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Impairment of goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Impairment Of Assets [Abstract] |
Disclosure of reconciliation of changes in goodwill | The table below summarizes the carrying value of goodwill by division:
|  | Gas Cylinders Division |  | Elektron Division |  | Total |
|  | $M |  | $M |  | $M |
| At January 1, 2016 | 22.3 |  |  | 39.9 |  |  | 62.2 |  |
| Additions | — |  |  | 0.1 |  |  | 0.1 |  |
| Exchange difference | (3.4 | ) |  | (2.0 | ) |  | (5.4 | ) |
| At December 31, 2016 | 18.9 |  |  | 38.0 |  |  | 56.9 |  |
| Exchange difference | 1.6 |  |  | 1.1 |  |  | 2.7 |  |
| At December 31, 2017 | 20.5 |  |  | 39.1 |  |  | 59.6 |  |

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- Definition The disclosure of the reconciliation of changes in goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition Impairment Of Assets [Abstract] + References No definition available. + Details
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