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Acquisition and disposal related gains / (costs) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jul. 01, 2018
Apr. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net profit on disposal     $ 0      
Cash proceeds         $ 4,600,000 $ 0
Acquisition termination payment   $ 4,600,000   $ 0    
Magnesium Elektron CZ s.r.o. | Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Net profit on disposal $ 2,900,000          
Cash proceeds 5,900,000          
Cash held in business (1,300,000)       (1,300,000)  
Purchase price adjustment (200,000)       (200,000)  
Net proceeds 4,400,000          
Net assets less cash (3,600,000)       $ (3,600,000)  
Profit on disposal 800,000          
Disposal costs (400,000)          
Realized translation gain on disposal $ 2,500,000