Debt (Details Textual) (USD $)	0 Months Ended
	Jan. 13, 2015	Feb. 01, 2015	May 09, 2014	Mar. 31, 2015	Dec. 31, 2014	Apr. 21, 2015
Line of Credit Facility [Line Items]
Interest payable				$ 8,700,000	$ 19,900,000
Senior notes, due 2019
Line of Credit Facility [Line Items]
Long-term debt				105,000,000	240,000,000
Interest rate on senior notes (as a percent)				7.625%	7.625%
Partnership notes, due 2020
Line of Credit Facility [Line Items]
Long-term debt				614,900,000	411,500,000
Original issue premium				14,900,000	11,500,000
Interest rate on senior notes (as a percent)				7.375%	7.375%
Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity				150,000,000
Letters of credit outstanding under revolving facility				1,500,000
Remaining letters of credit agreement amount				148,500,000
SunCoke Energy Partners, L.P. | Partnership notes, due 2020
Line of Credit Facility [Line Items]
Long-term debt			250,000,000
Interest rate on senior notes (as a percent)			7.375%
SunCoke Energy Partners, L.P. | Term loan
Line of Credit Facility [Line Items]
Debt issuance cost	2,200,000
SunCoke Energy Partners, L.P. | Private Placement
Line of Credit Facility [Line Items]
Long-term debt	200,000,000
Proceeds from Issuance of Debt	204,000,000
Original issue premium	4,000,000
Interest Paid		6,800,000.0
Debt issuance cost	5,200,000
Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Redemption premium			11,400,000
Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Partners, L.P. | Term loan
Line of Credit Facility [Line Items]
Long-term debt			271,300,000
Granite City | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Interest payable	5,600,000
Redemption premium	7,700,000
Granite City | SunCoke Energy Partners, L.P. | Term loan
Line of Credit Facility [Line Items]
Long-term debt	135,000,000
Interest rate on senior notes (as a percent)	7.625%
Credit Agreement and Partner Revolver
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio				3.75
Minimum consolidated interest coverage ratio				2.75
Credit Agreement and Partner Revolver | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio				4.0
Minimum consolidated interest coverage ratio				2.5
Total liquidity threshold, at least				75,000,000
Interest Expense | SunCoke Energy Partners, L.P. | Term loan
Line of Credit Facility [Line Items]
Debt issuance cost	700,000
Interest Expense | SunCoke Energy Partners, L.P. | Private Placement
Line of Credit Facility [Line Items]
Debt issuance cost	$ 1,000,000
Subsequent Event | Revolving credit facility | Partnership notes, due 2020
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio						4.00
Subsequent Event | Credit Agreement and Partner Revolver
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio						3.25
Leverage ratio threshold, less than						2.00
Subsequent Event | Credit Agreement and Partner Revolver | SunCoke Energy Partners, L.P.
Line of Credit Facility [Line Items]
Maximum consolidated leverage ratio						4.50