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Goodwill and other identifiable intangible assets | 9 Months Ended
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Sep. 27, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other identifiable intangible assets | Goodwill and other identifiable intangible assets Changes in goodwill during the first three-quarters ended September 27, 2020, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2020 | $ | 27.0 |  |  | $ | 41.8 |  |  | $ | 68.8 |  |
| Exchange difference | (0.8) |  |  | (0.5) |  |  | (1.3) |  |
| Balance at September 27, 2020 | $ | 26.2 |  |  | $ | 41.3 |  |  | $ | 67.5 |  |
Identifiable intangible assets consisted of the following:
|  | September 27, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |  |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 13.4 |  |  | $ | (5.0) |  |  | $ | 8.4 |  |  | $ | 13.4 |  |  | $ | (4.6) |  |  | $ | 8.8 |  |
| Technology and trading related | 7.7 |  |  | (3.4) |  |  | 4.3 |  |  | 8.1 |  |  | (3.3) |  |  | 4.8 |  |
|  | $ | 21.1 |  |  | $ | (8.4) |  |  | $ | 12.7 |  |  | $ | 21.5 |  |  | $ | (7.9) |  |  | $ | 13.6 |  |
Identifiable intangible asset amortization expense was $0.6 million and $0.9 million for the first three-quarters of 2020 and 2019 respectively. Intangible asset amortization expense during the remainder of 2020 and over the next five years is expected to be approximately $0.1 million in 2020, $0.7 million in 2021, $0.7 million in 2022, $0.7 million in 2023, $0.7 million in 2024 and $0.7 million in 2025.

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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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