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General and Basis of Presentation (Details) | 12 Months Ended
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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

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