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Goodwill and other identifiable intangible assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Beginning balance	$ 67.6	$ 71.2
Impairment	(1.3)	(1.3)
Exchange difference	1.2	(2.3)
Ending balance	68.8	67.6
Gas Cylinders
Goodwill [Roll Forward]
Beginning balance	26.3	29.0
Impairment		(1.3)
Exchange difference	0.7	(1.4)
Ending balance	27.0	26.3
Elektron
Goodwill [Roll Forward]
Beginning balance	41.3	42.2
Impairment		0.0
Exchange difference	0.5	(0.9)
Ending balance	$ 41.8	$ 41.3

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.

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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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