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Derivatives - Net Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ 3.7 $ 6.1 $ 7.5 $ 0.4
Commodity Contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net 2.9 6.1 11.8 0.6
Commodity Contract [Member] | Glencore [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net (7.9) 1.8 4.7 0.8
Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ 0.8 $ 0.0 $ (4.3) $ (0.2)