Terra Nitrogen Co L P 10-Q 7 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	6-May-15
Document and Entity Information
Entity Registrant Name	TERRA NITROGEN CO L P /DE
Entity Central Index Key	879575
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Entity Common Stock, Shares Outstanding		18,501,576

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$60	$113
Due from affiliates of the General Partner	25	25.2
Accounts receivable	0.3	0.4
Inventories	6	9.6
Prepaid expenses and other current assets	1.4	0.3
Total current assets	92.7	148.5
Property, plant and equipment, net	312.3	259.4
Other assets	6.8	7.9
Total assets	411.8	415.8
Current liabilities:
Accounts payable and accrued expenses	43.4	32.4
Due to affiliates of the General Partner	8.2	4.2
Other current liabilities	1.3	3.6
Total current liabilities	52.9	40.2
Noncurrent liabilities	1.1	0.7
Partners' capital:
General partner's interest	61.8	70
Total partners' capital	357.8	374.9
Total liabilities and partners' capital	411.8	415.8
Common Units
Partners' capital:
Limited partners' interests, 18,501,576 Common Units authorized, issued and outstanding; 184,072 Class B Common Units authorized, issued and outstanding	293.9	302.7
Class B Common Units
Partners' capital:
Limited partners' interests, 18,501,576 Common Units authorized, issued and outstanding; 184,072 Class B Common Units authorized, issued and outstanding	$2.10	$2.20

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical)	Mar. 31, 2015	Dec. 31, 2014
Common Units
Limited Partners' interests, common units authorized	18,501,576	18,501,576
Common units issued	18,501,576	18,501,576
Common units outstanding	18,501,576	18,501,576
Class B Common Units
Limited Partners' interests, common units authorized	184,072	184,072
Common units issued	184,072	184,072
Common units outstanding	184,072	184,072

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net sales:
Other income	$0.20	$0.30
Total	126.6	177.7
Cost of goods sold:
Materials, supplies and services	54	64.6
Gross margin	65	107.5
Other general and administrative expenses	2.1	0.7
Allocation of net earnings:
Net earnings	59	102.9
Net earnings per Common Unit (in dollars per unit)	$2.03	$3.26
Affiliate of General Partner
Net sales:
Product sales to an affiliate of the General Partner	126.3	177.3
Other income	0.1	0.1
Cost of goods sold:
Services provided by affiliates of the General Partner	7.6	5.6
Selling, general and administrative services provided by affiliates of the General Partner	3.9	3.9
General Partner
Allocation of net earnings:
Net earnings	20.9	41.5
Common Units | Class B Common Units
Allocation of net earnings:
Net earnings	0.6	1
Common Units | Common Units
Allocation of net earnings:
Net earnings	$37.50	$60.40

CONSOLIDATED_STATEMENTS_OF_PAR

CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (USD $)	Total	General Partner	Common Units	Class B Common Units
In Millions, unless otherwise specified				Common Units
Partners' capital at Dec. 31, 2013	$309	$43	$264.50	$1.50
Increase (Decrease) in Partners' Capital
Net earnings	102.9	41.5	60.4	1
Distributions	-61.1	-21.7	-38.8	-0.6
Partners' capital at Mar. 31, 2014	350.8	62.8	286.1	1.9
Partners' capital at Dec. 31, 2014	374.9	70	302.7	2.2
Increase (Decrease) in Partners' Capital
Net earnings	59	20.9	37.5	0.6
Distributions	-76.1	-29.1	-46.3	-0.7
Partners' capital at Mar. 31, 2015	$357.80	$61.80	$293.90	$2.10

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating Activities:
Net earnings	$59	$102.90
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	5.3	7.6
Unrealized (gain) loss on derivatives	-3.1	2.9
Loss on disposal of property, plant and equipment	1	0
Changes in operating assets and liabilities:
Accounts receivable	0.1	0.4
Inventories	3.6	0.5
Accounts payable and accrued expenses	-0.4	3.7
Due to/from affiliates of the General Partner	4.2	-5.1
Other assets and liabilities	1.2	-0.4
Net cash provided by operating activities	70.9	112.5
Investing Activities:
Additions to property, plant and equipment	-47.8	-16.4
Net cash used in investing activities	-47.8	-16.4
Financing Activities:
Partnership distributions paid	-76.1	-61.1
Other	0	-8
Net cash used in financing activities	-76.1	-69.1
(Decrease) increase in cash and cash equivalents	-53	27
Cash and cash equivalents at beginning of period	113	86.9
Cash and cash equivalents at end of period	$60	$113.90

Background_and_Basis_of_Presen

Background and Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Background and Basis of Presentation	Background and Basis of Presentation
	Terra Nitrogen Company, L.P. (TNCLP, we, our or us) is a Delaware limited partnership that produces nitrogen fertilizer products. Our principal products are anhydrous ammonia (ammonia) and urea ammonium nitrate solutions (UAN), which we manufacture at our facility in Verdigris, Oklahoma.
	We conduct our operations through an operating partnership, Terra Nitrogen, Limited Partnership (TNLP or the Operating Partnership, and collectively with TNCLP, the Partnership). Terra Nitrogen GP Inc. (TNGP or the General Partner), a Delaware corporation, is the General Partner of both TNCLP and TNLP and owns a consolidated 0.05% general partner interest in the Partnership. The General Partner is an indirect, wholly-owned subsidiary of CF Industries Holdings, Inc. (CF Industries), a Delaware corporation. Ownership of TNCLP is comprised of the general partner interests and the limited partner interests. Limited partner interests are represented by common units, which are listed for trading on the New York Stock Exchange under the symbol "TNH," and Class B common units. As of March 31, 2015, we had 18,501,576 common units and 184,072 Class B common units issued and outstanding. CF Industries through its subsidiaries owned 13,889,014 common units (representing approximately 75% of the total outstanding common units) and all of the Class B common units as of March 31, 2015.
	The accompanying unaudited interim consolidated financial statements have been prepared on the same basis as our audited consolidated financial statements for the year ended December 31, 2014, in accordance with accounting principles generally accepted in the United States for interim financial reporting. In the opinion of management, these statements reflect all adjustments, consisting only of normal and recurring adjustments, that are necessary for the fair representation of the information for the periods presented. The unaudited interim consolidated financial statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations. Operating results for any period presented apply to that period only and are not necessarily indicative of results for any future period.
	The preparation of the unaudited interim consolidated financial statements requires management to make use of estimates and assumptions that affect the reported amount of assets and liabilities, revenue and expenses and certain financial statement disclosures. Actual results could differ from these estimates. Significant estimates and assumptions in these unaudited interim consolidated financial statements include net realizable value of inventories, environmental remediation liabilities, environmental and litigation contingencies, useful lives of property, plant and equipment, and the assumptions used in the evaluation of potential impairment of property, plant and equipment.
	The accompanying unaudited interim consolidated financial statements should be read in conjunction with our audited consolidated financial statements and related disclosures included in our 2014 Annual Report on Form 10-K filed with the SEC on February 26, 2015.
	Throughout this document, the term "affiliates of the General Partner" refers to consolidated subsidiaries of CF Industries, including TNGP.

New_Accounting_Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards	New Accounting Standards
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers, which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition. This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments. Additionally, information concerning the costs to obtain and fulfill a contract, including assets to be recognized, is to be disclosed. This ASU is effective for interim and annual reporting periods beginning after December 15, 2016. In April 2015, the FASB voted to propose to defer the effective date of this ASU by one year, with early adoption on the original effective date permitted. We are currently evaluating the impact of the adoption of this ASU on our consolidated financial statements.

Agreement_of_Limited_Partnersh

Agreement of Limited Partnership	3 Months Ended
	Mar. 31, 2015
Partners' Capital Notes [Abstract]
Agreement of Limited Partnership	Agreement of Limited Partnership
	We make quarterly distributions to holders of our general partner interest and limited partner interests based on Available Cash for the quarter as defined in our agreement of limited partnership. Available Cash is defined generally as all cash receipts less all cash disbursements, less certain reserves (including reserves for future operating and capital needs) established as the General Partner determines in its reasonable discretion to be necessary or appropriate. Changes in working capital affect Available Cash as changes in the amount of cash invested in working capital items (such as increases in inventory and decreases in accounts payable) reduce Available Cash, while declines in the amount of cash invested in working capital items increase Available Cash. During the three months ended March 31, 2015 and 2014, we declared and paid partnership distributions of $76.1 million and $61.1 million, respectively.
	We receive 99% of the Available Cash from the Operating Partnership and 1% is distributed by the Operating Partnership to the General Partner. Cash distributions from the Operating Partnership generally represent the Operating Partnership's Available Cash from operations. Our cash distributions are made 99.975% to common and Class B common unitholders and 0.025% to the General Partner except when cumulative distributions of Available Cash exceed specified target levels above the Minimum Quarterly Distributions (MQD) of $0.605 per unit. Under such circumstances, the General Partner is entitled to receive Incentive Distribution Rights.
	On May 6, 2015, we announced a $2.08 cash distribution per common limited partnership unit, payable on May 29, 2015 to holders of record as of May 18, 2015. In the first quarter of 2015, we exceeded the cumulative MQD amounts and will distribute Available Cash as summarized in the following table:
		Income and Distribution Allocation
		Target		Target		Common		Class B		General		Total
		Limit		Increment		Units		Common		Partner
								Units
	Minimum Quarterly Distributions	$	0.605	$	0.605	98.99	%	0.985	%	0.025	%	100	%
	First Target	0.715		0.11		98.99	%	0.985	%	0.025	%	100	%
	Second Target	0.825		0.11		85.859	%	0.985	%	13.156	%	100	%
	Third Target	1.045		0.22		75.758	%	0.985	%	23.257	%	100	%
	Final Target and Beyond	>1.045		—		50.505	%	0.985	%	48.51	%	100	%
	The General Partner is required to remit the majority of cash distributions it receives from the Partnership, in excess of its 1% Partnership equity interest, to an affiliated company.
	As of March 31, 2015, the General Partner and its affiliates owned 75.3% of our outstanding units. When not more than 25% of our issued and outstanding units are held by non-affiliates of the General Partner, as was the case at March 31, 2015, we, at the General Partner's sole discretion, may call, or assign to the General Partner or its affiliates, our right to acquire all, but not less than all, such outstanding units held by non-affiliated persons. If the General Partner elects to acquire all outstanding units, we are required to give at least 30 but not more than 60 days' notice of our decision to purchase the outstanding units. The purchase price per unit will be the greater of (1) the average of the previous 20 trading days' closing prices as of the date five days before the purchase is announced or (2) the highest price paid by the General Partner or any of its affiliates for any unit within the 90 days preceding the date the purchase is announced.

Net_Earnings_per_Common_Unit

Net Earnings per Common Unit	3 Months Ended
	Mar. 31, 2015
Earnings Per Unit [Abstract]
Net Earnings per Common Unit	Net Earnings per Common Unit
	Net earnings per common unit are based on the weighted-average number of common units outstanding during the period. The following table provides a calculation for net earnings per common unit for the three months ended March 31, 2015 and 2014:
		Three months ended
		March 31,
		2015		2014
		(in millions)
	Basic earnings per Common Unit:
	Net earnings	$	59	$	102.9
	Less: Net earnings allocable to General Partner	20.9		41.5
	Less: Net earnings allocable to Class B Common Units	0.6		1
	Net earnings allocable to Common Units	$	37.5	$	60.4
	Weighted-average Common Units outstanding	18.5		18.5
	Net earnings per Common Unit	$	2.03	$	3.26
	There were no dilutive TNCLP units outstanding for the three months ended March 31, 2015 and 2014.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories
	Inventories consisted of the following:
		March 31,		December 31,
		2015		2014
		(in millions)
	Finished goods	$	3.3	$	7.8
	Materials and supplies	2.7		1.8
	Total	$	6	$	9.6

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments
	Derivative financial instruments are executed on our behalf by an affiliate of the General Partner to reduce our exposure to changes in commodity prices for natural gas. Natural gas is the largest and most volatile component of the manufacturing cost for nitrogen-based fertilizers.
	The derivatives that we use are primarily natural gas fixed price swaps and options traded in the over-the-counter (OTC) markets. The derivative contract prices are based on NYMEX future prices based on physical delivery of natural gas at the Henry Hub in Louisiana, the most common and financially-liquid location of reference for derivative financial instruments related to natural gas. However, we purchase natural gas for our manufacturing facility from suppliers whose prices are based primarily on the ONEOK index (based on physical delivery of natural gas in Oklahoma, rather than at the Henry Hub). This creates a location basis differential between the derivative contract price and the price we pay for physical delivery of natural gas. Accordingly, the prices underlying the derivative financial instruments we use may not exactly match the prices of natural gas we purchase and consume. These natural gas derivative contracts are scheduled to coincide with our anticipated purchases of natural gas used to manufacture nitrogen products during those future periods. We use natural gas derivatives as an economic hedge of gas price risk, but without the application of hedge accounting.
	We report derivatives on our consolidated balance sheets at fair value. Changes in fair value are recognized in cost of sales in the period of change. Cash flows related to natural gas derivatives are classified as operating activities.
	The gross fair values of derivatives on our consolidated balance sheets are shown below. All balance sheet amounts from derivatives arise from natural gas derivatives that are not designated as hedging instruments. For additional information on derivative fair values, see Note 7—Fair Value Measurements.
		March 31,			December 31,
		2015			2014
		(in millions)
	Unrealized gains in other current assets	$	0.8		$	0.1
	Unrealized losses in other current liabilities	(1.2		)	(3.6		)
	Net unrealized derivative gains (losses)	$	(0.4	)	$	(3.5	)
	The effect of derivatives in our consolidated statements of operations is shown below. All amounts arise from natural gas derivatives that are not designated as hedging instruments and are recorded in cost of goods sold.
		Three months ended
		March 31,
		2015			2014
		(in millions)
	Unrealized mark-to-market gains (losses)	$	3.9		$	(4.0	)
	Realized (losses) gains	(4.6		)	9.9
	Net derivative (losses) gains	$	(0.7	)	$	5.9
	As of March 31, 2015 and December 31, 2014, we had open derivative contracts for 12.6 million MMBtus and 7.6 million MMBtus, respectively, of natural gas. For the three months ended March 31, 2015, we used derivatives to cover approximately 100% of our natural gas consumption.
	As of March 31, 2015 and December 31, 2014, the aggregate fair value of the derivative instruments with credit-risk-related contingent features in a net liability position were $1.2 million and $3.6 million, respectively, which also approximates the fair value of the maximum amount of additional collateral that would need to be posted or assets needed to settle the obligations if the credit-risk-related contingent features were triggered at the reporting dates. At both March 31, 2015 and December 31, 2014, we had no cash collateral on deposit with counterparties for derivative contracts. The credit support documents executed in connection with ISDA agreements generally provide the right to set off collateral against amounts owing under the ISDA agreements upon the occurrence of a default or a specified termination event.
	The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of March 31, 2015 and December 31, 2014:
		Gross and net amounts			Gross amounts
		presented in			not offset in consolidated
		consolidated			balance sheets
		balance sheets(1)			Financial			Cash		Net
					instruments			collateral		amount
								received
								(pledged)
		(in millions)
	31-Mar-15
	Total derivative assets	$	0.8		$	1.2		$	—	$	(0.4	)
	Total derivative liabilities	1.2			1.2			—		—
	Net assets (liabilities)	$	(0.4	)	$	—		$	—	$	(0.4	)
	31-Dec-14
	Total derivative assets	$	0.1		$	3.6		$	—	$	(3.5	)
	Total derivative liabilities	3.6			3.6			—		—
	Net assets (liabilities)	$	(3.5	)	$	—		$	—	$	(3.5	)
	_______________________________________________________________________________
	(1)	We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheets. As a result, amounts recognized and net amounts presented are the same.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	Assets and Liabilities Measured at Fair Value on a Recurring Basis
	The following table presents assets and liabilities included in our consolidated balance sheets that are recognized at fair value on a recurring basis, and indicates the fair value hierarchy utilized to determine such fair value as of March 31, 2015 and December 31, 2014.
		Balances as of March 31, 2015
		Total			Quoted		Significant			Significant
					Market Prices		Other			Unobservable
					in Active		Observable			Inputs
					Markets		Inputs			(Level 3)
					(Level 1)		(Level 2)
		(in millions)
	Cash and cash equivalents	$	60		$	60	$	—		$	—
	Unrealized gains on natural gas derivatives	0.8			—		0.8			—
	Total assets at fair value	$	60.8		$	60	$	0.8		$	—
	Unrealized losses on natural gas derivatives	$	(1.2	)	$	—	$	(1.2	)	$	—
	Total liabilities at fair value	$	(1.2	)	$	—	$	(1.2	)	$	—
		Balances as of December 31, 2014
		Total			Quoted		Significant			Significant
					Market Prices		Other			Unobservable
					in Active		Observable			Inputs
					Markets		Inputs			(Level 3)
					(Level 1)		(Level 2)
		(in millions)
	Cash and cash equivalents	$	113		$	113	$	—		$	—
	Unrealized gains on natural gas derivatives	0.1			—		0.1			—
	Total assets at fair value	$	113.1		$	113	$	0.1		$	—
	Unrealized losses on natural gas derivatives	$	(3.6	)	$	—	$	(3.6	)	$	—
	Total liabilities at fair value	$	(3.6	)	$	—	$	(3.6	)	$	—
	Cash and Cash Equivalents
	As of March 31, 2015 and December 31, 2014, our cash and cash equivalents consisted primarily of U.S. Treasury bills with original maturities of three months or less and money market mutual funds that invest in U.S. government obligations.
	Natural Gas Derivatives
	The derivative instruments that we use are primarily natural gas fixed price swaps and options traded in the OTC markets with multi-national commercial banks, other major financial institutions and large energy companies. The derivatives are traded in months forward and settlements are scheduled to coincide with anticipated gas purchases during those future periods. These contracts settle using NYMEX futures prices and accordingly, to determine the fair value of these instruments, we use quoted market prices from NYMEX and standard pricing models with inputs derived from or corroborated by observable market data such as forward curves supplied by an industry-recognized unrelated third party. See Note 6—Derivative Financial Instruments for additional information.

Property_Plant_and_Equipment_n

Property, Plant and Equipment, net	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
	Property, plant and equipment, net consisted of the following:
		March 31,			December 31,
		2015			2014
		(in millions)
	Land	$	1.6		$	1.6
	Buildings and improvements	8.1			8.1
	Machinery and equipment	430.7			401.4
	Construction in progress	131.4			109.2
		571.8			520.3
	Less: Accumulated depreciation and amortization	259.5			260.9
		$	312.3		$	259.4
	During the three months ended March 31, 2015, we recorded a loss of approximately $1.0 million on the disposal of certain machinery and equipment, which is included in other general and administrative expenses on our consolidated statement of operations.
	Plant turnarounds—Scheduled inspections, replacements and overhauls of machinery and equipment at our continuous process manufacturing facility are referred to as plant turnarounds. The expenditures related to turnarounds are capitalized in property, plant and equipment when incurred. The following is a summary of plant turnaround activity:
		Three months ended
		March 31,
		2015			2014
		(in millions)
	Net capitalized turnaround costs:
	Beginning balance	$	16.7		$	22.7
	Additions	29.4			0.3
	Depreciation	(1.6		)	(1.6		)
	Ending balance	$	44.5		$	21.4
	Scheduled replacements and overhauls of machinery and equipment include the dismantling, repair or replacement and installation of various components including piping, valves, motors, turbines, pumps, compressors, heat exchangers and the replacement of catalyst when a full plant shutdown occurs. Scheduled inspections are also conducted during full plant shutdowns, including required safety inspections which entail the disassembly of various components such as steam boilers, pressure vessels and other equipment requiring safety certifications. Internal employee costs and overhead are not considered turnaround costs and are not capitalized.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
	TNCLP and TNGP have no employees. We have entered into several agreements with a subsidiary of CF Industries relating to the operation of our business and the sale of the fertilizer products produced at our Verdigris facility. We believe that each of these agreements is on terms that are fair and reasonable to us.
	General and Administrative Services and Product Offtake Agreement
	Pursuant to the Amendment to the General and Administrative Services and Product Offtake Agreement (the Services and Offtake Agreement), the Partnership sells all of its fertilizer products to an affiliate of the General Partner at prices based on market prices for the Partnership's fertilizer products as defined in the Services and Offtake Agreement. Title and risk of loss transfer to an affiliate of the General Partner as the product is shipped from the plant gate. The Services and Offtake Agreement is effective for annual terms starting as of January 1st and will be extended automatically for successive one-year terms unless terminated by one of the parties prior to renewal.
	Directly Incurred Charges
	Since we have no employees, we rely on employees from an affiliate of the General Partner to operate our Verdigris facility. As a result, the payroll, payroll-related expenses and benefits, such as health insurance and pension, incurred by an affiliate of the General Partner, are directly charged to us. Payroll, payroll-related expenses and other employee-related benefits directly charged to us were $7.6 million and $5.6 million for the three months ended March 31, 2015 and 2014, respectively. We report these expenses as services provided by affiliates of the General Partner in cost of goods sold.
	Allocated Charges
	CF Industries, together with its affiliates, also provides certain services to us under the Services and Offtake Agreement. These services include production planning, manufacturing management, logistics, procurement, accounting, legal, risk management, investor relations and other general and administrative functions. Allocated expenses charged to us for each of the three-month periods ended March 31, 2015 and 2014 were $3.9 million. We report these expenses as selling, general and administrative services provided by affiliates of the General Partner.
	Amounts Due to/from Affiliates of the General Partner
	We receive cash and make expenditures directly from our cash accounts. Because we sell our products to and receive payroll and other related services from affiliates of the General Partner, the affiliates of the General Partner continue to be both debtors and creditors to us. As of March 31, 2015 and December 31, 2014, we had a net balance due from affiliates of the General Partner of $16.8 million and $21.0 million, respectively.
	Spare Parts Sharing Agreement
	Affiliates of CF Industries own and operate nitrogen fertilizer complexes that utilize some equipment that is similar to equipment at our Verdigris nitrogen complex. Each of the various manufacturing complexes maintains spare parts for use in its facilities. In the event that an unplanned need arises and to help minimize manufacturing downtime, we have entered into a spare parts sharing agreement that permits spare parts to be shared among the manufacturing complexes from time to time. Parts that are borrowed from another complex under the agreement are either refurbished and returned to the lender or replaced.
	Leases
	We entered into an amended and restated lease with an affiliate of the General Partner under which the ammonia assets in our terminal in Blair, Nebraska are leased by the affiliate. The lease is effective for a five-year term ending on December 31, 2018, and the affiliate of the General Partner has options to renew for three additional five-year terms. The quarterly lease payment is $100,000, subject to an annual inflation adjustment, and additional rent will be paid equal to all costs, expenses, and obligations incurred by the affiliate of the General Partner related to the use, occupancy and operation of the terminal.
	We also have leased certain of our rail cars to an affiliate of the General Partner for quarterly market-based rental payments of $3,600 per car. This lease was effective initially for a one-year term and is extended automatically for successive one-year terms unless terminated by either party thereto prior to renewal.
	We recognized rental income for each of the three-month periods ended March 31, 2015 and 2014 of $0.1 million.

Subsequent_Event

Subsequent Event	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event
	On May 6, 2015, the Internal Revenue Service (“IRS”) issued proposed regulations on the types of income and activities which constitute qualified income of a Master Limited Partnership (“MLP”). The proposed regulations would have the effect of limiting the types of income and activities which qualify under the MLP rules, subject to certain transition provisions. The IRS proposal specifically highlights companies that perform chemical processing and transformation activities as one of the focuses of the proposed changes, but the proposed regulations do not contain specific proposals regarding fertilizer-related activities. The proposed regulations reserve on the provisions relating to fertilizer activities.
	Our tax treatment for federal income tax purposes depends on our status as an MLP. Currently, no federal income taxes are paid by the Partnership due to our MLP status. Any change in the tax treatment of qualified income of fertilizer-related activities could have a material impact on the taxation of the Partnership and could have a material adverse impact on unit holder distributions. The Partnership will continue to monitor the IRS regulatory activities.

New_Accounting_Pronouncements_

New Accounting Pronouncements and Changes in Accounting Principles (Policies)	3 Months Ended
	Mar. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards	New Accounting Standards
	In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers, which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition. This ASU is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments. Additionally, information concerning the costs to obtain and fulfill a contract, including assets to be recognized, is to be disclosed. This ASU is effective for interim and annual reporting periods beginning after December 15, 2016. In April 2015, the FASB voted to propose to defer the effective date of this ASU by one year, with early adoption on the original effective date permitted. We are currently evaluating the impact of the adoption of this ASU on our consolidated financial statements.

Agreement_of_Limited_Partnersh1

Agreement of Limited Partnership (Tables)	3 Months Ended
	Mar. 31, 2015
Partners' Capital Notes [Abstract]
Summary of available cash distribution	In the first quarter of 2015, we exceeded the cumulative MQD amounts and will distribute Available Cash as summarized in the following table:
		Income and Distribution Allocation
		Target		Target		Common		Class B		General		Total
		Limit		Increment		Units		Common		Partner
								Units
	Minimum Quarterly Distributions	$	0.605	$	0.605	98.99	%	0.985	%	0.025	%	100	%
	First Target	0.715		0.11		98.99	%	0.985	%	0.025	%	100	%
	Second Target	0.825		0.11		85.859	%	0.985	%	13.156	%	100	%
	Third Target	1.045		0.22		75.758	%	0.985	%	23.257	%	100	%
	Final Target and Beyond	>1.045		—		50.505	%	0.985	%	48.51	%	100	%

Net_Earnings_per_Common_Unit_T

Net Earnings per Common Unit (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Unit [Abstract]
Schedule of calculation for net earnings per common unit	The following table provides a calculation for net earnings per common unit for the three months ended March 31, 2015 and 2014:
		Three months ended
		March 31,
		2015		2014
		(in millions)
	Basic earnings per Common Unit:
	Net earnings	$	59	$	102.9
	Less: Net earnings allocable to General Partner	20.9		41.5
	Less: Net earnings allocable to Class B Common Units	0.6		1
	Net earnings allocable to Common Units	$	37.5	$	60.4
	Weighted-average Common Units outstanding	18.5		18.5
	Net earnings per Common Unit	$	2.03	$	3.26

Inventories_Tables

Inventories (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Schedule of inventories	Inventories consisted of the following:
		March 31,		December 31,
		2015		2014
		(in millions)
	Finished goods	$	3.3	$	7.8
	Materials and supplies	2.7		1.8
	Total	$	6	$	9.6

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of the gross fair values of derivatives on balance sheet	The gross fair values of derivatives on our consolidated balance sheets are shown below. All balance sheet amounts from derivatives arise from natural gas derivatives that are not designated as hedging instruments. For additional information on derivative fair values, see Note 7—Fair Value Measurements.
		March 31,			December 31,
		2015			2014
		(in millions)
	Unrealized gains in other current assets	$	0.8		$	0.1
	Unrealized losses in other current liabilities	(1.2		)	(3.6		)
	Net unrealized derivative gains (losses)	$	(0.4	)	$	(3.5	)
Schedule of effects of derivatives in consolidated statements of operations	The effect of derivatives in our consolidated statements of operations is shown below. All amounts arise from natural gas derivatives that are not designated as hedging instruments and are recorded in cost of goods sold.
		Three months ended
		March 31,
		2015			2014
		(in millions)
	Unrealized mark-to-market gains (losses)	$	3.9		$	(4.0	)
	Realized (losses) gains	(4.6		)	9.9
	Net derivative (losses) gains	$	(0.7	)	$	5.9
Schedule of offsetting of derivative assets and liabilities	The following table presents amounts relevant to offsetting of our derivative assets and liabilities as of March 31, 2015 and December 31, 2014:
		Gross and net amounts			Gross amounts
		presented in			not offset in consolidated
		consolidated			balance sheets
		balance sheets(1)			Financial			Cash		Net
					instruments			collateral		amount
								received
								(pledged)
		(in millions)
	31-Mar-15
	Total derivative assets	$	0.8		$	1.2		$	—	$	(0.4	)
	Total derivative liabilities	1.2			1.2			—		—
	Net assets (liabilities)	$	(0.4	)	$	—		$	—	$	(0.4	)
	31-Dec-14
	Total derivative assets	$	0.1		$	3.6		$	—	$	(3.5	)
	Total derivative liabilities	3.6			3.6			—		—
	Net assets (liabilities)	$	(3.5	)	$	—		$	—	$	(3.5	)
	_______________________________________________________________________________
	(1)	We report the fair values of our derivative assets and liabilities on a gross basis on our consolidated balance sheets. As a result, amounts recognized and net amounts presented are the same.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities that are recognized at fair value on a recurring basis	The following table presents assets and liabilities included in our consolidated balance sheets that are recognized at fair value on a recurring basis, and indicates the fair value hierarchy utilized to determine such fair value as of March 31, 2015 and December 31, 2014.
		Balances as of March 31, 2015
		Total			Quoted		Significant			Significant
					Market Prices		Other			Unobservable
					in Active		Observable			Inputs
					Markets		Inputs			(Level 3)
					(Level 1)		(Level 2)
		(in millions)
	Cash and cash equivalents	$	60		$	60	$	—		$	—
	Unrealized gains on natural gas derivatives	0.8			—		0.8			—
	Total assets at fair value	$	60.8		$	60	$	0.8		$	—
	Unrealized losses on natural gas derivatives	$	(1.2	)	$	—	$	(1.2	)	$	—
	Total liabilities at fair value	$	(1.2	)	$	—	$	(1.2	)	$	—
		Balances as of December 31, 2014
		Total			Quoted		Significant			Significant
					Market Prices		Other			Unobservable
					in Active		Observable			Inputs
					Markets		Inputs			(Level 3)
					(Level 1)		(Level 2)
		(in millions)
	Cash and cash equivalents	$	113		$	113	$	—		$	—
	Unrealized gains on natural gas derivatives	0.1			—		0.1			—
	Total assets at fair value	$	113.1		$	113	$	0.1		$	—
	Unrealized losses on natural gas derivatives	$	(3.6	)	$	—	$	(3.6	)	$	—
	Total liabilities at fair value	$	(3.6	)	$	—	$	(3.6	)	$	—

Property_Plant_and_Equipment_n1

Property, Plant and Equipment, net (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Schedule of property, plant and equipment, net	Property, plant and equipment, net consisted of the following:
		March 31,			December 31,
		2015			2014
		(in millions)
	Land	$	1.6		$	1.6
	Buildings and improvements	8.1			8.1
	Machinery and equipment	430.7			401.4
	Construction in progress	131.4			109.2
		571.8			520.3
	Less: Accumulated depreciation and amortization	259.5			260.9
		$	312.3		$	259.4
Summary of plant turnaround activity	The following is a summary of plant turnaround activity:
		Three months ended
		March 31,
		2015			2014
		(in millions)
	Net capitalized turnaround costs:
	Beginning balance	$	16.7		$	22.7
	Additions	29.4			0.3
	Depreciation	(1.6		)	(1.6		)
	Ending balance	$	44.5		$	21.4

Background_and_Basis_of_Presen1

Background and Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Common Units
Common units and interest in the partnership
Common units issued	18,501,576	18,501,576
Class B Common Units
Common units and interest in the partnership
Common units issued	184,072	184,072
General Partner
Common units and interest in the partnership
Ownership interest in the partnership (as a percent)	0.05%
CF Industries | Common Units
Common units and interest in the partnership
Common units owned through subsidiaries	13,889,014
Percentage of outstanding units owned through subsidiaries	75.00%

Agreement_of_Limited_Partnersh2

Agreement of Limited Partnership (Details) (USD $)	3 Months Ended		0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	6-May-15
Agreement of limited partnership
Declared partnership distributions	$76.10	$61.10
Cash partnership distributions paid	$76.10	$61.10
Available cash received from operating partnership (as a percent)	99.00%
Number of average trading days' closing prices used to determine the purchase price of outstanding units of non-affiliates	20 days
Number of days before the purchase announcement is made, as a basis for determining the purchase price of outstanding units of non-affiliates	5 days
Minimum
Agreement of limited partnership
Percentage of ownership of non-affiliates of the General Partner allowing majority owner to acquire outstanding units held by non-affiliated persons	25.00%
Notice period for making decision to purchase the outstanding units	30 days
Maximum
Agreement of limited partnership
Notice period for making decision to purchase the outstanding units	60 days
Minimum Quarterly Distributions
Agreement of limited partnership
Target Limit	0.605
Target Increment	0.605
Income and distribution allocation (as a percent)	100.00%
First Target
Agreement of limited partnership
Target Limit	0.715
Target Increment	0.11
Income and distribution allocation (as a percent)	100.00%
Second Target
Agreement of limited partnership
Target Limit	0.825
Target Increment	0.11
Income and distribution allocation (as a percent)	100.00%
Third Target
Agreement of limited partnership
Target Limit	1.045
Target Increment	0.22
Income and distribution allocation (as a percent)	100.00%
Final Target and Beyond
Agreement of limited partnership
Income and distribution allocation (as a percent)	100.00%
Final Target and Beyond | Minimum
Agreement of limited partnership
Target Limit	1.045
Common and Class B Common Units
Agreement of limited partnership
Cash distribution made, excluding when cumulative distribution is specified, (as a percent)	99.98%
Common Units | Minimum Quarterly Distributions
Agreement of limited partnership
Income and distribution allocation (as a percent)	98.99%
Common Units | First Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	98.99%
Common Units | Second Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	85.86%
Common Units | Third Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	75.76%
Common Units | Final Target and Beyond
Agreement of limited partnership
Income and distribution allocation (as a percent)	50.51%
Class B Common Units | Minimum Quarterly Distributions
Agreement of limited partnership
Income and distribution allocation (as a percent)	0.99%
Class B Common Units | First Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	0.99%
Class B Common Units | Second Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	0.99%
Class B Common Units | Third Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	0.99%
Class B Common Units | Final Target and Beyond
Agreement of limited partnership
Income and distribution allocation (as a percent)	0.99%
General Partner
Agreement of limited partnership
Available cash distributed from operating partnership to General Partner (as a percent)	1.00%
Cash distribution made, excluding when cumulative distribution is specified, (as a percent)	0.03%
Partnership equity interest (as a percent)	1.00%
Percentage of outstanding units owned by the General Partner and its affiliates	75.30%
Period within which highest price is paid for any unit preceding the date the purchase is announced used to determine the purchase price of outstanding units of non-affiliates	90 days
General Partner | Minimum Quarterly Distributions
Agreement of limited partnership
Income and distribution allocation (as a percent)	0.03%
General Partner | First Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	0.03%
General Partner | Second Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	13.16%
General Partner | Third Target
Agreement of limited partnership
Income and distribution allocation (as a percent)	23.26%
General Partner | Final Target and Beyond
Agreement of limited partnership
Income and distribution allocation (as a percent)	48.51%
Subsequent Event
Agreement of limited partnership
Cash distribution declared per common limited partnership unit (in dollars per unit)			$2.08

Net_Earnings_per_Common_Unit_D

Net Earnings per Common Unit (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Unit [Abstract]
Net earnings	$59	$102.90
Weighted-average Common Units outstanding	18,500,000	18,500,000
Net earnings per Common Unit (in dollars per unit)	$2.03	$3.26
Dilutive TNCLP units outstanding	0	0
General Partner
Earnings Per Unit [Abstract]
Net earnings	20.9	41.5
Net earnings per limited partner common unit
Less: Net earnings allocable to General Partner	20.9	41.5
Common Units | Class B Common Units
Earnings Per Unit [Abstract]
Net earnings	0.6	1
Net earnings per limited partner common unit
Net earnings allocated	0.6	1
Common Units | Common Units
Earnings Per Unit [Abstract]
Net earnings	37.5	60.4
Net earnings per limited partner common unit
Net earnings allocated	$37.50	$60.40

Inventories_Details

Inventories (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Inventory Disclosure [Abstract]
Finished goods	$3.30	$7.80
Materials and supplies	2.7	1.8
Total	$6	$9.60

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	MMBTU		MMBTU
Derivative financial instruments
Unrealized mark-to-market gains (losses)	$3,100,000	($2,900,000)
Open derivative contracts for natural gas (in MMBtus)	12,600,000		7,600,000
Percentage of natural gas consumption covered by derivatives	100.00%
Aggregate fair value of the derivative instruments with credit-risk-related contingent features in net liability position	1,200,000		3,600,000
Cash Collateral for Borrowed Securities	0		0
Total derivative assets
Gross and net amounts presented in consolidated balance sheet	800,000		100,000
Gross amounts not offset in consolidated balance sheet
Financial instruments	1,200,000		3,600,000
Cash collateral received	0		0
Net amount	-400,000		-3,500,000
Total derivative liabilities
Gross and net amounts presented in consolidated balance sheet	1,200,000		3,600,000
Gross amounts not offset in consolidated balance sheet
Financial instruments	1,200,000		3,600,000
Cash collateral pledged	0		0
Net amount	0		0
Net assets (liabilities)
Gross and net amounts presented in consolidated balance sheet	-400,000		-3,500,000
Natural gas derivatives not designated as hedging instruments
Derivative financial instruments
Unrealized gains in other current assets	800,000		100,000
Unrealized losses in other current liabilities	-1,200,000		-3,600,000
Net unrealized derivative gains (losses)	-400,000		-3,500,000
Unrealized mark-to-market gains (losses)	3,900,000	-4,000,000
Realized (losses) gains	-4,600,000	9,900,000
Net derivative (losses) gains	($700,000)	$5,900,000

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (Recurring basis, USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Quoted Market Prices in Active Markets (Level 1)
Fair value measurements
Cash and cash equivalents	$60	$113
Unrealized gains on natural gas derivatives	0
Total assets at fair value	60	113
Significant Other Observable Inputs (Level 2)
Fair value measurements
Unrealized gains on natural gas derivatives	0.8	0.1
Total assets at fair value	0.8	0.1
Unrealized losses on natural gas derivatives	-1.2	-3.6
Total liabilities at fair value	-1.2	-3.6
Total
Fair value measurements
Cash and cash equivalents	60	113
Unrealized gains on natural gas derivatives	0.8	0.1
Total assets at fair value	60.8	113.1
Unrealized losses on natural gas derivatives	-1.2	-3.6
Total liabilities at fair value	($1.20)	($3.60)

Property_Plant_and_Equipment_n2

Property, Plant and Equipment, net (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Property, plant and equipment, net
Gross property, plant and equipment	$571.80		$520.30
Less: Accumulated depreciation and amortization	259.5		260.9
Net property, plant and equipment	312.3		259.4
Loss on disposal of property, plant and equipment	1	0
Net capitalized turnaround costs:
Beginning balance	16.7	22.7
Additions	29.4	0.3
Depreciation	-1.6	-1.6
Ending balance	44.5	21.4
Land
Property, plant and equipment, net
Gross property, plant and equipment	1.6		1.6
Buildings and improvements
Property, plant and equipment, net
Gross property, plant and equipment	8.1		8.1
Machinery and equipment
Property, plant and equipment, net
Gross property, plant and equipment	430.7		401.4
Construction in progress
Property, plant and equipment, net
Gross property, plant and equipment	$131.40		$109.20

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Affiliate of General Partner
Related party transactions
Payroll, payroll-related expenses and other employee related benefits	$7,600,000	$5,600,000
Due From (To) Affiliates, Net	16,800,000		21,000,000
Services and Offtake Agreement | Affiliate of General Partner
Related party transactions
Extended term of agreement	1 year
Services and Offtake Agreement | CF Industries
Related party transactions
Allocated expenses	3,900,000	3,900,000
Lease Agreements | Affiliate of General Partner
Related party transactions
Rental income received	100,000	100,000
Lease Agreements | Affiliate of General Partner | Ammonia assets
Related party transactions
Term of agreement	5 years
Related Party Transaction Number of Extensions Possible in Agreement Term	3
Base quarterly rent of leased asset	$100,000
Lease Agreements | Affiliate of General Partner | Rail cars
Related party transactions
Extended term of agreement	1 year
Term of agreement	1 year
Quarterly rent per leased asset (in dollars per car)	3,600