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Derivatives - Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Due to affiliate, current	$ 88.3	$ 65.8
Due to affiliate, noncurrent	52.9	21.9
Not designated as hedging instrument [Member]
Derivative [Line Items]
Derivative asset	84.7	42.9
Derivative liability	223.5	146.2
Not designated as hedging instrument [Member] | Commodity contract [Member]
Derivative [Line Items]
Derivative asset	84.7	42.9
Derivative liability	220.0	143.3
Not designated as hedging instrument [Member] | Foreign exchange contract [Member]
Derivative [Line Items]
Derivative asset	0.0	0.0
Derivative liability	3.5	2.9
Glencore [Member] | Commodity contract [Member]
Derivative [Line Items]
Due to affiliate, current	37.9	17.1
Due to affiliate, noncurrent	$ 52.9	$ 21.9

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