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Derivative - Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Due to affiliates	$ 65.8	$ 21.7
Due to affiliates - less current portion	21.9	0.1
Commodity Contract | Glencore
Derivative [Line Items]
Due to affiliates	17.1	11.3
Due to affiliates - less current portion	21.9	0.1
Due from affiliate, current		1.2
Due from affiliate, noncurrent		1.7
Not Designated as Hedging Instrument
Derivative [Line Items]
Asset Fair Value	42.9	15.2
Liability Fair Value	146.2	16.7
Not Designated as Hedging Instrument | Commodity Contract
Derivative [Line Items]
Asset Fair Value	42.9	12.8
Liability Fair Value	143.3	16.7
Not Designated as Hedging Instrument | Foreign Exchange Contract
Derivative [Line Items]
Asset Fair Value	0.0	2.4
Liability Fair Value	$ 2.9	$ 0.0

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