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Goodwill and other identifiable intangible assets | 9 Months Ended
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Sep. 26, 2021
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 26, 2021, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2021 | $ | 27.9 |  |  | $ | 42.3 |  |  | $ | 70.2 |  |
| Additions | 2.6 |  |  | — |  |  | 2.6 |  |
| Exchange difference | 0.1 |  |  | — |  |  | 0.1 |  |
| Net balance at September 26, 2021 | $ | 30.6 |  |  | $ | 42.3 |  |  | $ | 72.9 |  |
Identifiable intangible assets consisted of the following:
|  | September 26, 2021 |  | December 31, 2020 |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 13.4 |  |  | $ | (5.5) |  |  | $ | 7.9 |  |  | $ | 13.4 |  |  | $ | (5.2) |  |  | $ | 8.2 |  |
| Technology and trading related | 8.3 |  |  | (4.0) |  |  | 4.3 |  |  | 8.3 |  |  | (3.7) |  |  | 4.6 |  |
|  | $ | 21.7 |  |  | $ | (9.5) |  |  | $ | 12.2 |  |  | $ | 21.7 |  |  | $ | (8.9) |  |  | $ | 12.8 |  |
Identifiable intangible asset amortization expense was $0.7 million and $0.6 million for the first nine months of 2021 and 2020, respectively. Intangible asset amortization expense during the remainder of 2021 and over the next five years is expected to be approximately $0.2 million in 2021, $0.9 million in 2022, $0.9 million in 2023, $0.9 million in 2024, $0.9 million in 2025 and $0.9 million in 2026.

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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 http://asc.fasb.org/topic&trid=2144416 + Details
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