Debt and Financing Obligation (Details Textual)	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2020	Aug. 12, 2018	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Repayment of revolving credit facility					$ 200,000,000	$ 60,400,000
Loss (gain) on extinguishment of debt			$ 20,200,000	$ (3,500,000)	20,300,000	(23,900,000)
Outstanding balance			$ 901,200,000		901,200,000				$ 858,000,000
Proceeds from revolving credit facility					$ 128,000,000	$ 20,000,000
Credit Agreement and Partner Revolver
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio			3.25		3.25
Minimum consolidated interest coverage ratio			2.75		2.75
Credit Agreement and Partner Revolver | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Cross default covenant threshold			$ 35,000,000		$ 35,000,000
Raven Energy LLC Promissory Note | Convent Marine Terminal | Convent Marine Terminal
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio			5		5
Minimum fixed charge coverage ratio			1		1
Raven Energy LLC Promissory Note | Convent Marine Terminal | Forecast | Convent Marine Terminal
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio								4.5
Senior notes | 7.500 percent senior notes, due 2025 (2025 Partnership Notes)
Line of Credit Facility [Line Items]
Interest rate on senior notes (as a percent)			7.50%		7.50%
Outstanding balance			$ 630,000,000		$ 630,000,000				0
Senior notes | 7.500 percent senior notes, due 2025 (2025 Partnership Notes) | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Face amount of debt	$ 630,000,000
Interest rate on senior notes (as a percent)	7.50%
Proceeds from issuance of senior debt	$ 620,600,000
Debt discount	9,400,000
Debt issuance costs, net			$ 11,800,000		$ 11,800,000
Percentage of change of control					101.00%
Percentage of asset dispositions					100.00%
Senior notes | 7.500 percent senior notes, due 2025 (2025 Partnership Notes) | Before June 15, 2020 | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Redemption percentage					35.00%
Percentage of principal amount					107.50%
Senior notes | 7.500 percent senior notes, due 2025 (2025 Partnership Notes) | Anytime prior to June 15, 2020 | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Percentage of principal amount					100.00%
Senior notes | 7.375 percent senior notes, due 2020 (''2020 Partnership Notes'')
Line of Credit Facility [Line Items]
Interest rate on senior notes (as a percent)			7.375%		7.375%
Outstanding balance			$ 0		$ 0				463,000,000
Senior notes | 7.375 percent senior notes, due 2020 (''2020 Partnership Notes'') | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Face amount of debt			463,000,000		463,000,000
Redemption premium			18,700,000
Loss (gain) on extinguishment of debt			19,100,000		19,100,000
Debt issuance costs, gross					7,000,000
Unamortized premium					(6,600,000)
Senior notes | Partnership's promissory note payable, due 2021 (Promissory Note)
Line of Credit Facility [Line Items]
Outstanding balance			112,600,000		112,600,000				113,200,000
Senior notes | Partnership's promissory note payable, due 2021 (Promissory Note) | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Repayments of senior debt			300,000		600,000
Line of Credit | Partnership's term loan, due 2019 (Partnership Term Loan)
Line of Credit Facility [Line Items]
Outstanding balance			0		0				50,000,000
Line of Credit | Partnership's term loan, due 2019 (Partnership Term Loan) | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Repayment of revolving credit facility			50,000,000
Line of Credit | Revolving credit facility | SunCoke's revolving credit facility, due 2018 (Revolving Facility)
Line of Credit Facility [Line Items]
Debt issuance costs, gross					100,000
Reduction of debt		$ 25,000,000
Maximum borrowing capacity		$ 125,000,000
Line of credit debt issuance costs, gross			600,000		600,000
Line of Credit | Revolving credit facility | SunCoke's revolving credit facility, due 2022 (Revolving Facility)
Line of Credit Facility [Line Items]
Maximum borrowing capacity	100,000,000
Line of credit debt issuance costs, gross			1,100,000		1,100,000
Amortization of debt issuance costs			300,000		300,000
Letters of credit outstanding under revolving facility			29,300,000		29,300,000
Outstanding balance			0		0				0
Remaining borrowing capacity			$ 70,700,000		$ 70,700,000
Line of Credit | Revolving credit facility | Partnership's revolving credit facility, due 2018 (Partnership Revolver) | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Maximum borrowing capacity	250,000,000
Maximum consolidated leverage ratio			4.50		4.50
Minimum consolidated interest coverage ratio			2.5		2.5
Line of Credit | Revolving credit facility | Partnership's revolving credit facility, due 2018 (Partnership Revolver) | SunCoke Energy Partners, L.P. | Forecast
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio							4
Line of Credit | Revolving credit facility | Partnership's revolving credit facility, due 2022 and 2019, respectively (Partnership Revolver)
Line of Credit Facility [Line Items]
Outstanding balance			$ 100,000,000		$ 100,000,000				$ 172,000,000
Line of Credit | Revolving credit facility | Partnership's revolving credit facility, due 2022 and 2019, respectively (Partnership Revolver) | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Repayment of revolving credit facility			172,000,000
Maximum borrowing capacity	$ 285,000,000
Line of credit debt issuance costs, gross			3,000,000		3,000,000
Amortization of debt issuance costs			800,000		800,000
Letters of credit outstanding under revolving facility			1,900,000		1,900,000
Outstanding balance			100,000,000		100,000,000
Remaining borrowing capacity			183,100,000		$ 183,100,000
Proceeds from revolving credit facility			$ 100,000,000