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Acquisitions and disposals Acquisition and disposals (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Cash proceeds | $ 4.4 | $ 0.0 | $ 0.1
Magnesium Elektron CZ s.r.o. Subsidiary | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |
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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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109240241&loc=d3e32211-110900 + Details
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