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Subsequent Events (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Mar. 10, 2019
Held-for-sale | Magnesium Elektron CZ s.r.o. Subsidiary    
Subsequent Event [Line Items]    
Impairment of buildings to be disposed of $ 3.4  
Subsequent Event    
Subsequent Event [Line Items]    
Payment committed related to aborted acquisition (up to)   $ 3.5