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Goodwill and other identifiable intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in goodwill during the years ended December 31, 2019 and 2018 were as follows:
| In millions | Gas Cylinders |  | Elektron |  | Total |
| At January 1, 2018 | $ | 29.0 |  |  | $ | 42.2 |  |  | $ | 71.2 |  |
| Impairments | (1.3 | ) |  | — |  |  | (1.3 | ) |
| Exchange difference | (1.4 | ) |  | (0.9 | ) |  | (2.3 | ) |
| At December 31, 2018 | $ | 26.3 |  |  | $ | 41.3 |  |  | $ | 67.6 |  |
| Exchange difference | 0.7 |  |  | 0.5 |  |  | 1.2 |  |
| Net balance at December 31, 2019 | $ | 27.0 |  |  | $ | 41.8 |  |  | $ | 68.8 |  |
Schedule of Intangible Assets | Identifiable intangible assets consisted of the following:
|  | December 31, 2019 |  | December 31, 2018 |
| In millions | Gross |  | Accumulated amortization |  | Net |  | Gross |  | Accumulated amortization |  | Net |
| Customer relationships | $ | 13.4 |  |  | $ | (4.6 | ) |  | $ | 8.8 |  |  | $ | 13.4 |  |  | $ | (3.8 | ) |  | $ | 9.6 |  |
| Technology and trading related | 8.1 |  |  | (3.3 | ) |  | 4.8 |  |  | 7.9 |  |  | (2.9 | ) |  | 5.0 |  |
|  | $ | 21.5 |  |  | $ | (7.9 | ) |  | $ | 13.6 |  |  | $ | 21.3 |  |  | $ | (6.7 | ) |  | $ | 14.6 |  |

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