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Goodwill and other identifiable intangible assets | 9 Months Ended
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Sep. 29, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and other identifiable intangible assets | Goodwill and other identifiable intangible assets Changes in goodwill during 2019, were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2019 | $ | 26.3 |  |  | $ | 41.3 |  |  | $ | 67.6 |  |
| Exchange difference | (0.8 | ) |  | (0.4 | ) |  | (1.2 | ) |
| Balance at September 29, 2019 | $ | 25.5 |  |  | $ | 40.9 |  |  | $ | 66.4 |  |
Identifiable intangible assets consisted of the following:
|  | September 29, 2019 |  | December 31, 2018 |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 13.4 |  |  | $ | (4.5 | ) |  | $ | 8.9 |  |  | $ | 13.4 |  |  | $ | (3.8 | ) |  | $ | 9.6 |  |
| Technology and trading related | 7.6 |  |  | (3.1 | ) |  | 4.5 |  |  | 7.9 |  |  | (2.9 | ) |  | 5.0 |  |
|  | $ | 21.0 |  |  | $ | (7.6 | ) |  | $ | 13.4 |  |  | $ | 21.3 |  |  | $ | (6.7 | ) |  | $ | 14.6 |  |
Identifiable intangible asset amortization expense was $0.9 million for the first three-quarters of 2019 and 2018, respectively. Intangible asset amortization expense for the remainder of 2019 and over the next five years is expected to be approximately $0.3 million in 2019, $1.1 million in 2020, $1.1 million in 2021, $1.1 million in 2022, $1.1 million in 2023 and $1.1 million in 2024.

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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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