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Business Segment Information - Adjusted EBITDA (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Business Acquisition [Line Items]        
Net (loss) income attributable to SunCoke Energy, Inc. $ 3,700,000 $ (152,300,000) $ 26,200,000  
Less: Net income attributable to noncontrolling interests 5,100,000 3,900,000 20,800,000  
Net income (loss) 8,800,000 (148,400,000) 47,000,000.0  
Add:        
Long-lived asset and goodwill impairment 0 247,400,000 0  
Depreciation and amortization expense 133,700,000 143,800,000 141,600,000  
Interest expense, net 56,300,000 60,300,000 61,400,000  
(Gain) loss on extinguishment of debt, net (5,700,000) (1,500,000) 300,000  
Income tax expense (benefit) 10,300,000 (54,700,000) 4,600,000  
Contingent consideration adjustments 0 (4,200,000) 2,500,000  
Restructuring Costs 2,500,000 0 0  
Transaction costs 0 5,200,000 400,000  
Loss from equity method investment 0 0 5,400,000  
Adjusted EBITDA: 205,900,000 247,900,000 263,200,000  
Subtract: Adjusted EBITDA attributable to noncontrolling interest 9,100,000 40,700,000 82,000,000.0  
Adjusted EBITDA attributable to SunCoke Energy, Inc. $ 196,800,000 207,200,000 181,200,000  
Fair Value, Inputs, Level 3 | SunCoke Energy Partners, L.P. | CMT        
Add:        
Contingent consideration   $ 0 $ 5,000,000.0 $ 0