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Debt and Financing Obligations (2025 Senior Notes) (Details) - USD ($)	12 Months Ended
	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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Debt Instrument, Repurchase Percentage, Change of Control

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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