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Impairment of goodwill - Movement in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in goodwill [abstract]
Goodwill, beginning balance	$ 56.9	$ 62.2
Additions		0.1
Exchange difference	2.7	(5.4)
Goodwill, ending balance	59.6	56.9
Gas Cylinders
Reconciliation of changes in goodwill [abstract]
Goodwill, beginning balance	18.9	22.3
Additions		0.0
Exchange difference	1.6	(3.4)
Goodwill, ending balance	20.5	18.9
Elektron
Reconciliation of changes in goodwill [abstract]
Goodwill, beginning balance	38.0	39.9
Additions		0.1
Exchange difference	1.1	(2.0)
Goodwill, ending balance	$ 39.1	$ 38.0

X

- Definition

The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2017-01-01
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- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill]

+ References

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