Debt and Financing Obligation (Partnership Financing Obligation) (Details) - Integral Equipment and Mobile Equipment - SunCoke Energy Partners, L.P. - Domestic Coke and Coal Logistics	12 Months Ended
Dec. 31, 2018
Sale Leaseback Transaction [Line Items]
Initial lease period	60 months
Buyout option period	48 months
Percent of original lease equipment cost	34.50%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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