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Derivatives - Net Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ (63.3) $ 3.7 $ (161.4) $ 7.5
Commodity contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net (63.6) 2.9 (159.6) 11.8
Commodity contract [Member] | Glencore [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net (28.7) (7.9) (53.5) 4.7
Foreign exchange contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ 0.3 $ 0.8 $ (1.8) $ (4.3)