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Supplementary balance sheet information - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) facility | Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Tangible asset impairment charges | $ 6.6 | $ 2.8
Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Amount of property disposed | 5.5 |
Building | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Amount of property disposed | $ 4.7 |
Number of properties to be disposed | facility | 2 |
Impairment of assets held-for-sale | $ 1.1 |
Magnesium Elektron CZ s.r.o. Subsidiary | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Impairment of buildings to be disposed of | 3.4 |
Elektron segment |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Tangible asset impairment charges | 1.5 | 1.3
Gas Cylinders segment |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Tangible asset impairment charges | $ 5.1 | $ 1.5

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