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Goodwill and other identifiable intangible assets (Tables) | 6 Months Ended
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Jun. 28, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in goodwill during the first two quarters ended June 28, 2020, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2020 | $ | 27.0 |  |  | $ | 41.8 |  |  | $ | 68.8 |  |
| Exchange difference | (1.5) |  |  | (0.9) |  |  | (2.4) |  |
| Balance at June 28, 2020 | $ | 25.5 |  |  | $ | 40.9 |  |  | $ | 66.4 |  |
Schedule of Intangible Assets | Identifiable intangible assets consisted of the following:
|  | June 28, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |  |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 13.4 |  |  | $ | (4.9) |  |  | $ | 8.5 |  |  | $ | 13.4 |  |  | $ | (4.6) |  |  | $ | 8.8 |  |
| Technology and trading related | 7.6 |  |  | (3.3) |  |  | 4.3 |  |  | 8.1 |  |  | (3.3) |  |  | 4.8 |  |
|  | $ | 21.0 |  |  | $ | (8.2) |  |  | $ | 12.8 |  |  | $ | 21.5 |  |  | $ | (7.9) |  |  | $ | 13.6 |  |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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