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Derivatives - Net Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ (9.4) $ 10.3 $ (1.9) $ 10.7
Commodity Contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net (11.0) 10.6 0.8 11.2
Commodity Contract [Member] | Glencore [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net (4.6) 1.9 0.1 2.7
Foreign Exchange Contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ 1.6 $ (0.3) $ (2.7) $ (0.5)