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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