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Acquisitions and Divestitures (Simplification Transaction Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 28, 2019
Jun. 27, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Simplification Transaction            
Subsidiary, Sale of Stock [Line Items]            
Outstanding Partnership public units (in shares) 17,727,249          
Units purchased (in shares) 24,818,149          
Quarterly distribution of newly issued shares (in shares) 635,502          
Gain (loss) from transaction       $ 0    
Transaction costs     $ 11,000,000.0   $ 4,900,000 $ 400,000
Legal and consulting costs         300,000  
Simplification Transaction | Additional Paid-In Capital            
Subsidiary, Sale of Stock [Line Items]            
Accrued Simplification Transaction costs     $ 5,400,000   $ 5,400,000  
Suncoke Inc            
Subsidiary, Sale of Stock [Line Items]            
Ownership interest of general partnership   60.40%        
Interest in partnership   2.00%        
Public Unitholders            
Subsidiary, Sale of Stock [Line Items]            
Ownership interest, public   37.60%