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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Beginning balance	$ 71.2	$ 67.9
Exchange difference	(2.3)	3.3
Impairment	(1.3)
Ending balance	67.6	71.2
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	29.0	27.0
Exchange difference	(1.4)	2.0
Impairment	(1.3)
Ending balance	26.3	29.0
Elektron
Goodwill [Roll Forward]
Beginning balance	42.2	40.9
Exchange difference	(0.9)	1.3
Impairment	0.0
Ending balance	$ 41.3	$ 42.2

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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