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Debt and Financing Obligation - Revolving Facility Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Outstanding balance	$ 506.3	$ 543.8
Revolving Credit Facility | Line of Credit | SunCoke Revolving Credit Facility, Due 2024
Debt Instrument [Line Items]
Outstanding balance	0.0
Remaining borrowing capacity	350.0
Letter of Credit | Line of Credit | SunCoke Revolving Credit Facility, Due 2024
Debt Instrument [Line Items]
Outstanding balance	$ 21.7

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