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Debt and Financing Obligation (2025 Senior Notes) (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
(Gain) loss on extinguishment of debt, net   $ (1,500,000) $ 300,000 $ 20,400,000
Senior notes | 7.500 percent senior notes, due 2025 (2025 Senior Notes)        
Debt Instrument [Line Items]        
Repurchased face value $ 50,000,000.0      
Debt prepayment cost $ 46,600,000      
(Gain) loss on extinguishment of debt, net   $ (2,200,000)    
SunCoke Energy Partners, L.P. | Senior notes | 7.500 percent senior notes, due 2025 (2025 Senior Notes)        
Debt Instrument [Line Items]        
Change of control percent   101.00%    
SunCoke Energy Partners, L.P. | Senior notes | 7.500 percent senior notes, due 2025 (2025 Senior Notes) | Before June 15, 2020        
Debt Instrument [Line Items]        
Redemption percentage   35.00%    
Percentage of principal amount   107.50%    
SunCoke Energy Partners, L.P. | Senior notes | 7.500 percent senior notes, due 2025 (2025 Senior Notes) | Anytime prior to June 15, 2020        
Debt Instrument [Line Items]        
Percentage of principal amount   100.00%