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Supplementary balance sheet information - Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) facility | Dec. 31, 2018 USD ($) facility
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Inventories | $ 94.5 | $ 93.6
Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Amount of property disposed | 3.7 | $ 5.5
Building | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties to be disposed | facility |  | 2
Amount of property disposed |  | $ 4.7
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 | $ 0.2 | 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
Elektron segment | Building | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of properties to be disposed | facility | 1 |
Amount of property disposed | $ 3.7 |
Gas Cylinders segment |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Tangible asset impairment charges |  | 5.1
Gas Cylinders segment | Held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Inventories | 0.2 |
Restructuring Charges |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Tangible asset impairment charges | 4.6 | 6.6
Impairment Charges |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Tangible asset impairment charges | $ 5.2 | $ 0.0

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