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Debt and Financing Obligations (2025 Senior Notes) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Gain (loss) on extinguishment of debt, net | $ 5,700,000 | $ 1,500,000 | $ (300,000)
Senior notes | Senior Notes, Due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repurchased face value | 62,700,000 |  |
Debt prepayment cost | 55,900,000 |  |
Gain (loss) on extinguishment of debt, net | $ 5,700,000 |  |
SunCoke Energy Partners, L.P. | Senior notes | Senior Notes, Due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of principal amount | 100.00% |  |
Change of control percent | 101.00% |  |
SunCoke Energy Partners, L.P. | Senior notes | Senior Notes, Due 2025 [Member] | On or After June 15, 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage | 35.00% |  |
Percentage of principal amount | 105.60% |  |
SunCoke Energy Partners, L.P. | Senior notes | Senior Notes, Due 2025 [Member] | June 15, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage | 1.90% |  |
SunCoke Energy Partners, L.P. | Senior notes | Senior Notes, Due 2025 [Member] | June 15, 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption percentage | 100.00% |  |

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