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General and Basis of Presentation (Details)
 12 Months Ended
Dec. 31, 2020
Cokemaking_facility
T
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]  
Coke production experience, more than 60 years
Period that Suncoke constructed the only greenfield cokemaking facilities in the US 30 years
Indiana Harbor  
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]  
Ownership percentage (as a percent) 14.80%
United States  
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]  
Number of facilities | Cokemaking_facility 5
Cokemaking capacity (in tons) 4,200,000
Brazil  
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]  
Number of facilities | Cokemaking_facility 1
Cokemaking capacity (in tons) 1,700,000
Convent, Louisiana, East Chicago, Indiana, West Virginia  
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]  
Coal handling capacity (in tons), more than 40,000,000
Coal storage capacity (in tons) 3,000,000