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Related Party Transactions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 22, 2019
Related Party Transaction [Line Items]        
Net sales to Glencore $ 1,191.6 $ 1,204.5 $ 1,198.1  
Glencore [Member]        
Related Party Transaction [Line Items]        
Net sales to Glencore 1,191.6 1,204.5 1,198.1  
Purchases from Glencore 323.9 319.6 253.0  
BHH [Member]        
Related Party Transaction [Line Items]        
Purchases from BHH $ 17.8 $ 28.4 $ 15.8  
Ownership percentage, equity method       40.00%