Derivatives - Net Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	$ (25.2)	$ 112.6	$ (73.7)	$ 287.7
Commodity contracts
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	(24.8)	120.0	(74.9)	301.3
Commodity contracts | Related Party | Glencore
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	(3.1)	13.1	(6.6)	19.4
Foreign exchange contracts
Derivative [Line Items]
Derivative, (loss) gain on derivative, net	$ (0.4)	$ (7.4)	$ 1.2	$ (13.6)