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Derivatives - Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Due to affiliate, current	$ 26.6	$ 65.8
Due to affiliate, noncurrent	9.4	21.9
Not designated as hedging instrument [Member]
Derivative [Line Items]
Derivative asset	175.4	42.9
Derivative liability	69.3	146.2
Not designated as hedging instrument [Member] | Commodity contract [Member]
Derivative [Line Items]
Derivative asset	175.4	42.9
Derivative liability	61.4	143.3
Not designated as hedging instrument [Member] | Foreign exchange contract [Member]
Derivative [Line Items]
Derivative asset	0.0	0.0
Derivative liability	7.9	2.9
Glencore [Member] | Commodity contract [Member]
Derivative [Line Items]
Due to affiliate, current	6.8	17.1
Due to affiliate, noncurrent	$ 9.4	$ 21.9

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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