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Business Segment Information (Adjusted EBITDA) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting [Abstract]      
Net income attributable to SunCoke Energy, Inc. $ 100.7 $ 43.4 $ 3.7
Add: Net income attributable to noncontrolling interests 4.2 5.4 5.1
Net income 104.9 48.8 8.8
Add:      
Depreciation and amortization expense 142.5 133.9 133.7
Interest expense, net 32.0 42.5 56.3
Loss (gain) on extinguishment of debt, net 0.0 31.9 (5.7)
Income tax expense 16.8 18.3 10.3
Restructuring costs 0.0 0.0 2.5
Transaction costs 1.5 0.0 0.0
Adjusted EBITDA 297.7 275.4 205.9
Subtract: Adjusted EBITDA attributable to noncontrolling interest 8.4 9.3 9.1
Adjusted EBITDA attributable to SunCoke Energy, Inc. $ 289.3 $ 266.1 $ 196.8