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Derivatives - Net Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ 231.8 $ (63.3) $ 175.1 $ (161.4)
Commodity contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net 237.0 (63.6) 181.3 (159.6)
Commodity contract [Member] | Glencore [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net 65.2 (28.7) 6.3 (53.5)
Foreign exchange contract [Member]        
Derivative [Line Items]        
Derivative, (loss) gain on derivative, net $ (5.2) $ 0.3 $ (6.2) $ (1.8)