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Goodwill and other identifiable intangible assets | 6 Months Ended
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Jun. 27, 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 half ended June 27, 2021, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2021 | $ | 27.9 |  |  | $ | 42.3 |  |  | $ | 70.2 |  |
| Additions | 2.4 |  |  | — |  |  | 2.4 |  |
| Exchange difference | 0.5 |  |  | 0.2 |  |  | 0.7 |  |
| Net balance at June 27, 2021 | $ | 30.8 |  |  | $ | 42.5 |  |  | $ | 73.3 |  |
Identifiable intangible assets consisted of the following:
|  | June 27, 2021 |  | December 31, 2020 |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 13.4 |  |  | $ | (5.4) |  |  | $ | 8.0 |  |  | $ | 13.4 |  |  | $ | (5.2) |  |  | $ | 8.2 |  |
| Technology and trading related | 8.5 |  |  | (4.0) |  |  | 4.5 |  |  | 8.3 |  |  | (3.7) |  |  | 4.6 |  |
|  | $ | 21.9 |  |  | $ | (9.4) |  |  | $ | 12.5 |  |  | $ | 21.7 |  |  | $ | (8.9) |  |  | $ | 12.8 |  |
Identifiable intangible asset amortization expense was $0.4 million and $0.4 million for the first half 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 $0.3 million in 2021, $0.7 million in 2022, $0.7 million in 2023, $0.7 million in 2024, $0.7 million in 2025 and $0.7 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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