26, 2022 | 15.2 |  |  | 7.6 |  |  | 22.8 |  |
| Accumulated amortization: |  |  |  |  |
| At January 1, 2022 | 5.7 |  |  | 4.0 |  |  | 9.7 |  |
| Provided during the period | 0.2 |  |  | 0.2 |  |  | 0.4 |  |
| Exchange movements | — |  |  | (0.3) |  |  | (0.3) |  |
| At June 26, 2022 | 5.9 |  |  | 3.9 |  |  | 9.8 |  |
| Net book values: |  |  |  |  |  |
| At January 1, 2022 | 9.5 |  |  | 4.2 |  |  | 13.7 |  |
| At June 26, 2022 | 9.3 |  |  | 3.7 |  |  | 13.0 |  |

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