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Goodwill and other identifiable intangible assets (Tables) | 3 Months Ended
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Mar. 28, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in goodwill during the First Quarter, ended March 28, 2021, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2021 | $ | 27.9 |  |  | $ | 42.3 |  |  | $ | 70.2 |  |
| Exchange difference | 0.2 |  |  | 0.1 |  |  | 0.3 |  |
| Balance at March 28, 2021 | $ | 28.1 |  |  | $ | 42.4 |  |  | $ | 70.5 |  |
Schedule of Intangible Assets | Identifiable intangible assets consisted of the following:
|  | March 28, 2021 |  | December 31, 2020 |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 13.4 |  |  | $ | (5.3) |  |  | $ | 8.1 |  |  | $ | 13.4 |  |  | $ | (5.2) |  |  | $ | 8.2 |  |
| Technology and trading related | 8.4 |  |  | (3.8) |  |  | 4.6 |  |  | 8.3 |  |  | (3.7) |  |  | 4.6 |  |
|  | $ | 21.8 |  |  | $ | (9.1) |  |  | $ | 12.7 |  |  | $ | 21.7 |  |  | $ | (8.9) |  |  | $ | 12.8 |  |

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