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Derivatives - Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Due to affiliate, noncurrent	$ 53.5	$ 31.4
Related Party
Derivative [Line Items]
Due to affiliate, current	60.3	17.0
Commodity contracts | Related Party
Derivative [Line Items]
Due from affiliate, current	2.3
Due to affiliate, current	5.6	11.9
Due to affiliate, noncurrent	1.7	8.3
Not designated as hedging instrument
Derivative [Line Items]
Derivative asset	12.4	129.1
Derivative liability	10.4	31.0
Not designated as hedging instrument | Commodity contracts
Derivative [Line Items]
Derivative asset	12.4	129.1
Derivative liability	8.4	23.7
Not designated as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative asset	0.0	0.0
Derivative liability	$ 2.0	$ 7.3

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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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