Sisecam Resources (SIRE) 10-K6 Mar 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Dec. 31, 2014	Jun. 30, 2014	Mar. 02, 2015
Document and Entity Information
Entity Registrant Name	OCI Resources LP.
Entity Central Index Key	1575051
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float		$127,450,000
Common Unitholders
Document and Entity Information
Entity Common Stock, Shares Outstanding			9,801,027
Subordinated Units
Document and Entity Information
Entity Common Stock, Shares Outstanding			9,775,500
General Partner
Document and Entity Information
Entity Common Stock, Shares Outstanding			399,000

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$31	$46.90
Accounts receivable, net	35.5	34.4
Accounts receivable - ANSAC	70.4
Due from affiliates, net	19.6
Inventory	43.2	41.7
Other current assets	1.8
Total current assets	201.5
Property, plant and equipment, net	245	238
Other non-current assets	0.9
Total assets	447.4
Current liabilities:
Current portion of long-term debt	0	0
Accounts payable	13.1
Due to affiliates	7.1
Accrued expenses	29.5
Total current liabilities	49.7
Long-term debt	145
Other non-current liabilities	4.2	3.8
Total liabilities	198.9
Commitments and Contingencies (See Note 13)
Equity:
General partner unitholders - OCI Resource Partners LLC (0.4 million units issued and outstanding at December 31, 2014 and 2013, respectively)	3.8
Accumulated other comprehensive loss	-0.4
Partners' capital attributable to OCI Resources LP	147.6
Non-controlling interests	100.9
Total equity	248.5	241.3
Total liabilities and partners' equity	447.4
Common Units
Equity:
Common and subordinated unitholders	106.3
Subordinated Unitholders - OCI Holdings
Equity:
Common and subordinated unitholders	37.9
Predecessor
Current assets:
Cash and cash equivalents		46.9
Accounts receivable, net		34.4
Accounts receivable - ANSAC		58.1
Due from affiliates, net		20.4
Inventory		41.7
Other current assets		1.2
Total current assets		202.7
Property, plant and equipment, net		238
Other non-current assets		1.3
Total assets		442
Current liabilities:
Accounts payable		13.2
Due to affiliates		2.3
Accrued expenses		26.4
Total current liabilities		41.9
Long-term debt		155
Other non-current liabilities		3.8
Total liabilities		200.7
Commitments and Contingencies (See Note 13)
Equity:
General partner unitholders - OCI Resource Partners LLC (0.4 million units issued and outstanding at December 31, 2014 and 2013, respectively)		3.8
Accumulated other comprehensive loss		-0.3
Partners' capital attributable to OCI Resources LP		144.6
Non-controlling interests		96.7
Total equity		241.3
Total liabilities and partners' equity		442
Predecessor \| Common Units
Equity:
Common and subordinated unitholders		104.5
Predecessor \| Subordinated Unitholders - OCI Holdings
Equity:
Common and subordinated unitholders		$36.60

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical)	Dec. 31, 2014	Dec. 31, 2013
General Partners' Capital Account, Units Issued	399,000	399,000
General Partners' Capital Account, Units Outstanding	399,000	399,000
Common Units
Common and subordinated units issued	9,801,830	9,775,500
Common and subordinated units outstanding	9,801,830	9,775,500
Subordinated Unitholders - OCI Holdings
Common and subordinated units issued	9,775,500	9,775,500
Common and subordinated units outstanding	9,775,500	9,775,500

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales:
Sales - Affiliates	$236.70	$211.60	$236.90
Sales - others	228.3
Total net sales	465	465	442.1
Cost of products sold:
Cost of products sold	201.6
Depreciation, Depletion and Amortization, Not Including Amortization of Loan Financing Costs	22.4
Depreciation, Depletion and Amortization	22.8	23.9	23.7
Freight costs	123.7
Total cost of products sold	347.7
Gross profit	117.3
Operating expenses:
Selling, general and administrative expenses - others	3.3		0.7
Selling, general and administrative expenses - Affiliates	17	12.5	11.1
Loss on disposal of assets, net	1	0	0
Total operating expenses	21.3
Operating income	96
Other income/(expenses):
Interest income	0
Interest expense	-5.2
Other - net	1.1
Total other income/(expense), net	-4.1
Income before provision for income taxes	91.9
Provision for income taxes	0	7.1
Net income	91.9		101
Net income attributable to non-controlling interest	47.4
Less: Predecessor net income prior to initial public offering on September 18, 2013	0	13.3
Net income attributable to OCI Resources LP subsequent to initial public offering	44.5	13
Other comprehensive loss:
Income (loss) on derivative financial instruments	-0.2
Comprehensive income	91.7
Comprehensive income attributable to non-controlling interest	47.3
Comprehensive income attributable to OCI Resources LP/Predecessor	44.4
Less: Predecessor comprehensive income prior to initial public offering on September 18, 2013	0	13.1
Comprehensive income attributable to OCI Resources LP subsequent to initial public offering	44.4	13.2
Common unit
Other comprehensive loss:
Net income per common and subordinated unit (basic and diluted) (dollars per share)	$2.23	$0.65
Weighted average common and subordinated units outstanding (basic and diluted) (shares)	9.8	9.8
Subordinated unit
Other comprehensive loss:
Net income per common and subordinated unit (basic and diluted) (dollars per share)	$2.23	$0.65
Weighted average common and subordinated units outstanding (basic and diluted) (shares)	9.8	9.8
Predecessor
Net sales:
Sales - Affiliates		211.6	236.9
Sales - others		230.5	225.7
Total net sales		442.1	462.6
Cost of products sold:
Cost of products sold		202.4	197.7
Depreciation, Depletion and Amortization, Not Including Amortization of Loan Financing Costs		23.9
Depreciation, Depletion and Amortization		23.9	23.7
Freight costs		122.7	110.1
Total cost of products sold		349	331.5
Gross profit		93.1	131.1
Operating expenses:
Selling, general and administrative expenses - others		0.7
Selling, general and administrative expenses - Affiliates		12.5
Total operating expenses		13.2	11.8
Operating income		79.9	119.3
Other income/(expenses):
Interest income		0	0.2
Interest expense		-2.9	-1.5
Other - net		0.7	-0.6
Total other income/(expense), net		-2.2	-1.9
Income before provision for income taxes		77.7	117.4
Provision for income taxes		7.1	16.4
Net income		70.6	101
Net income attributable to non-controlling interest		44.3	65.9
Net income attributable to OCI Resources LP/Predecessor		26.3	35.1
Other comprehensive loss:
Income (loss) on derivative financial instruments		0	0
Comprehensive income		70.6	101
Comprehensive income attributable to non-controlling interest		44.3	65.9
Comprehensive income attributable to OCI Resources LP/Predecessor		$26.30	$35.10

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$91.90		$101
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization expense	22.8	23.9	23.7
Loss on disposal of assets, net	1
Equity-based compensation expense	0.4
Deferred income taxes	0	0.3
Other non-cash items	-0.2
Changes in operating assets and liabilities:
Accounts receivable - net	-1.1
Accounts receivable - ANSAC	-12.3
Inventory	-1.5
Other current and other non-current assets	0
Due from affiliates, net	0.8
Increase/(decrease) in:
Accounts payable	-3.5
Due to affiliates	4.8
Accrued expenses and other liabilities	3
Net cash provided by operating activities	106.1
Cash flows from investing activities:
Capital expenditures	-27.2
Net cash used in investing activities	-27.2
Cash flows from financing activities:
Proceeds from issuance of common units, net of offering costs	0
Distribution of IPO proceeds to Predecessor and its affiliate	0
Proceeds from issuance of revolving credit facility	0
Repayments of long-term debt	-10
Partners' Capital Account, Distributions			74.5
Distributions to Predecessor	0
Distributions to non-controlling interest	-43
Net cash used in financing activities	-94.8
Net (decrease)/increase in cash and cash equivalents	-15.9
Cash and cash equivalents at beginning of year	46.9
Cash and cash equivalents at end of year	31	46.9
Supplemental disclosure of cash flow information:
Interest paid during the year	4.3
Supplemental disclosure of non-cash operating activities:
Predecessor net liabilities not assumed by the Partnership	0
Supplemental disclosure of non-cash investing activities:
Capital expenditures on account	4.6
Predecessor
Cash flows from operating activities:
Net income		70.6	101
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization expense		23.9	23.7
Loss on disposal of assets, net		0	0
Equity-based compensation expense		0	0
Deferred income taxes		0.3	-0.2
Other non-cash items		0	0
Changes in operating assets and liabilities:
Accounts receivable - net		0.8	-3.5
Accounts receivable - ANSAC		-4.2	-6
Inventory		0	-10
Other current and other non-current assets		-2	0.2
Due from affiliates, net		5.5	-13.5
Increase/(decrease) in:
Accounts payable		0.1	-1.6
Due to affiliates		5.6	16.9
Accrued expenses and other liabilities		-0.3	-5.2
Net cash provided by operating activities		100.3	101.8
Cash flows from investing activities:
Capital expenditures		-16.2	-27.4
Net cash used in investing activities		-16.2	-27.4
Cash flows from financing activities:
Proceeds from issuance of common units, net of offering costs		83.3	0
Distribution of IPO proceeds to Predecessor and its affiliate		-83.3	0
Proceeds from issuance of revolving credit facility		135	0
Repayments of long-term debt		-32	-4
Partners' Capital Account, Distributions		0	0
Distributions to Predecessor		-72.9	-30.5
Distributions to non-controlling interest		-90	-44
Net cash used in financing activities		-59.9	-78.5
Net (decrease)/increase in cash and cash equivalents		24.2	-4.1
Cash and cash equivalents at beginning of year		22.7	26.8
Cash and cash equivalents at end of year		46.9	22.7
Supplemental disclosure of cash flow information:
Interest paid during the year		2.3	1.5
Supplemental disclosure of non-cash operating activities:
Predecessor net liabilities not assumed by the Partnership		61.5	0
Supplemental disclosure of non-cash investing activities:
Capital expenditures on account		0.8	0.8
Common Units
Cash flows from financing activities:
Partners' Capital Account, Distributions	-20.5
Subordinated unit
Cash flows from financing activities:
Partners' Capital Account, Distributions	-20.5
General Partner
Cash flows from financing activities:
Partners' Capital Account, Distributions	($0.80)

CONSOLIDATED_STATEMENTS_OF_EQU

CONSOLIDATED STATEMENTS OF EQUITY (USD $)	Total	Common Units	General Partner	Partnership units	Partnership units	Partnership units	Accumulated Other Comprehensive Loss	Partners' Capital Attributable to OCIR and Predecessor's Net Equity	Noncontrolling Interests	Predecessor Capital Account [Member]	Predecessor
In Millions, unless otherwise specified	Total	Common Units	General Partner	Common Units	Subordinated Units	General Partner	Accumulated Other Comprehensive Loss		Noncontrolling Interests	Predecessor Capital Account [Member]	Predecessor
BALANCE, beginning of period at Dec. 31, 2011	$245.80						($0.20)	$125.20	$120.60	$125.40
Increase (decrease) in shareholders' equity
Net income	101							35.1	65.9	35.1	101
Distributions	-74.5							-30.5	-44	-30.5	0
BALANCE, end of period at Dec. 31, 2012	272.3						-0.2	129.8	142.5	130
Increase (decrease) in shareholders' equity
Net income	44.1							13.3	30.8	13.3
Distributions	-162.9							-72.9	-90	-72.9
BALANCE, end of period at Sep. 18, 2013	153.5							70.2	83.3	70.4
BALANCE, beginning of period at Dec. 31, 2012							-0.2
Increase (decrease) in shareholders' equity
Net income											70.6
Distributions											0
BALANCE, end of period at Dec. 31, 2013											241.3
BALANCE, beginning of period at Sep. 18, 2013	153.5						-0.2	70.2	83.3	70.4
Increase (decrease) in shareholders' equity
Net income	26.5			6.3	6.4	0.3		13	13.5
Net liabilities not assumed by the Partnership	61.3			0	0	0	-0.1	61.4	-0.1	61.5
Allocation of net Predecessor investment to unitholders				42.2	86.2	3.5				-131.9
Proceeds from initial public offering, net	83.3			83.3				83.3
Distribution of IPO proceeds to Predecessor and its affiliate	-83.3			-27.3	-56			-83.3
BALANCE, end of period at Dec. 31, 2013	241.3			104.5	36.6	3.8	-0.3	144.6	96.7
Increase (decrease) in shareholders' equity
Net income	91.9			21.9	21.8	0.8		44.5	47.4
Equity-based compensation plan activity	0.4			0.4	0			0.4		0
Distributions		20.5	0.8
Allocation of net Predecessor investment to unitholders				-20.5	-20.5
Distribution of IPO proceeds to Predecessor and its affiliate	-84.8					-0.8		-41.8	-43	0
Interest rate swap adjustment	-0.2			0	0	0	-0.1	-0.1	-0.1	0
BALANCE, end of period at Dec. 31, 2014	$248.50			$106.30	$37.90	$3.80	($0.40)	$147.60	$100.90

GENERAL

GENERAL	12 Months Ended
GENERAL	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
GENERAL	GENERAL
	Nature of Operations
	As used in this Report, the terms "OCI Resources LP," "OCI Resources," the "Partnership," "OCIR," "we," "us," or "our" may refer to OCI Resources LP, which is a Delaware limited partnership formed on April 22, 2013 by OCI Wyoming Holding Co. ("OCI Holdings"), a wholly-owned subsidiary of OCI Chemical Corporation ("OCI Chemical"). On September 18, 2013, the Partnership completed the initial public offering (“IPO”) of its common units representing limited partner interests (the "Common Units"). The Partnership owns a controlling interest of 51.0% membership interest in OCI Wyoming LLC ("OCI Wyoming"). The Partnership’s operations consist solely of its investment in OCI Wyoming, which is in the business of mining trona ore to produce soda ash. All soda ash processed is sold to various domestic, Korean and European customers and to American Natural Soda Ash Corporation ("ANSAC") which is an affiliate for export. All mining and processing activities take place in one facility located in the Green River Basin of Wyoming. On June 30, 2014, OCI Wyoming converted from a Delaware limited partnership to a Delaware limited liability company.
	NRP Trona LLC, a wholly owned subsidiary of Natural Resource Partners LP ("NRP"), currently owns a 49.0% membership interest in OCI Wyoming. NRP acquired its interest in OCI Wyoming in January 2013 from Anadarko Holding Company ("Anadarko").

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation and Significant Accounting Policies
	The accompanying consolidated financial statements of the Partnership and its subsidiary have been prepared in conformity with U.S. generally accepted accounting principles. All adjustments and elimination of significant intercompany balances necessary for a fair presentation of the Partnership’s results of operations, financial position and cash flows for the periods presented have been made. All such adjustments are of a normal recurring nature. The year ended December 31, 2013, includes the combined results of OCI Holdings and its subsidiary (the "Predecessor") through September 17, 2013 and the Partnership for the period from September 18, 2013 through December 31, 2013 and unless otherwise noted, financial information for the Predecessor and the Partnership is presented before non-controlling interest. For periods prior to the IPO, the accompanying consolidated financial statements and related notes present the historical accounts of the Predecessor. To the extent they relate to periods prior to the IPO, the results are not necessarily indicative of the actual results of operations that might have occurred if we had operated as the restructured public entity during that pre-IPO period.
	Non-controlling interests
	Prior to the completion of the IPO and the restructuring transaction completed in connection therewith (the "Restructuring"), non-controlling interests in the consolidated financial statements of the Predecessor represented the 1.0% limited partner interest in OCI Wyoming owned by Wyoming Co. and the 48.51% general partner interest in OCI Wyoming owned by Anadarko, and subsequently acquired by NRP. Subsequent to the Restructuring and IPO, non-controlling interests in the consolidated financial statements of the Partnership consisted of 39.37% general partner interest and 9.63% limited partner interest in OCI Wyoming owned by NRP. In connection with the conversion of OCI Wyoming from a Delaware limited partnership to a Delaware limited liability company, NRP's general partner interest and limited partnership interest were converted into a single-class of membership interests in OCI Wyoming, which currently consists of a 49.0% membership interest in OCI Wyoming.
	Use of Estimates
	The preparation of consolidated financial statements, in accordance with accounting principles generally accepted in the United States of America, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the dates of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Revenue Recognition
	We recognize revenue when the earnings process is complete, which is generally upon transfer of title. This transfer typically occurs upon shipment to the customer, which is normally free on board ("FOB") terms or upon receipt by the customer. In all cases, we apply the following criteria in recognizing revenue: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred; (3) the selling price is fixed, determinable or reasonably estimated sales price has been agreed with the customer; and (4) collectability is reasonably assured. Customer rebates are accounted for as sales deductions. We record amounts billed for shipping and handling fees as revenue. Costs incurred for shipping and handling are recorded as costs of sales and services.
	Freight Costs
	The Partnership includes freight costs billed to customers for shipments administered by the Partnership in gross sales. The related freight costs along with cost of products sold are deducted from gross sales to determine gross profit.
	Cash and Cash Equivalents
	The Partnership considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents consist primarily of money market deposit accounts.
	Accounts Receivable
	Accounts receivable are carried at the original invoice amount less an estimate for doubtful receivables. The allowance for doubtful accounts is based on specifically identified amounts that the Partnership believes to be uncollectible. An additional allowance is recorded based on certain percentages of aged receivables, which are determined based on management's assessment of the general financial conditions affecting the Partnership's customer base. If actual collection experience changes, revisions to the allowance may be required. Accounts receivable are written off when deemed uncollectible. Recoveries of accounts receivable previously written off are recorded when received. During the years ended 2014, 2013 and 2012, there were no significant accounts receivable bad debt expenses, write-offs or recoveries.
	Inventory
	Inventory is carried at the lower of cost or market determined on a first-in, first-out basis. Costs include raw materials, direct labor and manufacturing overhead. Market is based on current replacement cost for raw materials and stores inventory, and finished goods is based on net realizable value.

	•	Raw material inventory includes material and natural resources being used in the mining and refining process.

	•	Finished goods inventory is the finished product soda ash.

	•	Stores inventory includes materials and supplies currently available for future use.
	Property, Plant, and Equipment
	Property, plant, and equipment are stated at cost less accumulated depreciation. Depreciation is computed over the estimated useful lives of depreciable assets, principally using the straight-line method. The estimated useful lives applied to depreciable assets are as follows:


			Useful Lives
	Land and land improvements		10 years
	Depletable land		15-60 years
	Buildings and building improvements		10-30 years
	Internal-use computer software		3-5 years
	Machinery and equipment		5-20 years
	When property, plant, and equipment are sold or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in operations for the year.
	The Partnership's policy is to evaluate property, plant, and equipment for impairment whenever events or changes in circumstances indicate that its carrying amount may not be recoverable. An indicator of potential impairment would include situations when the estimated future undiscounted cash flows are less than the carrying value. The amount of any impairment then recognized would be calculated as the difference between estimated fair value and the carrying value of the asset.
	Derivative Instruments and Hedging Activities
	The Partnership may enter into derivative contracts from time to time to manage exposure to the risk of exchange rate changes on its foreign currency transactions, the risk of changes in natural gas prices, and the risk of the variability in interest rates on borrowings. Gains and losses on derivative contracts are reported as a component of the underlying transactions. The Partnership follows hedge accounting for its hedging activities. All derivative instruments are recorded on the balance sheet at their fair values. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and the resulting designation. The Partnership designates its derivatives based upon criteria established for hedge accounting under generally accepted accounting principles. For a derivative designated as a fair value hedge, the gain or loss is recognized in earnings in the period of change together with the offsetting gain or loss on the hedged item attributed to the risk being hedged. For a derivative designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially reported as a component of accumulated other comprehensive income (loss) and subsequently reclassified into earnings when the hedged exposure affects earnings. Any significant ineffective portion of the gain or loss is reported in earnings immediately. For derivatives not designated as hedges, the gain or loss is reported in earnings in the period of change.
	Income Tax
	We are organized as a pass-through entity for federal income tax purposes. As a result, our partners are responsible for federal income taxes based on their respective share of taxable income. Net income for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax basis and financial reporting basis of assets and liabilities and the taxable income allocation requirements under the partnership agreement.
	The Partnership is a limited partnership and generally is not subject to federal or certain state income taxes. The Predecessor was subject to income tax and was included in the consolidated income tax returns of OCI Enterprises. Income taxes were allocated to the Predecessor based on separate-company computations of income or loss. The income tax expense for the year ended December 31, 2012 are those of the Predecessor. For the year ended December 31, 2013, included in income tax expense is the expense of the Predecessor through September 17, 2013.
	Reclamation Costs
	The Partnership is obligated to return the land beneath its refinery and tailings ponds to its natural condition upon completion of operations and is required to return the land beneath its rail yard to its natural condition upon termination of the various lease agreements.
	The Partnership accounts for its land reclamation liability as an asset retirement obligation, which requires that obligations associated with the retirement of a tangible long-lived asset be recorded as a liability when those obligations are incurred, with the amount of the liability initially measured at fair value. Upon initially recognizing a liability for an asset retirement obligation, an entity must capitalize the cost by recognizing an increase in the carrying amount of the related long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the estimated useful life of the related asset. Upon settlement of the liability, an entity either settles the obligation for its recorded amount or incurs a gain or loss upon settlement.
	The estimated original liability calculated in 1996 for the refinery and tailing ponds was calculated based on the estimated useful life of the mine, which was 80 years, and on external and internal estimates as to the cost to restore the land in the future and state regulatory requirements. As a result of a revised mine reserve study, effective January 1, 2015, the mining reserve will be amortized over a remaining life of 68 years. During 2014, 2013 and 2012, the remaining life was 66, 67 and 69, respectively. The liability was discounted using credit-adjusted risk-free rates of 7% and is being accreted throughout the estimated life of the related assets to equal the total estimated costs with a corresponding entry being recorded to interest expense.
	During 2011, the Partnership constructed a rail yard to facilitate loading and switching of rail cars. The Partnership is required to restore the land on which the rail yard is constructed to its natural conditions. The estimated liability for restoring the rail yard to its natural condition is calculated based on the land lease life of 30 years and on external and internal estimates as to the cost to restore the land in the future. The liability is discounted using a credit-adjusted risk-free rate of 4.25% and is being accreted throughout the estimated life of the related assets to equal the total estimated costs with a corresponding entry being recorded to interest expense.
	Fair Value of Financial Instruments
	Fair value is determined using a valuation hierarchy, generally by reference to an active trading market, quoted market prices or model-derived valuations for the same or similar financial instruments. See Note 16, "Fair Value Measurements," for more information.
	Equity-Based Compensation
	We recognize compensation expense related to equity-based awards, with service conditions, granted to employees based on the estimated fair value of the awards on the date of grant, net of estimated forfeitures. The grant date fair value of the equity-based awards is generally recognized on a straight-line basis over the requisite service period, which is generally the vesting period of the respective awards. Equity-based awards with market conditions are fair valued using a Monte Carlo Simulation model. See Note 11, "Equity-Based Compensation - TR Performance Unit Awards," for additional information.
	Subsequent Events
	We have evaluated subsequent events through the filing of this Annual Report on Form 10-K.
	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) that requires companies to recognize revenue when a customer obtains control rather than when companies have transferred substantially all risks and rewards of a good or service. This update is effective for annual reporting periods beginning on or after December 15, 2016 and interim periods therein and requires expanded disclosures. We are currently assessing the impact the adoption of ASU 2014-09 will have on our consolidated financial statements.
	In June 2014, the FASB issued ASU No. 2014-12, Compensation – Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The new guidance requires that share-based compensation that require a specific performance target to be achieved in order for employees to become eligible to vest in the awards and that could be achieved after an employee completes the requisite service period be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation costs should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. This new guidance is effective for fiscal years and interim periods within those years beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in this Update either (a) prospectively to all awards granted or modified after the effective date or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of ASU 2014-12 is not expected to have a material impact on our financial position or results of operations.

NET_INCOME_PER_UNIT_AND_CASH_D

NET INCOME PER UNIT AND CASH DISTRIBUTION	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
NET INCOME PER UNIT AND CASH DISTRIBUTION	NET INCOME PER UNIT AND CASH DISTRIBUTION
	Net income per unit applicable to limited partners (including subordinated unitholders) is computed by dividing limited partners’ interest in net income attributable to OCIR after deducting the general partner's interest and any incentive distributions, by the weighted average number of outstanding common and subordinated units. 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. Earnings in excess of distributions are allocated to the general partner and limited partners based on their respective ownership interests. 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 ("IDRs") 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 our dilutive and anti-dilutive units outstanding were immaterial for the period.
	Allocation of Net Income
	The calculation of net income per unit is as follows:


			Years Ended
			December 31,
	($ and unit data in millions, except per unit data)		2014			2013

	Net income attributable to OCI Resources LP (1)		$	44.5		$	13

	Less: General partner's interest in net income		0.8			0.2

	Limited partners' interest in net income		$	43.7		$	12.8


	Weighted average limited partner units outstanding:
	Common - Public and OCI Holdings (basic and diluted)		9.8			9.8
	Subordinated - OCI Holdings (basic and diluted)		9.8			9.8

	Net income per limited partner unit (1):
	Common - Public and OCI Holdings (basic and diluted)		$	2.23		$	0.65

	Subordinated - OCI Holdings (basic and diluted)		$	2.23		$	0.65




	(1) Net income attributable to OCI Resources LP and net income per limited partner unit, for year ended December 31, 2013, is subsequent to initial public offering.

	The calculation of limited partners' interest in net income is as follows:


		Years Ended
		December 31,
	($ in millions, except per unit data)	2014			2013
	Net income attributable to common unitholders (1):
	Distributions (2)	$	20.2		$	5.6

	Undistributed earnings	1.7			0.8

	Common unitholders' interest in net income (1)	$	21.9		$	6.4


	Net income attributable to subordinated unitholders (1):
	Distributions (2)	$	20.1		$	5.6

	Undistributed earnings	1.7			0.8

	Subordinated unitholders' interest in net income (1)	$	21.8		$	6.4


	(1) Net income and interest attributable to common and subordinated unitholders, for year ended December 31, 2013, is subsequent to initial public offering.
	(2) Distributions declared per unit for the period
	Quarterly Distribution
	On January 16, 2015, the Partnership declared its fourth quarter 2014 quarterly distribution. The quarterly cash distribution of $0.5315 per unit was paid on February 13, 2015 to unitholders of record on January 30, 2015.
	Our general partner has considerable discretion in determining the amount of available cash, the amount of distributions and the decision to make any distribution. Although our partnership agreement requires that we distribute all of our available cash quarterly, there is no guarantee that we will make quarterly cash distributions to our unitholders at our current quarterly distribution level, at the minimum quarterly distribution level or at any other rate, and we have no legal obligation to do so. However, our partnership agreement does contain provisions intended to motivate our general partner to make steady, increasing and sustainable distributions over time.
	Distributions from Operating Surplus During the Subordination Period
	If we make a distribution from operating surplus for any quarter during the subordination period (beginning on September 18, 2013 and expiring on the first business day after the distribution to unitholders in respect of any quarter, beginning with the quarter ending September 30, 2016), our partnership agreement requires that we make the distribution in the following manner:

	•	first, 98.0% to the common unitholders, pro rata, and 2.0% to our general partner, until we distribute for each common unit an amount equal to the minimum quarterly distribution for that quarter;

•	second, 98.0% to the common unitholders, pro rata, and 2.0% to our general partner, until we distribute for each outstanding common unit an amount equal to any arrearages in the payment of the minimum quarterly distribution on the common units with respect to any prior quarters;

•	third, 98.0% to the subordinated unitholders, pro rata, and 2.0% to our general partner, until we distribute for each subordinated unit an amount equal to the minimum quarterly distribution for that quarter; and

•	thereafter, in the manner described in - "General Partner Interest and Incentive Distribution Rights" below.
General Partner Interest and Incentive Distribution Rights
Our partnership agreement provides that our general partner initially will be entitled to 2.0% of all distributions that we make prior to our liquidation. Our general partner has the right, but not the obligation, to contribute up to a proportionate amount of capital to us in order to maintain its 2.0% general partner interest if we issue additional units. Our general partner's approximate 2.0% interest, and the percentage of our cash distributions to which our general partner is entitled from such approximate 2.0% interest, will be proportionately reduced if we issue additional units in the future (other than (1) the issuance of common units upon conversion of outstanding subordinated units or (2) the issuance of common units upon a reset of the IDRs), and our general partner does not contribute a proportionate amount of capital to us in order to maintain its approximate 2.0% general partner interest. Our partnership agreement does not require that our general partner fund its capital contribution with cash. It may, instead, fund its capital contribution by contributing to us common units or other property.
IDRs represent the right to receive increasing percentages (13.0%, 23.0% and 48.0%) of quarterly distributions from operating surplus after we have achieved the minimum quarterly distribution and the target distribution levels. Our general partner currently holds the IDRs, but may transfer these rights separately from its general partner interest, subject to certain restrictions in our partnership agreement.
Percentage Allocations of Distributions from Operating Surplus
The following table illustrates the percentage allocations of distributions from operating surplus between the unitholders and our general partner based on the specified target distribution levels. The amounts set forth under the column heading "Marginal Percentage Interest in Distributions" are the percentage interests of our general partner and the unitholders in any distributions from operating surplus we distribute up to and including the corresponding amount in the column "Total Quarterly Distribution per Unit Target Amount." The percentage interests shown for our unitholders and our general partner for the minimum quarterly distribution also apply to quarterly distribution amounts that are less than the minimum quarterly distribution. The percentage interests set forth below for our general partner (1) include a 2.0% general partner interest, (2) assume that our general partner has contributed any additional capital necessary to maintain its 2.0% general partner interest, (3) assume that our general partner has not transferred its incentive distribution rights and (4) assume there are no arrearages on common units.


			Marginal Percentage
			Interest in
			Distributions
	Total Quarterly		Unitholders		General Partner
	Distribution per Unit
	Target Amount
Minimum Quarterly Distribution	$0.50		98	%	2	%
First Target Distribution	above $0.5000 up to $0.5750		98	%	2	%
Second Target Distribution	above $0.5750 up to $0.6250		85	%	15	%
Third Target Distribution	above $0.6250 up to $0.7500		75	%	25	%
Thereafter	above $0.7500		50	%	50	%

ACCOUNTS_RECEIVABLE

ACCOUNTS RECEIVABLE	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
ACCOUNTS RECEIVABLE	ACCOUNTS RECEIVABLE, NET
	Accounts receivable, net as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014			2013
	Trade receivables	$	24.7		$	23.9

	Other receivables	10.9			10.5

		35.6			34.4

	Allowance for doubtful accounts	(0.1		)	—

	Total	$	35.5		$	34.4

INVENTORY

INVENTORY	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
INVENTORY	INVENTORY
	Inventory as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Raw materials	$	6.4	$	5.7

	Finished goods	10.4		10.5

	Stores inventory	26.4		25.5

	Total	$	43.2	$	41.7

PROPERTY_PLANT_AND_EQUIPMENT_N

PROPERTY, PLANT AND EQUIPMENT (Notes)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT, AND EQUIPMENT, NET
	Property, plant, and equipment, net as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014			2013
	Land and land improvements	$	0.3		$	0.3

	Depletable land	3			2

	Buildings and building improvements	129.5			128.9

	Internal-use computer software	4.5			4.1

	Machinery and equipment	595.5			594.6

	Mining reserves	65.3			65.2

	Total	798.1			795.1

	Less accumulated depreciation, depletion and amortization	(586.2		)	(580.0		)
	Total net book value	211.9			215.1

	Construction in progress	33.1			22.9

	Total property, plant, and equipment, net	$	245		$	238

	Depreciation, depletion and amortization expense on property, plant, and equipment was $22.4 million, $23.9 million and $23.7 million for the years ended December 31, 2014, 2013 and 2012, respectively.

ACCRUED_EXPENSES

ACCRUED EXPENSES	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
ACCRUED EXPENSES	ACCRUED EXPENSES
	Accrued expenses as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Accrued freight costs	$	1.4	$	0.5

	Accrued energy costs	5.7		6.1

	Accrued royalty costs	4.4		4

	Accrued employee compensation	6.8		5.2

	Accrued other taxes	4.7		4.3

	Accrued derivatives	0.7		1.1

	Other accruals	5.8		5.2

	Total	$	29.5	$	26.4

DEBT

DEBT	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
DEBT	DEBT

	Long-term debt as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Variable Rate Demand Revenue Bonds, principal due October 1, 2018, interest payable monthly, bearing monthly interest rate of 0.14% (2014) and 0.16% (2013)	$	11.4	$	11.4

	Variable Rate Demand Revenue Bonds, principal due August 1, 2017, interest payable monthly, bearing monthly interest rate of 0.14% (2014) and 0.16% (2013)	8.6		8.6

	OCI Wyoming Credit Facility, unsecured principal expiring on July 18, 2018, interest payable quarterly, bearing quarterly variable interest at 1.9781% (2014) and 1.996% (2013)	125		135

	Total debt	145		$	155

	Current portion of long-term debt	—		—

	Total long-term debt	$	145	$	155


	Aggregate maturities required on long-term debt at December 31, 2014 are as follows:


	2017	8.6

	2018	$	136.4

	Total	$	145

	Demand Revenue Bonds
	The above revenue bonds require OCI Wyoming to maintain standby letters of credit totaling $20.3 million at December 31, 2014 and December 31, 2013. These letters of credit require compliance with certain covenants, including minimum net worth, maximum debt to net worth, and interest coverage ratios. As of December 31, 2014 and December 31, 2013, OCI Wyoming was in compliance with these debt covenants.
	OCI Wyoming Credit Facility
	On July 18, 2013, OCI Wyoming entered into a $190.0 million senior unsecured revolving credit facility, as amended on October 30, 2014 (as amended, the "OCI Wyoming Credit Facility"), with a syndicate of lenders, which will mature on the fifth anniversary of the closing date of such credit facility. The OCI Wyoming Credit Facility provides for revolving loans to fund working capital requirements, capital expenditures, to consummate permitted acquisitions and for all other lawful partnership purposes. The OCI Wyoming Credit Facility has an accordion feature that allows OCI Wyoming to increase the available revolving borrowings under the facility by up to an additional $75.0 million, subject to OCI Wyoming receiving increased commitments from existing lenders or new commitments from new lenders and the satisfaction of certain other conditions. In addition, the OCI Wyoming Credit Facility includes a sublimit up to $20.0 million for same-day swing line advances and a sublimit up to $40.0 million for letters of credit. OCI Wyoming's obligations under the OCI Wyoming Credit Facility are unsecured.
	The OCI Wyoming Credit Facility contains various covenants and restrictive provisions that limit (subject to certain exceptions) OCI Wyoming's ability to:

	•	make distributions on or redeem or repurchase units;

	•	incur or guarantee additional debt;

	•	make certain investments and acquisitions;

	•	incur certain liens or permit them to exist;

	•	enter into certain types of transactions with affiliates of OCI Wyoming;

	•	merge or consolidate with another company; and

	•	transfer, sell or otherwise dispose of assets.
	The OCI Wyoming Credit Facility also requires quarterly maintenance of a consolidated leverage ratio (as defined in the OCI Wyoming Credit Facility) of not more than 3.00 to 1.00 and a consolidated fixed charge coverage ratio (as defined in the OCI Wyoming Credit Facility) of not less than 1.10 to 1.00 for the 2014 and 2015 fiscal years, respectively, and not less than 1.15 to 1.00 thereafter. The OCI Wyoming Credit Facility also requires that consolidated capital expenditures, as defined in the OCI Wyoming Credit Facility, not exceed $50 million in any fiscal year.
	In addition, the OCI Wyoming Credit Facility contains events of default customary for transactions of this nature, including (i) failure to make payments required under the OCI Wyoming Credit Facility, (ii) events of default resulting from failure to comply with covenants and financial ratios in the OCI Wyoming Credit Facility, (iii) the occurrence of a change of control, (iv) the institution of insolvency or similar proceedings against OCI Wyoming and (v) the occurrence of a default under any other material indebtedness OCI Wyoming may have. Upon the occurrence and during the continuation of an event of default, subject to the terms and conditions of the OCI Wyoming Credit Facility, the lenders may terminate all outstanding commitments under the OCI Wyoming Credit Facility and may declare any outstanding principal of the OCI Wyoming Credit Facility debt, together with accrued and unpaid interest, to be immediately due and payable.
	Under the OCI Wyoming Credit Facility, a change of control is triggered if OCI Chemical and its wholly-owned subsidiaries, directly or indirectly, cease to own all of the equity interests, or cease to have the ability to elect a majority of the board of directors (or similar governing body) of OCI GP (or any entity that performs the functions of our general partner). In addition, a change of control would be triggered if we cease to own at least 50.1% of the economic interests in OCI Wyoming or cease to have the ability to elect a majority of the members of OCI Wyoming's board of managers.
	OCI Wyoming was in compliance with all covenants and restrictions under its long-term debt agreements as of December 31, 2014.
	Loans under the OCI Wyoming Credit Facility bear interest at OCI Wyoming's option at either:

	•	a Base Rate, which equals the highest of (i) the federal funds rate in effect on such day plus 0.50%, (ii) the administrative agent's prime rate in effect on such day and (iii) one-month LIBOR plus 1.0%, in each case, plus an applicable margin; or

	•	a LIBOR Rate plus an applicable margin.
	The unused portion of the OCI Wyoming Credit Facility is subject to an unused line fee ranging from 0.275% to 0.350% per annum based on OCI Wyoming's then current consolidated leverage ratio.
	Revolving Credit Facility
	On July 18, 2013, OCIR entered into a $10.0 million senior secured revolving credit facility, as amended on October 30, 2014 (as amended, the "Revolving Credit Facility"), with a syndicate of lenders, which will mature on the fifth anniversary of the closing date of such credit facility. The Revolving Credit Facility provides for revolving loans to be available to fund distributions on OCIR's units and working capital requirements and capital expenditures, to consummate permitted acquisitions and for all other lawful partnership purposes. At December 31, 2014 and 2013, OCIR had no outstanding borrowings under the Revolving Credit Facility. The Revolving Credit Facility includes a sublimit up to $5.0 million for same-day swing line advances and a sublimit up to $5.0 million for letters of credit. OCIR's obligations under the Revolving Credit Facility are guaranteed by each of OCIR's material domestic subsidiaries other than OCI Wyoming, and to the extent no material adverse tax consequences would result, foreign wholly owned subsidiaries. In addition, OCIR's obligations under the Revolving Credit Facility are secured by a pledge of substantially all of OCIR's assets (subject to certain exceptions), including the membership interests held in OCI Wyoming by us.

	The Revolving Credit Facility contains various covenants and restrictive provisions that limit (subject to certain exceptions) our ability to (and the ability of our subsidiaries, including without limitation, OCI Wyoming to):

	• make distributions on or redeem or repurchase units;
	• incur or guarantee additional debt;
• make certain investments and acquisitions;
• incur certain liens or permit them to exist;
• enter into certain types of transactions with affiliates;
• merge or consolidate with another company; and
• transfer, sell or otherwise dispose of assets.
The Revolving Credit Facility also requires quarterly maintenance of a consolidated fixed charge coverage ratio (as defined in the Revolving Credit Facility) of not less than 1.05 to 1.00 for the 2014 fiscal year and the 2015 fiscal year, and not less than 1.10 to 1.00 thereafter. The Revolving Credit Facility also requires that consolidated capital expenditures, as defined in the Revolving Credit Facility, not exceed $50 million in any fiscal year.

In addition, the Revolving Credit Facility contains events of default customary for transactions of this nature, including (i) failure to make payments required under the Revolving Credit Facility, (ii) events of default resulting from failure to comply with covenants and financial ratios, (iii) the occurrence of a change of control, (iv) the institution of insolvency or similar proceedings against OCIR or OCIR's material subsidiaries and (v) the occurrence of a default under any other material indebtedness OCIR (or any of OCIR's subsidiaries) may have, including the OCI Wyoming Credit Facility. Upon the occurrence and during the continuation of an event of default, subject to the terms and conditions of the Revolving Credit Facility, the lenders may terminate all outstanding commitments under the Revolving Credit Facility and may declare any outstanding principal of the Revolving Credit Facility debt, together with accrued and unpaid interest, to be immediately due and payable.

Under the Revolving Credit Facility, a change of control is triggered if OCI Chemical and its wholly-owned subsidiaries, directly or indirectly, cease to own all of the equity interests, or cease to have the ability to elect a majority of the board of directors (or similar governing body) of, OCI Holdings or OCI GP (or any entity that performs the functions of OCIR's general partner). In addition, a change of control would be triggered if OCIR ceases to own at least 50.1% of the economic interests in OCI Wyoming or ceases to have the ability to elect a majority of the members of OCI Wyoming's board of managers.
The Partnership was in compliance with all covenants and restrictions under its long-term debt agreements as of December 31, 2014.
Loans under the Revolving Credit Facility bear interest at our option at either:

•	a Base Rate, which equals the highest of (i) the federal funds rate in effect on such day plus 0.50%, (ii) the administrative agent's prime rate in effect on such day and (iii) one-month LIBOR plus 1.0%, in each case, plus an applicable margin; or

•	a LIBOR Rate plus an applicable margin.
The unused portion of the Revolving Credit Facility is subject to an unused line fee ranging from 0.275% to 0.350% based on our then current consolidated leverage ratio.

OTHER_NONCURRENT_LIABILITIES

OTHER NON-CURRENT LIABILITIES	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
RECLAMATION RESERVE	OTHER NON-CURRENT LIABILITIES

	Other non-current liabilities as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Reclamation reserve balance at beginning of year	$	3.8	$	3.6

	Accretion expense	0.4		0.2

	Reclamation reserve balance at end of year	$	4.2	$	3.8

EMPLOYEE_COMPENSATION

EMPLOYEE COMPENSATION	12 Months Ended
EMPLOYEE COMPENSATION	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
EMPLOYEE COMPENSATION	EMPLOYEE COMPENSATION
	The Partnership participates in various benefit plans offered and administered by OCI Enterprises and is allocated its portions of the annual costs related thereto. The specific plans are as follows:
	Retirement Plans - Benefits provided under the OCI Enterprises' Pension Plan for Salaried Employees and OCI Enterprises' Pension Plan for Hourly Employees are based upon years of service and average compensation for the highest 60 consecutive months of the employee's last 120 months of service, as defined. Each plan covers substantially all full-time employees hired before May 1, 2001. OCI Enterprises’ funding policy is to contribute an amount within the range of the minimum required and the maximum tax-deductible contribution. The Partnership's allocated portion of OCI Enterprises’ net periodic pension cost was $3.1 million, $8.4 million and $9.0 million for the years ended December 31, 2014, 2013 and 2012, respectively. The decrease in pension costs was driven by favorable effects of higher actuarial discount rates and market returns. These pension expenses will revert back to 2013 levels during 2015.
	Savings Plan - The OCI Enterprises' 401(k) Retirement Plan covers all eligible hourly and salaried employees. Eligibility is limited to all domestic residents and any foreign expatriates who are in the United States indefinitely. The plan permits employees to contribute specified percentages of their compensation, while the Partnership makes contributions based upon specified percentages of employee contributions. The Plan was amended such that participants hired on or subsequent to May 1, 2001, will receive an additional contribution from the Partnership based on a percentage of the participant’s base pay. Contributions made by OCI Enterprises for the years ended December 31, 2014, 2013 and 2012 were $2.4 million, $2.8 million and $2.4 million, respectively.
	Postretirement Benefits - Most of the Partnership's employees are eligible for postretirement benefits other than pensions if they reach retirement age while still employed.
	OCI Enterprises accounts for postretirement benefits on an accrual basis over an employee’s period of service. The postretirement plan, excluding pensions, are not funded, and OCI Enterprises has the right to modify or terminate the plan. OCI Enterprises' post-retirement benefits had a benefits obligation of $22.8 million and $21.0 million at December 31, 2014 and 2013, respectively. Effective January 1, 2013, the postretirement benefits for non-grandfathered retirees were amended to replace the medical coverage for post-65-year-old members with a fixed dollar contribution amount. As a result of the amendment, the accumulated and projected benefit obligation for postretirement benefits decreased by $8.7 million and resulted in a prior service credit of $7.7 million which will be recognized as a reduction of net periodic postretirement benefit costs in future years. The Partnership’s allocated portion of postretirement benefit costs were income of $0.3 million and $0.1 million for the years ended December 31, 2014 and 2013, respectively; and expense of $2.2 million for the year ended December 31, 2012.

EQUITY_BASED_COMPENSATION_Note

EQUITY - BASED COMPENSATION (Notes)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
EQUITY - BASED COMPENSATION	EQUITY - BASED COMPENSATION
	In July 2013, our general partner established the OCI Resource Partners LLC 2013 Long-Term Incentive Plan (the "Plan" or "LTIP"). The Plan is intended to provide incentives that will attract and retain valued employees, officers, consultants and non-employee directors by offering them a greater stake in our success and a closer identity with us, and to encourage ownership of our common units by such individuals. The Plan provides for awards in the form of common units, phantom units, distribution equivalent rights ("DERs"), cash awards and other unit-based awards.
	All employees, officers, consultants and non-employee directors of us and our parents and subsidiaries are eligible to be selected to participate in the Plan. As of December 31, 2014, subject to further adjustment as provided in the Plan, a total of 928,099 common units were available for awards under the Plan. Any common units tendered by a participant in payment of the tax liability with respect to an award, including common units withheld from any such award, will not be available for future awards under the Plan. Common units awarded under the Plan may be reserved or made available from our authorized and unissued common units or from common units reacquired (through open market transactions or otherwise). Any common units issued under the Plan through the assumption or substitution of outstanding grants from an acquired company will not reduce the number of common units available for awards under the Plan. If any common units subject to an award under the Plan are forfeited, any common units counted against the number of common units available for issuance pursuant to the Plan with respect to such award will again be available for awards under the Plan.
	Non-employee Director Awards
	As of December 31, 2014, a total of 7,941 common units were granted to non-employee directors and were fully vested. The total fair value of these awards was approximately $0.2 million at the date of grant during the year ended December 31, 2014.
	Restricted Unit Awards
	During the year ended December 31, 2014, we granted restricted unit awards in the form of common units to certain of our executive officers which vest over a specified period of time, usually between one to three years, with vesting based on continued employment as of each applicable vesting date. Award recipients are entitled to distributions subject to the same restrictions as the underlying common unit. The awards are classified as equity awards, and are accounted for at fair value at grant date.
	The following table presents a summary of activity for the year ended December 31, 2014:


		Restricted Stock Units
	(Units in whole numbers)	Number of Units		Grant-Date Average Fair Value per Unit (1)
	Nonvested at December 31, 2013	—		$	—

	Granted (2)	19,960		25.01

	Vested	(4,101	)	25.54

	Nonvested at December 31, 2014	15,859		$	25.23




	(1) Determined by dividing the aggregate grate date fair value of awards by the number of awards issued.
	(2) The aggregate grant date fair value of time-based awards issued during 2014 was $0.5 million based on a grant date market price of our common units ranging from $24.16 to $25.54 per unit. No estimated forfeiture rate was applied to the awards as of December 31, 2014, as all awards granted are expected to vest.
	TR Performance Unit Awards

	During the year ended December 31, 2014, we granted time restricted unit performance awards ("TR Performance Unit Awards") to certain of our executive officers. The TR Performance Unit awards represent the right to receive a number of common units at a future date based on the achievement of market-based performance requirements in accordance with the TR Unit Performance Award agreement, and also include Distribution Equivalent Rights (“DERs”). DERs are the right to receive an amount equal to the accumulated cash distributions made during the period with respect to each common unit issued upon vesting. The TR Performance Unit Awards vest at the end of the performance period, usually between two to three years from the date of the grant. The DERs are forfeitable and vest with the TR Performance Unit Awards. Performance is measured on the achievement of a specified level of total return, or TR, relative to the TR of a peer group comprised of other limited partnerships. The potential payout ranges from 0-200% of the grant target quantity and is adjusted based on our TR performance relative to the peer group
	We utilized a Monte Carlo Simulation model to estimate the grant date fair value of TR Performance Unit Awards, with market conditions, granted to employees, which requires the input of highly subjective assumptions, including expected volatility and expected distribution yield. Historical and implied volatilities were used in estimating the fair value of these awards.
	The following table presents a summary of activity for the year ended December 31, 2014:


		TR Unit Performance Awards
	(Units in whole numbers)	Number of Units		Grant-Date Average Fair Value per Unit (1)
	Nonvested at December 31, 2013	—		$	—

	Granted	7,658		35.72

	Nonvested at December 31, 2014	7,658		$	35.72




	(1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.
	Unrecognized Compensation Expense
	A summary of the Partnership's unrecognized compensation expense for its non-vested restricted time and performance based units, and the weighted-average periods over which the compensation expense is expected to be recognized are as following:


		Year Ended December 31, 2014
		Unrecognized Compensation Expense			Weighted Average to be Recognized
		(In millions)			(In years)
	Time-based units	$	0.3		1.85

	Performance-based units	0.2			2

	Total	$	0.5

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES
	The Partnership is a limited partnership and generally is not subject to federal or certain state income taxes. As a result, the Partnership has not recognized income taxes for the year ended December 31, 2014.
	The Predecessor was subject to income tax and was included in the consolidated income tax returns of OCI Enterprises. Income taxes were allocated to the Predecessor based on separate-company computations of income or loss. The income tax expense for the year ended December 31, 2012 are those of the Predecessor. For the year ended December 31, 2013, included in income tax expense is the expense of the Predecessor through September 17, 2013.
	The provision for income taxes for the years ended December 31, 2013 and 2012 includes the following:


		2013			2012
					(Predecessor)
	Current	$	6.8		$	16.6

	Deferred	0.3			(0.2		)

	Total provision for income tax	$	7.1		$	16.4


	The effective tax rate (excluding net income attributable to non-controlling interest) for the years ended December 31, 2013 and 2012 includes the following:


		2013						2012
								(Predecessor)
		Amount			Rate			Amount			Rate
					Effect						Effect
	Income tax provision at federal statutory rate	$	7.1		35	%		$	18.3		35	%

	State and local income taxes net of federal tax benefit	0.5			2.36	%		0.1			0.24	%

	Permanent domestic production activity deduction	(0.4		)	(2.06	)%		(2.1		)	(4.01	)%
	Other	(0.1		)	(0.27	)%		0.1			0.23	%

	Total provision for income tax	$	7.1		35.03	%		$	16.4		31.46	%

	The effective tax rate excludes income taxes on income attributable to non-controlling interest shareholders because the results of OCI Wyoming LLC's operations are taxed to its owners as a partnership for U.S. income tax purposes.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES
	Lease Commitments
	OCI Chemical, on behalf of the Partnership, typically enters into operating lease contracts with various lessors for railcars to transport product to customer locations and warehouses. Rail car leases under these contractual commitments range for periods from 1 to 10 years.
	The Partnership leases mineral rights from the U.S. Bureau of Land Management, the state of Wyoming, Rock Springs Royalty Corp, a wholly owned subsidiary of Anadarko, and other private parties. All of these leases provide for royalties based upon production volume. The remaining leases provide for minimum lease payments as detailed in the table below. The Partnership has a perpetual right of first refusal with respect to these leases and intends to continue renewing the leases as has been its practice.
	The Partnership entered into a 10 year rail yard switching and maintenance agreement with a third party, Watco Companies, LLC ("Watco"), on December 1, 2011. Under the agreement, Watco provides rail-switching services at the Partnership’s rail yard. The Partnership’s rail yard is constructed on land leased by Watco from Rock Springs Grazing Association and on land by which Watco holds an easement from Anadarko Land Corp; the Rock Springs Grazing Association land lease is renewable every 5 years for a total period of 30 years, while the Anadarko Land Corp. easement lease is perpetual. The Partnership has an option agreement with Watco to assign these leases to the Partnership at any time during the land lease term. An annual rental of $15 thousand is paid under the easement and an annual rental of $60 thousand is paid under the lease.
	The Partnership entered into a 10 year track lease agreement with Union Pacific for certain rail tracks used in connection with the rail yard.
	OCI Chemical, on behalf of the Partnership, typically enters into operating lease contracts with various lessors for railcars to transport product to customer locations and warehouses. Rail car leases under these contractual commitments range for periods from 1 to 10 years. OCI Chemical's obligation related to these rail car leases are $9.7 million in 2015, $7.1 million in 2016, $5.7 million in 2017, $4.4 million in 2018, $3.6 million in 2019 and $4.2 million in 2020 and thereafter.
	As of December 31, 2014, the total minimum contractual rental commitments under the Partnership's various operating leases, including renewal periods, are as follows:


	($ in millions)	Leased Land		Track Lease		Total Minimum Lease Payments

	2015	$	0.1	$	—	$	0.1

	2016	0.1		—		0.1

	2017	0.1		—		0.1

	2018	0.1		—		0.1

	2019	0.1		—		0.1

	Thereafter	1.5		0.2		1.7

	Total	$	2	$	0.2	$	2.2

	Purchase Commitments
	We have natural gas supply contracts to mitigate volatility in the gas price. As of December 31, 2014, these contracts total $66.1 million for the purchase of a portion of our gas requirement over approximately the next five years. The supply purchase agreements have specific commitments of $22.4 million in 2015, $16.1 million in 2016, $13.3 million in 2017, $8.0 million in 2018 and $6.3 million in 2019. We have a separate contract for transportation of gas with average annual cost of approximately $3.6 million per year and the contract runs through 2021.
	Legal Proceedings
	From time to time, the Partnership has various litigation, claims, and assessments that arise in the normal course of business. Management does not believe, based upon its evaluation and discussion with counsel, that the ultimate outcome of any current matters, individually or in the aggregate, would have a material effect on the Partnership's financial position, results of operations, or cash flows.
	Off-Balance Sheet Arrangements
	We have a self-bond agreement with the Wyoming Department of Environmental Quality under which we commit to pay directly for reclamation costs. As of December 31, 2014, the amount of the bond was $33.9 million (December 31, 2013: $27.1 million), which is the amount we would need to pay the State of Wyoming for reclamation costs if we cease mining operations currently. The amount of this self-bond is subject to change upon periodic re-evaluation by the Land Quality Division.

AGREEMENTS_AND_TRANSACTIONS_WI

AGREEMENTS AND TRANSACTIONS WITH AFFILIATES	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
AGREEMENTS AND TRANSACTIONS WITH AFFILIATES	AGREEMENTS AND TRANSACTIONS WITH AFFILIATES
	OCI Chemical is the exclusive sales agent for the Partnership and through its membership in ANSAC, OCI Chemical is responsible for promoting and increasing the use and sale of soda ash and other refined or processed sodium products produced. All actual sales and marketing costs incurred by OCI Chemical are charged directly to the Partnership. Selling, general and administrative expenses also include amounts charged to the Partnership by OCI Enterprises and OCI Chemical principally consisting of salaries, benefits, office supplies, professional fees, travel, rent and other costs of certain assets used by the Partnership. These transactions do not necessarily represent arm's length transactions and may not represent all costs if the Partnership operated on a stand alone basis.
	The total costs charged to the Partnership by OCI Enterprises and OCI Chemical, including ANSAC related charge for the years ended December 31, 2014, 2013 and 2012 are as follows:


		Years Ended December 31,
	($ in millions)	2014			2013			2012
	OCI Enterprises	$	10.7		$	5.5		$	4

	OCI Chemical	3.4			4.4			5.2

	ANSAC	2.9			2.6			1.9

	Total selling, general and administrative expenses - Affiliates	$	17		$	12.5		$	11.1




	(1) ANSAC allocates its expenses to ANSAC’s members using a pro rata calculation based on sales.

	Cost of products sold includes logistics services charged by ANSAC. For the years ended December 31, 2014, 2013 and 2012 these costs were $9.2 million, $6.7 million and $5.8 million, respectively.
	Net sales to affiliates for the years ended December 31, 2014, 2013 and 2012 are as follows:


			Years Ended December 31,
	($ in millions)		2014			2013			2012
	ANSAC		$	230.8		$	200.4		$	229.5

	OCI Alabama LLC		5.9			7.3			7.4

	OCI Company Limited		—			3.9			—

	Total		$	236.7		$	211.6		$	236.9

	As of December 31, 2014 and December 31, 2013, the Partnership had receivables and payables representing arm's length transactions with affiliated entities, as follows:


		As of December 31,
	($ in millions)	2014			2013			2014			2013
		Receivables from affiliates						Payables to affiliates
	OCI Enterprises	$	1.7		$	0.1		$	4.5		$	2.2

	OCI Chemical	8.7			10.5			1.4			—

	OCI Chemical Europe NV	9.2			7.8			—			—

	OCI Company Limited	—			1.9			—			—

	Other	—			0.1			1.2			0.1

	Total	$	19.6		$	20.4		$	7.1		$	2.3

MAJOR_CUSTOMERS_AND_SEGMENT_RE

MAJOR CUSTOMERS AND SEGMENT REPORTING	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
MAJOR CUSTOMERS AND SEGMENT REPORTING	MAJOR CUSTOMERS AND SEGMENT REPORTING
	Our operations are similar in nature of products we provide and type of customers we serve. As the Partnership earns substantially all of its revenues through the sale of soda ash mined at a single location, we have concluded that we have one operating segment for reporting purposes. The net sales by geographic area for the years ended December 31, 2014, 2013 and 2012 are as follows:


		Years Ended December 31,
	($ in millions)	2014		2013		2012
	Domestic	$	194.8	$	195.1	$	199.4

	International
	ANSAC	230.8		200.4		229.5

	Other	39.4		46.6		33.7

	Total international	270.2		247		263.2

	Total net sales	$	465	$	442.1	$	462.6

	The Partnership's largest customer by sales is ANSAC. For the year ended December 31, 2014, there were no other customers who individually accounted for ten percent or more of total revenues.

FAIR_VALUE_MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	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.
	A three-level 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:


	Ÿ	Level 1-inputs to the valuation methodology are quoted prices (unadjusted) for an identical asset or liability in an active market.

	Ÿ	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.

	Ÿ	Level 3-inputs to the valuation methodology are unobservable and significant to the fair value measurement of the asset or liability.

	Financial instruments consist primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and long-term debt. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value because of the nature of such instruments. Our interest rate swaps and foreign exchange contracts are fair valued with Level 2 inputs based on quoted market values for similar but not identical financial instruments.
	Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
	We have entered into interest rate swaps designed to hedge our exposure to possible increases in interest rates. These contracts are for periods consistent with the exposure being hedged and generally will mature on July 18, 2018, the maturity date of the long-term debt under our Wyoming Credit Facility. These contracts had an aggregate notional value $76.0 million and $0.7 million fair value liability as of December 31, 2014 (December 31, 2013: notional value of $101.5 million; fair value liability of $0.5 million)
	We enter into foreign exchange forward contracts to hedge certain firm commitments denominated in currencies other than the U.S. dollar. However, the Partnership does not apply hedge accounting for these contracts. These contracts are for periods consistent with the exposure being hedged and generally have maturities of one year or less. The fair value of forward contracts, which are predominantly used to purchase U.S. dollars and sell Euros, totaled an asset of $0.6 million and a liability of $0.5 million at December 31, 2014 and 2013, respectively. These currency hedges have a notional value of $6.9 million and $26.4 million at December 31, 2014 and 2013, respectively.
	Financial Assets and Liabilities not Measured at Fair Value
	The fair value of our long-term debt is based on present rates for indebtedness with similar amounts, durations and credit risks. See Note 8 "Debt" for additional information on our debt arrangements.

SUBSEQUENT_EVENTS

SUBSEQUENT EVENTS	12 Months Ended
SUBSEQUENT EVENTS	Dec. 31, 2014
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTS
	Distribution Declaration

	On January 15, 2015, the members of the Board of Managers of OCI Wyoming LLC, approved and paid a cash distribution to the members in the aggregate amount of $22.0 million. The distribution was paid on January 16, 2015.

	On January 16, 2015, the Partnership declared its fourth quarter 2014 quarterly distribution. The quarterly cash distribution of $0.5315 per unit was paid on February 13, 2015 to unitholders of record on January 30, 2015.

	In February 2015, the Company entered into a natural gas forward contract with a notional value of approximately $17.6 million and maturity dates ranging from 2015 to 2020, to mitigate volatility in the gas prices. The maturity of the notional value is $0.9 million in 2015, $2.9 million in 2016, $3.2 million in 2017, $3.4 million in 2018, $3.5 million in 2019 and $3.7 million in 2020.

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation and Significant Accounting Policies
	The accompanying consolidated financial statements of the Partnership and its subsidiary have been prepared in conformity with U.S. generally accepted accounting principles. All adjustments and elimination of significant intercompany balances necessary for a fair presentation of the Partnership’s results of operations, financial position and cash flows for the periods presented have been made. All such adjustments are of a normal recurring nature. The year ended December 31, 2013, includes the combined results of OCI Holdings and its subsidiary (the "Predecessor") through September 17, 2013 and the Partnership for the period from September 18, 2013 through December 31, 2013 and unless otherwise noted, financial information for the Predecessor and the Partnership is presented before non-controlling interest. For periods prior to the IPO, the accompanying consolidated financial statements and related notes present the historical accounts of the Predecessor. To the extent they relate to periods prior to the IPO, the results are not necessarily indicative of the actual results of operations that might have occurred if we had operated as the restructured public entity during that pre-IPO period.
Reorganization and Restructuring and Non-controlling interests	Non-controlling interests
	Prior to the completion of the IPO and the restructuring transaction completed in connection therewith (the "Restructuring"), non-controlling interests in the consolidated financial statements of the Predecessor represented the 1.0% limited partner interest in OCI Wyoming owned by Wyoming Co. and the 48.51% general partner interest in OCI Wyoming owned by Anadarko, and subsequently acquired by NRP. Subsequent to the Restructuring and IPO, non-controlling interests in the consolidated financial statements of the Partnership consisted of 39.37% general partner interest and 9.63% limited partner interest in OCI Wyoming owned by NRP. In connection with the conversion of OCI Wyoming from a Delaware limited partnership to a Delaware limited liability company, NRP's general partner interest and limited partnership interest were converted into a single-class of membership interests in OCI Wyoming, which currently consists of a 49.0% membership interest in OCI Wyoming.
Use of Estimates	Use of Estimates
	The preparation of consolidated financial statements, in accordance with accounting principles generally accepted in the United States of America, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the dates of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Revenue Recognition	Revenue Recognition
	We recognize revenue when the earnings process is complete, which is generally upon transfer of title. This transfer typically occurs upon shipment to the customer, which is normally free on board ("FOB") terms or upon receipt by the customer. In all cases, we apply the following criteria in recognizing revenue: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred; (3) the selling price is fixed, determinable or reasonably estimated sales price has been agreed with the customer; and (4) collectability is reasonably assured. Customer rebates are accounted for as sales deductions. We record amounts billed for shipping and handling fees as revenue. Costs incurred for shipping and handling are recorded as costs of sales and services.
Freight Costs	Freight Costs
	The Partnership includes freight costs billed to customers for shipments administered by the Partnership in gross sales. The related freight costs along with cost of products sold are deducted from gross sales to determine gross profit.
Cash and Cash Equivalents	Cash and Cash Equivalents
	The Partnership considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents consist primarily of money market deposit accounts.
Accounts Receivable	Accounts Receivable
	Accounts receivable are carried at the original invoice amount less an estimate for doubtful receivables. The allowance for doubtful accounts is based on specifically identified amounts that the Partnership believes to be uncollectible. An additional allowance is recorded based on certain percentages of aged receivables, which are determined based on management's assessment of the general financial conditions affecting the Partnership's customer base. If actual collection experience changes, revisions to the allowance may be required. Accounts receivable are written off when deemed uncollectible. Recoveries of accounts receivable previously written off are recorded when received. During the years ended 2014, 2013 and 2012, there were no significant accounts receivable bad debt expenses, write-offs or recoveries.
Inventory	Inventory
	Inventory is carried at the lower of cost or market determined on a first-in, first-out basis. Costs include raw materials, direct labor and manufacturing overhead. Market is based on current replacement cost for raw materials and stores inventory, and finished goods is based on net realizable value.

	•	Raw material inventory includes material and natural resources being used in the mining and refining process.

	•	Finished goods inventory is the finished product soda ash.

	•	Stores inventory includes materials and supplies currently available for future use.
Property, Plant, and Equipment	Property, Plant, and Equipment
	Property, plant, and equipment are stated at cost less accumulated depreciation. Depreciation is computed over the estimated useful lives of depreciable assets, principally using the straight-line method. The estimated useful lives applied to depreciable assets are as follows:


			Useful Lives
	Land and land improvements		10 years
	Depletable land		15-60 years
	Buildings and building improvements		10-30 years
	Internal-use computer software		3-5 years
	Machinery and equipment		5-20 years
	When property, plant, and equipment are sold or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is reflected in operations for the year.
	The Partnership's policy is to evaluate property, plant, and equipment for impairment whenever events or changes in circumstances indicate that its carrying amount may not be recoverable. An indicator of potential impairment would include situations when the estimated future undiscounted cash flows are less than the carrying value. The amount of any impairment then recognized would be calculated as the difference between estimated fair value and the carrying value of the asset.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities
	The Partnership may enter into derivative contracts from time to time to manage exposure to the risk of exchange rate changes on its foreign currency transactions, the risk of changes in natural gas prices, and the risk of the variability in interest rates on borrowings. Gains and losses on derivative contracts are reported as a component of the underlying transactions. The Partnership follows hedge accounting for its hedging activities. All derivative instruments are recorded on the balance sheet at their fair values. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and the resulting designation. The Partnership designates its derivatives based upon criteria established for hedge accounting under generally accepted accounting principles. For a derivative designated as a fair value hedge, the gain or loss is recognized in earnings in the period of change together with the offsetting gain or loss on the hedged item attributed to the risk being hedged. For a derivative designated as a cash flow hedge, the effective portion of the derivative’s gain or loss is initially reported as a component of accumulated other comprehensive income (loss) and subsequently reclassified into earnings when the hedged exposure affects earnings. Any significant ineffective portion of the gain or loss is reported in earnings immediately. For derivatives not designated as hedges, the gain or loss is reported in earnings in the period of change.
Income Tax	Income Tax
	We are organized as a pass-through entity for federal income tax purposes. As a result, our partners are responsible for federal income taxes based on their respective share of taxable income. Net income for financial statement purposes may differ significantly from taxable income reportable to unitholders as a result of differences between the tax basis and financial reporting basis of assets and liabilities and the taxable income allocation requirements under the partnership agreement.
	The Partnership is a limited partnership and generally is not subject to federal or certain state income taxes. The Predecessor was subject to income tax and was included in the consolidated income tax returns of OCI Enterprises. Income taxes were allocated to the Predecessor based on separate-company computations of income or loss. The income tax expense for the year ended December 31, 2012 are those of the Predecessor. For the year ended December 31, 2013, included in income tax expense is the expense of the Predecessor through September 17, 2013.
Reclamation Costs	Reclamation Costs
	The Partnership is obligated to return the land beneath its refinery and tailings ponds to its natural condition upon completion of operations and is required to return the land beneath its rail yard to its natural condition upon termination of the various lease agreements.
	The Partnership accounts for its land reclamation liability as an asset retirement obligation, which requires that obligations associated with the retirement of a tangible long-lived asset be recorded as a liability when those obligations are incurred, with the amount of the liability initially measured at fair value. Upon initially recognizing a liability for an asset retirement obligation, an entity must capitalize the cost by recognizing an increase in the carrying amount of the related long-lived asset. Over time, the liability is accreted to its present value each period, and the capitalized cost is depreciated over the estimated useful life of the related asset. Upon settlement of the liability, an entity either settles the obligation for its recorded amount or incurs a gain or loss upon settlement.
	The estimated original liability calculated in 1996 for the refinery and tailing ponds was calculated based on the estimated useful life of the mine, which was 80 years, and on external and internal estimates as to the cost to restore the land in the future and state regulatory requirements. As a result of a revised mine reserve study, effective January 1, 2015, the mining reserve will be amortized over a remaining life of 68 years. During 2014, 2013 and 2012, the remaining life was 66, 67 and 69, respectively. The liability was discounted using credit-adjusted risk-free rates of 7% and is being accreted throughout the estimated life of the related assets to equal the total estimated costs with a corresponding entry being recorded to interest expense.
	During 2011, the Partnership constructed a rail yard to facilitate loading and switching of rail cars. The Partnership is required to restore the land on which the rail yard is constructed to its natural conditions. The estimated liability for restoring the rail yard to its natural condition is calculated based on the land lease life of 30 years and on external and internal estimates as to the cost to restore the land in the future. The liability is discounted using a credit-adjusted risk-free rate of 4.25% and is being accreted throughout the estimated life of the related assets to equal the total estimated costs with a corresponding entry being recorded to interest expense.
Fair Value of Financial Instruments	Fair Value of Financial Instruments
	Fair value is determined using a valuation hierarchy, generally by reference to an active trading market, quoted market prices or model-derived valuations for the same or similar financial instruments. See Note 16, "Fair Value Measurements," for more information.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	Equity-Based Compensation
	We recognize compensation expense related to equity-based awards, with service conditions, granted to employees based on the estimated fair value of the awards on the date of grant, net of estimated forfeitures. The grant date fair value of the equity-based awards is generally recognized on a straight-line basis over the requisite service period, which is generally the vesting period of the respective awards. Equity-based awards with market conditions are fair valued using a Monte Carlo Simulation model. See Note 11, "Equity-Based Compensation - TR Performance Unit Awards," for additional information.
Subsequent Events	Subsequent Events
	We have evaluated subsequent events through the filing of this Annual Report on Form 10-K.
Accounting Pronouncements Recently Adopted and Pending Accounting Pronouncements	Recently Issued Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) that requires companies to recognize revenue when a customer obtains control rather than when companies have transferred substantially all risks and rewards of a good or service. This update is effective for annual reporting periods beginning on or after December 15, 2016 and interim periods therein and requires expanded disclosures. We are currently assessing the impact the adoption of ASU 2014-09 will have on our consolidated financial statements.
	In June 2014, the FASB issued ASU No. 2014-12, Compensation – Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The new guidance requires that share-based compensation that require a specific performance target to be achieved in order for employees to become eligible to vest in the awards and that could be achieved after an employee completes the requisite service period be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation costs should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the period(s) for which the requisite service has already been rendered. If the performance target becomes probable of being achieved before the end of the requisite service period, the remaining unrecognized compensation cost should be recognized prospectively over the remaining requisite service period. The total amount of compensation cost recognized during and after the requisite service period should reflect the number of awards that are expected to vest and should be adjusted to reflect those awards that ultimately vest. The requisite service period ends when the employee can cease rendering service and still be eligible to vest in the award if the performance target is achieved. This new guidance is effective for fiscal years and interim periods within those years beginning after December 15, 2015. Early adoption is permitted. Entities may apply the amendments in this Update either (a) prospectively to all awards granted or modified after the effective date or (b) retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of ASU 2014-12 is not expected to have a material impact on our financial position or results of operations.

NET_INCOME_PER_UNIT_AND_CASH_D1

NET INCOME PER UNIT AND CASH DISTRIBUTION (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Calculation of net income per unit	The calculation of net income per unit is as follows:


			Years Ended
			December 31,
	($ and unit data in millions, except per unit data)		2014				2013

	Net income attributable to OCI Resources LP (1)		$	44.5			$	13

	Less: General partner's interest in net income		0.8				0.2

	Limited partners' interest in net income		$	43.7			$	12.8


	Weighted average limited partner units outstanding:
	Common - Public and OCI Holdings (basic and diluted)		9.8				9.8
	Subordinated - OCI Holdings (basic and diluted)		9.8				9.8

	Net income per limited partner unit (1):
	Common - Public and OCI Holdings (basic and diluted)		$	2.23			$	0.65

	Subordinated - OCI Holdings (basic and diluted)		$	2.23			$	0.65




	(1) Net income attributable to OCI Resources LP and net income per limited partner unit, for year ended December 31, 2013, is subsequent to initial public offering.
Calculation of net income	The calculation of limited partners' interest in net income is as follows:


		Years Ended
		December 31,
	($ in millions, except per unit data)	2014				2013
	Net income attributable to common unitholders (1):
	Distributions (2)	$	20.2			$	5.6

	Undistributed earnings	1.7				0.8

	Common unitholders' interest in net income (1)	$	21.9			$	6.4


	Net income attributable to subordinated unitholders (1):
	Distributions (2)	$	20.1			$	5.6

	Undistributed earnings	1.7				0.8

	Subordinated unitholders' interest in net income (1)	$	21.8			$	6.4


	(1) Net income and interest attributable to common and subordinated unitholders, for year ended December 31, 2013, is subsequent to initial public offering.
	(2) Distributions declared per unit for the period
Percentage allocations of distributions from operating surplus	The following table illustrates the percentage allocations of distributions from operating surplus between the unitholders and our general partner based on the specified target distribution levels. The amounts set forth under the column heading "Marginal Percentage Interest in Distributions" are the percentage interests of our general partner and the unitholders in any distributions from operating surplus we distribute up to and including the corresponding amount in the column "Total Quarterly Distribution per Unit Target Amount." The percentage interests shown for our unitholders and our general partner for the minimum quarterly distribution also apply to quarterly distribution amounts that are less than the minimum quarterly distribution. The percentage interests set forth below for our general partner (1) include a 2.0% general partner interest, (2) assume that our general partner has contributed any additional capital necessary to maintain its 2.0% general partner interest, (3) assume that our general partner has not transferred its incentive distribution rights and (4) assume there are no arrearages on common units.


				Marginal Percentage
				Interest in
				Distributions
		Total Quarterly		Unitholders			General Partner
		Distribution per Unit
		Target Amount
	Minimum Quarterly Distribution	$0.50		98	%		2	%
	First Target Distribution	above $0.5000 up to $0.5750		98	%		2	%
	Second Target Distribution	above $0.5750 up to $0.6250		85	%		15	%
	Third Target Distribution	above $0.6250 up to $0.7500		75	%		25	%
	Thereafter	above $0.7500		50	%		50	%

ACCOUNTS_RECEIVABLE_Tables

ACCOUNTS RECEIVABLE (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Schedule of Accounts Receivable	Accounts receivable, net as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014			2013
	Trade receivables	$	24.7		$	23.9

	Other receivables	10.9			10.5

		35.6			34.4

	Allowance for doubtful accounts	(0.1		)	—

	Total	$	35.5		$	34.4

INVENTORY_Tables

INVENTORY (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of inventory	Inventory as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Raw materials	$	6.4	$	5.7

	Finished goods	10.4		10.5

	Stores inventory	26.4		25.5

	Total	$	43.2	$	41.7

PROPERTY_PLANT_AND_EQUIPMENT_T

PROPERTY, PLANT AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant, and equipment, net as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014			2013
	Land and land improvements	$	0.3		$	0.3

	Depletable land	3			2

	Buildings and building improvements	129.5			128.9

	Internal-use computer software	4.5			4.1

	Machinery and equipment	595.5			594.6

	Mining reserves	65.3			65.2

	Total	798.1			795.1

	Less accumulated depreciation, depletion and amortization	(586.2		)	(580.0		)
	Total net book value	211.9			215.1

	Construction in progress	33.1			22.9

	Total property, plant, and equipment, net	$	245		$	238

ACCRUED_EXPENSES_Tables

ACCRUED EXPENSES (Tables)	12 Months Ended
	Dec. 31, 2014
Payables and Accruals [Abstract]
Schedule of accrued expenses	Accrued expenses as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Accrued freight costs	$	1.4	$	0.5

	Accrued energy costs	5.7		6.1

	Accrued royalty costs	4.4		4

	Accrued employee compensation	6.8		5.2

	Accrued other taxes	4.7		4.3

	Accrued derivatives	0.7		1.1

	Other accruals	5.8		5.2

	Total	$	29.5	$	26.4

DEBT_Tables

DEBT (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Components of long-term debt	Long-term debt as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Variable Rate Demand Revenue Bonds, principal due October 1, 2018, interest payable monthly, bearing monthly interest rate of 0.14% (2014) and 0.16% (2013)	$	11.4	$	11.4

	Variable Rate Demand Revenue Bonds, principal due August 1, 2017, interest payable monthly, bearing monthly interest rate of 0.14% (2014) and 0.16% (2013)	8.6		8.6

	OCI Wyoming Credit Facility, unsecured principal expiring on July 18, 2018, interest payable quarterly, bearing quarterly variable interest at 1.9781% (2014) and 1.996% (2013)	125		135

	Total debt	145		$	155

	Current portion of long-term debt	—		—

	Total long-term debt	$	145	$	155

Aggregate maturities on long-term debt	Aggregate maturities required on long-term debt at December 31, 2014 are as follows:


	2017	8.6

	2018	$	136.4

	Total	$	145

OTHER_NONCURRENT_LIABILITIES_T

OTHER NON-CURRENT LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Schedule of reclamation reserve	Other non-current liabilities as of December 31, 2014 and 2013 consists of the following:


	($ in millions)	2014		2013
	Reclamation reserve balance at beginning of year	$	3.8	$	3.6

	Accretion expense	0.4		0.2

	Reclamation reserve balance at end of year	$	4.2	$	3.8

EQUITY_BASED_COMPENSATION_Tabl

EQUITY - BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Restricted Unit Award Activity	The following table presents a summary of activity for the year ended December 31, 2014:


		Restricted Stock Units
	(Units in whole numbers)	Number of Units		Grant-Date Average Fair Value per Unit (1)
	Nonvested at December 31, 2013	—		$	—

	Granted (2)	19,960		25.01

	Vested	(4,101	)	25.54

	Nonvested at December 31, 2014	15,859		$	25.23




	(1) Determined by dividing the aggregate grate date fair value of awards by the number of awards issued.
	(2) The aggregate grant date fair value of time-based awards issued during 2014 was $0.5 million based on a grant date market price of our common units ranging from $24.16 to $25.54 per unit. No estimated forfeiture rate was applied to the awards as of December 31, 2014, as all awards granted are expected to vest.
Schedule of Nonvested Unit Activity	The following table presents a summary of activity for the year ended December 31, 2014:


		TR Unit Performance Awards
	(Units in whole numbers)	Number of Units		Grant-Date Average Fair Value per Unit (1)
	Nonvested at December 31, 2013	—		$	—

	Granted	7,658		35.72

	Nonvested at December 31, 2014	7,658		$	35.72




	(1) Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]	A summary of the Partnership's unrecognized compensation expense for its non-vested restricted time and performance based units, and the weighted-average periods over which the compensation expense is expected to be recognized are as following:


		Year Ended December 31, 2014
		Unrecognized Compensation Expense			Weighted Average to be Recognized
		(In millions)			(In years)
	Time-based units	$	0.3		1.85

	Performance-based units	0.2			2

	Total	$	0.5

INCOME_TAXES_Tables

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of provision for income taxes	The provision for income taxes for the years ended December 31, 2013 and 2012 includes the following:


		2013			2012
					(Predecessor)
	Current	$	6.8		$	16.6

	Deferred	0.3			(0.2		)

	Total provision for income tax	$	7.1		$	16.4

Schedule of effective tax rate	The effective tax rate (excluding net income attributable to non-controlling interest) for the years ended December 31, 2013 and 2012 includes the following:


		2013						2012
								(Predecessor)
		Amount			Rate			Amount			Rate
					Effect						Effect
	Income tax provision at federal statutory rate	$	7.1		35	%		$	18.3		35	%

	State and local income taxes net of federal tax benefit	0.5			2.36	%		0.1			0.24	%

	Permanent domestic production activity deduction	(0.4		)	(2.06	)%		(2.1		)	(4.01	)%
	Other	(0.1		)	(0.27	)%		0.1			0.23	%

	Total provision for income tax	$	7.1		35.03	%		$	16.4		31.46	%

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Contractual minimum commitments under operating leases	As of December 31, 2014, the total minimum contractual rental commitments under the Partnership's various operating leases, including renewal periods, are as follows:


	($ in millions)	Leased Land		Track Lease		Total Minimum Lease Payments

	2015	$	0.1	$	—	$	0.1

	2016	0.1		—		0.1

	2017	0.1		—		0.1

	2018	0.1		—		0.1

	2019	0.1		—		0.1

	Thereafter	1.5		0.2		1.7

	Total	$	2	$	0.2	$	2.2

AGREEMENTS_AND_TRANSACTIONS_WI1

AGREEMENTS AND TRANSACTIONS WITH AFFILIATES (Tables)	12 Months Ended
	Dec. 31, 2014
Costs Charged by Affiliates
Related Party Transaction [Line Items]
Schedule of transactions with Affiliates	The total costs charged to the Partnership by OCI Enterprises and OCI Chemical, including ANSAC related charge for the years ended December 31, 2014, 2013 and 2012 are as follows:


		Years Ended December 31,
	($ in millions)	2014			2013			2012
	OCI Enterprises	$	10.7		$	5.5		$	4

	OCI Chemical	3.4			4.4			5.2

	ANSAC	2.9			2.6			1.9

	Total selling, general and administrative expenses - Affiliates	$	17		$	12.5		$	11.1




	(1) ANSAC allocates its expenses to ANSAC’s members using a pro rata calculation based on sales.

	Cost of products sold includes logistics services charged by ANSAC. For the years ended December 31, 2014, 2013 and 2012 these costs were $9.2 million, $6.7 million and $5.8 million, respectively.
Net Sales to Affiliates
Related Party Transaction [Line Items]
Schedule of transactions with Affiliates	Net sales to affiliates for the years ended December 31, 2014, 2013 and 2012 are as follows:


			Years Ended December 31,
	($ in millions)		2014			2013			2012
	ANSAC		$	230.8		$	200.4		$	229.5

	OCI Alabama LLC		5.9			7.3			7.4

	OCI Company Limited		—			3.9			—

	Total		$	236.7		$	211.6		$	236.9

Receivables and Payables with Affiliates
Related Party Transaction [Line Items]
Schedule of transactions with Affiliates	As of December 31, 2014 and December 31, 2013, the Partnership had receivables and payables representing arm's length transactions with affiliated entities, as follows:


		As of December 31,
	($ in millions)	2014			2013			2014			2013
		Receivables from affiliates						Payables to affiliates
	OCI Enterprises	$	1.7		$	0.1		$	4.5		$	2.2

	OCI Chemical	8.7			10.5			1.4			—

	OCI Chemical Europe NV	9.2			7.8			—			—

	OCI Company Limited	—			1.9			—			—

	Other	—			0.1			1.2			0.1

	Total	$	19.6		$	20.4		$	7.1		$	2.3

MAJOR_CUSTOMERS_AND_SEGMENT_RE1

MAJOR CUSTOMERS AND SEGMENT REPORTING (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of sales by geographic area	The net sales by geographic area for the years ended December 31, 2014, 2013 and 2012 are as follows:


		Years Ended December 31,
	($ in millions)	2014		2013		2012
	Domestic	$	194.8	$	195.1	$	199.4

	International
	ANSAC	230.8		200.4		229.5

	Other	39.4		46.6		33.7

	Total international	270.2		247		263.2

	Total net sales	$	465	$	442.1	$	462.6

GENERAL_Details

GENERAL (Details) (USD $)	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Members' Equity	$0.51
Members' Equity Attributable to Noncontrolling Interest	$0.49

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	0 Months Ended		9 Months Ended	12 Months Ended
	Oct. 28, 2013	Sep. 30, 2013	Sep. 18, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 1996	Dec. 31, 2015	Dec. 31, 2011
Corporate structure and ownership
Members' Equity Attributable to Noncontrolling Interest					0.49
OCI Wyoming LP \| Natural Resource Partners LP
Corporate structure and ownership
Percentage of general partner ownership interest held		39.37%
Percentage of limited partner ownership interest held	9.63%
OCI Wyoming LP \| Predecessor \| Natural Resource Partners LP
Corporate structure and ownership
Percentage of general partner ownership interest held			48.51%
OCI Wyoming LP \| Predecessor \| OCI Wyoming Co
Corporate structure and ownership
Percentage of limited partner ownership interest held			1.00%
Asset Retirement Obligation
Corporate structure and ownership
Credit adjusted, risk-free interest rate				7.00%
Mining reserves \| Asset Retirement Obligation
Corporate structure and ownership
Useful Life				67 years	66 years	69 years	80 years
Mining reserves \| Asset Retirement Obligation \| Forecast
Corporate structure and ownership
Useful Life								68 years
Land and land improvements
Corporate structure and ownership
Useful Life					10 years
Depletable land \| Minimum
Corporate structure and ownership
Useful Life					15 years
Depletable land \| Maximum
Corporate structure and ownership
Useful Life					60 years
Buildings and building improvements \| Minimum
Corporate structure and ownership
Useful Life					10 years
Buildings and building improvements \| Maximum
Corporate structure and ownership
Useful Life					30 years
Internal-use computer software \| Minimum
Corporate structure and ownership
Useful Life					3 years
Internal-use computer software \| Maximum
Corporate structure and ownership
Useful Life					5 years
Machinery and equipment \| Minimum
Corporate structure and ownership
Useful Life					5 years
Machinery and equipment \| Maximum
Corporate structure and ownership
Useful Life					20 years
Leased Land \| Asset Retirement Obligation
Corporate structure and ownership
Useful Life									30 years
Credit adjusted, risk-free interest rate									4.25%

NET_INCOME_PER_UNIT_AND_CASH_D2

NET INCOME PER UNIT AND CASH DISTRIBUTION - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.50
General Partner
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Percentage Allocation of Operating Surplus During Subordination Period	2.00%
Percentage of general partner ownership interest held	2.00%
Up to minimum quarterly distribution \| Common unit
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Percentage Allocation of Operating Surplus During Subordination Period	98.00%
Up to minimum quarterly distribution \| General Partner
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Percentage Allocation of Operating Surplus During Subordination Period	2.00%
Up to arrearages on prior quarter minimum distributions \| Common unit
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Percentage Allocation of Operating Surplus During Subordination Period	98.00%
Up to arrearages on prior quarter minimum distributions \| General Partner
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Percentage Allocation of Operating Surplus During Subordination Period	2.00%
Up to minimum distribution for subordinated units \| Subordinated unit
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Percentage Allocation of Operating Surplus During Subordination Period	98.00%
Up to minimum distribution for subordinated units \| General Partner
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Percentage Allocation of Operating Surplus During Subordination Period	2.00%
Second Target Distribution \| General Partner
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Increasing Percentage Allocation of Operating Surplus General Partner Incentive	13.00%
Third Target Distribution \| General Partner
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Increasing Percentage Allocation of Operating Surplus General Partner Incentive	23.00%
Thereafter \| General Partner
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Increasing Percentage Allocation of Operating Surplus General Partner Incentive	48.00%

NET_INCOME_PER_UNIT_AND_CASH_D3

NET INCOME PER UNIT AND CASH DISTRIBUTION - Calculation of net income per unit (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to OCI Resources LP subsequent to initial public offering	$13	$44.50	$13
Less: General partner's interest in net income		0.8	0.2
Limited partners' interest in net income		43.7	12.8
Subordinated unit
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average common and subordinated units outstanding (basic and diluted) (shares)		9.8	9.8
Net income per common and subordinated unit (basic and diluted) (dollars per share)		$2.23	$0.65
Common unit
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average common and subordinated units outstanding (basic and diluted) (shares)		9.8	9.8
Net income per common and subordinated unit (basic and diluted) (dollars per share)		$2.23	$0.65
Subordinated Unitholders - OCI Holdings
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited partners' interest in net income		$21.80	$6.40
Weighted average common and subordinated units outstanding (basic and diluted) (shares)		9.8	9.8

NET_INCOME_PER_UNIT_AND_CASH_D4

NET INCOME PER UNIT AND CASH DISTRIBUTION - Allocation of Net Income (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2014		Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Common unitholders' interest in net income (1)		$43.70		$12.80
Cash distribution declared per unit	$0.53
Common Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributions		20.2	[1]	5.6	[1]
Undistributed earnings		1.7		0.8
Common unitholders' interest in net income (1)		21.9		6.4
Subordinated Units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributions		20.1	[1]	5.6	[1]
Undistributed earnings		1.7		0.8
Common unitholders' interest in net income (1)		$21.80		$6.40

[1]	{F\|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmI3NDUyNzA5YWJmZTQzYzA5ZWYyZjBhZmMyMGE3MmRjfFRleHRTZWxlY3Rpb246NTkxOTFCMTA0RkQ0NDBFRkNCMTdCRUY2OEMwOTI4MUUM}

NET_INCOME_PER_UNIT_AND_CASH_D5

NET INCOME PER UNIT AND CASH DISTRIBUTION - Target distributions and marginal percentage interests (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.50
Minimum Quarterly Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.50
First Target Distribution \| Minimum
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.50
First Target Distribution \| Maximum
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.57
Second Target Distribution \| Minimum
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.57
Second Target Distribution \| Maximum
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.63
Third Target Distribution \| Minimum
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.63
Third Target Distribution \| Maximum
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.75
Thereafter \| Minimum
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Minimum Quarterly Distribution	$0.75
Unitholders \| Minimum Quarterly Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	98.00%
Unitholders \| First Target Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	98.00%
Unitholders \| Second Target Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	85.00%
Unitholders \| Third Target Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	75.00%
Unitholders \| Thereafter
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	50.00%
General Partner \| Minimum Quarterly Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	2.00%
General Partner \| First Target Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	2.00%
General Partner \| Second Target Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	15.00%
General Partner \| Third Target Distribution
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	25.00%
General Partner \| Thereafter
Schedule of Percentage Allocation of Distributions From Operating Surplus [Line Items]
Marginal Interest in Distribution, Percentage	50.00%

ACCOUNTS_RECEIVABLE_Details

ACCOUNTS RECEIVABLE (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Trade receivables	$24.70	$23.90
Other receivables	10.9	10.5
Accounts receivable	35.6	34.4
Allowance for doubtful accounts	-0.1	0
Accounts receivable, net	$35.50	$34.40

INVENTORY_Details

INVENTORY (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$6.40	$5.70
Finished goods	10.4	10.5
Stores inventory	26.4	25.5
Total	$43.20	$41.70

PROPERTY_PLANT_AND_EQUIPMENT_D

PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	$798.10	$795.10
Less accumulated depreciation, depletion and amortization	-586.2	-580
Total net book value	211.9	215.1
Total property, plant, and equipment, net	245	238
Depreciation, depletion and amortization expense	22.8	23.9	23.7
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	0.3	0.3
Depletable land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	3	2
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	129.5	128.9
Internal-use computer software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	4.5	4.1
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	595.5	594.6
Mining reserves
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	65.3	65.2
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, net	$33.10	$22.90

ACCRUED_EXPENSES_Details

ACCRUED EXPENSES (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accrued freight costs	$1.40	$0.50
Accrued energy costs	5.7	6.1
Accrued royalty costs	4.4	4
Accrued employee compensation	6.8	5.2
Accrued other taxes	4.7	4.3
Accrued derivatives	0.7	1.1
Other accruals	5.8	5.2
Total	$29.50	$26.40

DEBT_Components_of_longterm_de

DEBT - Components of long-term debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt
Total debt	$145	$155
Current portion of long-term debt	0	0
Total long-term debt	145	155
Variable Rate Demand Revenue Bonds \| Principal due October 1, 2018
Debt
Total debt	11.4	11.4
Interest rate (as a percent)	0.14%	0.16%
Variable Rate Demand Revenue Bonds \| Principal due August 1, 2017
Debt
Total debt	8.6	8.6
Interest rate (as a percent)	0.14%	0.16%
OCI Wyoming credit facility
Debt
Total debt	$125	$135
Interest rate (as a percent)	1.98%	2.00%

DEBT_Maturities_of_longterm_de

DEBT - Maturities of long-term debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
2017	$8.60
2018	136.4
Total debt	$145	$155

DEBT_Narrative_Details

DEBT - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Jul. 18, 2013	Dec. 31, 2013	Dec. 31, 2016
Line of Credit Facility [Line Items]
Loss of Control Percentage Threshold	50.10%
Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$10
Revolving credit facility	0
Consolidated Fixed Charge Coverage Ratio	105.00%
maximum consolidated capital expenditures	50
Same Day Swing Line Advances \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	5
Letters of Credit \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	5
Minimum \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.28%
Maximum \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
OCI Wyoming Co \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		190
Line of Credit Facility Additional Borrowing Capacity	75
Consolidated Leverage Ratio	300.00%
Consolidated Fixed Charge Coverage Ratio	110.00%
maximum consolidated capital expenditures	50
OCI Wyoming Co \| Same Day Swing Line Advances \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	20
OCI Wyoming Co \| Letters of Credit \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	40
OCI Wyoming Co \| Minimum \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.28%
OCI Wyoming Co \| Maximum \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
Standby Letters of Credit \| OCI Wyoming LP
Line of Credit Facility [Line Items]
Revolving credit facility	20.3		$20.30
Forecast \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Consolidated Fixed Charge Coverage Ratio				110.00%
Forecast \| OCI Wyoming Co \| Bank of America, NA \| Revolving credit facility
Line of Credit Facility [Line Items]
Consolidated Fixed Charge Coverage Ratio				115.00%

OTHER_NONCURRENT_LIABILITIES_D

OTHER NON-CURRENT LIABILITIES (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Reclamation reserve
Reclamation reserve balance at beginning of year	$3.80	$3.60
Accretion expense	0.4	0.2
Reclamation reserve balance at end of year	$4.20	$3.80

EMPLOYEE_COMPENSATION_Details

EMPLOYEE COMPENSATION (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Average compensation period	60 months
Period of last service	120 months
Pension
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$3.10	$8.40	$9
401(k)
Defined Benefit Plan Disclosure [Line Items]
Contributions by OCI Enterprises	2.4	2.8	2.4
Postretirement benefit
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	-0.3	-0.1	2.2
Benefit obligation	22.8	21
Decrease in postretirement benefits due to amendments		8.7
Prior service credit		$7.70

EQUITY_BASED_COMPENSATION_Narr

EQUITY - BASED COMPENSATION (Narrative) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	928,099
Units granted	7,941
Equity-based compensation plan activity	($0.40)
TSR Unit Performance Awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Payout range	0.00%
TSR Unit Performance Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Payout range	200.00%
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation plan activity	$0.20

EQUITY_BASED_COMPENSATION_Deta

EQUITY - BASED COMPENSATION (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restricted Unit Awards
Number of Units
Nonvested at	0
Granted	19,960
Vested	-4,101
Nonvested at	15,859
Grant-Date Average Fair Value per Unit
Nonvested at	$25.23	$0
Granted	$25.01
Vested	$25.54
Nonvested at	$25.23	$0
Aggregate grant date fair value	$0.50
Restricted Unit Awards \| Minimum
Grant-Date Average Fair Value per Unit
Grant date market price	$24.16
Restricted Unit Awards \| Maximum
Grant-Date Average Fair Value per Unit
Grant date market price	$25.54
TSR Unit Performance Awards
Number of Units
Nonvested at	0
Granted	7,658
Nonvested at	7,658
Grant-Date Average Fair Value per Unit
Nonvested at	$35.72	$0
Granted	$35.72
Nonvested at	$35.72	$0

EQUITY_BASED_COMPENSATION_Unre

EQUITY - BASED COMPENSATION (Unrecognized Compensation Expense) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Expense	$0.50
Time-based units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Expense	0.3
Weighted Average to be Recognized	1 year 10 months 6 days
Performance-based units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unrecognized Compensation Expense	$0.20
Weighted Average to be Recognized	2 years

INCOME_TAXES_Provision_Details

INCOME TAXES - Provision (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Examination [Line Items]
Current		$6.80
Deferred	0	0.3
Total provision for income tax	0	7.1
Predecessor
Income Tax Examination [Line Items]
Current			16.6
Deferred		0.3	-0.2
Total provision for income tax		$7.10	$16.40

INCOME_TAXES_Effective_Tax_Rat

INCOME TAXES - Effective Tax Rate Reconciliation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amount
Income tax provision at federal statutory rate		$7.10
State and local income taxes net of federal tax benefit		0.5
Permanent domestic production activity deduction		-0.4
Other		-0.1
Total provision for income tax	0	7.1
Rate Effect
Income tax provision at federal statutory rate		35.00%
State and local income taxes net of federal tax benefit		2.36%
Permanent domestic production activity deduction		-2.06%
Other		-0.27%
Total provision for income tax		35.03%
Predecessor
Amount
Income tax provision at federal statutory rate			18.3
State and local income taxes net of federal tax benefit			0.1
Permanent domestic production activity deduction			-2.1
Other			0.1
Total provision for income tax		$7.10	$16.40
Rate Effect
Income tax provision at federal statutory rate			35.00%
State and local income taxes net of federal tax benefit			0.24%
Permanent domestic production activity deduction			-4.01%
Other			0.23%
Total provision for income tax			31.46%

COMMITMENTS_AND_CONTINGENCIES_1

COMMITMENTS AND CONTINGENCIES - Narrative (Details) (USD $)	12 Months Ended
COMMITMENTS AND CONTINGENCIES - Narrative (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Other Commitments [Line Items]
Annual rent		$60,000
Purchase Obligation, Fiscal Year Maturity [Abstract]
Average annual cost	3,600,000
Easement
Other Commitments [Line Items]
Annual rent		15,000
Self-bond agreement for reclamation costs
Purchase Obligation, Fiscal Year Maturity [Abstract]
Off balance sheet commitment	33,900,000	27,100,000
Watco Companies, LLC
Other Commitments [Line Items]
Leases term		10 years
Rock Springs Grazing Association
Other Commitments [Line Items]
Renewal term		5 years
Total renewal term		30 years
Union Pacific Company
Other Commitments [Line Items]
Leases term		10 years
Minimum
Other Commitments [Line Items]
Leases term	1 year
Maximum
Other Commitments [Line Items]
Leases term	10 years
Commodity
Other Commitments [Line Items]
Leases term	5 years
Purchase Obligation, Fiscal Year Maturity [Abstract]
Purchase Obligation	66,100,000
Purchase Obligation, Due in 2015	22,400,000
Purchase Obligation, Due in 2016	16,100,000
Purchase Obligation, Due in 2017	13,300,000
Purchase Obligation, Due in 2018	8,000,000
Purchase Obligation, Due in 2019	$6,300,000

COMMITMENTS_AND_CONTINGENCIES_2

COMMITMENTS AND CONTINGENCIES - Commitments (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified	Dec. 31, 2014
Other Commitments [Line Items]
2015	$0.10
2016	0.1
2017	0.1
2018	0.1
2019	0.1
Thereafter	1.7
Total	2.2
Rail Car Lease
Other Commitments [Line Items]
2015	9.7
2016	7.1
2017	5.7
2018	4.4
2019	3.6
Thereafter	4.2
Leased Land
Other Commitments [Line Items]
2015	0.1
2016	0.1
2017	0.1
2018	0.1
2019	0.1
Thereafter	1.5
Total	2
Track Lease
Other Commitments [Line Items]
2015	0
2016	0
2017	0
2018	0
2019	0
Thereafter	0.2
Total	$0.20

AGREEMENTS_AND_TRANSACTIONS_WI2

AGREEMENTS AND TRANSACTIONS WITH AFFILIATES - Costs charged by affiliates (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Cost of products sold	$201.60
Total selling, general and administrative expenses - Affiliates	17	12.5	11.1
OCI Enterprises
Related Party Transaction [Line Items]
Total selling, general and administrative expenses - Affiliates	10.7	5.5	4
OCI Chemical
Related Party Transaction [Line Items]
Total selling, general and administrative expenses - Affiliates	3.4	4.4	5.2
ANSAC
Related Party Transaction [Line Items]
Cost of products sold	9.2	6.7	5.8
Total selling, general and administrative expenses - Affiliates	$2.90	$2.60	$1.90

AGREEMENTS_AND_TRANSACTIONS_WI3

AGREEMENTS AND TRANSACTIONS WITH AFFILIATES - Net sales to affiliates (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction [Line Items]
Total	$236.70	$211.60	$236.90
ANSAC
Related Party Transaction [Line Items]
Total	230.8			200.4	229.5
OCI Alabama LLC
Related Party Transaction [Line Items]
Total	5.9			7.3	7.4
OCI Company Limited
Related Party Transaction [Line Items]
Total	$0			$3.90	$0

AGREEMENTS_AND_TRANSACTIONS_WI4

AGREEMENTS AND TRANSACTIONS WITH AFFILIATES - Receivables from or payables to affiliates (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Receivables from affiliates	$19.60	$20.40
Payables to affiliates	7.1	2.3
OCI Enterprises
Related Party Transaction [Line Items]
Receivables from affiliates	1.7	0.1
Payables to affiliates	4.5	2.2
OCI Chemical
Related Party Transaction [Line Items]
Receivables from affiliates	8.7	10.5
Payables to affiliates	1.4	0
OCI Chemical Europe NV
Related Party Transaction [Line Items]
Receivables from affiliates	9.2	7.8
Payables to affiliates	0	0
Other
Related Party Transaction [Line Items]
Receivables from affiliates	0	0.1
Payables to affiliates	1.2	0.1
OCI Company Limited
Related Party Transaction [Line Items]
Receivables from affiliates	0	1.9
Payables to affiliates	$0	$0

MAJOR_CUSTOMERS_AND_SEGMENT_RE2

MAJOR CUSTOMERS AND SEGMENT REPORTING - Sales by geographic area (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sales by geographical area
Sales	$465	$465	$442.10	$462.60
Domestic
Sales by geographical area
Sales		194.8	195.1	199.4
International
Sales by geographical area
Sales		270.2	247	263.2
International \| ANSAC
Sales by geographical area
Sales		230.8	200.4	229.5
International \| Other
Sales by geographical area
Sales		$39.40	$46.60	$33.70

MAJOR_CUSTOMERS_AND_SEGMENT_RE3

MAJOR CUSTOMERS AND SEGMENT REPORTING - Narrative (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	segment	customer
		segment
Segment Reporting [Abstract]
Number of operating segments	1	1
Number of significant customers other than ANSAC		0

FAIR_VALUE_MEASUREMENTS_Detail

FAIR VALUE MEASUREMENTS (Details) (Fair Value, Measurements, Recurring, Level 2, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative aggregate notional value	$76	$101.50
Derivative fair value	0.7	0.5
Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative aggregate notional value	6.9	26.4
Derivative asset	0.6
Derivative liability	$0.50

SUBSEQUENT_EVENTS_Details

SUBSEQUENT EVENTS (Details) (USD $)	3 Months Ended	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Jan. 16, 2015	Feb. 24, 2015
Subsequent Event [Line Items]
Cash distribution declared per unit	$0.53
Subsequent Event
Subsequent Event [Line Items]
Cash distribution		$22
Purchase Obligation			17.6
Purchase Obligation, Future Minimum Payments, Remainder of Fiscal Year			0.9
Purchase Obligation, Due in Second Year			2.9
Purchase Obligation, Due in Third Year			3.2
Purchase Obligation, Due in Fourth Year			3.4
Purchase Obligation, Due in Fifth Year			3.5
Purchase Obligation, Due after Fifth Year			$3.70