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Derivatives Net Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ 6.1 $ 1.2 $ 0.4 $ 1.9
Commodity Contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net 6.1 1.2 0.6 1.9
Commodity Contract [Member] | Glencore [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net 1.8 (0.3) 0.8 0.1
Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ 0.0 $ 0.0 $ (0.2) $ 0.0