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Acquisitions and disposals - Gain on Disposal (Details) - Magnesium Elektron CZ s.r.o. Subsidiary - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Cash proceeds	$ 5.9
Cash held in business	(1.3)
Purchase price adjustment	(0.2)
Net proceeds	4.4
Net assets less cash	(3.6)
Gain on disposal	0.8
Disposal costs	(0.4)
Realized translation gain on disposal	2.5
Net gain on disposal	$ 2.9

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Proceeds From Divestiture of Businesses Net

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Amount of currency on hand, demand deposits with banks or financial institutions, and other kinds of accounts that have the general characteristics of demand deposits, held by a disposal group.

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Amount of foreign currency translation gain (loss) in the disposal group, including discontinued operation, recognized in the statement of income as a result of the sale or complete or substantially complete liquidation of an investment in a foreign entity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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