SunCoke Energy Partners (SXCP) 8-K 30 Apr 15 Other Events Financial data

Document_and_Entity_Informatio

Document and Entity Information	12 Months Ended
	Dec. 31, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	SunCoke Energy Partners, L.P.
Entity Central Index Key	1555538
Document Type	8-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE

Combined_and_Consolidated_Stat

Combined and Consolidated Statements of Income (USD $)	12 Months Ended
Share data in Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Sales and other operating revenue	$873,000,000	$931,700,000
Costs and operating expenses
Cost of products sold and operating expenses	656,300,000	715,400,000
Selling, general and administrative expenses	27,300,000	28,300,000
Depreciation and amortization expense	54,300,000	46,600,000	46,400,000
Total costs and operating expenses	737,900,000	790,300,000
Operating income	135,100,000	141,400,000
Interest expense, net	37,100,000	15,400,000	10,300,000
Income before income tax expense	98,000,000	126,000,000
Income tax expense	10,500,000	1,800,000	23,300,000
Net income	87,500,000	124,200,000	82,800,000
Less: Net income attributable to noncontrolling interests	15,700,000	40,800,000
Net income attributable to SunCoke Energy Partners L.P.	71,800,000	83,400,000
General partner's interest in net income	18,200,000	26,400,000
Limited partners' interest in net income	53,600,000	57,000,000
Common Units
Costs and operating expenses
Net income per common unit (basic and diluted), in dollars per share	1.58	1.81
Weighted average units outstanding (basic and diluted) (in shares)	19.7	15.7
Subordinated Units
Costs and operating expenses
Net income per subordinated unit (basic and diluted), in dollars per share	1.43	1.81
Weighted average units outstanding (basic and diluted) (in shares)	15.7	15.7
Predecessor
Revenues
Sales and other operating revenue			1,013,900,000
Costs and operating expenses
Cost of products sold and operating expenses			821,100,000
Selling, general and administrative expenses			30,000,000
Depreciation and amortization expense			46,400,000
Total costs and operating expenses			897,500,000
Operating income			116,400,000
Interest expense, net			10,300,000
Income before income tax expense			106,100,000
Income tax expense	9,300,000	1,000,000	23,300,000
Net income			82,800,000
Less: Net income attributable to noncontrolling interests			0
Net income attributable to SunCoke Energy Partners L.P.	15,800,000	24,800,000	82,800,000
General partner's interest in net income	15,800,000	24,800,000
Successor
Costs and operating expenses
Income tax expense	1,200,000	800,000	0
Net income	87,500,000	124,200,000
Net income attributable to SunCoke Energy Partners L.P.	$56,000,000	$58,600,000	$0

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets
Cash and cash equivalents	$33.30	$46.30
Receivables	36.3	26.2
Receivables from affiliates, net	3.1	6.4
Inventories	90.4	81
Other current assets	1.5	1.7
Total current assets	164.6	161.6
Properties, plants and equipment, net	1,213.40	1,199.70
Goodwill and other intangible assets, net	15.1	16
Deferred income taxes	21.6	32
Deferred charges and other assets	2.3	0
Total assets	1,417	1,409.30
Liabilities and Equity
Accounts payable	61.1	79.4
Accrued liabilities	11.2	24.6
Short-term debt	0	40
Interest payable	12.3	4.6
Total current liabilities	84.6	148.6
Long-term debt	399	143.2
Other deferred credits and liabilities	6.7	5.7
Total liabilities	490.3	297.5
Equity
Equity	915.6	927.6
Noncontrolling interest	11.1	184.2
Total equity	926.7	1,111.80
Total liabilities and equity	1,417	1,409.30
General Partner
Equity
Equity	9.2	8.3
Common Units - Public
Equity
Equity	239.1	240.8
Common Units - Parent
Equity
Equity	113.8	41
Subordinated Units
Equity
Equity	203.7	290.4
Predecessor | Parent
Equity
Equity	349.8	347.1
Total equity	$349.80	$347.10

Combined_and_Consolidated_Bala

Combined and Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2014	Dec. 31, 2013
Common Units - Public
Limited partners' capital account units issued (in units)	16,789,164	13,503,456
Common Units - Parent
Limited partners' capital account units issued (in units)	4,904,752	2,209,697
Subordinated Units
Limited partners' capital account units issued (in units)	15,709,697	15,709,697

Combined_and_Consolidated_Stat1

Combined and Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income	$87,500,000	$124,200,000	$82,800,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	54,300,000	46,600,000	46,400,000
Deferred income tax expense	10,500,000	1,800,000	23,300,000
Loss on extinguishment/modification of debt	15,400,000	0	0
Changes in working capital pertaining to operating activities:
Receivables	-10,100,000	-24,000,000	-2,300,000
Receivables from affiliate, net	3,300,000	-6,400,000	0
Inventories	-9,400,000	14,700,000	8,100,000
Accounts payable	-18,400,000	22,600,000	-37,600,000
Accrued liabilities	-13,300,000	-23,800,000	8,700,000
Interest payable	7,700,000	4,600,000	0
Other	-1,000,000	5,500,000	900,000
Net cash provided by operating activities	126,500,000	165,800,000	130,300,000
Cash Flows from Investing Activities:
Capital expenditures	-67,600,000	-46,200,000	-22,800,000
Acquisitions of business, net of cash acquired	0	-113,300,000	0
Net cash used in investing activities	-67,600,000	-159,500,000	-22,800,000
Cash Flows from Financing Activities:
Proceeds from issuance of common units, net of offering costs	90,500,000	231,800,000	0
Proceeds from issuance of long-term debt	268,100,000	150,000,000	0
Repayment of long-term debt	-276,300,000	-225,000,000	0
Debt issuance costs	-5,800,000	-6,800,000	0
Proceeds from revolving credit facility	40,000,000	40,000,000	0
Repayment of revolving credit facility	-80,000,000	0	0
Distributions to unitholders (public and parent)	-74,700,000	-37,200,000	0
Distributions to noncontrolling interest (SunCoke Energy, Inc.)	-20,900,000	-82,900,000	0
Capital contribution from SunCoke Energy Partners GP LLC	300,000	900,000	0
Net cash (used in) provided by financing activities	-71,900,000	40,000,000	-107,500,000
Net (decrease) increase in cash and cash equivalents	-13,000,000	46,300,000	0
Cash and cash equivalents at beginning of year	46,300,000	0	0
Cash and cash equivalents at end of year	33,300,000	46,300,000	0
Predecessor
Cash Flows from Operating Activities:
Net income			82,800,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense			46,400,000
Cash Flows from Financing Activities:
Net transfers to parent	-13,100,000	-30,800,000	-107,500,000
Cash and cash equivalents at beginning of year		0
Cash and cash equivalents at end of year			$0

Combined_and_Consolidated_Stat2

Combined and Consolidated Statements of Equity (USD $)	Total	Common - Public	Common - SunCoke	Subordinated - SunCoke	Common - Public	SunCoke Energy Inc	SunCoke Energy Inc	General Partner - SunCoke	Non- controlling Interest	Predecessor	Predecessor	Predecessor	Predecessor	Predecessor	Predecessor	Predecessor	Successor	Successor	Successor	Successor	Successor	Successor	Haverhill Coke Company LLC and Middletown Coke Company LLC	Haverhill Coke Company LLC and Middletown Coke Company LLC	Haverhill Coke Company LLC and Middletown Coke Company LLC	Haverhill Coke Company LLC and Middletown Coke Company LLC	Haverhill Coke Company LLC and Middletown Coke Company LLC
In Millions, unless otherwise specified						Common - SunCoke	Subordinated - SunCoke				Parent	Common - Public	SunCoke Energy Inc	SunCoke Energy Inc	General Partner - SunCoke	Non- controlling Interest		Common - Public	SunCoke Energy Inc	SunCoke Energy Inc	General Partner - SunCoke	Non- controlling Interest	Predecessor	Predecessor	Predecessor	Predecessor	Predecessor
													Common - SunCoke	Subordinated - SunCoke					Common - SunCoke	Subordinated - SunCoke			Parent	SunCoke Energy Inc	SunCoke Energy Inc	General Partner - SunCoke	Non- controlling Interest
																								Common - SunCoke	Subordinated - SunCoke
Balance, Beginning of period at Dec. 31, 2011										$983	$983	$0	$0	$0	$0	$0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	82.8									82.8	82.8
Net decrease in parent net equity										-107.5	-107.5
Balance, end of period at Dec. 31, 2012										958.3	958.3	0	0	0	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	124.2										24.8						124.2	24.5	4	28.5	1.6	40.8
Net decrease in parent net equity	-30.8										-30.8
Pre-IPO predecessor net assets not assumed by SunCoke Energy Partners, L.P.										-52.6	-52.6
Allocation of net parent investment																							-359.3	43.5	308.6	7.2
SunCoke Energy, Inc. percent retained interest																							-193.3				193.3
Proceeds from equity issuance to public unitholders	231.8				231.8
Unit-based compensation expense																	0.1	0.1
Capital contribution from SunCoke Energy Partners GP LLC																	0.9				0.9
Distributions to SunCoke Energy, Inc.	-37.2				-15.6	-2.6	-18.2	-0.8									-82.9		-3.9	-28.5	-0.6	-49.9
Balance, end of period	1,111.80										347.1						1,111.80	240.8	41	290.4	8.3	184.2
Balance, end of period at Dec. 31, 2013	927.6	240.8	41	290.4				8.3			347.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	87.5										15.8						87.5	23.8	6.2	23.6	2.4	15.7
Net decrease in parent net equity	-13.1							0			-13.1											0
Pre-IPO predecessor net assets not assumed by SunCoke Energy Partners, L.P.	-17.5																					-17.5
Proceeds from equity issuance to public unitholders	90.5				90.5
Issuances of units	83.3					80		3.3
Cash payment	-3.4				-1.6	-0.2	-1.5	-0.1
Adjustments to equity related to the acquisition	-338				-82.1	-4.6	-77.1	-2.9	-171.3
Capital contribution from SunCoke Energy Partners GP LLC	0.3							0.3
Distributions to SunCoke Energy, Inc.	-74.7				-32.3	-8.6	-31.7	-2.1
Balance, end of period	926.7										349.8						926.7	239.1	113.8	203.7	9.2	11.1
Balance, end of period at Dec. 31, 2014	$915.60	$239.10	$113.80	$203.70				$9.20			$349.80

Combined_and_Consolidated_Stat3

Combined and Consolidated Statements of Equity (Parenthetical) (IPO)	Dec. 31, 2014
Haverhill Coke Company LLC and Middletown Coke Company LLC
Interest in Partnership (as a percent)	65.00%
Sun Coal & Coke
Interest in Partnership (as a percent)	35.00%

General

General	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	1. General
	Description of Business and Basis of Presentation
	SunCoke Energy Partners, L.P., (the "Partnership", "we", "our", and "us"), is a Delaware limited partnership formed in July 2012, which primarily manufactures coke used in the blast furnace production of steel. On January 24, 2013, we completed the initial public offering ("IPO") of our common units representing limited partner interests. In connection with the IPO, we acquired from SunCoke Energy, Inc. ("SunCoke") a 65 percent interest in each of Haverhill Coke Company LLC ("Haverhill") and Middletown Coke Company, LLC ("Middletown") and the cokemaking facilities and related assets held by Haverhill and Middletown. On May 9, 2014, we completed the acquisition of an additional 33 percent interest in the Haverhill and Middletown cokemaking facilities for a total transaction value of $365.0 million. See Note 4. At December 31, 2014, SunCoke owns the remaining 2 percent interest in each of Haverhill and Middletown, and, through its subsidiary, owns a 54.0 percent partnership interest in us and all of our incentive distribution rights and indirectly owns and controls our general partner, which holds a 2.0 percent general partner interest in us.
	On January 13, 2015, the Partnership acquired a 75 percent interest in SunCoke's Gateway Energy and Coke Company, LLC ("Granite City") cokemaking facility for a total transaction value of $245.0 million (the "Granite City Dropdown"). The remaining 25 percent interest continues to be owned by SunCoke. See Note 4. Subsequent to the Granite City Dropdown, SunCoke, through its subsidiary, owns a 56.1 percent partnership interest in us and all of our incentive distribution rights and indirectly owns and controls our general partner, which holds a 2.0 percent general partner interest in us. As discussed further below, the Granite City Dropdown was a transfer of a business between entities under common control. Accordingly, our historical financial information has been retrospectively adjusted to include Granite City’s historical results and financial position for all periods presented.
	Coke is a principal raw material in the blast furnace steelmaking process. Coke is generally produced by heating metallurgical coal in a refractory oven, which releases certain volatile components from the coal, thus transforming the coal into coke. Our cokemaking ovens utilize efficient, modern heat recovery technology designed to combust the coal’s volatile components liberated during the cokemaking process and use the resulting heat to create steam or electricity for sale. This differs from by-product cokemaking which seeks to repurpose the coal’s liberated volatile components for other uses. We believe that heat recovery technology has several advantages over the alternative by-product cokemaking process, including producing higher quality coke, using waste heat to generate steam or electricity for sale and reducing environmental impact. We license this advanced heat recovery cokemaking process from SunCoke.
	The Granite City facility and the first phase of the Haverhill facility, or Haverhill 1, have steam generation facilities which use hot flue gas from the cokemaking process to produce steam for sale to customers pursuant to steam supply and purchase agreements. Granite City and Haverhill 1 sell steam to third-parties. The Middletown facility and the second phase of the Haverhill facility, or Haverhill 2, have cogeneration plants that use the hot flue gas created by the cokemaking process to generate electricity, which is either sold into the regional power market or to AK Steel pursuant to energy sales agreements.
	We also provide coal handling and blending services with our Coal Logistics business. Our terminal located in East Chicago, Indiana, SunCoke Lake Terminal, LLC ("Lake Terminal") provides coal handling and blending services to SunCoke's Indiana Harbor cokemaking operations. Kanawha River Terminals ("KRT") is a leading metallurgical and thermal coal blending and handling terminal service provider with collective capacity to blend and transload 30 million tons of coal annually through its operations in West Virginia and Kentucky. Coal is transported from the mine site in numerous ways, including rail, truck, barge or ship. Our coal terminals act as intermediaries between coal producers and coal end users by providing transloading, storage and blending services. We do not take possession of coal in our Coal Logistics business, but instead earn revenue by providing coal handling and blending services to our customers on a fee per ton basis. We provide blending and handling services to steel, coke (including some of our domestic cokemaking facilities), electric utility and coal producing customers. See Note 4.
	The Granite City Dropdown was a transfer of a business between entities under common control, which is required to be accounted for as if the transfer occurred at the beginning of the period of transfer. Prior periods have been retrospectively adjusted to furnish comparative information.  Accordingly, the accompanying financial statements and notes have been retrospectively adjusted to include the historical results and financial position of Granite City. See Note 4.
	The combined financial statements for periods prior to the IPO are the results of our predecessor for accounting purposes and include the operations of Haverhill, Middletown and Granite City. We refer to our pre-IPO predecessor and the operations of Granite City prior to the Granite City Dropdown on January 13, 2015 collectively as our “Predecessors.” The combined financial statements of our Predecessors reflect the combined historical results of operations, financial position and cash flows of our Predecessors as if such businesses had been combined for all periods presented and were prepared using SunCoke’s historical basis in the assets and liabilities of the Predecessors. The combined financial statements include all revenues, costs, assets and liabilities attributed to the Predecessors after the elimination of all intercompany accounts and transactions.
	All financial information presented for the periods after the IPO represents the consolidated results of operations, financial position and cash flows of the Partnership giving retrospective effect to the combined results of operations, financial position and cash flows of the Granite City operations. Accordingly:
	•	Our combined and consolidated statements of income and cash flows for the years ended December 31, 2014 and 2013 consists of the consolidated results of the Partnership for the period from January 24, 2013 through December 31, 2014, the combined results of our pre-IPO predecessor for the period from January 1, 2013 through January 24, 2013, and the combined results of Granite City for the entire years of 2013 and 2014.  Our combined statements of income and cash flows for the year ended December 31, 2012 consists entirely of the combined activity of our Predecessors.
	•	Our combined and consolidated balance sheet at December 31, 2014 and 2013 consists of the consolidated balances of the Partnership and the combined balances of Granite City.
	•	Our combined and consolidated statement of equity for the years ended December 31, 2014 and 2013 consists of the consolidated activity of the Partnership completed at and subsequent to the IPO on January 24, 2013 through December 31, 2014, the combined activity of our pre-IPO predecessor for the period from January 1, 2013 through January 24, 2013, and the combined activity of Granite City for the entire years of 2013 and 2014.  Our combined statement of equity for the year ended December 31, 2012 consists entirely of the combined activity of our Predecessors.
	Prior to their acquisitions by the Partnership, the Predecessors participated in centralized financing and cash management programs not maintained at the Predecessors’ levels. Accordingly, none of SunCoke’s cash or interest income has been assigned to the Predecessors in the combined financial statements. Advances between the Predecessors and SunCoke that are specifically related to the Predecessors have been reflected in the combined financial statements. Transfers of cash to and from SunCoke’s financing and cash management program are reflected as a component of parent net equity on the Combined and Consolidated Balance Sheets. The Granite City Dropdown did not impact historical earnings per unit as pre-acquisition earnings were allocated to our general partner.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]
Significant of Significant Accounting Policies	2. Summary of Significant Accounting Policies
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the combined and consolidated financial statements and accompanying notes. Actual amounts could differ from these estimates.
	Revenue Recognition
	The Partnership sells coke as well as steam and electricity and also provides coal blending and handling services to third-party customers. Revenues related to the sale of products are recognized when title passes, while service revenues are recognized when services are provided as defined by customer contracts. Revenues are not recognized until sales prices are fixed or determinable and collectability is reasonably assured.
	Substantially all of the coke produced by the Partnership is sold pursuant to long-term contracts with its customers. The Partnership evaluates each of its contracts to determine whether the arrangement contains a lease under the applicable accounting standards. If the specific facts and circumstances indicate that it is remote that parties other than the contracted customer will take more than a minor amount of the coke that will be produced by the property, plant and equipment during the term of the coke supply agreement, and the price that the customer is paying for the coke is neither contractually fixed per unit nor equal to the current market price per unit at the time of delivery, then the long-term contract is deemed to contain a lease. The lease component of the price of coke represents the rental payment for the use of the property, plant and equipment, and all such payments are accounted for as contingent rentals as they are only earned by the Partnership when the coke is delivered and title passes to the customer. The total amount of revenue recognized by the Partnership for these contingent rentals represents less than 10 percent of sales and other operating revenues for each of the years ended December 31, 2014, 2013 and 2012.
	Cash Equivalents
	The Partnership considers all highly liquid investments with a remaining maturity of three months or less at the time of purchase to be cash equivalents. These cash equivalents consist principally of time deposits and money market investments.
	Inventories
	Inventories are valued at the lower of cost or market. Cost is determined using the first-in, first-out method, except for materials and supplies inventory, which are determined using the average-cost method.
	The Partnership utilizes the selling prices under its long-term coke supply contracts to record lower of cost or market inventory adjustments.
	Properties, Plants and Equipment, Net
	Plants and equipment are depreciated on a straight-line basis over their estimated useful lives. Coke and energy plant, machinery and equipment are depreciated over 25 to 30 years. Coal logistics plant and equipment are depreciated over 15 to 20 years. Depreciation is excluded from cost of products sold and operating expenses and is presented separately in the Combined and Consolidated Statements of Income. Gains and losses on the disposal or retirement of fixed assets are reflected in earnings when the assets are sold or retired. Amounts incurred that extend an asset’s useful life, increase its productivity or add production capacity are capitalized. The Company has recorded capitalized interest costs related to its environmental remediation project (see Note 15) of $3.2 million, $1.0 million, and $0.1 million for the years ended December 31, 2014, 2013 and 2012, respectively. Direct costs, such as outside labor, materials, internal payroll and benefits costs, incurred during the construction of a new facility are capitalized; indirect costs are not capitalized. Normal repairs and maintenance costs are expensed as incurred.
	Asset Retirement Obligations
	The fair value of a liability for an asset retirement obligation is recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. The associated asset retirement costs are capitalized as part of the carrying amount of the asset and depreciated over its remaining estimated useful life. At December 31, 2014 and 2013, the Predecessors had asset retirement obligations of $5.3 million and $4.9 million, respectively, primarily related to costs associated with restoring land to its original state, which are included in other deferred credits and liabilities on the Combined and Consolidated Balance Sheet.
	Impairment of Long-Lived Assets
	Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Such events and circumstances include, among other factors: operating losses; unused capacity; market value declines; changes in the expected physical life of an asset; technological developments resulting in obsolescence; changes in demand for our products or in end-use goods manufactured by others utilizing our products as raw materials; changes in our business plans or those of our major customers, suppliers or other business partners; changes in competition and competitive practices; uncertainties associated with the U.S. and world economies; changes in the expected level of capital, operating or environmental remediation project expenditures; and changes in governmental regulations or actions.
	A long-lived asset is considered to be impaired when the undiscounted net cash flows expected to be generated by the asset are less than its carrying amount. Such estimated future cash flows are highly subjective and are based on numerous assumptions about future operations and market conditions. The impairment recognized is the amount by which the carrying amount exceeds the fair market value of the impaired asset. It is also difficult to precisely estimate fair market value because quoted market prices for our long-lived assets may not be readily available. Therefore, fair market value is generally based on the present values of estimated future cash flows using discount rates commensurate with the risks associated with the assets being reviewed for impairment. We have had no significant asset impairments during the years ended December 31, 2014, 2013 and 2012.
	Goodwill and Other Intangibles
	Goodwill, which represents the excess of the purchase price over the fair value of net assets acquired, is tested for impairment at least annually during the fourth quarter. All other intangible assets have finite useful lives and are amortized over their useful lives in a manner that reflects the pattern in which the economic benefit of the intangible asset is consumed. There was no impairment of goodwill or other intangibles during the periods presented. See Note 12.
	Shipping and Handling Costs
	Shipping and handling costs are included in cost of products sold and operating expenses.
	Fair Value Measurements
	The Partnership determines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As required, the Partnership utilizes valuation techniques that maximize the use of observable inputs (levels 1 and 2) and minimize the use of unobservable inputs (level 3) within the fair value hierarchy included in current accounting guidance. The Partnership generally applies the “market approach” to determine fair value. This method uses pricing and other information generated by market transactions for identical or comparable assets and liabilities. Assets and liabilities are classified within the fair value hierarchy based on the lowest level (least observable) input that is significant to the measurement in its entirety.
	Recently Issued Pronouncements
	In April 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-03, "Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Cost." ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Company early adopted this ASU during the first quarter of 2015. See Note 14.
	In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis." ASU 2015-02 eliminates the deferral of FASB Statement No. 167, "Amendments to FASB Interpretation No. 46(R)," and makes changes to both the variable interest model and the voting model. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Company does not expect this ASU to have a material effect on the Company's financial condition, results of operations, or cash flows.
	In January 2015, the FASB issued ASU 2015-01, "Income Statement—Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items". ASU 2015-01 eliminates the concept of extraordinary items from GAAP. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, or cash flows.
	In November 2014, the FASB issued ASU 2014-16, "Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or to Equity". ASU 2014-16 provides guidance to entities about how to determine the nature of the host contract by considering all terms and features of the hybrid financial instrument. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, or cash flows.
	In November 2014, the FASB issued ASU 2014-17, "Business Combinations (Topic 805): Pushdown Accounting". ASU 2014-17 provides guidance on whether and at what threshold an acquired entity can apply pushdown accounting in its separate financial statements. It is effective on November 18, 2014. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, or cash flows.
	In August 2014, the FASB issued ASU 2014-15, "Presentation of Financial Statements-Going Concern". This ASU is intended to define management's responsibility to evaluate whether there is substantial doubt about an organization's ability to continue as a going concern and to provide related footnote disclosures. It is effective for annual periods beginning after December 15, 2016, with early adoption permitted. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, and cash flows.
	In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which provides guidance for revenue recognition. Under this ASU, an entity is required to recognize revenue upon transfer of promised goods or services to customers, in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services.  The guidance also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from the customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. This ASU is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. The Partnership is currently reviewing the provisions of ASU 2014-09 but does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, and cash flows.
	In April 2014, FASB issued ASU 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity." ASU 2014-08 raises the threshold for a disposal to qualify as a discontinued operation and requires new disclosures of both discontinued operations and certain other disposals that do not meet the definition of a discontinued operation. It is effective for annual periods beginning on or after December 15, 2014 with early adoption permitted. The application of this guidance is prospective from the date of adoption and applies only to disposals (or new classifications to held for sale) that have not been reported as discontinued operations in previously issued financial statements. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, and cash flows.
	Labor Concentrations
	We are managed and operated by the officers of our general partner. Our operating personnel are employees of our operating subsidiaries. Our operating subsidiaries, including Granite City, had approximately 562 employees at December 31, 2014. Approximately 35 percent of our operating subsidiaries' employees are represented by the United Steelworkers. Additionally, approximately 5 percent are represented by the International Union of Operating Engineers. The labor agreement at the Haverhill cokemaking facility expires on October 31, 2015. We will be working on the renewal of this agreement in 2015 and do not anticipate any work stoppages.

Initial_Public_Offering

Initial Public Offering	12 Months Ended
	Dec. 31, 2014
Initial Public Offering [Abstract]
Initial Public Offering	3. Initial Public Offering
	Initial Public Offering
	On January 23, 2013, in anticipation of the closing of the IPO, we entered into a contribution agreement with Sun Coal & Coke, a subsidiary of SunCoke, and our general partner (the "Contribution Agreement"). Pursuant to the Contribution Agreement, upon the closing of the IPO on January 24, 2013, Sun Coal & Coke contributed to us an interest in each of Haverhill and Middletown which resulted in our owning a 65 percent interest in each of Haverhill and Middletown. In exchange, our general partner continued to hold a 2.0 percent general partner interest in us and we issued to our general partner incentive distribution rights ("IDRs") in us. We also issued to Sun Coal & Coke 2,209,697 common units and 15,709,697 subordinated units.
	In conjunction with the closing of the IPO, we sold 13,500,000 common units, representing a 42.1 percent partnership interest, to the public at an initial public offering price of $19.00 per common unit. Gross proceeds from the offering were approximately $256.5 million and net proceeds were approximately $231.8 million after deducting underwriting discounts and offering expenses of $24.7 million, $6.0 million of which were paid by SunCoke in 2012 and reimbursed by us upon the closing of the IPO. We assumed and repaid $225.0 million of SunCoke's term loan debt, and we retained $67.0 million for environmental remediation project expenditures of Haverhill and Middletown, $12.4 million for sales discounts related to tax credits owed to customers of Haverhill, and $39.6 million to replenish our working capital. We used a portion of the net proceeds from the IPO and the concurrent issuance and sale of senior notes discussed below to make a distribution of $33.1 million to SunCoke to, in effect, reimburse SunCoke for expenditures made during the two-year period prior to the IPO for the expansion and improvement of certain assets, an interest in which SunCoke contributed to us in connection with the IPO pursuant to the Contribution Agreement described above.
	Concurrent with the closing of the IPO, we and SunCoke Energy Partners Finance Corp., a Delaware corporation and a wholly owned subsidiary of ours, as co-issuers, issued $150.0 million aggregate principal amount of 7.375 percent senior notes ("Partnership Notes") due in 2020 in a private placement to eligible purchasers. The Partnership Notes are the senior unsecured obligations of the co-issuers and are guaranteed on a senior unsecured basis by each of our existing and certain future subsidiaries other than SunCoke Energy Partners Finance Corp. We received net proceeds of approximately $146.3 million, net of debt issuance costs of $3.7 million, from the offering of the Partnership Notes. We also incurred $2.2 million of debt issuance costs related to entering into a revolving credit facility. See Note 14.
	Omnibus Agreement
	In connection with the closing of the IPO, we entered into an omnibus agreement with SunCoke and our general partner that addresses certain aspects of our relationship with them, including:
	Business Opportunities. We have preferential rights to invest in, acquire and construct cokemaking facilities in the United States ("U.S.") and Canada. SunCoke has preferential rights to all other business opportunities.
	Potential Defaults by Coke Agreement Counterparties. For a period of five years from the closing date of the IPO, SunCoke has agreed to make us whole (including an obligation to pay for coke) to the extent (i) AK Steel exercises the early termination right provided in its Haverhill coke sales agreement, (ii) any customer fails to purchase coke or defaults in payment under its coke sales agreement (other than by reason of force majeure or our default) or (iii) we amend a coke sales agreement's terms to reduce a customer's purchase obligation as a result of the customer's financial distress. We and SunCoke will share in any damages and other amounts recovered from third parties arising from such events in proportion to our relative losses.
	During 2013, SunCoke cooperated with AK Steel on its projected second half of 2013 coke needs after a blast furnace outage at their Middletown plant in the second quarter of 2013. Specifically, due to this outage, SunCoke agreed to manage production at the Haverhill cokemaking facility to be consistent with annual contract maximums and to temporarily scale back coke production at the Middletown facility to name plate capacity levels in the second half of 2013. As a result, pursuant to this omnibus agreement, SunCoke, through the general partner, made capital contributions of $0.9 million to us during 2013.
	Environmental Indemnity. SunCoke will indemnify us to the full extent of any remediation at the Haverhill and Middletown cokemaking facilities arising from any environmental matter discovered and identified as requiring remediation prior to the closing of the IPO. SunCoke contributed $67.0 million in partial satisfaction of this obligation from the proceeds of the IPO and an additional $7.0 million in connection with the Haverhill and Middletown Dropdown. See Note 4. SunCoke also has agreed to indemnify us to the full extent of any required remediation at the Granite City cokemaking facility arising from any environmental matter discovered and identified as requiring remediation prior to the Granite City Dropdown. SunCoke has contributed $45.0 million in partial satisfaction of this obligation. See Note 4. If, prior to the fifth anniversary of the closing of the IPO, a pre-existing environmental matter is identified as requiring remediation, SunCoke will indemnify us for up to $50.0 million of any such remediation costs (we will bear the first $5.0 million of any such costs).
	Other Indemnification. SunCoke will fully indemnify us with respect to any additional tax liability related to periods prior to or in connection with the closing of the IPO or the Granite City Dropdown to the extent not currently presented on the combined and consolidated balance sheet. Additionally, SunCoke will either cure or fully indemnify us for losses resulting from any material title defects at the properties owned by the entities acquired in connection with the closing of the IPO or the Granite City Dropdown to the extent that those defects interfere with or could reasonably be expected to interfere with the operations of the related cokemaking facilities. We will indemnify SunCoke for events relating to our operations except to the extent that we are entitled to indemnification by SunCoke.
	License. SunCoke has granted us a royalty-free license to use the name “SunCoke” and related marks. Additionally, SunCoke has granted us a non-exclusive right to use all of SunCoke's current and future cokemaking and related technology. We have not paid and will not pay a separate license fee for the rights we receive under the license.
	Expenses and Reimbursement. SunCoke will continue to provide us with certain corporate and other services, and we will reimburse SunCoke for all direct costs and expenses incurred on our behalf and a portion of corporate and other costs and expenses attributable to our operations. Additionally, we paid all fees in connection with our senior notes offering and our revolving credit facility and have agreed to pay all additional fees in connection with any future financing arrangement entered into for the purpose of replacing credit facility or the senior notes.
	So long as SunCoke controls our general partner, the omnibus agreement will remain in full force and effect unless mutually terminated by the parties. If SunCoke ceases to control our general partner, the omnibus agreement will terminate, but our rights to indemnification and use of SunCoke's existing cokemaking and related technology will survive. The omnibus agreement can be amended by written agreement of all parties to the agreement, but we may not agree to any amendment that would, in the reasonable discretion of our general partner, be adverse in any material respect to the holders of our common units without prior approval of the conflicts committee.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions	4. Acquisitions
	Granite City Dropdown
	On January 13, 2015, the Partnership acquired a 75 percent interest in SunCoke's Gateway Energy and Coke Company, LLC ("Granite City") cokemaking facility for a total transaction value of $245.0 million (the "Granite City Dropdown"). The remaining 25 percent interest continues to be owned by SunCoke. The Granite City cokemaking facility, which began operations in 2009, has annual cokemaking capacity of 650 thousand tons and produces super-heated steam for power generation. Both the coke and power are provided to U.S. Steel under a long-term take-or-pay contract that expires in 2025. In connection with this agreement, the Partnership issued common units totaling approximately $50.7 million and $1.0 million of general partner interests to SunCoke. In addition, the Partnership assumed and repaid $135.0 million principal amount of SunCoke’s outstanding 7.625 percent senior notes and paid $5.6 million of accrued interest and $7.7 million of redemption premium in connection therewith. To fund this debt assumption and redemption, the Partnership issued $200.0 million of add-on 7.375 percent unsecured senior notes. The remaining cash of $45.0 million was used to pre-fund SunCoke’s obligation to indemnify the Partnership for the anticipated cost of an environmental project at Granite City, pay transaction costs, and for general partnership purposes. The Granite City Dropdown was a transfer of businesses between entities under common control. Accordingly, our historical financial information has been retrospectively adjusted to include Granite City’s historical results and financial position for all periods presented.
	Haverhill and Middletown Dropdown
	On May 9, 2014, we completed the acquisition of an additional 33 percent interest in the Haverhill and Middletown cokemaking facilities for a total transaction value of $365.0 million (the "Haverhill and Middletown Dropdown"). The terms of the contribution agreement and the acquisition of the interests in Haverhill and Middletown were approved by the conflicts committee of our general partner’s Board of Directors, which consists entirely of independent directors.
	The results of the Haverhill and Middletown operations are consolidated in the combined and consolidated financial statements of the Partnership for all periods presented and any interest in the Haverhill and Middletown operations retained by Sun Coal & Coke is recorded as a noncontrolling interest of the Partnership. Sun Coal & Coke retained a 35 percent interest in Haverhill and Middletown prior to the dropdown and a 2 percent interest in Haverhill and Middletown subsequent to the dropdown. We accounted for the Haverhill and Middletown Dropdown as an equity transaction, which resulted in a $171.3 million reduction to noncontrolling interest for the additional 33 percent interest acquired by the Partnership. Partnership equity was decreased for the difference between the consideration discussed below and the $171.3 million of noncontrolling interest acquired.
	Total transaction value for the Haverhill and Middletown Dropdown included $3.4 million of cash to SunCoke, 2.7 million common units totaling $80.0 million issued to SunCoke and $3.3 million of general partner interests issued to SunCoke. We retained $7.0 million of the transaction value to pre-fund SunCoke’s obligation to indemnify us for the anticipated cost of the environmental remediation project at Haverhill, which did not impact Partnership equity. In addition, we assumed and repaid approximately $271.3 million of outstanding SunCoke debt and other liabilities, which included a market premium of $11.4 million to complete the tender of certain debt. The market premium was included in Partnership net income. In conjunction with the assumption of this debt, the Partnership also assumed the related debt issuance costs and debt discount, which were included in the adjustments to equity related to the acquisition in the Combined and Consolidated Statement of Equity.
	We funded the Haverhill and Middletown Dropdown with $88.7 million of net proceeds from the sale of 3.2 million common units to the public, which was completed on April 30, 2014, and approximately $263.1 million of gross proceeds from the issuance of $250.0 million aggregate principal amount of 7.375 percent Partnership Notes due in 2020 through a private placement on May 9, 2014. In conjunction with the new senior notes, the Partnership incurred debt issuance costs of $4.9 million, $0.9 million of which was considered a modification of debt and was included in other operating cash flows in the Combined and Consolidated Statement of Cash Flows with the remainder included in financing cash flows. In addition, the Partnership received $5.0 million to fund interest from February 1, 2014 to May 9, 2014, the period prior to the issuance. This interest was paid to noteholders on August 1, 2014.
	As Haverhill and Middletown were consolidated both prior to and subsequent to the Haverhill and Middletown Dropdown, the only impact on our Combined and Consolidated Statement of Cash Flows was the related financing activities discussed above.
	In conjunction with the closing of the Haverhill and Middletown Dropdown, the Partnership also increased its revolving credit facility by an additional $100.0 million to $250.0 million and extended its maturity date from January 2018 to May 2019. The Partnership paid $1.8 million in fees related to the revolving credit facility amendment, which were included in financing cash flows in the Combined and Consolidated Statement of Cash Flows. See Note 14.
	The table below summarizes the effects of the changes in the Partnership’s ownership interest in Haverhill and Middletown on the Partnership’s equity.
		Year Ended December 31, 2014
		(Dollars in millions)
	Net income attributable to SunCoke Energy Partners, L.P.	56
	Change in SunCoke Energy Partners, L.P. partnership equity for the purchase of an additional 33.0 percent interest in Haverhill and Middletown	(170.1		)
	Change from net income attributable to SunCoke Energy Partners, L.P. and transfers to noncontrolling interest	$	(114.1	)
	SunCoke Lake Terminal LLC
	On August 30, 2013, the Partnership completed its acquisition of the assets and business operations of Lakeshore Coal Handling Corporation ("Lakeshore"), now called SunCoke Lake Terminal LLC ("Lake Terminal") for $28.6 million. Prior to the acquisition, the entity that owns SunCoke's Indiana Harbor cokemaking operations was a customer of Lakeshore and held the purchase rights to Lakeshore. Concurrent with the closing of the transaction, the Partnership paid $1.8 million to DTE Energy Company, the third party investor owning a 15 percent interest in the entity that owns Indiana Harbor, in consideration for assigning its share of the Lake Terminal buyout rights to the Partnership. The Partnership recognized this payment in selling, general, and administrative expenses on the Combined and Consolidated Statement of Income during 2014.
	Located in East Chicago, Indiana, Lake Terminal does not take possession of coal but instead derives its revenue by providing coal handing and blending services to its customers on a per ton basis. Lake Terminal has and will continue to provide coal handling and blending services to SunCoke's Indiana Harbor cokemaking operations. In September 2013, Lake Terminal and Indiana Harbor entered into a new 10-year contract with terms equivalent to those of an arm's-length transaction.
	The following table summarizes the consideration paid for Lake Terminal and the fair value of the assets acquired at the acquisition date (dollars in millions):
	Consideration:
	Cash	$	28.6
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Plant, property and equipment	25.9
	Inventory	2.7
	Total	$	28.6
	The results of Lake Terminal have been included in the combined and consolidated financial statements since the acquisition date and are included in the Coal Logistics segment. The acquisition of Lake Terminal increased revenues by $13.4 million and $4.6 million and operating income by $1.7 million and $1.9 million for the years ended December 31, 2014 and 2013, respectively. The acquisition of Lake Terminal is not material to the Partnership's combined and consolidated financial statements; therefore, pro forma information has not been presented.
	Kanawha River Terminal LLC
	On October 1, 2013, the Partnership acquired Kanawha River Terminals ("KRT") for $84.7 million, utilizing $44.7 million of available cash and $40.0 million of borrowings under its existing revolving credit facility. KRT is a leading metallurgical and thermal coal blending and handling service provider with collective capacity to blend and transload 30 million tons of coal annually through its operations in West Virginia and Kentucky. KRT has and will continue to provide coal handling and blending services to third parties as well as the Partnership's Middletown cokemaking operations and certain other SunCoke facilities under contract with terms equivalent to those of an arm's-length transaction. This acquisition is part of the Partnership’s strategy to grow through adjacent business lines. The goodwill of $8.2 million arising from the acquisition is primarily due to the strategic location of KRT’s operations.
	The following table summarizes the consideration paid for KRT and the fair value of assets acquired and liabilities assumed at the acquisition date (dollars in millions):
	Consideration:
	Cash	$	84.7
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Current assets	5.2
	Plant, property and equipment	67.2
	Intangible assets	7.9
	Current liabilities	(3.7		)
	Other long-term liabilities	(0.1		)
	Total identifiable net assets assumed	76.5
	Goodwill	8.2
	Total	$	84.7
	The results of KRT have been included in the combined and consolidated financial statements since the acquisition date and are included in the Coal Logistics segment. Inclusive of intersegment sales of $4.5 million and $1.1 million, KRT had revenues of $41.6 million and $9.0 million for the years ended December 31, 2014 and 2013, respectively. The acquisition of KRT increased operating income by $5.0 million and $1.0 million for the years ended December 31, 2014 and 2013, respectively. The acquisition of KRT is not material to the Partnership’s combined and consolidated financial statements; therefore, pro forma information has not been presented.

Noncontrolling_Interest

Noncontrolling Interest	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest [Abstract]
Noncontrolling Interest	5. Noncontrolling Interest
	Concurrent with our IPO, the 35 percent interest in each of Haverhill and Middletown retained by SunCoke was recorded as a noncontrolling interest of the Partnership. Subsequent to the Haverhill and Middletown Dropdown, SunCoke's ownership in Haverhill and Middletown decreased to 2 percent and is recorded as noncontrolling interest of the Partnership on the Combined and Consolidated Statement of Income. Net income attributable to noncontrolling interest was $15.7 million and $40.8 million for the years ended December 31, 2014 and 2013, respectively.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	6. Related Party Transactions
	The related party transactions with SunCoke and its affiliates are described below.
	Transactions with Affiliate
	At December 31, 2014 and 2013, the Partnership had net receivables with SunCoke and its affiliates of $3.1 million and $6.4 million, respectively. Coal Logistics provides coal handling and blending services to certain SunCoke cokemaking operations. During 2014 and 2013, Coal Logistics recorded $13.1 million and $4.3 million in revenues derived from services provided to SunCoke’s cokemaking operations. During 2013, the Partnership also purchased and sold coke to other SunCoke entities in order to facilitate certain commercial agreements. Revenues and purchases from these related party transactions in 2013 totaled $19.2 million and $6.0 million, respectively. Pursuant to the omnibus agreement, the terms of these transactions were consistent with the Partnership’s existing customer agreements up to contract maximum production levels. Sales exceeding contract maximum production levels were based on current market values. The Partnership also purchased coal and other services from SunCoke and its affiliates totaling $29.9 million and $18.1 million during 2014 and 2013, respectively.
	Allocated Expenses
	We were allocated expenses of $23.4 million, $23.2 million and $27.5 million in 2014, 2013 and 2012, respectively. These allocated costs are for services provided to us by SunCoke. SunCoke centrally provides engineering, operations, procurement and information technology support to its facilities. In addition, allocated costs include legal, accounting, tax, treasury, insurance, employee benefit costs, communications and human resources. For periods subsequent to the IPO, corporate allocations were recorded based upon the omnibus agreement under which SunCoke will continue to provide us with certain support services. SunCoke will charge us for all direct costs and expense incurred on our behalf and a fee associated with support services provided to our operations.
	Parent Net Equity
	Net transfers (to) from parent are included within parent net equity within the combined and consolidated financial statements and included intercompany dividends, cash pooling and general financing activities, cash transfers for capital expenditures and corporate allocations, including income taxes.

Customer_Concentrations

Customer Concentrations	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Customer Concentrations	7. Customer Concentrations
	In 2014, the Partnership sold approximately 2.4 million tons of coke to its three primary customers: AK Steel Corporation, or AK Steel, ArcelorMittal USA, Inc., or ArcelorMittal, and United States Steel Corporation, or U.S. Steel. The first phase of its Haverhill facility, or Haverhill 1, sells approximately one-half of the production from the Haverhill facility pursuant to long-term contracts with ArcelorMittal. The second phase of its Haverhill facility, or Haverhill 2, sells the remaining balance of coke produced at the Haverhill facility to AK Steel under long-term contracts. All coke sales from the Middletown cokemaking facility are made pursuant to a long-term contract with AK Steel. All coke sales from the Granite City facility are made pursuant to a long-term contract with U.S. Steel.
	The Partnership generally does not require any collateral with respect to its receivables. At December 31, 2014, the Partnership’s receivables balances were primarily due from ArcelorMittal, AK Steel and U.S. Steel. As a result, the Partnership experiences concentrations of credit risk in its receivables with these three customers; these concentrations of credit risk may be affected by changes in economic or other conditions affecting the steel industry. At December 31, 2014, receivables due from ArcelorMittal, AK Steel and U.S. Steel were $9.8 million, $14.5 million and $6.4 million, respectively.
	Sales to ArcelorMittal, in total, accounted for $175.9 million, $178.8 million and $207.3 million, or 20.1 percent, 19.2 percent and 20.4 percent, respectively of the Partnership’s total revenues for the years ended December 31, 2014, 2013 and 2012.
	Sales to AK Steel, in total, accounted for $402.4 million, $460.5 million and $510.9 million or 46.1 percent, 49.4 percent and 50.4 percent respectively, of the Partnership's total revenues for the years ended December 31, 2014, 2013 and 2012.
	Sales to US Steel, in total, accounted for $232.3 million, $245.8 million and $273.7 million or 26.6 percent, 26.4 percent and 27.0 percent respectively, of the Partnership's total revenues for the years ended December 31, 2014, 2013 and 2012.

Cash_Distributions_and_Net_Inc

Cash Distributions and Net Income Per Unit	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Cash Distributions and Net Income Per Unit	8. Cash Distribution and Net Income Per Unit
	Cash Distributions
	Our partnership agreement generally provides that we will make our distribution, if any, each quarter in the following manner:
	•	first, 98 percent to the holders of common units and 2 percent to our general partner, until each common unit has received the minimum quarterly distribution of $0.412500 plus any arrearages from prior quarters;
	•	second, 98 percent to the holders of subordinated units and 2 percent to our general partner, until each subordinated unit has received the minimum quarterly distribution of $0.412500; and
	•	third, 98 percent to all unitholders, pro rata, and 2 percent to our general partner, until each unit has received a distribution of $0.474375.
	If cash distributions to our unitholders exceed $0.474375 per unit in any quarter, our unitholders and our general partner will receive distributions according to the following percentage allocations:
			Total Quarterly Distribution Per Unit Amount				Marginal Percentage
							Interest in Distributions
							Unitholders			General Partner
	Minimum Quarterly Distribution		$0.41				98	%		2	%
	First Target Distribution		above $0.412500		up to $0.474375		98	%		2	%
	Second Target Distribution		above $0.474375		up to $0.515625		85	%		15	%
	Third Target Distribution		above $0.515625		up to $0.618750		75	%		25	%
	Thereafter		above $0.618750				50	%		50	%
	On April 21, 2014, our Board of Directors declared a quarterly cash distribution of $0.5000 per unit. This distribution was paid on May 30, 2014 to unitholders of record on May 15, 2014, which included equity issuances related to the Haverhill and Middletown Dropdown, and totaled $19.2 million. On July 21, 2014, our Board of Directors declared a quarterly cash distribution of $0.5150 per unit. This distribution was paid on August 29, 2014 to unitholders of record on August 15, 2014 and totaled $19.8 million. On October 21, 2014 our Board of Directors declared a quarterly cash distribution of $0.5275 per unit. This distribution was paid on November 28, 2014 to unitholders of record on November 14, 2014 and totaled $20.5 million. On January 26, 2015 our Board of Directors declared a quarterly cash distribution of $0.5408 per unit. This distribution was paid on February 27, 2015 to unitholders of record on February 13, 2015.
	Our distributions are declared subsequent to quarter end; therefore, the table below represents total cash distributions applicable to the period in which the distributions were earned. The allocation of total quarterly cash distributions to general and limited partners based on the number of units is as follows:
			Three Months Ended December 31,								Year Ended December 31,
			2014				2013				2014		2013
			(Dollars in millions, except per unit amounts)
	General partner's distributions:
	General partner's distributions		$	0.4			$	0.4			$	1.3	$	1.2
	General partner's incentive distribution rights		0.5				—				1.3		—
	Total general partner's distributions		0.9				0.4				2.6		1.2
	Limited partners' distributions:
	Common		11.8				7.4				45.3		25.6
	Subordinated		8.5				7.4				32.8		25.6
	Total limited partners' distributions		20.3				14.8				78.1		51.2
	Total Cash Distributions		$	21.2			$	15.2			$	80.7	$	52.4
	Cash distributions per unit applicable to limited partners(1)		$	0.5408			$	0.475			$	2.0833	$	1.6371
	-1	Represents cash distributions earned.
	Earnings Per Unit
	Our net income is allocated to the general partner and limited partners in accordance with their respective partnership percentages, after giving effect to priority income allocations for incentive distributions, if any, to our general partner, pursuant to our partnership agreement. Net income per unit is only calculated for the Partnership subsequent to the IPO as no units were outstanding prior to January 24, 2013. Distributions less than or greater than earnings are allocated in accordance with our partnership agreement. Payments made to our unitholders are determined in relation to actual distributions declared and are not based on the net income allocations used in the calculation of net income per unit.
	In addition to the common and subordinated units, we have also identified the general partner interest and incentive distribution rights as participating securities and use the two-class method when calculating the net income per unit applicable to limited partners, which is based on the weighted-average number of common units outstanding during the period. Basic and diluted net income per unit applicable to limited partners are the same because we do not have any potentially dilutive units outstanding. The Granite City Dropdown does not impact historical earnings per limited partner unit as pre-acquisition earnings were allocated to our general partner.
	The calculation of earnings per unit is as follows:
			Year Ended December 31,
			2014				2013
			(Dollars in millions, except per unit amounts)
	Net income attributable to SunCoke Energy Partners L.P./Predecessors		$	71.8			$	83.4
	Less: Allocation of net income attributable to Predecessors to the general partner		15.8				24.8
	Net income attributable to all partners		$	56			$	58.6
	General partner's distributions (including incentive distribution rights)		2.6				1.2
	Limited partners' distributions on common units		45.3				25.6
	Limited partners' distributions on subordinated units		32.8				25.6
	Distributions (greater than) less than earnings		(24.7		)		6.2
	General partner's earnings:
	Distributions (including incentive distribution rights)		2.6				1.2
	Allocation of distributions (greater than) less than earnings		(0.2		)		0.4
	Net income attributable to Predecessors		15.8				24.8
	Total general partner's earnings		18.2				26.4
	Limited partners' earnings on common units:
	Distributions		45.3				25.6
	Allocation of distributions (greater than) less than earnings		(14.2		)		2.9
	Total limited partners' earnings on common units		31.1				28.5
	Limited partners' earnings on subordinated units:
	Distributions		32.8				25.6
	Allocation of distributions (greater than) less than earnings		(10.3		)		2.9
	Total limited partners' earnings on subordinated units		22.5				28.5
	Weighted average limited partner units outstanding:
	Common - basic and diluted		19.7				15.7
	Subordinated - basic and diluted		15.7				15.7
	Net income per limited partner unit:
	Common - basic and diluted		$	1.58			$	1.81
	Subordinated - basic and diluted		$	1.43			$	1.81
Unit Activity
Unit activity since our IPO was as follows:
		Common - Public			Common - SunCoke			Total Common			Subordinated - SunCoke
At December 31, 2012		—			—			—			—
Units issued in conjunction with our IPO		13,500,000			2,209,697			15,709,697			15,709,697
Units issued to directors		3,456			—			3,456			—
At December 31, 2013		13,503,456			2,209,697			15,713,153			15,709,697
Units issued in conjunction with the acquisition of additional interest in Haverhill and Middletown		3,220,000			2,695,055			5,915,055			—
Units issued to directors		2,752			—			2,752			—
Units issued under the Equity Distribution Agreement		62,956			—			62,956			—
At December 31, 2014		16,789,164			4,904,752			21,693,916			15,709,697
Allocation of Net Income
Our partnership agreement contains provisions for the allocation of net income to the unitholders and the general partner. For purposes of maintaining partner capital accounts, the partnership agreement specifies that items of income and loss shall be allocated among the partners in accordance with their respective percentage interest. Normal allocations according to percentage interests are made after giving effect, if any, to priority income allocations in an amount equal to incentive cash distributions allocated 100 percent to the general partner. Prior to the Granite City Dropdown, the allocation of net income from Granite City’s operations is to the general partner.
The calculation of net income allocated to the general and limited partners was as follows:
		Year Ended December 31,
		2014				2013
		(Dollars in millions)
Net income attributable to SunCoke Energy Partners L.P./Predecessors		$	71.8			$	83.4
Less: Allocation of net income attributable to Predecessors to the general partner		15.8				24.8
Net income attributable to partners		$	56			$	58.6
General partner's incentive distribution rights		1.3				—
		54.7				58.6
General partner's ownership interest		2		%		2		%
General partner's allocated interest in net income		1.1				1.6
General partner's incentive distribution rights		1.3				—
Net income attributable to Predecessors		15.8				24.8
Total general partner's interest in net income		$	18.2			$	26.4
Common - public unitholder's interest in net income		$	23.8			24.5
Common - SunCoke interest in net income		6.2				4
Subordinated - SunCoke interest in net income		23.6				28.5
Total limited partners' interest in net income		$	53.6			$	57

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	9. Income Taxes
	The Partnership is a limited partnership and generally is not subject to federal or state income taxes. Earnings from the Middletown operations, however, are subject to a local income tax.
	The Predecessors' tax provisions were determined on a theoretical separate-return basis. Prior to July 2012, the Predecessor received federal income tax credits for coke production from the Haverhill 1, Haverhill 2 and Granite City cokemaking facilities. These tax credits were earned for each ton of coke produced and sold during the four years after the initial coke production at each facility. The eligibility to generate tax credits for coke production expired in March 2009, July 2012 and November 2013, respectively, for the Haverhill 1, Haverhill 2 and Granite City facilities. In conjunction with the contribution of the 65 percent interest in Haverhill and Middletown upon the closing of the IPO, all deferred tax assets and liabilities related Haverhill and Middletown were eliminated through equity. Granite City's tax provision has been determined on a theoretical separate-return basis for all periods presented.
	The components of income tax disaggregated between the Partnership and the Predecessors are as follows:
		Years Ended December 31,
		2014			2013				2012
		(Dollars in millions)
	Partnership:
	U.S. federal	$	—		$	—			$	—
	U.S. state and local	1.2			0.8				—
	Total Partnership income tax	1.2			0.8				—
	Predecessors:
	U.S. federal	$	7.5		$	(1.1	)		$	21.4
	U.S. state and local	1.8			2.1				1.9
	Total Predecessors' income tax	9.3			1				23.3
	Total income tax	$	10.5		$	1.8			$	23.3
	The reconciliation of Partnership income tax expense at the U.S. statutory rate is as follows:
		Years Ended December 31,
		2014						2013
		(Dollars in millions)
	Income tax expense at U.S. statutory rate of 35 percent	$	25.4		35	%		$	35.1		35	%
	Increase (reduction) in income taxes resulting from:
	Partnership income not subject to tax	(25.4		)	(35.0	)%		(35.1		)	(35.0	)%
	State and local tax for Middletown and Granite City Operations	1.1			1.5	%		0.5			0.5	%
	Other	0.1			0.2	%		0.3			0.3	%
		$	1.2		1.7	%		$	0.8		0.8	%
	The tax effects of temporary differences that comprise the net deferred income tax asset are as follows:
		December 31,
		2014			2013
		(Dollars in millions)
	Deferred tax assets:
	Federal and state credit carryforward	$	77.8		$	85.9
	Federal net operating loss	49.5			48.9
	State and local net operating loss	8.7			11.5
	Other liabilities not yet deductible	3.3			3
	Total deferred tax assets	139.3			149.3
	Less valuation allowance	(3.6		)	(3.2		)
	Deferred tax asset, net	135.7			146.1
	Deferred tax liabilities:
	Properties, plants and equipment	(112.8		)	(113.3		)
	Other liabilities	(0.7		)	—
	Total deferred tax liabilities	(113.5		)	(113.3		)
	Net deferred tax asset	$	22.2		$	32.8
	The net deferred income tax asset is classified in the combined and consolidated balance sheets as follows:
		December 31,
		2014			2013
		(Dollars in millions)
	Current asset	$	0.6		$	0.8
	Noncurrent asset	21.6			32
	Net deferred tax asset	$	22.2		$	32.8
	As of December 31, 2014, we had a local net operating loss carryforward which will be used to offset future local taxable income. If not used, the carryforward will expire between 2017 and 2018. In addition, we had federal and stated net operating losses and tax credit carryforwards related to our Granite City operations that were determined on a theoretical separate-return basis.
	Local income tax returns are generally subject to examination for a period of three years after filing of the respective returns. Pursuant to the omnibus agreement, SunCoke will fully indemnify us with respect to any tax liability arising prior to or in connection with the closing of the IPO. There are no uncertain tax positions recorded at December 31, 2014 or 2013 and there were no interest or penalties recognized related to uncertain tax positions for the years ended December 31, 2014, 2013 and 2012.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventories	10. Inventories
	The Partnership’s inventory consists of metallurgical coal, which is the principal raw material for the Partnership’s cokemaking operations; coke, which is the finished goods sold by the Partnership to its customers; and materials, supplies and other.
	These components of inventories were as follows:
		December 31,
		2014		2013
		(Dollars in millions)
	Coal	$	60.4	$	48.8
	Coke	2		4.6
	Material, supplies, and other	28		27.6
	Total Inventories	$	90.4	$	81

Properties_Plants_and_Equipmen

Properties, Plants, and Equipment, Net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Properties, Plants, and Equipment, Net	11. Properties, Plants, and Equipment, Net
	The components of net properties, plants and equipment were as follows:
		December 31, (1)
		2014			2013
		(Dollars in millions)
	Coke and energy plant, machinery and equipment	$	1,251.30		$	1,194.40
	Coal logistics plant, machinery and equipment	83.6			82.6
	Land and land improvements	54.1			56.8
	Construction-in-progress	43.3			37.4
	Other	13.2			10.7
	Gross investment, at cost	1,445.50			1,381.90
	Less: accumulated depreciation	(232.1		)	(182.2		)
	Total Properties, Plant and Equipment, net	$	1,213.40		$	1,199.70
	-1	Includes assets, consisting mainly of coke and energy plant, machinery and equipment, with a gross investment totaling $793.4 million and $790.3 million and accumulated depreciation of $106.5 million and $79.6 million at December 31, 2014 and December 31, 2013, respectively, which are subject to long-term contracts to sell coke and are deemed to contain operating leases.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	12. Goodwill and Other Intangible Assets
	The Partnership completed the acquisition of KRT during 2013 for an aggregate cash consideration, net of cash acquired, of $84.7 million, of which $8.2 million was allocated to goodwill primarily due to the strategic location of KRT's operations. As of December 31, 2014 and 2013, goodwill was $8.2 million for our Coal Logistics segment.
	The following table summarized the components of gross and net intangible asset balances as of December 31, 2014 and December 31, 2013 (in millions):
			31-Dec-14						31-Dec-13
		Weighted - Average Remaining Amortization Years	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
	Customer relationships	10	$	6.7	$	0.7	$	6	$	6.7	$	0.1	$	6.6
	Trade name	4	1.2		0.3		0.9		1.2		—		1.2
	Total		$	7.9	$	1	$	6.9	$	7.9	$	0.1	$	7.8
	Total amortization expense for intangible assets subject to amortization was $0.9 million and $0.1 million for the years ended December 31, 2014 and December 31, 2013, respectively. Based on the carrying value of definite-lived intangible assets as of December 31, 2014, we estimate amortization expense to be $0.8 million in each of the next four years and $0.6 million in the fifth year and all remaining years thereafter.

Retirement_and_Other_PostEmplo

Retirement and Other Post-Employment Benefits Plans	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Retirement and Other Post-Employment Benefits Plans	13. Retirement and Other Post-Employment Benefits Plans
	Certain employees of the Partnership's operating subsidiaries participate in defined contribution and postretirement health care and life insurance plans sponsored by SunCoke. These plans have been accounted for in the combined and consolidated financial statements as multi-employer plans and are immaterial to the results of the Partnership for all periods presented.
	Defined Contribution Plans
	Certain employees of the Partnership's operating subsidiaries participate in defined contribution plans sponsored by SunCoke which provide retirement benefits. The Partnership’s contributions, which are principally based on its allocable portion of SunCoke’s pretax income and the aggregate compensation levels of participating employees and are charged against income as incurred, amounted to $3.2 million, $2.1 million and $1.7 million in 2014, 2013 and 2012, respectively.
	Postretirement Health Care and Life Insurance Plans
	Certain employees of the Partnership’s operating subsidiaries participate in other unfunded postemployment benefit plans sponsored by SunCoke. The amount of other postretirement benefit plans expense allocated to the Partnership related to these plans is reflected in operating expenses in the Combined and Consolidated Statements of Income and was immaterial for all periods presented.
	The postretirement benefit plans are unfunded and the costs are borne by the Partnership.

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	14. Debt
		December 31,
		2014			2013
		(Dollars in millions)
	7.375% senior notes, due 2020 (“Partnership Notes”), including original issue premium of $11.5 million at December 31, 2014	$	411.5		$	150
	Revolving credit facility, due 2019 ("Partnership Revolver")	—			40
	Debt issuance costs	(12.5		)	(6.8		)
	Total long-term debt	$	399		$	183.2
	Credit Facilities
	On July 26, 2011, SunCoke entered into a credit agreement (the “Credit Agreement”) which provides for a seven-year term loan (the “Term Loan”). Borrowings under the Term Loan bear interest, at SunCoke’s option, at either (i) base rate plus an applicable margin or (ii) the greater of 1.00 percent or LIBOR plus an applicable margin. The applicable margin on the Term Loan is (i) in the case of base rate loans, 2.00 percent per annum and (ii) in the case of LIBOR loans, 3.00 percent per annum.
	Though SunCoke was the legal entity obligated to repay the Term Loan, effective July 26, 2011, SunCoke allocated $225.0 million of the Term Loan and related debt issuance costs of $5.7 million to the Partnership. Interest expense and amortization of debt issuance costs related to the Term Loan were allocated to the Partnership beginning on July 26, 2011 and totaled $0.3 million, $0.6 million and $10.3 million in 2014, 2013 and 2012, respectively. The amount of consolidated debt attributed to the combined and consolidated financial statements may not be indicative of the actual amounts that we would have incurred had we been operating as an independent, publicly-traded partnership for periods prior to the IPO. Prior to entering into the Credit Agreement, SunCoke did not have any external debt, and no debt or interest expense was allocated to the Predecessors. On January 24, 2013, in conjunction with the IPO, we assumed and repaid the $225.0 million of the Term Loan that was allocated to us. In conjunction with the repayment, we incurred a charge of approximately $2.9 million in 2013 representing the write-off of unamortized debt issuance costs and original issue discount related to the portion of the Term Loan extinguished, which is recorded in interest expense on the Combined and Consolidated Statement of Income.
	In conjunction with the closing of the IPO in 2013, the Partnership also entered into a $100.0 million revolving credit facility ("the Partnership Revolver") with a term extending through January 2018. The Partnership incurred issuance costs of $2.2 million in conjunction with entering into this new revolving credit facility. This credit facility was amended on August 28, 2013, increasing the total aggregate commitments from lenders to $150.0 million and also providing for up to $100.0 million uncommitted incremental revolving capacity, subject to the satisfaction of certain conditions. The Partnership paid $0.9 million in fees related to the credit facility amendment. The fees have been included in deferred charges and other assets in the Combined and Consolidated Balance Sheet, which will be amortized over the life of the facility. On October 1, 2013 the Partnership borrowed $40.0 million against the revolving credit facility for the purchase of KRT. In connection with the Haverhill and Middletown Dropdown in 2014, the Partnership repaid $40.0 million on the Partnership Revolver and amended the Partnership Revolver to include (i) an increase in the total aggregate commitments from lenders from $150.0 million to $250.0 million and (ii) an extension of the maturity date from January 2018 to May 2019. The Partnership paid $1.8 million in 2014 for fees related to the Partnership Revolver amendment, which are included in deferred charges and other assets in the Combined and Consolidated Balance Sheet. The weighted-average interest rate for borrowings under the revolving credit facility during 2014 was 2.39 percent. At December 31, 2014, $250.0 million was available on the Partnership Revolver. Commitment fees are based on the unused portion of the Partnership Revolver at a rate of 0.40 percent.
	Senior Notes
	With the closing of the IPO, the Partnership issued $150.0 million of Partnership Notes. In conjunction with this transaction, the Partnership incurred debt issuance costs of $3.7 million, $0.8 million of which were expensed immediately and were included in interest expense on the Combined and Consolidated Statement of Income as it related to the portion of the issuance that was considered a modification of the existing Term Loan discussed above.
	The Partnership Notes bear interest at a rate of 7.375 percent per annum and mature on February 1, 2020. Interest on the Notes is payable semi-annually in cash in arrears on February 1 and August 1 of each year. The Partnership may redeem some or all of the Partnership Notes prior to February 1, 2016 by paying a make-whole premium. The Partnership may also redeem some or all of the Partnership Notes on or after February 1, 2016 at specified redemption prices. In addition, prior to February 1, 2016, the Partnership may redeem up to 35.0 percent of the Partnership Notes using the proceeds of certain equity offerings. If the Partnership sells certain of its assets or experiences specific kinds of changes in control, subject to certain exceptions, the Partnership must offer to purchase the Partnership Notes.
	On May 9, 2014, in connection with the Haverhill and Middletown Dropdown, the Partnership issued $250.0 million of add-on Partnership Notes. Proceeds of $263.1 million included an original issue premium of $13.1 million. In addition, the Partnership received $5.0 million to fund interest from February 1, 2014 to May 9, 2014, the period prior to the issuance. This interest was paid to noteholders on August 1, 2014. The Partnership incurred debt issuance costs of $4.9 million, of which $0.9 million was considered a modification of debt and was immediately expensed and recorded in interest expense, net in the Combined and Consolidated Statement of Income and was included in other operating cash flows in the Combined and Consolidated Statement of Cash Flows.
	Also, in connection with the Haverhill and Middletown Dropdown, the Partnership assumed from SunCoke and repaid $99.9 million of Term Loan and $160.0 million of Notes. The Partnership also paid a market premium of $11.4 million to complete the tender of the Notes, which was included in interest expense, net in the Combined and Consolidated Statement of Income. Debt extinguishment costs, including unamortized debt issuance costs and original issue discount, of $3.1 million were immediately expensed and recorded in interest expense, net in the Combined and Consolidated Statement of Income.
	In connection with the Granite City Dropdown, during January 2015 the Partnership assumed and repaid $135.0 million principal amount of SunCoke’s outstanding 7.625 percent senior notes and paid $5.6 million of accrued interest and $7.7 million of redemption premium in connection therewith. To fund this debt assumption and redemption, the Partnership issued $200.0 million of add-on 7.375 percent unsecured senior notes.
	Covenants
	The Partnership is subject to certain debt covenants that, among other things, limit the Partnership’s ability and the ability of certain of the Partnership’s subsidiaries to (i) incur indebtedness, (ii) pay dividends or make other distributions, (iii) prepay, redeem or repurchase certain debt, (iv) make loans and investments, (v) sell assets, (vi) incur liens, (vii) enter into transactions with affiliates and (viii) consolidate or merge. These covenants are subject to a number of exceptions and qualifications set forth in the respective agreements. Additionally, under the terms of the Partnership Revolver, the Partnership was subject to a maximum consolidated leverage ratio of 4.00:1.00, calculated by dividing total debt by EBITDA as defined by the Partnership Revolver, and a minimum consolidated interest coverage ratio of 2.50:1.00, calculated by dividing EBITDA by interest expense as defined by the Partnership Revolver. As of December 31, 2014, the Partnership was in compliance with all applicable debt covenants contained in the Partnership Revolver. We do not anticipate violation of these covenants nor do we anticipate that any of these covenants will restrict our operations or our ability to obtain additional financing.
	On April 21, 2015, the Partnership amended its revolving credit facility to increase the maximum consolidated leverage ratio from 4.00:1.00 to 4.50:1.00.
	Maturities
	There are no debt maturities in each of the next four years. Debt maturities in 2020 are $600.0 million, inclusive of the $200.0 million of add-on notes issued in January 2015.

Commitments_and_Contingent_Lia

Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	15. Commitments and Contingent Liabilities
	The aggregate amount of future minimum annual rentals applicable to noncancelable operating leases is as follows:
		Minimum
		Rental
		Payments
		(Dollars in millions)
	Year ending December 31:
	2015	$	1.6
	2016	0.9
	2017	0.4
	2018	0.4
	2019	0.4
	2020-Thereafter	0.3
	Total	$	4
	The EPA and state regulators have issued Notices of Violations (“NOVs”) for the Haverhill and Granite City cokemaking facilities which stem from alleged violations of air operating permits for this facility. SunCoke is working in a cooperative manner with the EPA and Ohio Environmental Protection Agency to address the allegations and has entered into a consent degree in federal district court with these parties. The consent decree includes an approximately $2.2 million civil penalty payment that was paid by SunCoke in December 2014, as well as the capital projects underway to improve the reliability of the energy recovery systems and enhance environmental performance at the Haverhill and Granite City facilities.
	We retained $119 million in proceeds from the Partnership offering, Haverhill and Middletown Dropdown and January 2015 Granite City Dropdown (see Note 4) for environmental capital expenditures related to these projects. Pursuant to the omnibus agreement, any amounts that we spend on these projects in excess of the $119 million will be reimbursed by SunCoke. Prior to our formation, SunCoke spent approximately $7 million related to these projects. The Partnership has spent approximately $68 million to date and the remaining capital is expected to be spent through the first quarter of 2017.
	The Partnership is a party to certain other pending and threatened claims. Although the ultimate outcome of these claims cannot be ascertained at this time, it is reasonably possible that some portion of these claims could be resolved unfavorably to the Partnership. Management of the Partnership believes that any liability which may arise from claims would not be material in relation to the financial position, results of operations or cash flows of the Partnership at December 31, 2014.

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	16. Supplemental Cash Flow Information
	Significant non-cash activities were as follows:
		Years Ended
		2014		2013		2012
		(Dollars in millions)
	Debt assumed by SunCoke Energy Partners, L.P.	$	259.9	$	225	$	—
	Net assets of the Predecessors not assumed by SunCoke Energy Partners, L.P.:
	Accounts receivable	—		39.6		—
	Deferred taxes	—		18.3		—
	The Partnership made cash interest payments of $15.7 million and $6.0 million during 2014 and 2013, respectively.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	17. Fair Value Measurements
	The Partnership measures certain financial and non-financial assets and liabilities at fair value on a recurring basis. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. Fair value disclosures are reflected in a three-level hierarchy, maximizing the use of observable inputs and minimizing the use of unobservable inputs.
	The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability on the measurement date. The three levels are defined as follows:
	•	Level 1—inputs to the valuation methodology are quoted prices (unadjusted) for an identical asset or liability in an active market.
	•	Level 2—inputs to the valuation methodology include quoted prices for a similar asset or liability in an active market or model-derived valuations in which all significant inputs are observable for substantially the full term of the asset or liability.
	•	Level 3—inputs to the valuation methodology are unobservable and significant to the fair value measurement of the asset or liability.
	Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
	Certain assets and liabilities are measured at fair value on a recurring basis. The Partnership’s cash equivalents are measured at fair value based on quoted prices in active markets for identical assets. These inputs are classified as Level 1 within the valuation hierarchy. The Partnership had no cash equivalents at December 31, 2014 and $12.0 million of cash equivalents at December 31, 2013.
	Non-Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis
	Certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the assets and liabilities are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (e.g., when there is evidence of impairment). At December 31, 2014, no material fair value adjustments or fair value measurements were required for these non-financial assets or liabilities.
	Certain Financial Assets and Liabilities not Measured at Fair Value
	At December 31, 2014 and 2013 the estimated fair value of the Partnership’s long-term debt was estimated to be $415.7 million and $156.5 million, respectively, compared to a carrying amount of $411.5 million and $149.7 million, respectively. The fair value was estimated by management based upon estimates of debt pricing provided by financial institutions and are considered Level 2 inputs.

Equity_Distribution_Agreement

Equity Distribution Agreement	12 Months Ended
	Dec. 31, 2014
Statement of Partners' Capital [Abstract]
Equity Distribution Agreement	18. Equity Distribution Agreement
	On August 5, 2014, the Partnership entered into an equity distribution agreement (the “Equity Agreement”) with Wells Fargo Securities, LLC (“Wells Fargo”). Pursuant to the terms of the Equity Agreement, the Partnership may sell from time to time through Wells Fargo, the Partnership’s common units representing limited partner interests having an aggregate offering price of up to $75.0 million. Sales of the common units, if any, will be made by means of ordinary brokers’ transactions through the facilities of the New York Stock Exchange at market prices, in block transactions, or as otherwise agreed by the Partnership and Wells Fargo, by means of any other existing trading market for the common units or to or through a market maker other than on an exchange. The common units will be issued pursuant to the Partnership’s existing effective shelf registration statement.
	Under the terms of the Equity Agreement, the Partnership also may sell common units to Wells Fargo as principal for its own account at a price to be agreed upon at the time of sale. Any sale of common units to Wells Fargo as principal would be pursuant to the terms of a separate terms agreement between the Partnership and Wells Fargo.
	During 2014, the Partnership sold 62,956 common units under the Equity Agreement with an aggregate offering price of $1.8 million, leaving $73.2 million available under the Equity Agreement.

Business_Segment_Information

Business Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Business Segment Information	19. Business Segment Information
	The Partnership derives its revenues from the Domestic Coke and Coal Logistics reportable segments. Domestic Coke operations are comprised of the Haverhill and Middletown cokemaking facilities, located in Ohio, and the Granite City cokemaking facility located in Illinois. These facilities use similar production processes to produce coke and to recover waste heat that is converted to steam or electricity. Coke sales at each of the Partnership's cokemaking facilities are made pursuant to long-term take-or-pay agreements with ArcelorMittal, AK Steel and U.S. Steel. Each of the coke sales agreements contain pass-through provisions for costs incurred in the cokemaking process, including coal procurement costs (subject to meeting contractual coal-to-coke yields), operating and maintenance expenses, costs related to the transportation of coke to the customers, taxes (other than income taxes) and costs associated with changes in regulation, in addition to containing a fixed fee.
	Prior to the third quarter of 2013, Domestic Coke was the Partnership's only reportable segment. During 2013, the Partnership, through acquisition, began providing coal handling and blending services to both SunCoke cokemaking facilities as well as third party customers. This business has a collective capacity to blend and transload more than 30 million tons of coal annually. Coal blending and handling results are presented in the Coal Logistics segment below.
	Corporate and other expenses that can be identified with a segment have been included in determining segment results. The remainder is included in Corporate and Other. Interest expense, net is also excluded from segment results. Segment assets are those assets that are utilized within a specific segment.
	The following table includes Adjusted EBITDA, which is the measure of segment profit or loss reported to the chief operating decision maker for purposes of allocating resources to the segments and assessing their performance:
			Years Ended December 31,
			2014				2013
			(Dollars in millions)
	Sales and other operating revenue:
	Domestic Coke		$	823.7			$	919.3
	Coal Logistics		49.3				12.4
	Coal Logistics intersegment sales		5.7				1.2
	Elimination of intersegment Sales		(5.7		)		(1.2		)
	Total Sales and other operating revenue		$	873			$	931.7
	Adjusted EBITDA:
	Domestic Coke		$	181.8			$	196.9
	Coal Logistics		14.3				4.7
	Corporate and Other		(7.2		)		(6.8		)
	Total Adjusted EBITDA		$	188.9			$	194.8
	Depreciation and amortization expense:
	Domestic Coke		$	46.7			$	44.8
	Coal Logistics		7.6				1.8
	Total Depreciation and amortization expense		$	54.3			$	46.6
	Capital expenditures:
	Domestic Coke		$	64.7			$	46
	Coal Logistics		2.9				0.2
	Total Capital expenditures		$	67.6			$	46.2
			December 31,
			2014				2013
			(Dollars in millions)
	Segment assets:
	Domestic Coke		$	1,264.10			$	1,234.00
	Coal Logistics		116.6				120.6
	Corporate and Other		14.7				22.7
	Segment assets, excluding tax assets		1,395.40				1,377.30
	Tax assets		21.6				32
	Total assets		$	1,417.00			$	1,409.30
	The following table sets forth the Partnership’s total sales and other operating revenue by product or service:
		Years Ended December 31,
		2014				2013				2012
		(Dollars in millions)
	Cokemaking revenues	$	757.9			$	853.6			$	951.5
	Energy revenues	65.7				65.6				62.4
	Coal logistics revenues	47.4				11.2				—
	Other revenues	2				1.3				—
	Total	$	873			$	931.7			$	1,013.90
	The Partnership evaluates the performance of its segments based on segment Adjusted EBITDA, which is defined as earnings before interest, taxes, depreciation and amortization (“EBITDA”) adjusted for sales discounts. Prior to the expiration of our nonconventional fuel tax credits in November 2013, EBITDA reflected sales discounts included as a reduction in sales and other operating revenue. The sales discounts represent the sharing with customers of a portion of nonconventional fuel tax credits, which reduce our income tax expense. However, we believe our Adjusted EBITDA would be inappropriately penalized if these discounts were treated as a reduction of EBITDA since they represent sharing of a tax benefit that is not included in EBITDA. Accordingly, in computing Adjusted EBITDA, we have added back these sales discounts. EBITDA and Adjusted EBITDA do not represent and should not be considered alternatives to net income or operating income under GAAP and may not be comparable to other similarly titled measures in other businesses.
	Management believes Adjusted EBITDA is an important measure of the operating performance of the Partnership's net assets and provides useful information to investors because it highlights trends in our business that may not otherwise be apparent when relying solely on GAAP measures and because it eliminates items that have less bearing on our operating performance. Adjusted EBITDA is a measure of operating performance that is not defined by GAAP, does not represent and should not be considered a substitute for net income as determined in accordance with GAAP. Calculations of Adjusted EBITDA may not be comparable to those reported by other companies.
	Set forth below is additional detail as to how we use Adjusted EBITDA as a measure of operating performance, as well as a discussion of the limitations of Adjusted EBITDA as an analytical tool.
	Operating Performance. Our management uses Adjusted EBITDA in a number of ways to assess our combined and consolidated financial and operating performance, and we believe this measure is helpful to management in identifying trends in our performance. Adjusted EBITDA helps management identify controllable expenses and make decisions designed to help us meet our current financial goals and optimize our financial performance while neutralizing the impact of capital structure on financial results. Accordingly, we believe this metric measures our financial performance based on operational factors that management can impact in the short-term, namely our cost structure and expenses.
	Limitations. Other companies may calculate Adjusted EBITDA differently than we do, limiting its usefulness as a comparative measure. Adjusted EBITDA also has limitations as an analytical tool and should not be considered in isolation or as a substitute for an analysis of our results as reported under GAAP. Some of these limitations include that Adjusted EBITDA:
	•	does not reflect our cash expenditures, or future requirements, for capital expenditures or contractual commitments;
	•	does not reflect changes in, or cash requirement for, working capital needs;
	•	does not reflect our interest expense, or the cash requirements necessary to service interest on or principal payments of our debt;
	•	does not reflect certain other non-cash income and expenses;
	•	excludes income taxes that may represent a reduction in available cash; and
	•	includes net income attributable to noncontrolling interests.
	Below is a reconciliation of Adjusted EBITDA (unaudited) to net income, which is its most directly comparable financial measure calculated and presented in accordance with GAAP:
			Year Ended December 30,
			2014				2013				2012
			(Dollars in millions)
	Adjusted EBITDA attributable to SunCoke Energy Partners, L.P.		$	130.9			$	103.5			$	—
	Add: Adjusted EBITDA attributable to Predecessors(1)		38.3				39.6				174
	Add: Adjusted EBITDA attributable to noncontrolling interest (2)		19.7				51.7				—
Adjusted EBITDA		$	188.9			$	194.8			$	174
Subtract:
Depreciation and amortization expense		54.3				46.6				46.4
Interest expense, net		37.1				15.4				10.3
Income tax expense		10.5				1.8				23.3
Sales discounts provided to customers due to sharing of nonconventional		(0.5		)		6.8				11.2
fuel tax credits (3)
Net income		$	87.5			$	124.2			$	82.8
-1	Reflects Granite City Adjusted EBITDA for all periods and Haverhill and Middletown Adjusted EBITDA for periods prior to the IPO.
-2	Reflects net income attributable to noncontrolling interest adjusted for noncontrolling interest share of interest, taxes and depreciation.
-3	Sales discounts are related to nonconventional fuel tax credits, which expired in 2013. At December 31, 2013, we had $13.6 million accrued related to sales discounts to be paid to our customer at our Granite City facility. During the first quarter of 2014, we settled this obligation for $13.1 million which resulted in a gain of $0.5 million. This gain is recorded in sales and other operating revenue on our Combined and Consolidated Statement of Income.

Selected_Quarterly_Data_Unaudi

Selected Quarterly Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Income Statement [Abstract]
Selected Quarterly Data (Unaudited)	20. Selected Quarterly Data (unaudited)
		2014								2013
		First		Second		Third		Fourth		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter		Quarter		Quarter		Quarter		Quarter
		(Dollars in millions, except per unit amounts)
	Sales and other operating revenue	$	214.5	$	217.8	$	216.8	$	223.9	$	253.7	$	228.1	$	219.5	$	230.4
	Gross profit(1)	$	35.5	$	42.6	$	45.5	$	38.8	$	45.2	$	39.9	$	41.6	$	43
	Net income(2)	$	25.7	$	10.8	$	27.1	$	23.9	$	28.8	$	30.4	$	31	$	34
	Net income attributable to SunCoke Energy	$	13.2	$	1.2	$	20.2	$	21.4	$	11.8	$	15.8	$	13.7	$	17.3
	Partners, L.P.
	Net income per common unit (basic and diluted)	$	0.41	$	0.03	$	0.52	$	0.55	$	0.37	$	0.49	$	0.43	$	0.53
	Net income per subordinated unit (basic and	$	0.41	$	0.02	$	0.52	$	0.55	$	0.37	$	0.49	$	0.43	$	0.53
	diluted)
	Cash distribution per unit paid during period	$	0.475	$	0.5	$	0.515	$	0.5275	$	—	$	0.3071	$	0.4225	$	0.4325
	-1	Gross profit equals sales and other operating revenue less cost of products sold, operating expenses and depreciation and amortization.
	-2	Net income in the second quarter of 2014 was unfavorably impacted by costs associated with the Haverhill and Middletown Dropdown.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Summary of Significant Accounting Policies [Abstract]
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the combined and consolidated financial statements and accompanying notes. Actual amounts could differ from these estimates.
Revenue Recognition	Revenue Recognition
	The Partnership sells coke as well as steam and electricity and also provides coal blending and handling services to third-party customers. Revenues related to the sale of products are recognized when title passes, while service revenues are recognized when services are provided as defined by customer contracts. Revenues are not recognized until sales prices are fixed or determinable and collectability is reasonably assured.
	Substantially all of the coke produced by the Partnership is sold pursuant to long-term contracts with its customers. The Partnership evaluates each of its contracts to determine whether the arrangement contains a lease under the applicable accounting standards. If the specific facts and circumstances indicate that it is remote that parties other than the contracted customer will take more than a minor amount of the coke that will be produced by the property, plant and equipment during the term of the coke supply agreement, and the price that the customer is paying for the coke is neither contractually fixed per unit nor equal to the current market price per unit at the time of delivery, then the long-term contract is deemed to contain a lease. The lease component of the price of coke represents the rental payment for the use of the property, plant and equipment, and all such payments are accounted for as contingent rentals as they are only earned by the Partnership when the coke is delivered and title passes to the customer.
Cash Equivalents	Cash Equivalents
	The Partnership considers all highly liquid investments with a remaining maturity of three months or less at the time of purchase to be cash equivalents. These cash equivalents consist principally of time deposits and money market investments.
Inventories	Inventories
	Inventories are valued at the lower of cost or market. Cost is determined using the first-in, first-out method, except for materials and supplies inventory, which are determined using the average-cost method.
	The Partnership utilizes the selling prices under its long-term coke supply contracts to record lower of cost or market inventory adjustments.
Properties, Plants and Equipment, Net	Properties, Plants and Equipment, Net
	Plants and equipment are depreciated on a straight-line basis over their estimated useful lives. Coke and energy plant, machinery and equipment are depreciated over 25 to 30 years. Coal logistics plant and equipment are depreciated over 15 to 20 years. Depreciation is excluded from cost of products sold and operating expenses and is presented separately in the Combined and Consolidated Statements of Income. Gains and losses on the disposal or retirement of fixed assets are reflected in earnings when the assets are sold or retired. Amounts incurred that extend an asset’s useful life, increase its productivity or add production capacity are capitalized. The Company has recorded capitalized interest costs related to its environmental remediation project (see Note 15) of $3.2 million, $1.0 million, and $0.1 million for the years ended December 31, 2014, 2013 and 2012, respectively. Direct costs, such as outside labor, materials, internal payroll and benefits costs, incurred during the construction of a new facility are capitalized; indirect costs are not capitalized. Normal repairs and maintenance costs are expensed as incurred.
Asset Retirement Obligations	Asset Retirement Obligations
	The fair value of a liability for an asset retirement obligation is recognized in the period in which it is incurred if a reasonable estimate of fair value can be made. The associated asset retirement costs are capitalized as part of the carrying amount of the asset and depreciated over its remaining estimated useful life.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets
	Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Such events and circumstances include, among other factors: operating losses; unused capacity; market value declines; changes in the expected physical life of an asset; technological developments resulting in obsolescence; changes in demand for our products or in end-use goods manufactured by others utilizing our products as raw materials; changes in our business plans or those of our major customers, suppliers or other business partners; changes in competition and competitive practices; uncertainties associated with the U.S. and world economies; changes in the expected level of capital, operating or environmental remediation project expenditures; and changes in governmental regulations or actions.
	A long-lived asset is considered to be impaired when the undiscounted net cash flows expected to be generated by the asset are less than its carrying amount. Such estimated future cash flows are highly subjective and are based on numerous assumptions about future operations and market conditions. The impairment recognized is the amount by which the carrying amount exceeds the fair market value of the impaired asset. It is also difficult to precisely estimate fair market value because quoted market prices for our long-lived assets may not be readily available. Therefore, fair market value is generally based on the present values of estimated future cash flows using discount rates commensurate with the risks associated with the assets being reviewed for impairment.
Goodwill and Other Intangibles	Goodwill and Other Intangibles
	Goodwill, which represents the excess of the purchase price over the fair value of net assets acquired, is tested for impairment at least annually during the fourth quarter. All other intangible assets have finite useful lives and are amortized over their useful lives in a manner that reflects the pattern in which the economic benefit of the intangible asset is consumed. There was no impairment of goodwill or other intangibles during the periods presented. See Note 12.
Shipping and Handling Costs	Shipping and Handling Costs
	Shipping and handling costs are included in cost of products sold and operating expenses.
Fair Value Measurements	Fair Value Measurements
	The Partnership determines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. As required, the Partnership utilizes valuation techniques that maximize the use of observable inputs (levels 1 and 2) and minimize the use of unobservable inputs (level 3) within the fair value hierarchy included in current accounting guidance. The Partnership generally applies the “market approach” to determine fair value. This method uses pricing and other information generated by market transactions for identical or comparable assets and liabilities. Assets and liabilities are classified within the fair value hierarchy based on the lowest level (least observable) input that is significant to the measurement in its entirety.
Recently Issued Pronouncements	Recently Issued Pronouncements
	In April 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2015-03, "Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Cost." ASU 2015-03 requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Company early adopted this ASU during the first quarter of 2015. See Note 14.
	In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis." ASU 2015-02 eliminates the deferral of FASB Statement No. 167, "Amendments to FASB Interpretation No. 46(R)," and makes changes to both the variable interest model and the voting model. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Company does not expect this ASU to have a material effect on the Company's financial condition, results of operations, or cash flows.
	In January 2015, the FASB issued ASU 2015-01, "Income Statement—Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items". ASU 2015-01 eliminates the concept of extraordinary items from GAAP. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, or cash flows.
	In November 2014, the FASB issued ASU 2014-16, "Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share is More Akin to Debt or to Equity". ASU 2014-16 provides guidance to entities about how to determine the nature of the host contract by considering all terms and features of the hybrid financial instrument. It is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015, with early adoption permitted. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, or cash flows.
	In November 2014, the FASB issued ASU 2014-17, "Business Combinations (Topic 805): Pushdown Accounting". ASU 2014-17 provides guidance on whether and at what threshold an acquired entity can apply pushdown accounting in its separate financial statements. It is effective on November 18, 2014. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, or cash flows.
	In August 2014, the FASB issued ASU 2014-15, "Presentation of Financial Statements-Going Concern". This ASU is intended to define management's responsibility to evaluate whether there is substantial doubt about an organization's ability to continue as a going concern and to provide related footnote disclosures. It is effective for annual periods beginning after December 15, 2016, with early adoption permitted. The Partnership does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, and cash flows.
	In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which provides guidance for revenue recognition. Under this ASU, an entity is required to recognize revenue upon transfer of promised goods or services to customers, in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services.  The guidance also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from the customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. This ASU is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. The Partnership is currently reviewing the provisions of ASU 2014-09 but does not expect this ASU to have a material effect on the Partnership's financial condition, results of operations, and cash flows.

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Schedule of business acquisitions	The table below summarizes the effects of the changes in the Partnership’s ownership interest in Haverhill and Middletown on the Partnership’s equity.
		Year Ended December 31, 2014
		(Dollars in millions)
	Net income attributable to SunCoke Energy Partners, L.P.	56
	Change in SunCoke Energy Partners, L.P. partnership equity for the purchase of an additional 33.0 percent interest in Haverhill and Middletown	(170.1		)
	Change from net income attributable to SunCoke Energy Partners, L.P. and transfers to noncontrolling interest	$	(114.1	)
	The following table summarizes the consideration paid for KRT and the fair value of assets acquired and liabilities assumed at the acquisition date (dollars in millions):
	Consideration:
	Cash	$	84.7
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Current assets	5.2
	Plant, property and equipment	67.2
	Intangible assets	7.9
	Current liabilities	(3.7		)
	Other long-term liabilities	(0.1		)
	Total identifiable net assets assumed	76.5
	Goodwill	8.2
	Total	$	84.7
	The following table summarizes the consideration paid for Lake Terminal and the fair value of the assets acquired at the acquisition date (dollars in millions):
	Consideration:
	Cash	$	28.6
	Recognized amounts of identifiable assets acquired and liabilities assumed:
	Plant, property and equipment	25.9
	Inventory	2.7
	Total	$	28.6

Cash_Distributions_and_Net_Inc1

Cash Distributions and Net Income Per Unit (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Distributions Made to Limited Partner, by Distribution	If cash distributions to our unitholders exceed $0.474375 per unit in any quarter, our unitholders and our general partner will receive distributions according to the following percentage allocations:
			Total Quarterly Distribution Per Unit Amount				Marginal Percentage
							Interest in Distributions
							Unitholders			General Partner
	Minimum Quarterly Distribution		$0.41				98	%		2	%
	First Target Distribution		above $0.412500		up to $0.474375		98	%		2	%
	Second Target Distribution		above $0.474375		up to $0.515625		85	%		15	%
	Third Target Distribution		above $0.515625		up to $0.618750		75	%		25	%
	Thereafter		above $0.618750				50	%		50	%
	The calculation of net income allocated to the general and limited partners was as follows:
			Year Ended December 31,
			2014				2013
			(Dollars in millions)
	Net income attributable to SunCoke Energy Partners L.P./Predecessors		$	71.8			$	83.4
	Less: Allocation of net income attributable to Predecessors to the general partner		15.8				24.8
	Net income attributable to partners		$	56			$	58.6
	General partner's incentive distribution rights		1.3				—
			54.7				58.6
	General partner's ownership interest		2		%		2		%
	General partner's allocated interest in net income		1.1				1.6
	General partner's incentive distribution rights		1.3				—
	Net income attributable to Predecessors		15.8				24.8
	Total general partner's interest in net income		$	18.2			$	26.4
	Common - public unitholder's interest in net income		$	23.8			24.5
	Common - SunCoke interest in net income		6.2				4
	Subordinated - SunCoke interest in net income		23.6				28.5
	Total limited partners' interest in net income		$	53.6			$	57
	The allocation of total quarterly cash distributions to general and limited partners based on the number of units is as follows:
			Three Months Ended December 31,								Year Ended December 31,
			2014				2013				2014		2013
			(Dollars in millions, except per unit amounts)
	General partner's distributions:
	General partner's distributions		$	0.4			$	0.4			$	1.3	$	1.2
	General partner's incentive distribution rights		0.5				—				1.3		—
	Total general partner's distributions		0.9				0.4				2.6		1.2
	Limited partners' distributions:
	Common		11.8				7.4				45.3		25.6
	Subordinated		8.5				7.4				32.8		25.6
	Total limited partners' distributions		20.3				14.8				78.1		51.2
	Total Cash Distributions		$	21.2			$	15.2			$	80.7	$	52.4
	Cash distributions per unit applicable to limited partners(1)		$	0.5408			$	0.475			$	2.0833	$	1.6371
	-1	Represents cash distributions earned.
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	The calculation of earnings per unit is as follows:
			Year Ended December 31,
			2014				2013
			(Dollars in millions, except per unit amounts)
	Net income attributable to SunCoke Energy Partners L.P./Predecessors		$	71.8			$	83.4
	Less: Allocation of net income attributable to Predecessors to the general partner		15.8				24.8
	Net income attributable to all partners		$	56			$	58.6
	General partner's distributions (including incentive distribution rights)		2.6				1.2
	Limited partners' distributions on common units		45.3				25.6
	Limited partners' distributions on subordinated units		32.8				25.6
	Distributions (greater than) less than earnings		(24.7		)		6.2
	General partner's earnings:
	Distributions (including incentive distribution rights)		2.6				1.2
	Allocation of distributions (greater than) less than earnings		(0.2		)		0.4
	Net income attributable to Predecessors		15.8				24.8
	Total general partner's earnings		18.2				26.4
	Limited partners' earnings on common units:
	Distributions		45.3				25.6
	Allocation of distributions (greater than) less than earnings		(14.2		)		2.9
	Total limited partners' earnings on common units		31.1				28.5
	Limited partners' earnings on subordinated units:
	Distributions		32.8				25.6
	Allocation of distributions (greater than) less than earnings		(10.3		)		2.9
	Total limited partners' earnings on subordinated units		22.5				28.5
	Weighted average limited partner units outstanding:
	Common - basic and diluted		19.7				15.7
	Subordinated - basic and diluted		15.7				15.7
	Net income per limited partner unit:
	Common - basic and diluted		$	1.58			$	1.81
	Subordinated - basic and diluted		$	1.43			$	1.81
Schedule of Limited Partners' Capital Account by Class	Unit activity since our IPO was as follows:
			Common - Public			Common - SunCoke			Total Common			Subordinated - SunCoke
	At December 31, 2012		—			—			—			—
	Units issued in conjunction with our IPO		13,500,000			2,209,697			15,709,697			15,709,697
	Units issued to directors		3,456			—			3,456			—
	At December 31, 2013		13,503,456			2,209,697			15,713,153			15,709,697
	Units issued in conjunction with the acquisition of additional interest in Haverhill and Middletown		3,220,000			2,695,055			5,915,055			—
	Units issued to directors		2,752			—			2,752			—
	Units issued under the Equity Distribution Agreement		62,956			—			62,956			—
	At December 31, 2014		16,789,164			4,904,752			21,693,916			15,709,697

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	The components of income tax disaggregated between the Partnership and the Predecessors are as follows:
		Years Ended December 31,
		2014			2013				2012
		(Dollars in millions)
	Partnership:
	U.S. federal	$	—		$	—			$	—
	U.S. state and local	1.2			0.8				—
	Total Partnership income tax	1.2			0.8				—
	Predecessors:
	U.S. federal	$	7.5		$	(1.1	)		$	21.4
	U.S. state and local	1.8			2.1				1.9
	Total Predecessors' income tax	9.3			1				23.3
	Total income tax	$	10.5		$	1.8			$	23.3
Schedule of Effective Income Tax Rate Reconciliation	The reconciliation of Partnership income tax expense at the U.S. statutory rate is as follows:
		Years Ended December 31,
		2014						2013
		(Dollars in millions)
	Income tax expense at U.S. statutory rate of 35 percent	$	25.4		35	%		$	35.1		35	%
	Increase (reduction) in income taxes resulting from:
	Partnership income not subject to tax	(25.4		)	(35.0	)%		(35.1		)	(35.0	)%
	State and local tax for Middletown and Granite City Operations	1.1			1.5	%		0.5			0.5	%
	Other	0.1			0.2	%		0.3			0.3	%
		$	1.2		1.7	%		$	0.8		0.8	%
Schedule of Deferred Tax Assets and Liabilities	The tax effects of temporary differences that comprise the net deferred income tax asset are as follows:
		December 31,
		2014			2013
		(Dollars in millions)
	Deferred tax assets:
	Federal and state credit carryforward	$	77.8		$	85.9
	Federal net operating loss	49.5			48.9
	State and local net operating loss	8.7			11.5
	Other liabilities not yet deductible	3.3			3
	Total deferred tax assets	139.3			149.3
	Less valuation allowance	(3.6		)	(3.2		)
	Deferred tax asset, net	135.7			146.1
	Deferred tax liabilities:
	Properties, plants and equipment	(112.8		)	(113.3		)
	Other liabilities	(0.7		)	—
	Total deferred tax liabilities	(113.5		)	(113.3		)
	Net deferred tax asset	$	22.2		$	32.8
	The net deferred income tax asset is classified in the combined and consolidated balance sheets as follows:
		December 31,
		2014			2013
		(Dollars in millions)
	Current asset	$	0.6		$	0.8
	Noncurrent asset	21.6			32
	Net deferred tax asset	$	22.2		$	32.8

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of Inventories	These components of inventories were as follows:
		December 31,
		2014		2013
		(Dollars in millions)
	Coal	$	60.4	$	48.8
	Coke	2		4.6
	Material, supplies, and other	28		27.6
	Total Inventories	$	90.4	$	81

Properties_Plants_and_Equipmen1

Properties, Plants, and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	The components of net properties, plants and equipment were as follows:
		December 31, (1)
		2014			2013
		(Dollars in millions)
	Coke and energy plant, machinery and equipment	$	1,251.30		$	1,194.40
	Coal logistics plant, machinery and equipment	83.6			82.6
	Land and land improvements	54.1			56.8
	Construction-in-progress	43.3			37.4
	Other	13.2			10.7
	Gross investment, at cost	1,445.50			1,381.90
	Less: accumulated depreciation	(232.1		)	(182.2		)
	Total Properties, Plant and Equipment, net	$	1,213.40		$	1,199.70
	-1	Includes assets, consisting mainly of coke and energy plant, machinery and equipment, with a gross investment totaling $793.4 million and $790.3 million and accumulated depreciation of $106.5 million and $79.6 million at December 31, 2014 and December 31, 2013, respectively, which are subject to long-term contracts to sell coke and are deemed to contain operating leases.

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets	The following table summarized the components of gross and net intangible asset balances as of December 31, 2014 and December 31, 2013 (in millions):
			31-Dec-14						31-Dec-13
		Weighted - Average Remaining Amortization Years	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
	Customer relationships	10	$	6.7	$	0.7	$	6	$	6.7	$	0.1	$	6.6
	Trade name	4	1.2		0.3		0.9		1.2		—		1.2
	Total		$	7.9	$	1	$	6.9	$	7.9	$	0.1	$	7.8

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments
		December 31,
		2014			2013
		(Dollars in millions)
	7.375% senior notes, due 2020 (“Partnership Notes”), including original issue premium of $11.5 million at December 31, 2014	$	411.5		$	150
	Revolving credit facility, due 2019 ("Partnership Revolver")	—			40
	Debt issuance costs	(12.5		)	(6.8		)
	Total long-term debt	$	399		$	183.2

Commitments_and_Contingent_Lia1

Commitments and Contingent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	The aggregate amount of future minimum annual rentals applicable to noncancelable operating leases is as follows:
		Minimum
		Rental
		Payments
		(Dollars in millions)
	Year ending December 31:
	2015	$	1.6
	2016	0.9
	2017	0.4
	2018	0.4
	2019	0.4
	2020-Thereafter	0.3
	Total	$	4

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Significant non-cash activities were as follows:
		Years Ended
		2014		2013		2012
		(Dollars in millions)
	Debt assumed by SunCoke Energy Partners, L.P.	$	259.9	$	225	$	—
	Net assets of the Predecessors not assumed by SunCoke Energy Partners, L.P.:
	Accounts receivable	—		39.6		—
	Deferred taxes	—		18.3		—

Business_Segment_Information_T

Business Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following table includes Adjusted EBITDA, which is the measure of segment profit or loss reported to the chief operating decision maker for purposes of allocating resources to the segments and assessing their performance:
			Years Ended December 31,
			2014				2013
			(Dollars in millions)
	Sales and other operating revenue:
	Domestic Coke		$	823.7			$	919.3
	Coal Logistics		49.3				12.4
	Coal Logistics intersegment sales		5.7				1.2
	Elimination of intersegment Sales		(5.7		)		(1.2		)
	Total Sales and other operating revenue		$	873			$	931.7
	Adjusted EBITDA:
	Domestic Coke		$	181.8			$	196.9
	Coal Logistics		14.3				4.7
	Corporate and Other		(7.2		)		(6.8		)
	Total Adjusted EBITDA		$	188.9			$	194.8
	Depreciation and amortization expense:
	Domestic Coke		$	46.7			$	44.8
	Coal Logistics		7.6				1.8
	Total Depreciation and amortization expense		$	54.3			$	46.6
	Capital expenditures:
	Domestic Coke		$	64.7			$	46
	Coal Logistics		2.9				0.2
	Total Capital expenditures		$	67.6			$	46.2
			December 31,
			2014				2013
			(Dollars in millions)
	Segment assets:
	Domestic Coke		$	1,264.10			$	1,234.00
	Coal Logistics		116.6				120.6
	Corporate and Other		14.7				22.7
	Segment assets, excluding tax assets		1,395.40				1,377.30
	Tax assets		21.6				32
	Total assets		$	1,417.00			$	1,409.30
Reconciliation of Revenue from Segments to Consolidated	The following table sets forth the Partnership’s total sales and other operating revenue by product or service:
		Years Ended December 31,
		2014				2013				2012
		(Dollars in millions)
	Cokemaking revenues	$	757.9			$	853.6			$	951.5
	Energy revenues	65.7				65.6				62.4
	Coal logistics revenues	47.4				11.2				—
	Other revenues	2				1.3				—
	Total	$	873			$	931.7			$	1,013.90
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	Below is a reconciliation of Adjusted EBITDA (unaudited) to net income, which is its most directly comparable financial measure calculated and presented in accordance with GAAP:
			Year Ended December 30,
			2014				2013				2012
			(Dollars in millions)
	Adjusted EBITDA attributable to SunCoke Energy Partners, L.P.		$	130.9			$	103.5			$	—
	Add: Adjusted EBITDA attributable to Predecessors(1)		38.3				39.6				174
	Add: Adjusted EBITDA attributable to noncontrolling interest (2)		19.7				51.7				—
	Adjusted EBITDA		$	188.9			$	194.8			$	174
	Subtract:
	Depreciation and amortization expense		54.3				46.6				46.4
	Interest expense, net		37.1				15.4				10.3
	Income tax expense		10.5				1.8				23.3
	Sales discounts provided to customers due to sharing of nonconventional		(0.5		)		6.8				11.2
	fuel tax credits (3)
	Net income		$	87.5			$	124.2			$	82.8
	-1	Reflects Granite City Adjusted EBITDA for all periods and Haverhill and Middletown Adjusted EBITDA for periods prior to the IPO.
	-2	Reflects net income attributable to noncontrolling interest adjusted for noncontrolling interest share of interest, taxes and depreciation.
	-3	Sales discounts are related to nonconventional fuel tax credits, which expired in 2013. At December 31, 2013, we had $13.6 million accrued related to sales discounts to be paid to our customer at our Granite City facility. During the first quarter of 2014, we settled this obligation for $13.1 million which resulted in a gain of $0.5 million. This gain is recorded in sales and other operating revenue on our Combined and Consolidated Statement of Income.

Selected_Quarterly_Data_Tables

Selected Quarterly Data (Tables)	12 Months Ended
	Dec. 31, 2014
Income Statement [Abstract]
Schedule of Quarterly Financial Information
		2014								2013
		First		Second		Third		Fourth		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter		Quarter		Quarter		Quarter		Quarter
		(Dollars in millions, except per unit amounts)
	Sales and other operating revenue	$	214.5	$	217.8	$	216.8	$	223.9	$	253.7	$	228.1	$	219.5	$	230.4
	Gross profit(1)	$	35.5	$	42.6	$	45.5	$	38.8	$	45.2	$	39.9	$	41.6	$	43
	Net income(2)	$	25.7	$	10.8	$	27.1	$	23.9	$	28.8	$	30.4	$	31	$	34
	Net income attributable to SunCoke Energy	$	13.2	$	1.2	$	20.2	$	21.4	$	11.8	$	15.8	$	13.7	$	17.3
	Partners, L.P.
	Net income per common unit (basic and diluted)	$	0.41	$	0.03	$	0.52	$	0.55	$	0.37	$	0.49	$	0.43	$	0.53
	Net income per subordinated unit (basic and	$	0.41	$	0.02	$	0.52	$	0.55	$	0.37	$	0.49	$	0.43	$	0.53
	diluted)
	Cash distribution per unit paid during period	$	0.475	$	0.5	$	0.515	$	0.5275	$	—	$	0.3071	$	0.4225	$	0.4325
	-1	Gross profit equals sales and other operating revenue less cost of products sold, operating expenses and depreciation and amortization.
	-2	Net income in the second quarter of 2014 was unfavorably impacted by costs associated with the Haverhill and Middletown Dropdown.

General_Details

General (Details) (USD $)	12 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Jan. 13, 2015	Dec. 31, 2014	Jan. 23, 2013	9-May-14	Oct. 01, 2013	Jan. 24, 2013	8-May-14
	T
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Coal handling capacity (in tons)	30,000,000
SunCoke Energy Inc | Subsequent Event
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest in Partnership (as a percent)		56.10%
General Partner | Subsequent Event
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited Partnership (LP) ownership interest (as a percent)		2.00%
IPO | SunCoke Energy Inc
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest in Partnership (as a percent)	54.00%		54.00%
IPO | General Partner
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Limited Partnership (LP) ownership interest (as a percent)			2.00%	2.00%
IPO | Sun Coal & Coke
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest in Partnership (as a percent)	35.00%		35.00%
IPO | Haverhill Coke Company LLC and Middletown Coke Company LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest in Partnership (as a percent)				65.00%			65.00%
IPO | Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Inc
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Interest in Partnership (as a percent)	2.00%		2.00%	35.00%
Haverhill Coke Company LLC and Middletown Coke Company LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage interest owned (as a percent)					33.00%
Transaction value of additional interest purchased					$365
Haverhill Coke Company LLC and Middletown Coke Company LLC | Sun Coal & Coke
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percent interest acquired (as a percent)					2.00%			35.00%
Gateway Energy and Coal Company, LLC | Subsequent Event
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage interest owned (as a percent)		75.00%
Transaction value of additional interest purchased		245
Coal handling capacity (in tons)		650,000
Gateway Energy and Coal Company, LLC | Sun Coal & Coke | Subsequent Event
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percent interest acquired (as a percent)		25.00%
Kanawha River Terminals LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Transaction value of additional interest purchased						$84.70
Coal handling capacity (in tons)	30,000,000

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Employee
Interest costs capitalized	$3.20	$1	$0.10
Asset retirement obligation	$5.30	$4.90
Number of employees	562
United Steelworkers Union
Percentage of employees represented by the United Steelworkers	35.00%
International Union of Operating Engineers
Percentage of employees represented by the United Steelworkers	5.00%
Coke and energy plant, machinery and equipment | Minimum
Plant, machinery and equipment useful lives (in years)	25 years
Coke and energy plant, machinery and equipment | Maximum
Plant, machinery and equipment useful lives (in years)	30 years
Coal logistics plant, machinery and equipment | Minimum
Plant, machinery and equipment useful lives (in years)	15 years
Coal logistics plant, machinery and equipment | Maximum
Plant, machinery and equipment useful lives (in years)	20 years

Initial_Public_Offering_Detail

Initial Public Offering (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 26, 2011	Jan. 23, 2013	Aug. 28, 2013	Dec. 31, 2014	9-May-14	Jan. 24, 2013
Business Acquisition [Line Items]
Gross proceeds from the offering	$90,500,000	$231,800,000	$0
Long-term debt assumed and repaid	276,300,000	225,000,000	0
Sales discounts related to tax credits owed to customers	-500,000	6,800,000	11,200,000
Term Loans
Business Acquisition [Line Items]
Debt issuance cost				5,700,000
IPO
Business Acquisition [Line Items]
Gross proceeds from the offering					256,500,000
Net proceeds from the offering, after deducting underwriting discounts and offering expenses					231,800,000
Underwriting discounts and offering expenses			6,000,000		24,700,000
Proceeds retained to replenish working capital					39,600,000
IPO | Term Loans
Business Acquisition [Line Items]
Long-term debt assumed and repaid					225,000,000
IPO | Senior Notes, Due 2020
Business Acquisition [Line Items]
Partnership notes issued					150,000,000
Interest rate on partnership notes (as a percent)					7.38%
IPO | Senior Notes
Business Acquisition [Line Items]
Proceeds from issuance of notes, net of debt issuance costs					146,300,000
Debt issuance cost					3,700,000
IPO | Revolving Credit Facility
Business Acquisition [Line Items]
Debt issuance cost					2,200,000	900,000
IPO | Haverhill
Business Acquisition [Line Items]
Sales discounts related to tax credits owed to customers					12,400,000
IPO | General Partner
Business Acquisition [Line Items]
Limited Partnership (LP) ownership interest (as a percent)					2.00%		2.00%
IPO | Sun Coal & Coke
Business Acquisition [Line Items]
Interest in Partnership (as a percent)	35.00%						35.00%
IPO | Public
Business Acquisition [Line Items]
Common units issued during the period (in shares)					13,500,000
Partnership interest (as a percent)					42.10%
Initial public offering price (in dollars per share)					$19
IPO | SunCoke Energy Inc
Business Acquisition [Line Items]
Interest in Partnership (as a percent)	54.00%						54.00%
General Partner distributions					33,100,000
IPO | Common Units | Sun Coal & Coke
Business Acquisition [Line Items]
Common units issued during the period (in shares)					2,209,697
IPO | Subordinated Units | Sun Coal & Coke
Business Acquisition [Line Items]
Common units issued during the period (in shares)					15,709,697
IPO | Haverhill Coke Company LLC and Middletown Coke Company LLC
Business Acquisition [Line Items]
Interest in Partnership (as a percent)					65.00%				65.00%
Environmental capital expenditures retained	$119,000,000				$67,000,000			$7,000,000
IPO | Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Inc
Business Acquisition [Line Items]
Interest in Partnership (as a percent)	2.00%				35.00%		2.00%

Initial_Public_Offering_Omnibu

Initial Public Offering (Omnibus Agreement) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	9-May-14	Jan. 23, 2013	Jan. 13, 2015
Business Acquisition [Line Items]
Capital contribution from SunCoke Energy Partners GP LLC	$300,000	$900,000	$0
Coke Agreement Counterparties | IPO
Business Acquisition [Line Items]
Potential defaults by coke agreement counterparties indemnification period (in years)	5 years
Haverhill Coke Company LLC and Middletown Coke Company LLC | IPO
Business Acquisition [Line Items]
Environmental indemnity contribution expense	119,000,000			7,000,000	67,000,000
Environmental remediation expense carried by SunCoke Energy Partners L.P.					5,000,000
Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Inc | IPO
Business Acquisition [Line Items]
Environmental remediation expense indemnified by SunCoke					50,000,000
Successor
Business Acquisition [Line Items]
Capital contribution from SunCoke Energy Partners GP LLC		900,000
Haverhill Coke Company LLC and Middletown Coke Company LLC
Business Acquisition [Line Items]
Consideration retained for anticipated remediation cost				7,000,000
Percentage interest owned (as a percent)				33.00%
Subsequent Event | Gateway Energy and Coal Company, LLC
Business Acquisition [Line Items]
Consideration retained for anticipated remediation cost						$45,000,000
Percentage interest owned (as a percent)						75.00%

Acquisitions_Details

Acquisitions (Details) (USD $)	3 Months Ended								12 Months Ended			0 Months Ended		1 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 01, 2013	Aug. 30, 2013	Sep. 30, 2013
									T
Business Acquisition [Line Items]
Purchase price, cash									$0	$113,300,000	$0
Coal handling capacity (in tons)									30,000,000
Sales and other operating revenue	223,900,000	216,800,000	217,800,000	214,500,000	230,400,000	219,500,000	228,100,000	253,700,000	873,000,000	931,700,000
Operating income									135,100,000	141,400,000
Kanawha River Terminals LLC
Business Acquisition [Line Items]
Consideration transferred to acquire business												84,700,000
Purchase price, cash												44,700,000
Purchase price, borrowings												40,000,000
Coal handling capacity (in tons)									30,000,000
Goodwill						8,200,000						8,200,000		8,200,000
Revenues									41,600,000	9,000,000
Operating income									5,000,000	1,000,000
SunCoke Lake Terminal LLC
Business Acquisition [Line Items]
Consideration transferred to acquire business													28,600,000
Option to purchase entity													1,800,000
Percentage interest owned (as a percent)													15.00%
Term of contract (in years)														10 years
Purchase price, cash													28,600,000
Revenues									13,400,000	4,600,000
Operating income									1,700,000	1,900,000
Coal Logistics Intersegment Sales | Kanawha River Terminals LLC
Business Acquisition [Line Items]
Sales and other operating revenue									$4,500,000	$1,100,000

Acquisitions_Acquisitions_Gran

Acquisitions Acquisitions (Granite City) (Details) (USD $)	12 Months Ended			0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 13, 2015
	T
Business Acquisition [Line Items]
Coal handling capacity (in tons)	30,000,000
Repayment of long-term debt	$276.30	$225	$0
Accrued interest repaid	15.7	6
Subsequent Event
Business Acquisition [Line Items]
Senior notes				200
Subsequent Event | Senior Notes
Business Acquisition [Line Items]
Repayment of long-term debt				135
Accrued interest repaid				5.6
Subsequent Event | Common Units
Business Acquisition [Line Items]
Stock issued during period				50.7
Subsequent Event | General Partner
Business Acquisition [Line Items]
Stock issued during period				1
Subsequent Event | Gateway Energy and Coal Company, LLC
Business Acquisition [Line Items]
Percentage interest owned (as a percent)				75.00%
Consideration transferred to acquire business				245
Coal handling capacity (in tons)				650,000
Consideration retained for anticipated remediation cost				45
Subsequent Event | Gateway Energy and Coal Company, LLC | Senior Notes
Business Acquisition [Line Items]
Interest rate on debt (as a percent)				7.38%
Subsequent Event | Gateway Energy and Coal Company, LLC | Senior Notes, Due 2020
Business Acquisition [Line Items]
Interest rate on debt (as a percent)				7.63%
Subsequent Event | Gateway Energy and Coal Company, LLC | Sun Coal & Coke
Business Acquisition [Line Items]
Percent interest acquired (as a percent)				25.00%
Subsequent Event | Gateway Energy and Coal Company, LLC | SunCoke Energy Inc
Business Acquisition [Line Items]
Redemption premium				$7.70

Acquisitions_Haverhill_and_Mid

Acquisitions (Haverhill and Middletown) (Details) (USD $)

3 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

9-May-14

Jan. 23, 2013

Apr. 30, 2014

8-May-14

Business Acquisition [Line Items]

Adjustments to equity related to the acquisition

($338,000,000)

Proceeds from issuance of common units, net of offering costs

90,500,000

231,800,000

0

Term loan

399,000,000

183,200,000

399,000,000

183,200,000

Net income attributable to SunCoke Energy Partners L.P.

21,400,000

20,200,000

1,200,000

13,200,000

17,300,000

13,700,000

15,800,000

11,800,000

71,800,000

83,400,000

Noncontrolling Interest

Business Acquisition [Line Items]

Adjustments to equity related to the acquisition

-171,300,000

Common Units

Business Acquisition [Line Items]

Proceeds from issuance of private placement

1,800,000

General Partner

Business Acquisition [Line Items]

Adjustments to equity related to the acquisition

-2,900,000

Haverhill Coke Company LLC and Middletown Coke Company LLC

Business Acquisition [Line Items]

Percentage interest owned (as a percent)

33.00%

Consideration transferred to acquire business

365,000,000

Consideration retained for anticipated remediation cost

7,000,000

Proceeds from issuance of private placement

263,100,000

Net income attributable to SunCoke Energy Partners L.P.

56,000,000

Adjustments to equity related to the acquisition

-170,100,000

Change from net income attributable to SunCoke Energy Partners, L.P. and transfers to noncontrolling interest

-114,100,000

Haverhill Coke Company LLC and Middletown Coke Company LLC | Revolving Credit Facility

Business Acquisition [Line Items]

Increase in line of credit availability

100,000,000

Credit facility available

250,000,000

250,000,000

250,000,000

Haverhill Coke Company LLC and Middletown Coke Company LLC | Senior Notes, Due 2020

Business Acquisition [Line Items]

Term loan

250,000,000

Interest rate on partnership notes (as a percent)

7.38%

Debt issuance cost

4,900,000

Debt issuance cost immediately expensed

900,000

800,000

Proceeds to fund interest

5,000,000

Haverhill Coke Company LLC and Middletown Coke Company LLC | Line of Credit | Revolving Credit Facility

Business Acquisition [Line Items]

Line of Credit Amendment Fee

1,800,000

Haverhill Coke Company LLC and Middletown Coke Company LLC | Sun Coal & Coke

Business Acquisition [Line Items]

Percent interest acquired, subsequent additions (as a percent)

2.00%

35.00%

Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Inc

Business Acquisition [Line Items]

Cash paid to SunCoke

3,400,000

Financing of acquisition, borrowings

271,300,000

Estimated market premium

11,400,000

Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Inc | Senior Notes, Due 2020

Business Acquisition [Line Items]

Financing of acquisition, borrowings

160,000,000

Haverhill Coke Company LLC and Middletown Coke Company LLC | Common Units

Business Acquisition [Line Items]

Private placement equity issued (in shares)

2,700,000

Private placement equity issued

80,000,000

Proceeds from issuance of common units, net of offering costs

88,700,000

Common units issued during the period (in shares)

3,200,000

Haverhill Coke Company LLC and Middletown Coke Company LLC | General Partner

Business Acquisition [Line Items]

Private placement equity issued

$3,300,000

Acquisitions_Purchase_Price_Al

Acquisitions (Purchase Price Allocation SunCoke Terminal) (Details) (USD $)	12 Months Ended			0 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 30, 2013
Business Acquisition [Line Items]
Cash	$0	$113.30	$0
SunCoke Lake Terminal LLC
Business Acquisition [Line Items]
Cash				28.6
Plant, property and equipment				25.9
Inventory				2.7
Total				$28.60

Acquisitions_Purchase_Price_Al1

Acquisitions (Purchase Price Allocation KRT) (Details) (Kanawha River Terminals LLC, USD $)	0 Months Ended
In Millions, unless otherwise specified	Oct. 01, 2013	Oct. 01, 2013	Sep. 30, 2013
Kanawha River Terminals LLC
Business Acquisition [Line Items]
Cash	$84.70	$84.70
Current assets	5.2	5.2
Plant, property and equipment	67.2	67.2
Intangible assets	7.9	7.9
Current liabilities	-3.7	-3.7
Other long-term liabilities	-0.1	-0.1
Total identifiable net assets assumed	76.5	76.5
Goodwill	8.2	8.2	8.2
Consideration transferred to acquire business	$84.70

Noncontrolling_Interest_Detail

Noncontrolling Interest (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Jan. 24, 2013	Jan. 23, 2013	9-May-14	8-May-14	Jan. 13, 2015
Noncontrolling Interest [Line Items]
Net income (loss) attributable to noncontrolling interest	$15.70	$40.80
IPO | SunCoke Energy Inc
Noncontrolling Interest [Line Items]
Interest in Partnership (as a percent)	54.00%
IPO | Sun Coal & Coke
Noncontrolling Interest [Line Items]
Interest in Partnership (as a percent)	35.00%
IPO | Haverhill Coke Company LLC and Middletown Coke Company LLC
Noncontrolling Interest [Line Items]
Interest in Partnership (as a percent)			65.00%	65.00%
IPO | Haverhill Coke Company LLC and Middletown Coke Company LLC | SunCoke Energy Inc
Noncontrolling Interest [Line Items]
Interest in Partnership (as a percent)	2.00%			35.00%
Haverhill Coke Company LLC and Middletown Coke Company LLC | Sun Coal & Coke
Noncontrolling Interest [Line Items]
Percent interest acquired (as a percent)					2.00%	35.00%
Subsequent Event | SunCoke Energy Inc
Noncontrolling Interest [Line Items]
Interest in Partnership (as a percent)							56.10%
Subsequent Event | Gateway Energy and Coal Company, LLC | Sun Coal & Coke
Noncontrolling Interest [Line Items]
Percent interest acquired (as a percent)							25.00%

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Allocated expenses	$23.40	$23.20	$27.50
Other SunCoke Entities
Related Party Transaction [Line Items]
Accounts receivable	3.1	6.4
Purchases	29.9	18.1
Coal logistics revenues
Related Party Transaction [Line Items]
Revenues	13.1	4.3
Other SunCoke Entities to Satisfy Commercial Agreements
Related Party Transaction [Line Items]
Revenues		19.2
Purchases		$6

Customer_Concentrations_Detail

Customer Concentrations (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Coke sales	$223.90	$216.80	$217.80	$214.50	$230.40	$219.50	$228.10	$253.70	$873	$931.70
Customer Concentration Risk
Concentration Risk [Line Items]
Tons of coke sold									2,400,000
Customer Concentration Risk | AK Steel Corporation and Arcelor Mittal USA, Inc.
Concentration Risk [Line Items]
Number of primary customers									3
Customer Concentration Risk | ArcelorMittal USA, Inc
Concentration Risk [Line Items]
Receivables due from customers	9.8								9.8
Coke sales									175.9	178.8	207.3
Customer Concentration Risk | ArcelorMittal USA, Inc | Sales revenue
Concentration Risk [Line Items]
Revenue from primary customers as a percentage of total revenue (as a percent)									20.10%	19.20%	20.40%
Customer Concentration Risk | AK Steel Corporation
Concentration Risk [Line Items]
Receivables due from customers	14.5								14.5
Coke sales									402.4	460.5	510.9
Customer Concentration Risk | AK Steel Corporation | Sales revenue
Concentration Risk [Line Items]
Revenue from primary customers as a percentage of total revenue (as a percent)									46.10%	49.40%	50.40%
Customer Concentration Risk | U.S. Steel
Concentration Risk [Line Items]
Receivables due from customers	6.4								6.4
Coke sales									$232.30	$245.80	$273.70
Customer Concentration Risk | U.S. Steel | Sales revenue
Concentration Risk [Line Items]
Revenue from primary customers as a percentage of total revenue (as a percent)									26.60%	26.40%	27.00%

Cash_Distributions_and_Net_Inc2

Cash Distributions and Net Income Per Unit (Details) (USD $)	0 Months Ended					3 Months Ended		11 Months Ended	12 Months Ended		0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Nov. 28, 2014	Nov. 14, 2014	Aug. 29, 2014	30-May-14	Aug. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jan. 26, 2015
Distribution paid per unit (in dollar per unit)	$0.53		$0.52	$0.50		$0.54	$0.48		$2.08	$1.64
Distributions paid		$20.50		$19.20	$19.80			$1.20	$2.60
Allocation to general partner (as a percent)									100.00%
Subsequent Event
Distribution declared per unit (in dollar per unit)											$0.54

Cash_Distributions_and_Net_Inc3

Cash Distributions and Net Income Per Unit Distributions Percentage Allocations (Details) (USD $)	11 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Marginal percentage interest in distributions (as a percent)	2.00%	2.00%
Total quarterly distribution per unit target amount (in dollars per share)		$0.47
Minimum Quarterly Distribution | Minimum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.41
Minimum Quarterly Distribution | Unitholders
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Margin percentage interest in distributions in excess of threshold (as a percent)		98.00%
Minimum Quarterly Distribution | General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Margin percentage interest in distributions in excess of threshold (as a percent)		2.00%
First Target Distribution
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.41
First Target Distribution | Minimum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.41
First Target Distribution | Maximum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.47
First Target Distribution | Unitholders
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Marginal percentage interest in distributions (as a percent)		98.00%
Margin percentage interest in distributions in excess of threshold (as a percent)		98.00%
First Target Distribution | General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Marginal percentage interest in distributions (as a percent)		2.00%
Margin percentage interest in distributions in excess of threshold (as a percent)		2.00%
Second Target Distribution
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.41
Second Target Distribution | Minimum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.47
Second Target Distribution | Maximum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.52
Second Target Distribution | Unitholders
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Marginal percentage interest in distributions (as a percent)		98.00%
Margin percentage interest in distributions in excess of threshold (as a percent)		85.00%
Second Target Distribution | General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Marginal percentage interest in distributions (as a percent)		2.00%
Margin percentage interest in distributions in excess of threshold (as a percent)		15.00%
Third Target Distribution
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.47
Third Target Distribution | Minimum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.52
Third Target Distribution | Maximum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.62
Third Target Distribution | Unitholders
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Marginal percentage interest in distributions (as a percent)		98.00%
Margin percentage interest in distributions in excess of threshold (as a percent)		75.00%
Third Target Distribution | General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Marginal percentage interest in distributions (as a percent)		2.00%
Margin percentage interest in distributions in excess of threshold (as a percent)		25.00%
Thereafter | Maximum
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Total quarterly distribution target amount (in dollars per share)		$0.68
Thereafter | Unitholders
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Margin percentage interest in distributions in excess of threshold (as a percent)		50.00%
Thereafter | General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Margin percentage interest in distributions in excess of threshold (as a percent)		50.00%

Cash_Distributions_and_Net_Inc4

Cash Distributions and Net Income Per Unit Allocation of Total Quarterly cash Distributions to General and Limited Partners (Details) (USD $)	0 Months Ended			3 Months Ended		12 Months Ended		3 Months Ended						11 Months Ended
In Millions, except Per Share data, unless otherwise specified	Nov. 28, 2014	Aug. 29, 2014	30-May-14	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General partner's distribution				$0.90	$0.40	$2.60	$1.20
Limited partners' distributions				20.3	14.8	78.1	51.2
Total cash distributions				21.2	15.2	80.7	52.4
Cash distributions per unit applicable to limited partners (in dollar per share)	$0.53	$0.52	$0.50	$0.54	$0.48	$2.08	$1.64
Subordinated Units
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Cash distributions per unit applicable to limited partners (in dollar per share)				$0.53	$0.43			$0.52	$0.50	$0.48	$0.42	$0.31	$0
Limited Partner | Common Units
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Limited partners' distributions				11.8	7.4	45.3	25.6
Limited Partner | Subordinated Units
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Limited partners' distributions				8.5	7.4	32.8	25.6
General Partner's Interest | General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General partner's distribution				0.4	0.4	1.3	1.2
General Partner's Incentive Distribution | General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General partner's distribution				$0.50	$0	$1.30	$0							$0

Cash_Distributions_and_Net_Inc5

Cash Distributions and Net Income Per Unit Calculation of Earnings per Unit (Details) (USD $)	0 Months Ended			3 Months Ended								11 Months Ended	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Nov. 14, 2014	30-May-14	Aug. 30, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Net income attributable to all partners				$21.40	$20.20	$1.20	$13.20	$17.30	$13.70	$15.80	$11.80		$71.80	$83.40
General partner distributions (including incentive distribution rights)	20.5	19.2	19.8									1.2	2.6
Distributions (greater than) less than earnings												6.2	-24.7
Common Units
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Limited partners' distributions												25.6	45.3
Weighted average units outstanding (basic) (in shares)												15.7	19.7
Earnings per share, basic and diluted (in dollar per share)												$1.81	$1.58
Subordinated Units
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Limited partners' distributions												25.6	32.8
Weighted average units outstanding (basic) (in shares)												15.7	15.7
Earnings per share, basic and diluted (in dollar per share)												$1.81	$1.43
General Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General partner distributions (including incentive distribution rights)												1.2	2.6
Distributions (greater than) less than earnings												0.4	-0.2
Total partner earnings												26.4	18.2
Limited Partner
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General partner distributions (including incentive distribution rights)												25.6	45.3
Distributions (greater than) less than earnings												2.9	-14.2
Total partner earnings												28.5	31.1
Limited Partner Subordinated
Incentive Distribution Made to Managing Member or General Partner [Line Items]
General partner distributions (including incentive distribution rights)												25.6	32.8
Distributions (greater than) less than earnings												2.9	-10.3
Total partner earnings												28.5	22.5
Predecessor
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Net income attributable to all partners													15.8	24.8	82.8
Successor
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Net income attributable to all partners												$58.60	$56	$58.60	$0

Cash_Distributions_and_Net_Inc6

Cash Distributions and Net Income Per Unit Unit Activity (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common Units
Limited Partners' Capital Account [Line Items]
Units outstanding, beginning of period (in shares)	15,713,153		0
Units sold in private placement (in shares)	62,956
Units outstanding, end of period (in shares)	21,693,916		0
Common Units | Haverhill Coke Company LLC and Middletown Coke Company LLC
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)	5,915,055
Common Units | Director
Limited Partners' Capital Account [Line Items]
Units issued during the period (in shares)	2,752	3,456
Common Units | IPO
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)		15,709,697
Public | Common Units
Limited Partners' Capital Account [Line Items]
Units outstanding, beginning of period (in shares)	13,503,456		0
Units sold in private placement (in shares)	62,956
Units outstanding, end of period (in shares)	16,789,164		0
Public | Common Units | Haverhill Coke Company LLC and Middletown Coke Company LLC
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)	3,220,000
Public | Common Units | Director
Limited Partners' Capital Account [Line Items]
Units issued during the period (in shares)	2,752	3,456
Public | Common Units | IPO
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)		13,500,000
SunCoke Energy Inc | Common Units - Parent
Limited Partners' Capital Account [Line Items]
Units outstanding, beginning of period (in shares)	2,209,697		0
Units sold in private placement (in shares)	0
Units outstanding, end of period (in shares)	4,904,752		0
SunCoke Energy Inc | Common Units - Parent | Haverhill Coke Company LLC and Middletown Coke Company LLC
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)	2,695,055
SunCoke Energy Inc | Common Units - Parent | Director
Limited Partners' Capital Account [Line Items]
Units issued during the period (in shares)	0	0
SunCoke Energy Inc | Common Units - Parent | IPO
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)		2,209,697
SunCoke Energy Inc | Subordinated Units
Limited Partners' Capital Account [Line Items]
Units outstanding, beginning of period (in shares)	15,709,697		0
Units sold in private placement (in shares)	0
Units outstanding, end of period (in shares)	15,709,697		0
SunCoke Energy Inc | Subordinated Units | Haverhill Coke Company LLC and Middletown Coke Company LLC
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)	0
SunCoke Energy Inc | Subordinated Units | Director
Limited Partners' Capital Account [Line Items]
Units issued during the period (in shares)	0	0
SunCoke Energy Inc | Subordinated Units | IPO
Limited Partners' Capital Account [Line Items]
Units issued in conjunction with IPO (in shares)		15,709,697

Cash_Distributions_and_Net_Inc7

Cash Distributions and Net Income Per Unit Allocation of Net Income (Details) (USD $)	3 Months Ended								12 Months Ended			11 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Sales and other operating revenue	$223.90	$216.80	$217.80	$214.50	$230.40	$219.50	$228.10	$253.70	$873	$931.70
Cost of products sold and operating expenses									656.3	715.4
Selling, general and administrative expenses									27.3	28.3
Depreciation and amortization expense									54.3	46.6	46.4
Total costs and operating expenses									737.9	790.3
Operating income									135.1	141.4
Interest expense, net									37.1	15.4	10.3
Income before income tax expense									98	126
Income tax expense									10.5	1.8	23.3
Net income	23.9	27.1	10.8	25.7	34	31	30.4	28.8	87.5	124.2	82.8
Less: Net income attributable to noncontrolling interests									15.7	40.8
Net income attributable to all partners	21.4	20.2	1.2	13.2	17.3	13.7	15.8	11.8	71.8	83.4
Successor
Income tax expense									1.2	0.8	0
Net income									87.5	124.2
Net income attributable to all partners									$56	$58.60	$0	$58.60

Cash_Distributions_and_Net_Inc8

Cash Distributions and Net Income Per Unit Calculation of Net Income Allocated to the General and Limited Partners (Details) (USD $)	3 Months Ended								11 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to SunCoke Energy Partners L.P.	$21.40	$20.20	$1.20	$13.20	$17.30	$13.70	$15.80	$11.80		$71.80	$83.40
General partner's incentive distribution rights	0.9				0.4					2.6	1.2
Net income available to general and limited partners									58.6	54.7
Marginal percentage interest in distributions (as a percent)									2.00%	2.00%
General partner's interest in net income									26.4	18.2	26.4
Limited partners' interest in net income subsequent to initial public offering									57	53.6	57
Common Units - Public | Limited Partner
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited partners' interest in net income subsequent to initial public offering									24.5	23.8
Common Units - Parent | Limited Partner
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited partners' interest in net income subsequent to initial public offering									4	6.2
Subordinated Units | Limited Partner
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited partners' interest in net income subsequent to initial public offering									28.5	23.6
Incentive Distribution | General Partner
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
General partner's incentive distribution rights	0.5				0				0	1.3	0
General partner's interest in net income									0	1.3
Allocated Interest | General Partner
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
General partner's interest in net income									1.6	1.1
Predecessor
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to SunCoke Energy Partners L.P.										15.8	24.8	82.8
General partner's interest in net income										15.8	24.8
Successor
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to SunCoke Energy Partners L.P.									$58.60	$56	$58.60	$0

Income_Taxes_Details

Income Taxes (Details)	12 Months Ended
	Dec. 31, 2014	Jan. 24, 2013	Jan. 23, 2013
Subsidiary or Equity Method Investee [Line Items]
Period during which tax credits were earned (in years)	4 years
Haverhill Coke Company LLC and Middletown Coke Company LLC | IPO
Subsidiary or Equity Method Investee [Line Items]
Interest in Partnership (as a percent)		65.00%	65.00%

Income_Taxes_Components_of_Inc

Income Taxes Components of Income Taxes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax, Components of Income Tax Expense (Benefit [Line Items]
Total income tax	$10.50	$1.80	$23.30
Successor
Income Tax, Components of Income Tax Expense (Benefit [Line Items]
U.S. federal	0	0	0
U.S. state and local	1.2	0.8	0
Total income tax	1.2	0.8	0
Predecessor
Income Tax, Components of Income Tax Expense (Benefit [Line Items]
U.S. federal	7.5	-1.1	21.4
U.S. state and local	1.8	2.1	1.9
Total income tax	$9.30	$1	$23.30

Income_Taxes_Income_Tax_Expens

Income Taxes Income Tax Expense Reconciliation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Total income tax	$10.50	$1.80	$23.30
Successor
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense at U.S. statutory rate of 35 percent	25.4	35.1
Partnership income not subject to tax	-25.4	-35.1
State and local tax for Middletown and Granite City Operations	1.1	0.5
Other	0.1	0.3
Total income tax	$1.20	$0.80	$0
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation (as a percent)
Income tax expense at U.S. statutory rate of 35 percent (as percent)	35.00%	35.00%
Partnership income not subject to tax (as percent)	-35.00%	-35.00%
Local tax for Middletown operations (as percent)	1.50%	0.50%
Other (as percent)	0.20%	0.30%
Total Income Tax Expense (as percent)	1.70%	0.80%

Income_Taxes_Schedule_of_Defer

Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Deferred tax assets:
Federal and state credit carryforward	$77.80	$85.90
Federal net operating loss	49.5	48.9
State and local net operating loss	8.7	11.5
Other liabilities not yet deductible	3.3	3
Total deferred tax assets	139.3	149.3
Less valuation allowance	-3.6	-3.2
Deferred tax asset, net	135.7	146.1
Deferred tax liabilities:
Properties, plants and equipment	-112.8	-113.3
Other liabilities	-0.7	0
Total deferred tax liabilities	-113.5	-113.3
Net deferred tax asset	$22.20	$32.80

Income_Taxes_Deferred_Taxes_Ba

Income Taxes Deferred Taxes Balance Sheet Classification (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Income Tax Disclosure [Abstract]
Current asset	$0.60	$0.80
Deferred income taxes	21.6	32
Net deferred tax asset	$22.20	$32.80

Inventories_Details

Inventories (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]
Coal	$60.40	$48.80
Coke	2	4.6
Material, supplies, and other	28	27.6
Total Inventories	$90.40	$81

Properties_Plants_and_Equipmen2

Properties, Plants, and Equipment, Net (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Property, Plant and Equipment [Line Items]
Gross investment, at cost	$1,445.50	$1,381.90
Less: accumulated depreciation	-232.1	-182.2
Total Properties, Plant and Equipment, net	1,213.40	1,199.70
Coke and energy plant, machinery and equipment
Property, Plant and Equipment [Line Items]
Gross investment, at cost	1,251.30	1,194.40
Coal logistics plant, machinery and equipment
Property, Plant and Equipment [Line Items]
Gross investment, at cost	83.6	82.6
Land and land improvements
Property, Plant and Equipment [Line Items]
Gross investment, at cost	54.1	56.8
Construction-in-progress
Property, Plant and Equipment [Line Items]
Gross investment, at cost	43.3	37.4
Other
Property, Plant and Equipment [Line Items]
Gross investment, at cost	13.2	10.7
Coke and energy plant, machinery and equipment, subject to long-term contracts to sell coke and deemed to contain operating leases
Property, Plant and Equipment [Line Items]
Gross investment, at cost	793.4	790.3
Less: accumulated depreciation	($106.50)	($79.60)

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Oct. 01, 2013	Sep. 30, 2013
Business Acquisition [Line Items]
Amortization expense	$0.90	$0.10
Amortization 2015	0.8
Amortization 2016	0.8
Amortization 2017	0.8
Amortization 2018	0.8
Amortization 2019 and thereafter	0.6
Kanawha River Terminals LLC
Business Acquisition [Line Items]
Cash			84.7
Goodwill			8.2	8.2
Coal Logistics | Kanawha River Terminals LLC
Business Acquisition [Line Items]
Goodwill	$8.20	$8.20

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets The Components of Definite-lived Intangible Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	$7.90	$7.90
Accumulated Amortization	1	0.1
Net	6.9	7.8
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization	10 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	6.7	6.7
Accumulated Amortization	0.7	0.1
Net	6	6.6
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted - Average Remaining Amortization	4 years
Finite-Lived Intangible Assets, Net [Abstract]
Gross Carrying Amount	1.2	1.2
Accumulated Amortization	0.3	0
Net	$0.90	$1.20

Retirement_and_OtherPostEmploy

Retirement and Other-Post-Employment Benefits Plans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Partnership contributions	$3.20	$2.10	$1.70

Debt_Details

Debt (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 01, 2013	9-May-14	Aug. 28, 2013	Jan. 23, 2013	Jul. 26, 2011	Jan. 13, 2015	Apr. 21, 2015
Debt Instrument [Line Items]
Short-term debt	$0	$40,000,000
Accrued interest repaid	15,700,000	6,000,000
Term loan	399,000,000	183,200,000
Long-term debt assumed and repaid	276,300,000	225,000,000	0
Unamortized debt issuance expense	12,500,000	6,800,000
Repayments of Lines of Credit	80,000,000	0	0
Debt maturities, 2015	0
Debt maturities, 2016	0
Debt maturities, 2017	0
Debt maturities, 2018	0
Debt maturities, 2020	600,000,000
Subsequent Event
Debt Instrument [Line Items]
Senior notes									200,000,000
Kanawha River Terminals LLC
Debt Instrument [Line Items]
Financing of acquisition, borrowings				40,000,000
Haverhill Coke Company LLC and Middletown Coke Company LLC
Debt Instrument [Line Items]
Proceeds from issuance of private placement					263,100,000
Revolving Credit Facility | Kanawha River Terminals LLC
Debt Instrument [Line Items]
Financing of acquisition, borrowings				40,000,000
Weighted average interest rate on borrowings (as a percent)	2.39%
Revolving Credit Facility | Haverhill Coke Company LLC and Middletown Coke Company LLC
Debt Instrument [Line Items]
Credit facility available	250,000,000				250,000,000
IPO | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility fees						900,000	2,200,000
Revolving credit facility					250,000,000	150,000,000	100,000,000
Unamortized debt issuance expense							2,200,000
Credit facility, unused commitment fee (as a percent)	0.40%
IPO | Uncommitted Incremental Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility						100,000,000
Interest Expense | IPO | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs immediately expensed							2,900,000
Credit Agreement and Partner Revolver
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	4
Minimum consolidated interest coverage ratio	2.5
Credit Agreement and Partner Revolver | Subsequent Event
Debt Instrument [Line Items]
Maximum consolidated leverage ratio										4.5
Line of Credit | Revolving Credit Facility | Haverhill Coke Company LLC and Middletown Coke Company LLC
Debt Instrument [Line Items]
Repayments of Lines of Credit					40,000,000
Line of Credit Amendment Fee					1,800,000
Term Loans
Debt Instrument [Line Items]
Term loan								225,000,000
Credit facility fees								5,700,000
Allocated interest expense and amortization of debt issuance cost	300,000	600,000	10,300,000
Term Loans | IPO
Debt Instrument [Line Items]
Long-term debt assumed and repaid							225,000,000
Senior Notes, Due 2020
Debt Instrument [Line Items]
Original issue premium					13,100,000
Senior Notes, Due 2020 | Haverhill Coke Company LLC and Middletown Coke Company LLC
Debt Instrument [Line Items]
Interest rate on debt (as a percent)					7.38%
Term loan					250,000,000
Credit facility fees					4,900,000
Debt issuance cost immediately expensed					900,000		800,000
Proceeds to fund interest					5,000,000
Senior Notes, Due 2020 | Gateway Energy and Coal Company, LLC | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt (as a percent)									7.63%
Senior Notes, Due 2020 | IPO
Debt Instrument [Line Items]
Interest rate on debt (as a percent)							7.38%
Partnership notes issued							150,000,000
Percentage of partnership notes that may be redeemed (as a percent)							35.00%
Senior Notes | Subsequent Event
Debt Instrument [Line Items]
Accrued interest repaid									5,600,000
Long-term debt assumed and repaid									135,000,000
Senior Notes | Gateway Energy and Coal Company, LLC | Subsequent Event
Debt Instrument [Line Items]
Interest rate on debt (as a percent)									7.38%
Senior Notes | IPO
Debt Instrument [Line Items]
Credit facility fees							3,700,000
SunCoke Energy Inc | Haverhill Coke Company LLC and Middletown Coke Company LLC
Debt Instrument [Line Items]
Financing of acquisition, borrowings					271,300,000
Redemption premium					11,400,000
Debt extinguishment costs					3,100,000
SunCoke Energy Inc | Gateway Energy and Coal Company, LLC | Subsequent Event
Debt Instrument [Line Items]
Redemption premium									7,700,000
SunCoke Energy Inc | Term Loans | Haverhill Coke Company LLC and Middletown Coke Company LLC
Debt Instrument [Line Items]
Financing of acquisition, borrowings					99,900,000
SunCoke Energy Inc | Term Loans | Credit Agreement | IPO
Debt Instrument [Line Items]
Interest rate on debt (as a percent)								1.00%
SunCoke Energy Inc | Term Loans | Credit Agreement | Base Rate
Debt Instrument [Line Items]
Margin on term loans (as a percent)								2.00%
SunCoke Energy Inc | Term Loans | Credit Agreement | LIBOR
Debt Instrument [Line Items]
Margin on term loans (as a percent)								3.00%
SunCoke Energy Inc | Senior Notes, Due 2020 | Haverhill Coke Company LLC and Middletown Coke Company LLC
Debt Instrument [Line Items]
Financing of acquisition, borrowings					$160,000,000

Debt_Schedule_of_Long_Term_Deb

Debt - Schedule of Long Term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt	$411,500,000	$149,700,000
Debt issuance costs	-12,500,000	-6,800,000
Long-term debt	399,000,000	183,200,000
Senior Notes, Due 2020 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	411,500,000	150,000,000
Interest rate on debt (as a percent)	7.38%
Unamortized premium	11,500,000
Partnership Revolver [Member] | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$0	$40,000,000

Commitments_and_Contingent_Lia2

Commitments and Contingent Liabilities (Details) (USD $)	1 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014	9-May-14	Jan. 23, 2013	Dec. 31, 2013
Haverhill and Granite City
Loss Contingencies [Line Items]
Civil penalty paid	$2.20
Environmental capital expenditures		68
Haverhill Coke Company LLC and Middletown Coke Company LLC | IPO
Loss Contingencies [Line Items]
Environmental capital expenditures retained		119	7	67
SunCoke Energy Inc | Predecessor | Haverhill and Granite City
Loss Contingencies [Line Items]
Environmental capital expenditures					$7

Commitments_and_Contingent_Lia3

Commitments and Contingent Liabilities Future Minimum Annual Rentals (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]
2015	$1.60
2016	0.9
2017	0.4
2018	0.4
2019	0.4
2020-Thereafter	0.3
Total	$4

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt assumed by SunCoke Energy Partners, L.P.	$259.90	$225
Accounts receivable	0	39.6
Deferred taxes	0	18.3
Cash interest payments	15.7	6
Predecessor
Debt assumed by SunCoke Energy Partners, L.P.			0
Accounts receivable			0
Deferred taxes			$0

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of the Partnership's long-term debt	$415.70	$156.50
Carrying value of Partnership's long-term debt	411.5	149.7
Cash Equivalents | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$0	$12

Equity_Distribution_Agreement_

Equity Distribution Agreement (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Aug. 05, 2014
Common Units
Limited Partners' Capital Account [Line Items]
Limited partner common units authorized for sale in private placement		$75,000,000
Proceeds from issuance of private placement	1,800,000
Limited partner common units authorized for sale, remaining units	$73,200,000
Common Units
Limited Partners' Capital Account [Line Items]
Shares sold in private placement	62,956
Common Units | Public
Limited Partners' Capital Account [Line Items]
Shares sold in private placement	62,956

Business_Segment_Information_S

Business Segment Information Segment Results (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									T
Segment Reporting Information [Line Items]
Coal handling capacity (in tons)									30,000,000
Sales and other operating revenue	$223.90	$216.80	$217.80	$214.50	$230.40	$219.50	$228.10	$253.70	$873	$931.70
Adjusted EBITDA									188.9	194.8	174
Depreciation and amortization expense									54.3	46.6
Capital Expenditure									67.6	46.2
Segment assets, excluding tax assets	1,395.40				1,377.30				1,395.40	1,377.30
Tax assets	21.6				32				21.6	32
Assets	1,417				1,409.30				1,417	1,409.30
Domestic Coke
Segment Reporting Information [Line Items]
Adjusted EBITDA									181.8	196.9
Depreciation and amortization expense									46.7	44.8
Capital Expenditure									64.7	46
Segment assets, excluding tax assets	1,264.10				1,234				1,264.10	1,234
Coal logistics revenues
Segment Reporting Information [Line Items]
Adjusted EBITDA									14.3	4.7
Depreciation and amortization expense									7.6	1.8
Capital Expenditure									2.9	0.2
Segment assets, excluding tax assets	116.6				120.6				116.6	120.6
Corporate and Other
Segment Reporting Information [Line Items]
Adjusted EBITDA									-7.2	-6.8
Segment assets, excluding tax assets	14.7				22.7				14.7	22.7
Operating Segments | Domestic Coke
Segment Reporting Information [Line Items]
Sales and other operating revenue									823.7	919.3
Operating Segments | Coal logistics revenues
Segment Reporting Information [Line Items]
Sales and other operating revenue									49.3	12.4
Operating Segments | Coal Logistics Intersegment Sales
Segment Reporting Information [Line Items]
Sales and other operating revenue									5.7	1.2
Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenue									($5.70)	($1.20)

Business_Segment_Information_O

Business Segment Information Operating Revenue by Product or Service (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Sales and other operating revenue	$223.90	$216.80	$217.80	$214.50	$230.40	$219.50	$228.10	$253.70	$873	$931.70
Predecessor
Segment Reporting Information [Line Items]
Sales and other operating revenue											1,013.90
Cokemaking revenues
Segment Reporting Information [Line Items]
Sales and other operating revenue									757.9	853.6
Cokemaking revenues | Predecessor
Segment Reporting Information [Line Items]
Sales and other operating revenue											951.5
Energy revenues
Segment Reporting Information [Line Items]
Sales and other operating revenue									65.7	65.6
Energy revenues | Predecessor
Segment Reporting Information [Line Items]
Sales and other operating revenue											62.4
Coal logistics revenues
Segment Reporting Information [Line Items]
Sales and other operating revenue									47.4	11.2
Coal logistics revenues | Predecessor
Segment Reporting Information [Line Items]
Sales and other operating revenue											0
Other revenues
Segment Reporting Information [Line Items]
Sales and other operating revenue									2	1.3
Other revenues | Predecessor
Segment Reporting Information [Line Items]
Sales and other operating revenue											$0

Business_Segment_Information_R

Business Segment Information Reconciliation of Adjusted EBITDA (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Adjusted EBITDA attributable to SunCoke Energy Partners, L.P.									$130.90	$103.50	$0
Add: Adjusted EBITDA attributable to noncontrolling interest									19.7	51.7	0
Adjusted EBITDA									188.9	194.8	174
Depreciation and amortization expense									54.3	46.6	46.4
Interest expense, net									37.1	15.4	10.3
Income tax expense									10.5	1.8	23.3
Sales discounts related to tax credits owed to customers									-0.5	6.8	11.2
Net income	23.9	27.1	10.8	25.7	34	31	30.4	28.8	87.5	124.2	82.8
Predecessor
Segment Reporting Information [Line Items]
Add: Adjusted EBITDA attributable to Predecessors(1)									38.3	39.6	174
Depreciation and amortization expense											46.4
Interest expense, net											10.3
Income tax expense									9.3	1	23.3
Net income											82.8
Granite City
Segment Reporting Information [Line Items]
Accrued sales discounts					13.6					13.6
Settlement of fuel tax credit obligation				13.1
Gain (loss) on settlement of fuel tax credit obligation				$0.50

Selected_Quarterly_Data_Detail

Selected Quarterly Data (Details) (USD $)	0 Months Ended			3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Nov. 28, 2014	Aug. 29, 2014	30-May-14	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Data [Line Items]
Sales and other operating revenue				$223.90	$216.80	$217.80	$214.50	$230.40	$219.50	$228.10	$253.70	$873	$931.70
Gross profit				38.8	45.5	42.6	35.5	43	41.6	39.9	45.2
Net income				23.9	27.1	10.8	25.7	34	31	30.4	28.8	87.5	124.2	82.8
Net income attributable to SunCoke Energy Partners L.P.				$21.40	$20.20	$1.20	$13.20	$17.30	$13.70	$15.80	$11.80	$71.80	$83.40
Cash distributions per unit applicable to limited partners (in dollar per share)	$0.53	$0.52	$0.50	$0.54				$0.48				$2.08	$1.64
Common Units
Selected Quarterly Data [Line Items]
Net income per limited partner unit (basic and diluted) (in dollars per share)				$0.55	$0.52	$0.03	$0.41	$0.53	$0.43	$0.49	$0.37
Subordinated Units
Selected Quarterly Data [Line Items]
Net income per limited partner unit (basic and diluted) (in dollars per share)				$0.55	$0.52	$0.02	$0.41	$0.53	$0.43	$0.49	$0.37
Cash distributions per unit applicable to limited partners (in dollar per share)				$0.53	$0.52	$0.50	$0.48	$0.43	$0.42	$0.31	$0