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Goodwill and other identifiable intangible assets | 9 Months Ended
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Sep. 25, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other identifiable intangible assets | Goodwill and other identifiable intangible assets 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 |  |
Accumulated goodwill impairment losses in relation to continuing activities were $8.0 million as of September 25, 2022 and December 31, 2021. 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 |  |
Identifiable intangible asset amortization expense was $0.6 million and $0.7 million for the first nine months of 2022 and 2021 respectively. Intangible asset amortization expense in 2022 and each of the following four years is expected to be approximately $0.8 million.

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- References No definition available. + Details
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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI https://asc.fasb.org/topic&trid=2144416 + Details
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