| Cover | Oct. 31, 2022 |
| Cover [Abstract] | |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Tax Identification Number | 90-0640593 |
| Soliciting Material | false |
| Document Period End Date | Oct. 31, 2022 |
| Entity Registrant Name | SunCoke Energy, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35243 |
| Entity Address, Address Line One | 1011 Warrenville Road, Suite 600 |
| Entity Address, Postal Zip Code | 60532 |
| Entity Address, State or Province | IL |
| Entity Address, City or Town | Lisle, |
| Local Phone Number | 824-1000 |
| City Area Code | (630) |
| Document Type | 8-K |
| Entity Emerging Growth Company | false |
| Security Exchange Name | NYSE |
| Trading Symbol | SXC |
| Title of 12(b) Security | Common stock, par value $0.01 |
| Written Communications | false |
| Entity Central Index Key | 0001514705 |
| Amendment Flag | false |
