10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

FORM 10-Q

(Mark One)

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2018

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______________ to _______________

Commission file number: 01-32665

BOARDWALK PIPELINE PARTNERS, LP

(Exact name of registrant as specified in its charter)

DELAWARE

(State or other jurisdiction of incorporation or organization)

20-3265614

(I.R.S. Employer Identification No.)

9 Greenway Plaza, Suite 2800

Houston, Texas  77046

(866) 913-2122

(Address and Telephone Number of Registrant’s Principal Executive Office)

Securities registered pursuant to Section 12(b) of the Act: NONE

Securities registered pursuant to Section 12(g) of the Act:  NONE

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes ý    No o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes ý    No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one)

Large accelerated filer ý Accelerated filer o Non-accelerated filer o Smaller reporting company o

Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Yes o No o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ¨ No ý

Boardwalk Pipeline Partners, LP meets the conditions set forth in General Instructions H(1) (a) and (b) of Form 10-Q and is therefore filing this form with the reduced disclosure format.

TABLE OF CONTENTS

FORM 10-Q

September 30, 2018

BOARDWALK PIPELINE PARTNERS, LP

PART I - FINANCIAL INFORMATION
Item 1. Financial Statements
Condensed Consolidated Balance Sheets	3
Condensed Consolidated Statements of Income	5
Condensed Consolidated Statements of Comprehensive Income	6
Condensed Consolidated Statements of Cash Flows	7
Condensed Consolidated Statements of Changes in Partners' Capital	8
Notes to Condensed Consolidated Financial Statements	9
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	32
Item 3. Quantitative and Qualitative Disclosures About Market Risk	36
Item 4. Controls and Procedures	36
PART II - OTHER INFORMATION
Item 1. Legal Proceedings	37
Item 1A. Risk Factors	37
Item 6. Exhibits	38
Signatures	39

2

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED BALANCE SHEETS

(Millions)

(Unaudited)

ASSETS	September 30, 2018		December 31,  2017
Current Assets:
Cash and cash equivalents	$	27.0	$	17.6
Receivables:
Trade, net	89.4		116.8
Other	32.9		16.6
Gas transportation receivables	8.3		4.6
Costs recoverable from customers	11.1		—
Prepayments	25.9		17.9
Other current assets	0.9		7.1
Total current assets	195.5		180.6
Property, Plant and Equipment:
Natural gas transmission and other plant	10,952.6		10,467.1
Construction work in progress	258.9		416.5
Property, plant and equipment, gross	11,211.5		10,883.6
Less—accumulated depreciation and amortization	2,863.3		2,621.1
Property, plant and equipment, net	8,348.2		8,262.5
Other Assets:
Goodwill	237.4		237.4
Gas stored underground	81.7		86.3
Other	138.5		139.8
Total other assets	457.6		463.5
Total Assets	$	9,001.3	$	8,906.6

The accompanying notes are an integral part of these condensed consolidated financial statements.

3

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED BALANCE SHEETS

(Millions)

(Unaudited)

LIABILITIES AND PARTNERS' CAPITAL	September 30, 2018			December 31,  2017
Current Liabilities:
Payables:
Trade	$	65.4		$	76.0
Affiliates	1.6			1.5
Other	18.3			11.9
Gas payables	8.2			5.7
Accrued taxes, other	76.4			57.1
Accrued interest	36.6			37.9
Accrued payroll and employee benefits	27.9			33.7
Construction retainage	17.6			32.4
Deferred income	0.9			1.9
Other current liabilities	19.9			22.3
Total current liabilities	272.8			280.4
Long-term debt and capital lease obligation	3,675.2			3,686.8
Other Liabilities and Deferred Credits:
Pension liability	19.0			21.8
Asset retirement obligation	57.1			46.0
Provision for other asset retirement	70.2			65.8
Payable to affiliate	—			16.0
Other	76.0			65.0
Total other liabilities and deferred credits	222.3			214.6
Commitments and Contingencies
Partners’ Capital:
Common units - 250.3 million units issued and outstanding     December 31, 2017	—			4,713.1
General partner	—			92.7
Partners' capital	4,909.6			—
Accumulated other comprehensive loss	(78.6		)	(81.0		)
Total partners’ capital	4,831.0			4,724.8
Total Liabilities and Partners' Capital	$	9,001.3		$	8,906.6

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Millions)

(Unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2018			2017			2018			2017
Operating Revenues:
Transportation	$	245.8		$	266.4		$	792.8		$	852.0
Storage, parking and lending	21.1			23.2			67.8			79.8
Other	11.0			10.9			38.0			53.3
Total operating revenues	277.9			300.5			898.6			985.1
Operating Costs and Expenses:
Fuel and transportation	3.5			9.0			12.0			42.7
Operation and maintenance	46.9			49.0			144.2			141.0
Administrative and general	32.8			27.1			100.6			96.9
Depreciation and amortization	88.9			80.6			256.6			241.4
(Gain) loss on sale of assets and impairments	(0.2		)	—			(0.7		)	47.1
Taxes other than income taxes	25.2			24.8			78.7			75.0
Total operating costs and expenses	197.1			190.5			591.4			644.1
Operating income	80.8			110.0			307.2			341.0
Other Deductions (Income):
Interest expense	43.5			41.0			130.9			131.1
Interest income	—			—			(0.1		)	(0.3		)
Miscellaneous other income, net	(0.7		)	(1.1		)	(1.3		)	(3.5		)
Total other deductions	42.8			39.9			129.5			127.3
Income before income taxes	38.0			70.1			177.7			213.7
Income taxes	0.1			0.3			0.4			0.9
Net income	$	37.9		$	69.8		$	177.3		$	212.8

The accompanying notes are an integral part of these condensed consolidated financial statements.

5

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Millions)

(Unaudited)

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2018			2017		2018		2017
Net income	$	37.9		$	69.8	$	177.3	$	212.8
Other comprehensive income (loss):
Loss on cash flow hedge	—			—		—		(1.5		)
Reclassification adjustment transferred to Net income from cash flow hedges	0.2			0.6		1.0		1.9
Pension and other postretirement benefit costs	(0.1		)	0.1		1.4		0.8
Total Comprehensive Income	$	38.0		$	70.5	$	179.7	$	214.0

The accompanying notes are an integral part of these condensed consolidated financial statements.

6

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Millions)

(Unaudited)

	For the Nine Months Ended September 30,
OPERATING ACTIVITIES:	2018			2017
Net income	$	177.3		$	212.8
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	256.6			241.4
Amortization of deferred costs and other	8.8			4.9
(Gain) loss on sale of assets and impairments	(0.7		)	47.1
Changes in operating assets and liabilities:
Trade and other receivables	10.9			31.2
Gas receivables and storage assets	0.6			(1.3		)
Costs recoverable from customers	(11.1		)	3.0
Other assets	(7.9		)	(4.4		)
Trade and other payables	2.6			(22.0		)
Gas payables	1.2			(5.4		)
Accrued liabilities	16.0			9.5
Other liabilities	1.0			(13.6		)
Net cash provided by operating activities	455.3			503.2
INVESTING ACTIVITIES:
Capital expenditures	(354.8		)	(496.0		)
Proceeds from sale of operating assets	0.9			63.7
Net cash used in investing activities	(353.9		)	(432.3		)
FINANCING ACTIVITIES:
Proceeds from long-term debt, net of issuance cost	—			494.0
Repayment of borrowings from long-term debt	(185.0		)	(575.0		)
Proceeds from borrowings on revolving credit agreement	525.0			505.0
Repayment of borrowings on revolving credit agreement	(355.0		)	(400.0		)
Principal payment of capital lease obligation	(0.4		)	(0.3		)
Advances from affiliates	0.1			0.1
Distributions paid	(76.7		)	(76.7		)
Net cash used in financing activities	(92.0		)	(52.9		)
Increase in cash and cash equivalents	9.4			18.0
Cash and cash equivalents at beginning of period	17.6			4.6
Cash and cash equivalents at end of period	$	27.0		$	22.6

The accompanying notes are an integral part of these condensed consolidated financial statements.

7

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL

(Millions)

(Unaudited)

	Common Units			General Partner			Partners' Capital			Accumulated Other Comp Income (Loss)			Total  Partners' Capital
Balance December 31, 2016	$	4,522.2		$	88.8		$	—		$	(80.1	)	$	4,530.9
Add (deduct):
Net income	208.6			4.2			—			—			212.8
Distributions paid	(75.2		)	(1.5		)	—			—			(76.7		)
Other comprehensive    income, net of tax	—			—			—			1.2			1.2
Balance September 30, 2017	$	4,655.6		$	91.5		$	—		$	(78.9	)	$	4,668.2
Balance December 31, 2017	$	4,713.1		$	92.7		$	—		$	(81.0	)	$	4,724.8
Add (deduct):
Cumulative effect adjustment from the implementation of ASC 606	(12.6		)	(0.2		)	—			—			(12.8		)
Adjustment related to registration rights agreement	16.0			—			—			—			16.0
Net income	136.6			2.8			37.9			—			177.3
Distributions paid	(50.1		)	(1.0		)	(25.6		)	—			(76.7		)
Other comprehensive    income, net of tax	—			—			—			2.4			2.4
General Partner purchase of common units and conversion to partnership interests	(4,803.0		)	(94.3		)	4,897.3			—			—
Balance September 30, 2018	$	—		$	—		$	4,909.6		$	(78.6	)	$	4,831.0

The accompanying notes are an integral part of these condensed consolidated financial statements.

8

BOARDWALK PIPELINE PARTNERS, LP

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1:  Basis of Presentation

Boardwalk Pipeline Partners, LP (the Partnership) is a Delaware limited partnership formed in 2005 to own and operate the business conducted by its primary subsidiary Boardwalk Pipelines, LP (Boardwalk Pipelines) and its operating subsidiaries, which consists of integrated natural gas and natural gas liquids and other hydrocarbons (herein referred to together as NGLs) pipeline and storage systems.

On June 29, 2018, Boardwalk GP, LP (Boardwalk GP) announced that it elected to exercise its right pursuant to Section 15.1(b) of the Partnership’s Third Amended and Restated Agreement of Limited Partnership, as amended (the Limited Partnership Agreement) to purchase all of the issued and outstanding common units representing limited partner interests in the Partnership (Common Units) not already owned by Boardwalk GP or its affiliates (Transaction Units) for a cash purchase price, determined in accordance with the Limited Partnership Agreement, of $12.06 per unit, or approximately $1.5 billion in the aggregate (Purchase Right). On July 18, 2018, Boardwalk GP purchased the Transaction Units. As a result of this transaction, the Partnership filed a Form 25 with the Securities and Exchange Commission (SEC) to voluntarily withdraw the Common Units from listing on the New York Stock Exchange (NYSE) and from registration under Section 12(b) of the Securities Exchange Act of 1934 and also deregistered all of its Common Units and related equity-like securities which were authorized for sale under its effective registration statements. Subsequently, the Limited Partnership Agreement was amended which converted the Partnership's Common Units to common unit equivalents in the form of partnership interests. The Partnership’s Common Units were traded on the NYSE through July 17, 2018, under the symbol “BWP”. As of September 30, 2018, Boardwalk Pipelines Holding Corp. (BPHC), a wholly-owned subsidiary of Loews Corporation (Loews), owned directly or indirectly, 100% of the Partnership’s capital.

The accompanying unaudited condensed consolidated financial statements of the Partnership were prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting of only normal recurring accruals) necessary to present fairly the Partnership's financial position as of September 30, 2018, and December 31, 2017, and its results of operations and comprehensive income for the three and nine months ended September 30, 2018 and 2017, and changes in cash flows and changes in partners' capital for the nine months ended September 30, 2018 and 2017. Reference is made to the Notes to the Consolidated Financial Statements in the Partnership's Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report on Form 10-K), which should be read in conjunction with these unaudited condensed consolidated financial statements. The accounting policies described in Note 2 of Part II, Item 8 of the Partnership's 2017 Annual Report on Form 10-K are the same used in preparing the accompanying unaudited condensed consolidated financial statements, except for the changes described in Note 2 below.

Certain amounts reported within Total operating revenues for the 2017 period have been reclassified to conform to the current presentation as a result of changes in accounting policies from the implementation of Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers, which was codified in Accounting Standards Codification (ASC) Topic 606 (ASC 606) further described below. The effect of the reclassification decreased Transportation revenues and increased Other revenues by $6.5 million and $18.2 million for the three and nine months ended September 30, 2017. Additionally, Storage, parking and lending (PAL) revenues are now reported combined. These reclassifications and combinations had no impact on Total operating revenues, Operating income or Net income. Net income for interim periods may not necessarily be indicative of results for the full year.

Note 2: Accounting Policies

Accounting Pronouncements Adopted in 2018 - Revenue Recognition

In May 2014, the Financial Accounting Standards Board (FASB) issued ASC 606. ASC 606 supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition (ASC 605), and requires the recognition of revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services.

9

Effective January 1, 2018, the Partnership implemented ASC 606 using the modified retrospective method, without adjustment to the comparative period information, which remains reported under ASC 605. Upon implementation, the Partnership recorded a cumulative reduction to partners’ capital of $12.8 million resulting from two items: (i) contracts which had changes to rates during the service period without corresponding changes in service levels provided by the Partnership, with an offsetting increase to other liabilities of $6.4 million, and (ii) the de-recognition of excess fuel received from customers which elected to have fuel retained in-kind, with an offsetting decrease to current gas stored underground of $6.4 million. Upon the implementation of ASC 606, most retained fuel was not considered additional consideration included in the transaction price. As a result, retained fuel is recorded as a reduction to fuel and transportation expense and will be recognized as Other revenue upon the physical sale of natural gas, when under ASC 605, fuel retained was recognized as part of Transportation revenue. The Partnership elected to apply ASC 606 to contracts with customers, and applicable amendments, which were not completed prior to the implementation date.

The following table summarizes the effect on the Partnership’s condensed consolidated financial statements as of September 30, 2018, and for the three and nine months ended September 30, 2018, (in millions) had ASC 606 not been implemented on January 1, 2018:

	As Reported September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Balance Sheet:
Other current assets (gas stored underground)	$	0.4	$	4.0		$	4.4
Gas stored underground	81.7		0.3			82.0
Other assets	138.5		(0.1		)	138.4
Other liabilities	76.0		(8.1		)	67.9
Partners' Capital	4,831.0		12.2			4,843.2

	As Reported For the Three Months Ended September 30, 2018		Adjustments		Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	245.8	$	5.5	$	251.3
Storage, parking and lending	21.1		0.1		21.2
Other	11.0		0.1		11.1
Total operating revenues	277.9		5.7		283.6
Fuel and transportation expense	3.5		4.6		8.1
Operating income	80.8		1.0		81.8
Net income	37.9		1.0		38.9

	As Reported For the Nine Months Ended September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	792.8	$	17.5		$	810.3
Storage, parking and lending	67.8		0.3			68.1
Other	38.0		(4.5		)	33.5
Total operating revenues	898.6		13.3			911.9
Fuel and transportation expense	12.0		13.8			25.8
Operating income	307.2		(0.6		)	306.6
Net income	177.3		(0.6		)	176.7

10

The implementation of ASC 606 had no impact on the total operating, financing or investing activities of the Partnership’s Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2018.

Revenue Recognition

Nature of Contracts

The Partnership primarily earns revenues from contracts with customers by providing transportation and storage services for natural gas and NGLs on a firm and interruptible basis. The Partnership also provides interruptible natural gas PAL services. The Partnership’s customers choose, based upon their particular needs, the applicable mix of services depending upon availability of pipeline and storage capacity, the price of services and the volume and timing of customer requirements. The maximum rates that may be charged by the majority of the Partnership’s operating subsidiaries are established through the Federal Energy Regulatory Commission's (FERC) cost-based rate-making process; however, rates actually charged by those operating subsidiaries may be less than those allowed by the FERC. Under the FERC regulations, certain revenues that the Partnership's subsidiaries collect may be subject to possible refunds to customers. Accordingly, during a rate case, estimated refund liabilities are recorded considering regulatory proceedings, advice of counsel and estimated risk-adjusted total exposure, as well as other factors. The Partnership's service contracts can range from one to twenty years although the Partnership may enter into shorter- or longer-term contracts, and services are invoiced monthly with payment from the customer generally expected within ten to thirty days, depending on the terms of the contract.

Firm Service Contracts: The Partnership offers firm services to its customers. The Partnership’s customers can reserve a specific amount of pipeline capacity at specified receipt and delivery points on the Partnership’s pipeline system (transportation service) or can reserve a specific amount of storage capacity at specified injection and withdrawal points at the Partnership’s storage facilities (storage service). The Partnership accounts for firm services as a single promise to stand ready each month of the contract term to provide the committed capacity for either transportation or storage services when needed by the customer, which represents a series of distinct monthly services that are substantially the same with the same pattern of transfer to the customer. Although several activities may be required to provide the firm service, the individual activities do not represent distinct performance obligations because all of the activities must be performed in combination in order for the Partnership to provide the firm service.

The transaction price for firm service contracts is comprised of a fixed fee based on the quantity of capacity reserved, regardless of use (capacity reservation fee), plus variable fees in the form of a usage fee paid on the volume of commodity actually transported or injected and withdrawn from storage. Both the fixed and usage fees are allocated to the single performance obligation of providing transportation or storage service and recognized over time based upon the output measure of time as the Partnership completes its stand-ready obligation to provide contracted capacity and the customer receives and consumes the benefit of the reserved capacity, which corresponds with the transfer of control to the customer. The fixed fee is recognized ratably over the contract term, representative of the proportion of the committed stand-ready capacity obligation that has been fulfilled to date, and the usage fee is recognized upon satisfaction of each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the stand-ready obligation in a given month. Capacity reservation revenues derived from a firm service contract are generally consistent during the contract term, but can be higher in winter periods than the rest of the year based upon seasonal rates.

Interruptible Service Contracts: In providing interruptible services to customers, the Partnership agrees to transport natural gas or NGLs for a customer when capacity is available. The Partnership does not account for interruptible services with a customer as a contract until the customer nominates for service and the Partnership accepts the nomination based upon available pipeline or storage capacity because there are no enforceable rights and obligations until that time. The nomination and acceptance process is a daily activity and acceptance is granted based upon priority of service and availability of capacity. Upon acceptance, the Partnership accounts for interruptible services similarly to its firm services.

The transaction price for interruptible service contracts is comprised of a variable fee in the form of a usage fee paid on the volume of commodity actually transported or injected and withdrawn from storage. The usage fee is allocated to the single performance obligation of providing interruptible service. Interruptible service revenues are generally recognized over time based on the output measure of volume transported or stored when services are rendered upon the successful allocation of the services provided to the customer’s account, which best depicts the transfer of control to the customer and satisfaction of the promised service. Interruptible services are recognized in the month services are provided because the Partnership has a right to consideration from customers in amounts that correspond directly to the value that the customer receives from the Partnership's performance. The rates charged may vary on a daily, monthly or seasonal basis.

11

Minimum Volume Commitment (MVC) Contracts: Certain of the Partnership’s transportation or storage contracts require customers to transport or store a minimum volume of commodity over a specified time period. If a customer fails to meet its MVC for the specified time period, the customer is obligated to pay a contractually-determined deficiency fee based upon the shortfall between the actual volumes transported or stored and the MVC for that period. MVC contracts are similar in nature to a firm service contract where the performance obligation is a stand-ready obligation that is a series of distinct services that are substantially the same with the same pattern of transfer to the customer. The transaction price for an MVC is a fee for the volume of commodity actually transported or stored, which is allocated to each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the obligation of the transacted service in a given month. Revenues are generally recognized over time based on the output measure of volume transported or stored, with the recognition of the deficiency fee in the period when it is known the customer cannot make up the deficient volume in the specified period.

Other: Periodically, the Partnership may enter into contracts with customers for the sale of natural gas or NGLs. The Partnership recognizes revenues for these transactions at the point in time of the physical sale of the commodity, which corresponds with the transfer of control of the commodity to the customer and the consideration is measured as the stated sales price in the contract.

Contract Balances

The Partnership records contract assets primarily related to performance obligations completed but not billed as of the reporting date. The Partnership records contract liabilities, or deferred income, when payment is received in advance of satisfying its performance obligations.

Accounting Pronouncements Adopted in 2018 - Retirement Benefits

In March 2017, the FASB issued ASU 2017-07, Retirement Benefits - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07), which required entities to retroactively present the service cost component of net periodic postretirement benefit cost with other employee compensation costs in the income statement and present all other net periodic pension costs as a component of non-operating income. Effective January 1, 2018, the Partnership implemented ASU 2017-07 and reclassified $0.8 million and $1.8 million of other components of net periodic benefit cost for the three and nine months ended September 30, 2017, which resulted in an increase to Miscellaneous other income, net and Administrative and general expense in the Condensed Consolidated Statements of Income, with no impact on Net income.

Other Recently Issued Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (ASU 2016-02), which will require, among other things, the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current GAAP. The amendments are to be applied at the beginning of the earliest period presented using a modified retrospective approach, but include an elective transition method that allows entities to initially apply the updated guidance as of the adoption date. The Partnership has elected to apply this elective transition method. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. The Partnership is progressing with its project to evaluate the impact that ASU 2016-02 will have on its financial statements when implemented. ASU 2016-02 contains a practical expedient package, under which all criteria must be applied to all of its leases. The practical expedient package allows an entity to (i) not reassess whether expired or existing contracts are or contain leases; (ii) not reassess the lease classification for any expired or existing leases; and (iii) not reassess initial direct costs for any existing leases. The Partnership has elected to apply the practical expedient package to all of its leases.

Note 3: Revenues

The Partnership operates in one reportable segment and contracts directly with producers of natural gas and with end-use customers, including local distribution companies, marketers, electric power generators, industrial users and interstate and intrastate pipelines, who, in turn, provide transportation and storage services for end-users. The following table presents the Partnership's revenues disaggregated by type of service for the three and nine months ended September 30, 2018 (in millions):

12

	For the Three Months Ended September 30, 2018		For the Nine Months Ended September 30, 2018
Revenues from Contracts with Customers
Firm Service (1)	$	264.5	$	850.9
Interruptible Service	7.7		25.0
Other revenues	1.2		9.7
Total revenues from contracts with customers	273.4		885.6
Other operating revenues(2)	4.5		13.0
Total Operating Revenues	$	277.9	$	898.6

(1) Revenues earned from contracts with MVCs are included in firm service given the stand-ready nature of the performance obligation and the guaranteed nature of the fees over the contract term.

(2) Other operating revenues include certain revenues earned from operating leases, pipeline management fees and other activities that are not considered central and ongoing major business operations of the Partnership and do not represent revenues earned from contracts with customers.

Contract Balances

As of September 30, 2018, the Partnership had receivables recorded in Trade Receivables, contract assets recorded in Other current assets, and contract liabilities recorded in Other liabilities, from contracts with customers of $89.4 million, $17.1 million and $9.1 million. The contract asset is a result of the Partnership recognizing revenue related to a stand-ready performance obligation for transportation and storage services which will be invoiced per the contractual terms of the agreement, but within the next nine months.

Contract liabilities are expected to be recognized through 2026. Significant changes in the contract liabilities balances during the nine months ended September 30, 2018, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2017	$	1.9
Cumulative effect adjustment from the implementation of     ASC 606	6.4
Revenues recognized that were included in the contract liability     balance at the beginning of the period	(2.3		)
Increases due to cash received, excluding amounts recognized as     revenues during the period	3.1
Balance as of September 30, 2018	$	9.1

13

Performance Obligations

The following table includes estimated operating revenues expected to be recognized in the future related to agreements that contain performance obligations that were unsatisfied as of September 30, 2018, as well as actual fixed fee revenues recognized for the fulfillment of performance obligations for the 2018 period for those same agreements. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, as in accordance with firm service contracts. Additionally, for the Partnership’s customers that are charged maximum tariff rates related to its FERC-regulated operating subsidiaries, the amounts below reflect the current tariff rate for such services for the term of the agreements; however, the tariff rates may be subject to future adjustment. The Partnership has elected to exclude the following from the table: (a) unsatisfied performance obligations from usage fees associated with its firm services because of the stand-ready nature of such services; (b) consideration in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) consideration that was received prior to September 30, 2018, that will be recognized in future periods, such as recorded in contract liabilities.    

	As of September 30, 2018 (in millions)
	2018 (1)		2019		Thereafter		Total
Estimated revenues from contracts with customers    from unsatisfied performance obligations as of    September 30, 2018	$	1,065.0	$	1,038.0	$	7,630.0	$	9,733.0
Operating revenues which are fixed and     determinable (operating leases)	13.5		18.0		230.5		262.0
Total projected operating revenues under committed     firm agreements	$	1,078.5	$	1,056.0	$	7,860.5	$	9,995.0

(1) For the 2018 period, $797.0 million represents actual fixed fee revenues recognized for the fulfillment of performance obligations during the nine months ended September 30, 2018.

Note 4: Asset Disposition and Impairments

In May 2017, the Partnership sold its Flag City Processing Partners, LLC subsidiary, which owned the Flag City processing plant and related assets, to a third party for $63.6 million, including customary adjustments. The Partnership recognized losses and impairment charges, reported within Total operating costs and expenses, of $47.1 million on the sale.

Note 5:  Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables

The operating subsidiaries of the Partnership provide storage services whereby they store natural gas or NGLs on behalf of customers and also periodically hold customer gas under PAL services. Since the customers retain title to the gas held by the Partnership in providing these services, the Partnership does not record the related gas on its balance sheet.

The operating subsidiaries of the Partnership also periodically lend gas to customers under PAL and certain firm services, and gas or NGLs may be owed to the operating subsidiaries as a result of transportation imbalances. As of September 30, 2018, the amount of gas owed to the operating subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 7.9 trillion British thermal units (TBtu). Assuming an average market price during September 2018 of $2.83 per million British thermal unit, the market value of that gas was approximately $22.4 million. As of September 30, 2018, the amount of NGLs owed to the Partnership's operating subsidiaries due to imbalances was less than 0.1 million barrels, which had a market value of approximately $1.1 million dollars. As of December 31, 2017, the amount of gas owed to the operating subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 12.3 TBtu. As of December 31, 2017, there were no outstanding NGL imbalances owed to the operating subsidiaries. If any significant customer should have credit or financial problems resulting in a delay or failure to repay the gas owed to the operating subsidiaries, it could have a material adverse effect on the Partnership’s financial condition, results of operations or cash flows.

14

Note 6: Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements

AOCI

The Partnership had no outstanding derivatives at September 30, 2018, and December 31, 2017, but had $4.0 million and $5.0 million of AOCI related to cash flow hedges as of September 30, 2018, and December 31, 2017, which relate to settled treasury rate locks that are being amortized to earnings over the terms of the related interest payments, generally the terms of the related debt. The Partnership estimates that approximately $0.9 million of net losses from cash flow hedges reported in AOCI as of September 30, 2018, are expected to be reclassified into earnings within the next twelve months.

Financial Assets and Liabilities

The following methods and assumptions were used in estimating the fair value amounts included in the disclosures for financial assets and liabilities, which are consistent with those disclosed in the 2017 Annual Report on Form 10-K:

Cash and Cash Equivalents: For cash and short-term financial assets, the carrying amount is a reasonable estimate of fair value due to the short maturity of those instruments.

Long-Term Debt: The estimated fair value of the Partnership's publicly traded debt is based on quoted market prices at September 30, 2018, and December 31, 2017. The fair market value of the debt that is not publicly traded is based on market prices of similar debt at September 30, 2018, and December 31, 2017. The carrying amount of the Partnership's variable-rate debt at September 30, 2018, and December 31, 2017, approximated fair value.

The carrying amounts and estimated fair values of the Partnership's financial assets and liabilities which were not recorded at fair value on the Condensed Consolidated Balance Sheets as of September 30, 2018, and December 31, 2017, were as follows (in millions):

As of September 30, 2018				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	27.0		$	27.0	$	—	$	—	$	27.0
Financial Liabilities
Long-term debt	$	3,675.1	(1)	$	—	$	3,731.1	$	—	$	3,731.1

(1) The carrying amount of long-term debt excludes a $7.6 million long-term capital lease obligation and

$7.5 million of unamortized debt issuance costs.

As of December 31, 2017				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.6		$	17.6	$	—	$	—	$	17.6
Financial Liabilities
Long-term debt	$	3,687.5	(1)	$	—	$	3,889.4	$	—	$	3,889.4

(1) The carrying amount of long-term debt excludes an $8.1 million long-term capital lease obligation and

$8.8 million of unamortized debt issuance costs.

15

Note 7:  Commitments and Contingencies

Legal Proceedings and Settlements

The Partnership's subsidiaries are parties to various legal actions arising in the normal course of business. Management believes the disposition of these outstanding legal actions will not have a material impact on the Partnership's financial condition, results of operations or cash flows.

Mishal and Berger Litigation

On May 25, 2018, plaintiffs Tsemach Mishal and Paul Berger (on behalf of themselves and the purported class, Plaintiffs) initiated a purported class action in the Court of Chancery of the State of Delaware (the Court) against the following defendants: the Partnership, Boardwalk GP, Boardwalk GP, LLC and BPHC (together, Defendants), regarding the potential exercise by Boardwalk GP of its Purchase Right.

On June 25, 2018, Plaintiffs and Defendants entered into a Stipulation and Agreement of Compromise and Settlement, subject to the approval of the Court (the Proposed Settlement). Under the terms of the Proposed Settlement, the lawsuit would be dismissed, and related claims against the Defendants would be released by the Plaintiffs, if BPHC, the sole member of the general partner of Boardwalk GP, elected to cause Boardwalk GP to exercise the Purchase Right and gave notice of such election as provided in the Limited Partnership Agreement within a period specified by the Proposed Settlement. On June 29, 2018, Boardwalk GP elected to exercise the Purchase Right and gave notice within the period specified by the Proposed Settlement. On July 18, 2018, Boardwalk GP completed the purchase of the Common Units pursuant to the Purchase Right as further described in Note 1.

On September 27, 2018, the Court denied approval of the Proposed Settlement. The Court has not set a schedule for further proceedings in the case.

Commitments for Construction

The Partnership’s future capital commitments are comprised of binding commitments under purchase orders for materials ordered but not received and firm commitments under binding construction service agreements. The commitments as of September 30, 2018, were approximately $162.5 million, all of which are expected to be settled within the next twelve months.

There were no substantial changes to the Partnership’s operating lease commitments, pipeline capacity agreements or capital lease obligation disclosed in Notes 4 and 10 of Part II, Item 8 of the Partnership’s 2017 Annual Report on Form 10-K.

Note 8:  Financing

Notes and Debentures

As of September 30, 2018, and December 31, 2017, the Partnership had notes and debentures outstanding of $3.1 billion and $3.3 billion with weighted-average interest rates of 5.17% and 5.18%. The indentures governing the notes and debentures have restrictive covenants which provide that, with certain exceptions, neither the Partnership nor any of its subsidiaries may create, assume or suffer to exist any lien upon any property to secure any indebtedness unless the debentures and notes shall be equally and ratably secured. All of the Partnership's debt obligations are unsecured. At September 30, 2018, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.

The Partnership has included $350.0 million of notes which mature in less than one year as long-term debt on its Condensed Consolidated Balance Sheet as of September 30, 2018. The Partnership has the intent and the ability to refinance the notes through the available borrowing capacity under its revolving credit facility as of September 30, 2018. The Partnership expects to retire these notes at their maturity.

16

Issuance of Notes

The Partnership had no debt issuances for the nine months ended September 30, 2018. During the nine months ended September 30, 2017, the Partnership completed the following debt issuance (in millions, except interest rates):

Date of Issuance	Issuing Subsidiary	Amount of  Issuance		Purchaser Discounts and Expenses		Net Proceeds			Interest Rate	Maturity Date	Interest Payable
January 2017	Boardwalk Pipelines	$	500.0	$	6.0	$	494.0	(1)	4.45%	July 15, 2027	January 15 and July 15

(1) The net proceeds of this offering were used to retire the outstanding $275.0 million aggregate principal amount of Gulf South Pipeline Company, LP's 6.30% notes due 2017 and to fund growth capital expenditures.

Redemption of Notes

On June 1, 2018, the Partnership retired the Boardwalk Pipelines $185.0 million 5.20% notes at maturity with borrowings under its revolving credit facility.

Revolving Credit Facility

Outstanding borrowings under the Partnership’s revolving credit facility as of September 30, 2018, and December 31, 2017, were $555.0 million and $385.0 million, with weighted-average borrowing rates of 3.42% and 2.72%. The Partnership and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of September 30, 2018. The revolving credit facility has a borrowing capacity of $1.5 billion through May 26, 2020, and a borrowing capacity of $1.475 billion from May 27, 2020, to May 26, 2022.

Subordinated Loan Agreement with Affiliate

The Partnership has in place a Subordinated Loan Agreement with BPHC (Subordinated Loan) under which the Partnership can borrow up to $300.0 million through December 31, 2018. Through the date of this Quarterly Report on Form 10-Q, the Partnership had no outstanding borrowings under the Subordinated Loan.

Registration Rights Agreement

The Partnership had previously entered into an Amended and Restated Registration Rights Agreement with BPHC under which the Partnership agreed to register the resale of up to 27.9 million Common Units by BPHC and to reimburse BPHC up to a maximum amount of $0.914 per Common Unit for underwriting discounts and commissions. As of December 31, 2017, the Partnership had a $16.0 million accrued liability for future underwriting discounts and commissions that would be reimbursed to BPHC. However, due to the purchase of the Transaction Units by Boardwalk GP described in Note 1, the $16.0 million liability was reversed in the second quarter 2018, with an offsetting adjustment to partners' capital.

17

Note 9:  Employee Benefits

Defined Benefit Retirement Plans and Postretirement Benefits Other Than Pension (PBOP)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended September 30, 2018 and 2017, were as follows (in millions):

	Retirement Plans						PBOP
	For the Three Months Ended September 30,						For the Three Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	0.7		$	0.8		$	—		$	—
Interest cost	1.2			1.2			0.4			0.4
Expected return on plan assets	(1.7		)	(2.0		)	(1.2		)	(1.1		)
Amortization of unrecognized net loss	0.3			0.4			—			—
Settlement charge	0.4			0.4			—			—
Net periodic benefit cost	$	0.9		$	0.8		$	(0.8	)	$	(0.7	)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2018 and 2017, were as follows (in millions):

	Retirement Plans						PBOP
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	2.5		$	2.6		$	0.1		$	0.1
Interest cost	3.4			3.5			1.1			1.2
Expected return on plan assets	(5.7		)	(5.9		)	(3.5		)	(3.3		)
Amortization of unrecognized net loss	1.1			1.3			—			—
Settlement charge	2.6			1.5			—			—
Net periodic benefit cost	$	3.9		$	3.0		$	(2.3	)	$	(2.0	)

The components of net periodic benefit cost, other than the service cost component, are included in Miscellaneous other income, net and the service cost component is included in Administrative and general on the Condensed Consolidated Statements of Income.    

The Partnership contributed $3.0 million to the defined benefit pension plan in the third quarter 2018.

Defined Contribution Plans

Texas Gas Transmission, LLC employees hired on or after November 1, 2006, and all other employees of the Partnership are provided retirement benefits under a defined contribution money purchase plan. The Partnership also provides 401(k) plan benefits to its employees. Costs related to the Partnership’s defined contribution plans were $2.7 million for the three months ended September 30, 2018 and 2017, and $8.0 million and $8.1 million for the nine months ended September 30, 2018 and 2017.

18

Note 10:  Related Party Transactions

Loews provides a variety of corporate services to the Partnership under service agreements, including but not limited to, information technology, tax, risk management, internal audit and corporate development services and also charges the Partnership for allocated overheads. The Partnership incurred charges related to these services of $1.6 million and $1.7 million for the three months ended September 30, 2018 and 2017, and $4.6 million and $5.0 million for the nine months ended September 30, 2018 and 2017.

As described in Note 1, Boardwalk GP purchased the Partnership’s outstanding Common Units not already owned by Boardwalk GP or its affiliates on July 18, 2018. As a result of this transaction, the Partnership became an indirect and direct wholly-owned subsidiary of BPHC as of July 18, 2018.

Distributions paid to BPHC and Boardwalk GP were $25.6 million and $13.1 million for the three months ended September 30, 2018 and 2017, and $51.7 million and $39.2 million for the nine months ended September 30, 2018 and 2017. The distribution was impacted by the increase in ownership by Boardwalk GP in the third quarter 2018 as described above and in Note 1.

Note 11:  Supplemental Disclosure of Cash Flow Information (in millions):

	For the Nine Months Ended September 30,
	2018		2017
Cash paid during the period for:
Interest (net of amount capitalized)	$	124.9	$	125.8
Non-cash adjustments:
Accounts payable and property, plant and equipment	51.9		66.6

Note 12: Guarantee of Securities of Subsidiaries

Boardwalk Pipelines (Subsidiary Issuer) has issued securities which have been fully and unconditionally guaranteed by the Partnership (Parent Guarantor). The Subsidiary Issuer is 100% owned by the Parent Guarantor. The Partnership's subsidiaries had no significant restrictions on their ability to pay distributions or make loans to the Partnership except as noted in the debt covenants and had no restricted assets at September 30, 2018, and December 31, 2017. Note 8 contains additional information regarding the Partnership's debt and related covenants.

The Partnership has provided the following condensed consolidating financial information in accordance with Regulation S-X Rule 3-10, Financial Statements of Guarantors and Issuers of Guaranteed Securities Registered or Being Registered.

19

Condensed Consolidating Balance Sheets as of September 30, 2018

(Millions)

Assets	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	0.2	$	15.6	$	11.2	$	—		$	27.0
Receivables	—		—		122.3		—			122.3
Receivables - affiliate	—		—		6.7		(6.7		)	—
Costs recoverable from customers	—		—		11.1		—			11.1
Prepayments	0.1		—		25.8		—			25.9
Advances to affiliates	—		15.3		2.1		(17.4		)	—
Other current assets	—		—		12.4		(3.2		)	9.2
Total current assets	0.3		30.9		191.6		(27.3		)	195.5
Investment in consolidated subsidiaries	2,790.0		6,653.9		—		(9,443.9		)	—
Property, plant and equipment, gross	0.6		—		11,210.9		—			11,211.5
Less–accumulated depreciation    and amortization	0.6		—		2,862.7		—			2,863.3
Property, plant and equipment, net	—		—		8,348.2		—			8,348.2
Advances to affiliates – noncurrent	2,042.4		864.1		410.7		(3,317.2		)	—
Other noncurrent assets	0.1		2.6		454.4		0.5			457.6
Total other assets	2,042.5		866.7		865.1		(3,316.7		)	457.6
Total Assets	$	4,832.8	$	7,551.5	$	9,404.9	$	(12,787.9	)	$	9,001.3

Liabilities and Partners' Capital	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.2	$	0.1	$	83.4	$	—		$	83.7
Payable to affiliates	1.6		—		6.7		(6.7		)	1.6
Advances from affiliates	—		2.1		15.3		(17.4		)	—
Other current liabilities	—		26.7		163.5		(2.7		)	187.5
Total current liabilities	1.8		28.9		268.9		(26.8		)	272.8
Long-term debt and capital lease     obligation	—		2,279.3		1,395.9		—			3,675.2
Advances from affiliates - noncurrent	—		2,453.1		864.1		(3,317.2		)	—
Other noncurrent liabilities	—		0.2		222.1		—			222.3
Total other liabilities and deferred     credits	—		2,453.3		1,086.2		(3,317.2		)	222.3
Total partners' capital	4,831.0		2,790.0		6,653.9		(9,443.9		)	4,831.0
Total Liabilities and Partners' Capital	$	4,832.8	$	7,551.5	$	9,404.9	$	(12,787.9	)	$	9,001.3

20

Condensed Consolidating Balance Sheets as of December 31, 2017

(Millions)

Assets	Parent  Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	0.3	$	4.6	$	12.7	$	—		$	17.6
Receivables	—		—		133.4		—			133.4
Receivables - affiliate	—		—		7.0		(7.0		)	—
Prepayments	0.1		—		17.8		—			17.9
Advances to affiliates	—		—		2.3		(2.3		)	—
Other current assets	—		—		13.5		(1.8		)	11.7
Total current assets	0.4		4.6		186.7		(11.1		)	180.6
Investment in consolidated subsidiaries	2,672.3		6,676.7		—		(9,349.0		)	—
Property, plant and equipment, gross	0.6		—		10,883.0		—			10,883.6
Less–accumulated depreciation    and amortization	0.6		—		2,620.5		—			2,621.1
Property, plant and equipment, net	—		—		8,262.5		—			8,262.5
Advances to affiliates – noncurrent	2,070.1		923.7		376.5		(3,370.3		)	—
Other noncurrent assets	—		3.3		460.5		(0.3		)	463.5
Total other assets	2,070.1		927.0		837.0		(3,370.6		)	463.5
Total Assets	$	4,742.8	$	7,608.3	$	9,286.2	$	(12,730.7	)	$	8,906.6

Liabilities and Partners' Capital	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.5	$	0.1	$	87.3	$	—		$	87.9
Payable to affiliates	1.5		—		7.0		(7.0		)	1.5
Advances from affiliates	—		2.3		—		(2.3		)	—
Other current liabilities	—		25.2		167.9		(2.1		)	191.0
Total current liabilities	2.0		27.6		262.2		(11.4		)	280.4
Long-term debt and capital lease     obligation	—		2,461.8		1,225.0		—			3,686.8
Payable to affiliate - noncurrent	16.0		—		—		—			16.0
Advances from affiliates - noncurrent	—		2,446.6		923.7		(3,370.3		)	—
Other noncurrent liabilities	—		—		198.6		—			198.6
Total other liabilities and deferred     credits	16.0		2,446.6		1,122.3		(3,370.3		)	214.6
Total partners' capital	4,724.8		2,672.3		6,676.7		(9,349.0		)	4,724.8
Total Liabilities and Partners' Capital	$	4,742.8	$	7,608.3	$	9,286.2	$	(12,730.7	)	$	8,906.6

21

Condensed Consolidating Statements of Income for the Three Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	266.5		$	(20.7	)	$	245.8
Storage, parking and lending	—			—			21.1			—			21.1
Other	—			—			11.0			—			11.0
Total operating revenues	—			—			298.6			(20.7		)	277.9
Operating Costs and Expenses:
Fuel and transportation	—			—			24.2			(20.7		)	3.5
Operation and maintenance	—			—			46.9			—			46.9
Administrative and general	(0.1		)	—			32.9			—			32.8
Other operating costs and expenses	0.1			—			113.8			—			113.9
Total operating costs and expenses	—			—			217.8			(20.7		)	197.1
Operating income	—			—			80.8			—			80.8
Other Deductions (Income):
Interest expense	—			29.2			14.3			—			43.5
Interest (income) expense - affiliates, net	(17.5		)	14.0			3.5			—			—
Equity in earnings of subsidiaries	(20.4		)	(63.6		)	—			84.0			—
Miscellaneous other income, net	—			—			(0.7		)	—			(0.7		)
Total other (income) deductions	(37.9		)	(20.4		)	17.1			84.0			42.8
Income (loss) before income taxes	37.9			20.4			63.7			(84.0		)	38.0
Income taxes	—			—			0.1			—			0.1
Net income (loss)	$	37.9		$	20.4		$	63.6		$	(84.0	)	$	37.9

22

Condensed Consolidating Statements of Income for the Three Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	288.9		$	(22.5	)	$	266.4
Storage, parking and lending	—			—			23.2			—			23.2
Other	—			—			10.9			—			10.9
Total operating revenues	—			—			323.0			(22.5		)	300.5
Operating Costs and Expenses:
Fuel and transportation	—			—			31.5			(22.5		)	9.0
Operation and maintenance	—			—			49.0			—			49.0
Administrative and general	(0.3		)	—			27.4			—			27.1
Other operating costs and expenses	0.4			—			105.0			—			105.4
Total operating costs and expenses	0.1			—			212.9			(22.5		)	190.5
Operating (loss) income	(0.1		)	—			110.1			—			110.0
Other Deductions (Income):
Interest expense	—			32.2			8.8			—			41.0
Interest (income) expense - affiliates, net	(12.4		)	11.0			1.4			—			—
Equity in earnings of subsidiaries	(57.5		)	(100.7		)	—			158.2			—
Miscellaneous other income, net	—			—			(1.1		)	—			(1.1		)
Total other (income) deductions	(69.9		)	(57.5		)	9.1			158.2			39.9
Income (loss) before income taxes	69.8			57.5			101.0			(158.2		)	70.1
Income taxes	—			—			0.3			—			0.3
Net income (loss)	$	69.8		$	57.5		$	100.7		$	(158.2	)	$	69.8

23

Condensed Consolidating Statements of Income for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	854.7		$	(61.9	)	$	792.8
Storage, parking and lending	—			—			68.1			(0.3		)	67.8
Other	—			—			38.0			—			38.0
Total operating revenues	—			—			960.8			(62.2		)	898.6
Operating Costs and Expenses:
Fuel and transportation	—			—			74.2			(62.2		)	12.0
Operation and maintenance	—			—			144.2			—			144.2
Administrative and general	(0.2		)	—			100.8			—			100.6
Other operating costs and expenses	0.3			—			334.3			—			334.6
Total operating costs and expenses	0.1			—			653.5			(62.2		)	591.4
Operating (loss) income	(0.1		)	—			307.3			—			307.2
Other Deductions (Income):
Interest expense	—			91.8			39.1			—			130.9
Interest (income) expense - affiliates, net	(49.3		)	38.1			11.2			—			—
Interest income	—			—			(0.1		)	—			(0.1		)
Equity in earnings of subsidiaries	(128.1		)	(258.0		)	—			386.1			—
Miscellaneous other income, net	—			—			(1.3		)	—			(1.3		)
Total other (income) deductions	(177.4		)	(128.1		)	48.9			386.1			129.5
Income (loss) before income taxes	177.3			128.1			258.4			(386.1		)	177.7
Income taxes	—			—			0.4			—			0.4
Net income (loss)	$	177.3		$	128.1		$	258.0		$	(386.1	)	$	177.3

24

Condensed Consolidating Statements of Income for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	918.3		$	(66.3	)	$	852.0
Storage, parking and lending	—			—			80.0			(0.2		)	79.8
Other	—			—			53.3			—			53.3
Total operating revenues	—			—			1,051.6			(66.5		)	985.1
Operating Costs and Expenses:
Fuel and transportation	—			—			109.2			(66.5		)	42.7
Operation and maintenance	—			—			141.0			—			141.0
Administrative and general	(0.3		)	—			97.2			—			96.9
Other operating costs and expenses	0.5			—			363.0			—			363.5
Total operating costs and expenses	0.2			—			710.4			(66.5		)	644.1
Operating (loss) income	(0.2		)	—			341.2			—			341.0
Other Deductions (Income):
Interest expense	—			97.6			33.5			—			131.1
Interest (income) expense - affiliates, net	(34.6		)	30.1			4.5			—			—
Interest income	—			(0.2		)	(0.1		)	—			(0.3		)
Equity in earnings of subsidiaries	(178.4		)	(305.9		)	—			484.3			—
Miscellaneous other income, net	—			—			(3.5		)	—			(3.5		)
Total other (income) deductions	(213.0		)	(178.4		)	34.4			484.3			127.3
Income (loss) before income taxes	212.8			178.4			306.8			(484.3		)	213.7
Income taxes	—			—			0.9			—			0.9
Net income (loss)	$	212.8		$	178.4		$	305.9		$	(484.3	)	$	212.8

25

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	37.9		$	20.4		$	63.6		$	(84.0	)	$	37.9
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	0.2			0.2			0.1			(0.3		)	0.2
Pension and other postretirement     benefit costs	(0.1		)	(0.1		)	(0.1		)	0.2			(0.1		)
Total Comprehensive Income (Loss)	$	38.0		$	20.5		$	63.6		$	(84.1	)	$	38.0

26

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended September 30, 2017

(Millions)

	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	69.8	$	57.5	$	100.7	$	(158.2	)	$	69.8
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	0.6		0.6		0.2		(0.8		)	0.6
Pension and other postretirement     benefit costs	0.1		0.1		0.1		(0.2		)	0.1
Total Comprehensive Income (Loss)	$	70.5	$	58.2	$	101.0	$	(159.2	)	$	70.5

27

Condensed Consolidating Statements of Comprehensive Income for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	177.3	$	128.1	$	258.0	$	(386.1	)	$	177.3
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	1.0		1.0		0.5		(1.5		)	1.0
Pension and other postretirement     benefit costs	1.4		1.4		1.4		(2.8		)	1.4
Total Comprehensive Income (Loss)	$	179.7	$	130.5	$	259.9	$	(390.4	)	$	179.7

28

Condensed Consolidating Statements of Comprehensive Income for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	212.8		$	178.4		$	305.9	$	(484.3	)	$	212.8
Other comprehensive income (loss):
(Loss) gain on cash flow hedge	(1.5		)	(1.5		)	—		1.5			(1.5		)
Reclassification adjustment transferred     to Net income from cash flow hedges	1.9			1.9			0.5		(2.4		)	1.9
Pension and other postretirement     benefit costs	0.8			0.8			0.8		(1.6		)	0.8
Total Comprehensive Income (Loss)	$	214.0		$	179.6		$	307.2	$	(486.8	)	$	214.0

29

Condensed Consolidating Statements of Cash Flow for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary  Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net cash provided by (used in)     operating activities	$	48.8		$	(124.6	)	$	531.1		$	—		$	455.3
INVESTING ACTIVITIES:
Capital expenditures	—			—			(354.8		)	—			(354.8		)
Proceeds from sale of operating assets	—			—			0.9			—			0.9
Advances to affiliates, net	27.7			44.3			(303.7		)	231.7			—
Net cash provided by (used in)     investing activities	27.7			44.3			(657.6		)	231.7			(353.9		)
FINANCING ACTIVITIES:
Repayment of borrowings from long-term debt	—			(185.0		)	—			—			(185.0		)
Proceeds from borrowings on revolving     credit agreement	—			—			525.0			—			525.0
Repayment of borrowings on revolving     credit agreement	—			—			(355.0		)	—			(355.0		)
Principal payment of capital lease     obligation	—			—			(0.4		)	—			(0.4		)
Advances from affiliates, net	0.1			276.3			(44.6		)	(231.7		)	0.1
Distributions paid	(76.7		)	—			—			—			(76.7		)
Net cash (used in) provided by     financing activities	(76.6		)	91.3			125.0			(231.7		)	(92.0		)
(Decrease) increase in cash and cash   equivalents	(0.1		)	11.0			(1.5		)	—			9.4
Cash and cash equivalents at   beginning of period	0.3			4.6			12.7			—			17.6
Cash and cash equivalents at     end of period	$	0.2		$	15.6		$	11.2		$	—		$	27.0

30

Condensed Consolidating Statements of Cash Flow for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net cash provided by (used in)     operating activities	$	33.8		$	(117.0	)	$	586.4		$	—		$	503.2
INVESTING ACTIVITIES:
Capital expenditures	—			—			(496.0		)	—			(496.0		)
Proceeds from sale of operating assets	—			—			63.7			—			63.7
Advances to affiliates, net	42.6			(398.5		)	(377.4		)	733.3			—
Net cash provided by (used in)     investing activities	42.6			(398.5		)	(809.7		)	733.3			(432.3		)
FINANCING ACTIVITIES:
Proceeds from long-term debt, net of     issuance cost	—			494.0			—			—			494.0
Repayment of borrowings from long-term     debt	—			(300.0		)	(275.0		)	—			(575.0		)
Proceeds from borrowings on revolving     credit agreement	—			—			505.0			—			505.0
Repayment of borrowings on revolving     credit agreement	—			—			(400.0		)	—			(400.0		)
Principal payment of capital lease     obligation	—			—			(0.3		)	—			(0.3		)
Advances from affiliates, net	0.1			334.8			398.5			(733.3		)	0.1
Distributions paid	(76.7		)	—			—			—			(76.7		)
Net cash (used in) provided by     financing activities	(76.6		)	528.8			228.2			(733.3		)	(52.9		)
(Decrease) increase in cash and cash     equivalents	(0.2		)	13.3			4.9			—			18.0
Cash and cash equivalents at     beginning of period	0.6			1.8			2.2			—			4.6
Cash and cash equivalents at     end of period	$	0.4		$	15.1		$	7.1		$	—		$	22.6

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Item 2.  Management's Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of financial condition and results of operations should be read in conjunction with our accompanying interim condensed consolidated financial statements and related notes, included elsewhere in this report and prepared in accordance with accounting principles generally accepted in the United States of America and our consolidated financial statements, related notes, Management's Discussion and Analysis of Financial Condition and Results of Operations and Risk Factors included in our Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report on Form 10-K), and our Risk Factors contained in this Quarterly Report on Form 10-Q and our Quarterly Report on Form 10-Q for the quarters ended March 31, 2018, and June 30, 2018.

On June 29, 2018, Boardwalk GP, LP (Boardwalk GP) announced that it elected to exercise its right pursuant to Section 15.1(b) of our Third Amended and Restated Agreement of Limited Partnership, as amended (the Limited Partnership Agreement) to purchase all of the issued and outstanding common units representing limited partner interests in Boardwalk Pipeline Partners, LP (Common Units) not already owned by Boardwalk GP or its affiliates (Transaction Units) for a cash purchase price, determined in accordance with the Limited Partnership Agreement, of $12.06 per unit, or approximately $1.5 billion in the aggregate. On July 18, 2018, Boardwalk GP purchased the Transaction Units. As a result of this transaction, we filed a Form 25 with the Securities and Exchange Commission to voluntarily withdraw the Common Units from listing on the New York Stock Exchange and from registration under Section 12(b) of the Securities Exchange Act of 1934 and also deregistered all of our Common Units and related equity-like securities which were authorized for sale under our effective registration statements. Subsequently, the Limited Partnership Agreement was amended which converted our Common Units to common unit equivalents in the form of partnership interests. As of September 30, 2018, Boardwalk Pipelines Holding Corp. (BPHC), a wholly-owned subsidiary of Loews Corporation, owned directly or indirectly, 100% of our capital.

Firm Agreements

A substantial portion of our transportation and storage capacity is contracted for under firm agreements. For the last twelve months ended September 30, 2018, approximately 87% of our revenues, excluding retained fuel, were derived from fixed fees under firm agreements. We expect to earn revenues of approximately $10.0 billion from fixed fees under committed firm agreements in place as of September 30, 2018, including agreements for transportation, storage and other services, over the remaining term of those agreements. This amount has increased by approximately $1.1 billion from the comparable amount at December 31, 2017, from contracts entered into during 2018. The table shown under Performance Obligations in Note 3 to the Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q, contains information regarding the revenues we expect to earn from fixed fees under committed firm agreements. For our customers that are charged maximum tariff rates related to our Federal Energy Regulatory Commission (FERC) regulated operating subsidiaries, the amounts shown in the Note 3 table reflect the current tariff rate for such services for the term of the agreements, however, the tariff rates may be subject to future adjustment. The amounts shown in the Note 3 table do not include additional revenues we have recognized and may recognize under firm agreements based on actual utilization of the contracted pipeline or storage capacity, any expected revenues for periods after the expiration dates of the existing agreements, execution of precedent agreements associated with growth projects or other events that occurred or will occur subsequent to September 30, 2018.

Contract renewals

Each year a portion of our firm transportation and storage agreements expire. Demand for firm service is primarily based on market conditions which can vary across our pipeline systems. The amount of change in firm reservation fees under contract reflects the overall market trends, including the impact from our growth projects. We focus our marketing efforts on enhancing the value of the capacity that is up for renewal and work with customers to match gas supplies from various basins to new and existing customers and markets, including aggregating supplies at key locations along our pipelines to provide end-use customers with attractive and diverse supply options. If the market perceives the value of our available capacity to be lower than our long-term view of the capacity, we may seek to shorten contract terms until market perception improves. For a discussion of recontracting risks associated with our transportation revenues, refer to our 2017 Annual Report on Form 10-K, Part I, Item 1A. Risk Factors - We may not be able to replace expiring natural gas transportation contracts at attractive rates or on a long-term basis and may not be able to sell short-term services at attractive rates or at all due to market conditions.

32

FERC Matters

Effective December 22, 2017, the Tax Cuts and Jobs Act of 2017 changed several provisions of the federal tax code, including a reduction in the maximum corporate tax rate. In addition, in the first quarter 2018, the FERC issued a set of related issuances which addressed the inclusion of federal income tax allowances in interstate pipeline companies’ rates. The FERC issued a Revised Policy Statement on Treatment of Income Taxes (Revised Policy Statement) reversing its long-standing policy by stating that it will no longer permit master limited partnerships to include an income tax allowance in their cost-of-service. As a result of the purchase of the Transaction Units by Boardwalk GP on July 18, 2018, and its election to be treated as a corporation for federal income tax purposes, the Revised Policy Statement should not have an impact on the ability of our FERC-regulated natural gas pipelines to include an income tax allowance in their cost-of-service.

Included in the first quarter 2018 issuances was a Notice of Proposed Rulemaking (NOPR) proposing rules for implementation of the Revised Policy Statement and the corporate income tax rate reduction with respect to interstate natural gas pipeline rates. On July 18, 2018, the FERC issued its final order on the NOPR, which requires all FERC-regulated natural gas pipelines to make a one-time informational filing reflecting the impacts of the Tax Cuts and Jobs Act of 2017 and the Revised Policy Statement on each individual pipeline’s cost-of-service. Customers will be provided an opportunity to protest or comment on each pipeline’s informational filing. This procedure may encourage the FERC or one or more of our customers to challenge a pipeline’s informational filings which could lead to challenges to a pipeline's currently effective maximum applicable rates pursuant to Section 5 of the Natural Gas Act (NGA). Our FERC-regulated natural gas pipelines include Texas Gas Transmission, LLC, which filed its informational filing on October 11, 2018, and Gulf South Pipeline Company, LP and Gulf Crossing Pipeline Company LLC, which are required to make their filings on December 6, 2018.

The NOPR requires that each FERC-regulated natural gas pipeline select one of four options when it makes its informational filing: 1) file a limited NGA Section 4 filing reducing its rates only as required related to the Tax Cuts and Jobs Act of 2017 and the Revised Policy Statement; 2) commit to filing a general NGA Section 4 rate case in the near future; 3) file a statement explaining why an adjustment to rates is not needed; or 4) take no other action beyond submitting the informational filing. Because of the ownership changes described above, the informational filings submitted or to be submitted by our FERC-regulated natural gas pipelines will include an income tax component in each of the pipelines’ cost-of-service.

Even without action on the NOPR or Notice of Inquiry, the FERC and/or our customers may challenge the maximum applicable rates that any of our regulated pipelines are allowed to charge in accordance with Section 5 of the NGA. The Tax Cuts and Jobs Act of 2017 and the Revised Policy Statement may increase the likelihood of such a challenge. If such a challenge is successful for any of our pipelines, the revenues associated with transportation and storage services the pipeline provides pursuant to cost-of-service rates could materially decrease in the future, which would adversely affect the revenues on that pipeline going forward.

Results of Operations

Effective January 1, 2018, we implemented the new revenue recognition standard, which did not have a material effect on our net operating revenues, operating or net income. Refer to Note 2, Accounting Policies in Part I, Item 1 of this Quarterly Report on Form 10-Q for further information.

In May 2017, we sold our Flag City Processing Partners, LLC subsidiary, which owned the Flag City processing plant and related assets, to a third party for $63.6 million, including customary adjustments. We recognized losses and impairment charges of $47.1 million on the sale, reported within Total operating costs and expenses for the nine months ended September 30, 2017.

In 2017, we executed agreements for capacity on our Fayetteville and Greenville Laterals with Southwestern Energy Company (Southwestern). These agreements reduced contracted volumes on our Fayetteville Lateral for the remaining contract term, but also provided longer term revenue generation by adding ten years of firm transportation service commitments and offered potential additional commodity fee revenue from a volume commitment. This contract restructuring will result in a reduction of firm transportation reservation revenues of approximately $63.0 million from 2018 to 2020, including a $44.0 million reduction in 2018. Refer to Part II, Item 7 of our 2017 Annual Report on Form 10-K, for further discussion of the Southwestern contract restructuring.

33

For the Nine Months Ended September 30, 2018 and 2017

Our net income for the nine months ended September 30, 2018, decreased $35.5 million, or 17%, to $177.3 million compared to $212.8 million for the nine months ended September 30, 2017, primarily due to the factors discussed below.

Operating revenues for the nine months ended September 30, 2018, decreased $86.5 million, or 9%, to $898.6 million, compared to $985.1 million for the nine months ended September 30, 2017. Excluding the net effect of the items offset in fuel and transportation expense, primarily retained fuel, operating revenues decreased $55.8 million, or 6%. The decrease was driven by a decrease in transportation revenues of $37.2 million, which resulted primarily from contract restructuring and contract expirations that were recontracted at overall lower average rates, partially offset by revenues from projects placed into service and by higher system utilization, and a decrease in storage, parking and lending revenues of $12.0 million from unfavorable market conditions.

Operating costs and expenses for the nine months ended September 30, 2018, decreased $52.7 million, or 8%, to $591.4 million, compared to $644.1 million for the nine months ended September 30, 2017. Excluding items offset in operating revenues and the $47.1 million loss on the sale of Flag City assets in 2017, operating costs and expenses increased $25.1 million, or 5% when compared to the comparable period in 2017. The operating expense increase was primarily due to higher depreciation expense and property taxes from an increased asset base from recently completed growth projects and increased employee-related costs.

Total other deductions for the nine months ended September 30, 2018, increased $2.2 million, or 2%, to $129.5 million compared to $127.3 million for the 2017 period primarily due to increased settlement charges related to our pension plan and lower allowance for equity funds used during construction due to lower capital spending.

Liquidity and Capital Resources

We anticipate that our existing capital resources, including our revolving credit facility, Subordinated Loan Agreement with BPHC and our cash flows from operating activities, will be adequate to fund our operations for 2018.

Capital Expenditures

Maintenance capital expenditures for the nine months ended September 30, 2018 and 2017, were $74.8 million and $79.3 million. Growth capital expenditures were $269.8 million and $416.7 million for the nine months ended September 30, 2018 and 2017. In the third quarter 2018, we purchased $10.2 million of natural gas to be used as base gas for our pipeline system.

Contractual Obligations

Our principal debt obligations at September 30, 2018, and December 31, 2017, were $3.7 billion. Refer to Note 8 in Part I, Item 1 of this Quarterly Report on Form 10-Q and Note 10 in Part II, Item 8 of our 2017 Annual Report on Form 10-K for more information on our financing activities and debt obligations.

Changes in cash flow from operating activities

Net cash provided by operating activities decreased $47.9 million to $455.3 million for the nine months ended September 30, 2018, compared to $503.2 million for the comparable 2017 period primarily due to the change in net income.

Changes in cash flow from investing activities

Net cash used in investing activities decreased $78.4 million to $353.9 million for the nine months ended September 30, 2018, compared to $432.3 million for the comparable 2017 period. The decrease was driven by a decrease in capital spending related to our growth projects of $141.2 million, partially offset by a decrease from the proceeds received in 2017 from the sale of the Flag City processing plant and related assets.

Changes in cash flow from financing activities

Net cash used in financing activities increased $39.1 million to $92.0 million for the nine months ended September 30, 2018, compared to $52.9 million for the comparable 2017 period. The net increase resulted primarily from the decrease in cash flow provided by net borrowings compared to the prior year period.

34

Off-Balance Sheet Arrangements

At September 30, 2018, we had no guarantees of off-balance sheet debt to third parties, no debt obligations that contain provisions requiring accelerated payment of the related obligations in the event of specified levels of declines in credit ratings and no other off-balance sheet arrangements.

Critical Accounting Policies

Certain amounts included in or affecting our unaudited condensed consolidated financial statements and related disclosures must be estimated, requiring us to make certain judgments and assumptions with respect to values or conditions that cannot be known with certainty at the time the financial statements are prepared. These estimates and judgments affect the reported amounts for assets, liabilities, revenues, expenses and our disclosure of contingent assets and liabilities in our financial statements. We evaluate these estimates and judgments on an ongoing basis, utilizing historical experience, consultation with third parties and other methods we consider reasonable. Nevertheless, actual results may differ significantly from our estimates. Any effects on our business, financial position or results of operations resulting from revisions to these estimates are recorded in the periods in which the facts that give rise to the revisions become known.

During 2018, there have been no significant changes to our critical accounting policies, judgments or estimates disclosed in our 2017 Annual Report on Form 10-K.

Forward-Looking Statements

Certain statements contained in this Quarterly Report on Form 10-Q, as well as some statements in periodic press releases and some oral statements made by our officials and our subsidiaries during presentations about us, are “forward-looking.” Forward-looking statements include, without limitation, any statement that may project, indicate or imply future results, events, performance or achievements, and may contain the words “expect,” “intend,” “plan,” “anticipate,” “estimate,” “believe,” “will likely result” and similar expressions. In addition, any statement made by our management concerning future financial performance (including future revenues, earnings or growth rates), ongoing business strategies or prospects and possible actions by our partnership or our subsidiaries, are also forward-looking statements.

Forward-looking statements are based on current expectations and projections about future events and their potential impact on us. While management believes that these forward-looking statements are reasonable as and when made, there is no assurance that future events affecting us will be those that we anticipate. All forward-looking statements are inherently subject to a variety of risks and uncertainties, many of which are beyond our control which could cause actual results to differ materially from those anticipated or projected. These include, among others, risks and uncertainties related to our ability to maintain or replace expiring gas transportation and storage contracts, our ability to complete projects that we have commenced or will commence, the impact of changes to laws and regulations, the costs of maintaining and ensuring the integrity and reliability of our pipeline systems, successful negotiation, consummation and completion of contemplated transactions, projects and agreements, to contract and physically make our systems bi-directional, and to sell short-term capacity on our pipelines.

Refer to Part II, Item 1A. of this Quarterly Report on Form 10-Q and our Quarterly Report on Form 10-Q for the quarters ended March 31, 2018, and June 30, 2018, and Part I, Item 1A. and Part II, Item 7 of our 2017 Annual Report on Form 10-K for additional risks and uncertainties regarding our forward-looking statements.

35

Item 3.  Quantitative and Qualitative Disclosures About Market Risk

Refer to Part II, Item 7A of our 2017 Annual Report on Form 10-K, for discussion of our market risk.

Item 4.  Controls and Procedures

Disclosure Controls and Procedures

As required by Rule 13a-15(b) of the Securities Exchange Act of 1934 (Exchange Act), we have evaluated, under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Our disclosure controls and procedures are designed to allow timely decisions regarding required disclosure and to provide reasonable assurance that the information required to be disclosed by us in reports that we file under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, and is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC. Based upon the evaluation, our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures were effective as of September 30, 2018, at the reasonable assurance level.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the quarter ended September 30, 2018, that have materially affected or that are reasonably likely to materially affect our internal control over financial reporting. 

36

PART II – OTHER INFORMATION

Item 1.  Legal Proceedings

For a discussion of certain of our current legal proceedings, please see Note 7 in Part I, Item 1 of this Quarterly Report on Form 10-Q.

Item 1A.  Risk Factors

Our Quarterly Report on Form 10-Q for the quarters ended March 31, 2018, and June 30, 2018, and our 2017 Annual Report on Form 10-K, include a detailed discussion of certain risk factors facing us. The information presented below describes additions to, and supplements, such risk factors and should be read in conjunction with the Risk Factors included under Part II, Item 1A. of our Quarterly Report on Form 10-Q for the quarters ended March 31, 2018, and June 30, 2018, and Part I, Item 1A. of our 2017 Annual Report on Form 10-K.

Our natural gas transportation and storage operations are subject to extensive regulation by the FERC, including rules and regulations related to the rates we can charge for our services and our ability to construct or abandon facilities. We may not be able to recover the full cost of operating our pipelines, including earning a reasonable return.

Our natural gas transportation and storage operations are subject to extensive regulation by the FERC, including the types and terms of services we may offer to our customers, the rates we can charge our customers, construction of new facilities, creation, modification or abandonment of services or facilities and recordkeeping and relationships with affiliated companies. An adverse FERC action in any of these areas could affect our ability to compete for business, construct new facilities, offer new services or recover the full cost of operating our pipelines and other facilities. This regulatory oversight can result in longer lead times to develop and complete any future project than competitors that are not subject to the FERC’s regulations. The FERC can also deny us the right to abandon certain facilities from service.

The FERC regulates the rates we can charge for our natural gas transportation and storage operations. For our cost-based services, the FERC establishes both the maximum and minimum rates we can charge. The basic elements that the FERC considers are the costs of providing service, the volumes of gas being transported, the rate design, the allocation of costs between services, the capital structure, and the rate of return a pipeline is permitted to earn.

Effective December 22, 2017, the Tax Cuts and Jobs Act of 2017 changed several provisions of the federal tax code, including a reduction in the maximum corporate tax rate. In addition, in the first quarter 2018, the FERC issued a set of related issuances which addressed the inclusion of federal income tax allowances in interstate pipeline companies’ rates. The FERC issued a Revised Policy Statement reversing its long-standing policy by stating that it will no longer permit master limited partnerships to include an income tax allowance in their cost-of-service. As a result of the purchase of the Transaction Units by Boardwalk GP on July 18, 2018, and its election to be treated as a corporation for federal income tax purposes, the Revised Policy Statement should not have an impact on the ability of our FERC-regulated natural gas pipelines to include an income tax allowance in their cost-of-service.

Included in the first quarter 2018 issuances was a Notice of Proposed Rulemaking (NOPR) proposing rules for implementation of the Revised Policy Statement and the corporate income tax rate reduction with respect to interstate natural gas pipeline rates. On July 18, 2018, the FERC issued its final order on the NOPR, which requires all FERC-regulated natural gas pipelines to make a one-time informational filing reflecting the impacts of the Tax Cuts and Jobs Act of 2017 and the Revised Policy Statement on each individual pipeline’s cost-of-service. Customers will be provided an opportunity to protest or comment on each pipeline’s informational filing. This procedure may encourage the FERC or one or more of our customers to challenge a pipeline’s informational filings which could lead to challenges to a pipeline’s currently effective maximum applicable rates pursuant to Section 5 of the NGA. Texas Gas Transmission, LLC filed its informational filing on October 11, 2018, and Gulf South Pipeline Company, LP and Gulf Crossing Pipeline Company LLC are required to make their filings on December 6, 2018.

The NOPR requires that each FERC-regulated natural gas pipeline select one of four options when it makes its informational filing: 1) file a limited NGA Section 4 filing reducing its rates only as required related to the Tax Cuts and Jobs Act of 2017 and the Revised Policy Statement; 2) commit to filing a general NGA Section 4 rate case in the near future; 3) file a statement explaining why an adjustment to rates is not needed; or 4) take no other action beyond submitting the informational filing. Because of the ownership changes described above, the informational filings submitted or to be submitted by our FERC-regulated natural gas pipelines will include an income tax component in each of the pipelines’ cost-of-service.

37

Even without action on the NOPR or Notice of Inquiry, the FERC and/or our customers may challenge the maximum applicable rates that any of our regulated pipelines are allowed to charge in accordance with Section 5 of the NGA. The Tax Cuts and Jobs Act of 2017 and the Revised Policy Statement may increase the likelihood of such a challenge. If such a challenge is successful for any of our pipelines, the revenues associated with transportation and storage services the pipeline provides pursuant to cost-of-service rates could materially decrease in the future, which would adversely affect the revenues on that pipeline going forward.

Item 6.  Exhibits

The following documents are filed or furnished as exhibits to this report:

Exhibit Number	Description
*31.1	Certification of Stanley C. Horton, Chief Executive Officer, pursuant to Rule 13a-14(a) and Rule 15d-14(a).
*31.2	Certification of Jamie L. Buskill, Chief Financial Officer, pursuant to Rule 13a-14(a) and Rule 15d-14(a).
**32.1	Certification of Stanley C. Horton, Chief Executive Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
**32.2	Certification of Jamie L. Buskill, Chief Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
*101.INS	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
*101.SCH	XBRL Taxonomy Extension Schema Document
*101.CAL	XBRL Taxonomy Calculation Linkbase Document
*101.DEF	XBRL Taxonomy Extension Definitions Document
*101.LAB	XBRL Taxonomy Label Linkbase Document
*101.PRE	XBRL Taxonomy Presentation Linkbase Document
* Filed herewith
** Furnished herewith

38

SIGNATURE

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Boardwalk Pipeline Partners, LP
	By: Boardwalk GP, LP its general partner
	By: Boardwalk GP, LLC its general partner
November 5, 2018	By:	/s/  Jamie L. Buskill
		Jamie L. Buskill Senior Vice President, Chief Financial and Administrative Officer and Treasurer (Duly authorized officer and principal financial officer)

39

EX-31.1

EXHIBIT 31.1

Certification of Chief Executive Officer

Pursuant to Rule 13A-14(A) and Rule 15D-14(A)

of the Securities Exchange Act of 1934, as Amended

I, Stanley C. Horton, certify that:

1) I have reviewed this Quarterly Report on Form 10-Q of Boardwalk Pipeline Partners, LP;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5) The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated:	November 5, 2018	/s/ Stanley C. Horton
		Stanley C. Horton
		President, Chief Executive Officer and Director

EX-31.2

EXHIBIT 31.2

Certification of Chief Financial Officer

Pursuant to Rule 13A-14(A) and Rule 15D-14(A)

of the Securities Exchange Act of 1934, as Amended

I, Jamie L. Buskill, certify that:

1) I have reviewed this Quarterly Report on Form 10-Q of Boardwalk Pipeline Partners, LP;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5) The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Dated:	November 5, 2018	/s/ Jamie L. Buskill
		Jamie L. Buskill
		Senior Vice President, Chief Financial and Administrative Officer and Treasurer

EX-32.1

EXHIBIT 32.1

Certification by the Chief Executive Officer

of

Boardwalk GP, LLC

pursuant to 18 U.S.C. Section 1350

(as adopted by Section 906 of the Sarbanes-Oxley Act of 2002)

Pursuant to 18 U.S.C. Section 1350, the undersigned chief executive officer of Boardwalk GP, LLC hereby certifies, to such officer's knowledge, that the quarterly report on Form 10-Q for the period ended September 30, 2018, (the Report) of Boardwalk Pipeline Partners, LP (the Partnership) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

November 5, 2018

/s/ Stanley C. Horton

Stanley C. Horton

President, Chief Executive Officer and Director

(principal executive officer)

EX-32.2

EXHIBIT 32.2

Certification by the Chief Financial Officer

of

Boardwalk GP, LLC

pursuant to 18 U.S.C. Section 1350

(as adopted by Section 906 of the Sarbanes-Oxley Act of 2002)

Pursuant to 18 U.S.C. Section 1350, the undersigned chief financial officer of Boardwalk GP, LLC hereby certifies, to such officer's knowledge, that the quarterly report on Form 10-Q for the period ended September 30, 2018, (the Report) of Boardwalk Pipeline Partners, LP (the Partnership) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

November 5, 2018

/s/ Jamie L. Buskill

Jamie L. Buskill

Senior Vice President, Chief Financial and Administrative Officer and Treasurer

(principal financial officer)

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 05, 2018
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Registrant Name	BOARDWALK PIPELINE PARTNERS, LP
Entity Central Index Key	0001336047
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		0
Entity Small Business	false
Entity Emerging Growth Company	false

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 27.0	$ 17.6
Receivables:
Trade, net	89.4	116.8
Other	32.9	16.6
Gas transportation receivables	8.3	4.6
Costs recoverable from customers	11.1	0.0
Prepayments	25.9	17.9
Other current assets	0.9	7.1
Total current assets	195.5	180.6
Property, Plant and Equipment:
Natural gas transmission and other plant	10,952.6	10,467.1
Construction work in progress	258.9	416.5
Property, plant and equipment, gross	11,211.5	10,883.6
Less—accumulated depreciation and amortization	2,863.3	2,621.1
Property, plant and equipment, net	8,348.2	8,262.5
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	81.7	86.3
Other	138.5	139.8
Total other assets	457.6	463.5
Total Assets	9,001.3	8,906.6
Payables:
Trade	65.4	76.0
Affiliates	1.6	1.5
Other	18.3	11.9
Gas payables	8.2	5.7
Accrued taxes, other	76.4	57.1
Accrued interest	36.6	37.9
Accrued payroll and employee benefits	27.9	33.7
Construction retainage	17.6	32.4
Deferred income	0.9	1.9
Other current liabilities	19.9	22.3
Total current liabilities	272.8	280.4
Long-term debt and capital lease obligation	3,675.2	3,686.8
Other Liabilities and Deferred Credits:
Pension liability	19.0	21.8
Asset retirement obligation	57.1	46.0
Provision for other asset retirement	70.2	65.8
Payable to affiliate	0.0	16.0
Other	76.0	65.0
Total other liabilities and deferred credits	222.3	214.6
Commitments and Contingencies
Partners’ Capital:
Common units - 250.3 million units issued and outstanding December 31, 2017	0.0	4,713.1
General partner	0.0	92.7
Partners' capital	4,909.6	0.0
Accumulated other comprehensive loss	(78.6)	(81.0)
Total partners’ capital	4,831.0	4,724.8
Total Liabilities and Partners' Capital	$ 9,001.3	$ 8,906.6

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - shares shares in Millions	Sep. 30, 2018	Dec. 31, 2017
Common units issued	0.0	250.3
Common units outstanding	0.0	250.3

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Revenues:
Transportation	$ 245.8	$ 266.4	$ 792.8	$ 852.0
Storage, parking and lending	21.1	23.2	67.8	79.8
Other	11.0	10.9	38.0	53.3
Total operating revenues	277.9	300.5	898.6	985.1
Operating Costs and Expenses:
Fuel and transportation	3.5	9.0	12.0	42.7
Operation and maintenance	46.9	49.0	144.2	141.0
Administrative and general	32.8	27.1	100.6	96.9
Depreciation and amortization	88.9	80.6	256.6	241.4
(Gain) loss on sale of assets and impairments	(0.2)	0.0	(0.7)	47.1
Taxes other than income taxes	25.2	24.8	78.7	75.0
Total operating costs and expenses	197.1	190.5	591.4	644.1
Operating income	80.8	110.0	307.2	341.0
Other Deductions (Income):
Interest expense	43.5	41.0	130.9	131.1
Interest income	0.0	0.0	(0.1)	(0.3)
Miscellaneous other income, net	(0.7)	(1.1)	(1.3)	(3.5)
Total other deductions	42.8	39.9	129.5	127.3
Income before income taxes	38.0	70.1	177.7	213.7
Income taxes	0.1	0.3	0.4	0.9
Net income	$ 37.9	$ 69.8	$ 177.3	$ 212.8

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 37.9	$ 69.8	$ 177.3	$ 212.8
Other comprehensive income (loss):
Loss on cash flow hedge	0.0	0.0	0.0	(1.5)
Reclassification adjustment transferred to Net income from cash flow hedges	0.2	0.6	1.0	1.9
Pension and other postretirement benefit costs	(0.1)	0.1	1.4	0.8
Total Comprehensive Income	$ 38.0	$ 70.5	$ 179.7	$ 214.0

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities:
Net income	$ 177.3	$ 212.8
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	256.6	241.4
Amortization of deferred costs and other	8.8	4.9
(Gain) loss on sale of assets and impairments	(0.7)	47.1
Changes in operating assets and liabilities:
Trade and other receivables	10.9	31.2
Gas receivables and storage assets	0.6	(1.3)
Costs recoverable from customers	(11.1)	3.0
Other assets	(7.9)	(4.4)
Trade and other payables	2.6	(22.0)
Gas payables	1.2	(5.4)
Accrued liabilities	16.0	9.5
Other liabilities	1.0	(13.6)
Net cash provided by operating activities	455.3	503.2
Investing Activities:
Capital expenditures	(354.8)	(496.0)
Proceeds from sale of operating assets	0.9	63.7
Net cash used in investing activities	(353.9)	(432.3)
Financing Activities:
Proceeds from long-term debt, net of issuance cost	0.0	494.0
Repayment of borrowings from long-term debt	(185.0)	(575.0)
Proceeds from borrowings on revolving credit agreement	525.0	505.0
Repayment of borrowings on revolving credit agreement	(355.0)	(400.0)
Principal payment of capital lease obligation	(0.4)	(0.3)
Advances from affiliates	0.1	0.1
Distributions paid	(76.7)	(76.7)
Net cash used in financing activities	(92.0)	(52.9)
Increase in cash and cash equivalents	9.4	18.0
Cash and cash equivalents at beginning of period	17.6	4.6
Cash and cash equivalents at end of period	$ 27.0	$ 22.6

XML

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (Unaudited) - USD ($) $ in Millions	Total	Accumulated Other Comp Income (Loss)	Limited Partner Common Units	General Partner	Partners' Capital
Beginning balance at Dec. 31, 2016	$ 4,530.9	$ (80.1)	$ 4,522.2	$ 88.8
Add (deduct):
Net income	212.8		208.6	4.2
Distributions paid	(76.7)		(75.2)	(1.5)
Other comprehensive income, net of tax	1.2	1.2
Ending balance at Sep. 30, 2017	4,668.2	(78.9)	4,655.6	91.5
Beginning balance at Dec. 31, 2017	4,724.8	(81.0)	4,713.1	92.7
Add (deduct):
Net income	177.3		136.6	2.8	$ 37.9
Distributions paid	(76.7)		(50.1)	(1.0)	(25.6)
Other comprehensive income, net of tax	2.4	2.4
General Partner purchase of common units and conversion to partnership interests	0.0		(4,803.0)	(94.3)	4,897.3
Ending balance at Sep. 30, 2018	4,831.0	$ (78.6)	0.0	0.0	$ 4,909.6
Add (deduct):
Cumulative effect adjustment from the implementation of ASC 606	(12.8)		(12.6)	$ (0.2)
Adjustment related to registration rights agreement	$ 16.0		$ 16.0

XML

Basis of Presentation

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

Boardwalk Pipeline Partners, LP (the Partnership) is a Delaware limited partnership formed in 2005 to own and operate the business conducted by its primary subsidiary Boardwalk Pipelines, LP (Boardwalk Pipelines) and its operating subsidiaries, which consists of integrated natural gas and natural gas liquids and other hydrocarbons (herein referred to together as NGLs) pipeline and storage systems.

On June 29, 2018, Boardwalk GP, LP (Boardwalk GP) announced that it elected to exercise its right pursuant to Section 15.1(b) of the Partnership’s Third Amended and Restated Agreement of Limited Partnership, as amended (the Limited Partnership Agreement) to purchase all of the issued and outstanding common units representing limited partner interests in the Partnership (Common Units) not already owned by Boardwalk GP or its affiliates (Transaction Units) for a cash purchase price, determined in accordance with the Limited Partnership Agreement, of $12.06 per unit, or approximately $1.5 billion in the aggregate (Purchase Right). On July 18, 2018, Boardwalk GP purchased the Transaction Units. As a result of this transaction, the Partnership filed a Form 25 with the Securities and Exchange Commission (SEC) to voluntarily withdraw the Common Units from listing on the New York Stock Exchange (NYSE) and from registration under Section 12(b) of the Securities Exchange Act of 1934 and also deregistered all of its Common Units and related equity-like securities which were authorized for sale under its effective registration statements. Subsequently, the Limited Partnership Agreement was amended which converted the Partnership's Common Units to common unit equivalents in the form of partnership interests. The Partnership’s Common Units were traded on the NYSE through July 17, 2018, under the symbol “BWP”. As of September 30, 2018, Boardwalk Pipelines Holding Corp. (BPHC), a wholly-owned subsidiary of Loews Corporation (Loews), owned directly or indirectly, 100% of the Partnership’s capital.

The accompanying unaudited condensed consolidated financial statements of the Partnership were prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting of only normal recurring accruals) necessary to present fairly the Partnership's financial position as of September 30, 2018, and December 31, 2017, and its results of operations and comprehensive income for the three and nine months ended September 30, 2018 and 2017, and changes in cash flows and changes in partners' capital for the nine months ended September 30, 2018 and 2017. Reference is made to the Notes to the Consolidated Financial Statements in the Partnership's Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report on Form 10-K), which should be read in conjunction with these unaudited condensed consolidated financial statements. The accounting policies described in Note 2 of Part II, Item 8 of the Partnership's 2017 Annual Report on Form 10-K are the same used in preparing the accompanying unaudited condensed consolidated financial statements, except for the changes described in Note 2 below.

Certain amounts reported within Total operating revenues for the 2017 period have been reclassified to conform to the current presentation as a result of changes in accounting policies from the implementation of Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers, which was codified in Accounting Standards Codification (ASC) Topic 606 (ASC 606) further described below. The effect of the reclassification decreased Transportation revenues and increased Other revenues by $6.5 million and $18.2 million for the three and nine months ended September 30, 2017. Additionally, Storage, parking and lending (PAL) revenues are now reported combined. These reclassifications and combinations had no impact on Total operating revenues, Operating income or Net income. Net income for interim periods may not necessarily be indicative of results for the full year.

XML

Accounting Policies

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

New Accounting Pronouncements and Changes in Accounting Principles

Accounting Policies

Accounting Pronouncements Adopted in 2018 - Revenue Recognition

In May 2014, the Financial Accounting Standards Board (FASB) issued ASC 606. ASC 606 supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition (ASC 605), and requires the recognition of revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services.

Effective January 1, 2018, the Partnership implemented ASC 606 using the modified retrospective method, without adjustment to the comparative period information, which remains reported under ASC 605. Upon implementation, the Partnership recorded a cumulative reduction to partners’ capital of $12.8 million resulting from two items: (i) contracts which had changes to rates during the service period without corresponding changes in service levels provided by the Partnership, with an offsetting increase to other liabilities of $6.4 million, and (ii) the de-recognition of excess fuel received from customers which elected to have fuel retained in-kind, with an offsetting decrease to current gas stored underground of $6.4 million. Upon the implementation of ASC 606, most retained fuel was not considered additional consideration included in the transaction price. As a result, retained fuel is recorded as a reduction to fuel and transportation expense and will be recognized as Other revenue upon the physical sale of natural gas, when under ASC 605, fuel retained was recognized as part of Transportation revenue. The Partnership elected to apply ASC 606 to contracts with customers, and applicable amendments, which were not completed prior to the implementation date.

The following table summarizes the effect on the Partnership’s condensed consolidated financial statements as of September 30, 2018, and for the three and nine months ended September 30, 2018, (in millions) had ASC 606 not been implemented on January 1, 2018:

	As Reported September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Balance Sheet:
Other current assets (gas stored underground)	$	0.4	$	4.0		$	4.4
Gas stored underground	81.7		0.3			82.0
Other assets	138.5		(0.1		)	138.4
Other liabilities	76.0		(8.1		)	67.9
Partners' Capital	4,831.0		12.2			4,843.2

	As Reported For the Three Months Ended September 30, 2018		Adjustments		Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	245.8	$	5.5	$	251.3
Storage, parking and lending	21.1		0.1		21.2
Other	11.0		0.1		11.1
Total operating revenues	277.9		5.7		283.6
Fuel and transportation expense	3.5		4.6		8.1
Operating income	80.8		1.0		81.8
Net income	37.9		1.0		38.9

	As Reported For the Nine Months Ended September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	792.8	$	17.5		$	810.3
Storage, parking and lending	67.8		0.3			68.1
Other	38.0		(4.5		)	33.5
Total operating revenues	898.6		13.3			911.9
Fuel and transportation expense	12.0		13.8			25.8
Operating income	307.2		(0.6		)	306.6
Net income	177.3		(0.6		)	176.7

The implementation of ASC 606 had no impact on the total operating, financing or investing activities of the Partnership’s Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2018.

Revenue Recognition

Nature of Contracts

The Partnership primarily earns revenues from contracts with customers by providing transportation and storage services for natural gas and NGLs on a firm and interruptible basis. The Partnership also provides interruptible natural gas PAL services. The Partnership’s customers choose, based upon their particular needs, the applicable mix of services depending upon availability of pipeline and storage capacity, the price of services and the volume and timing of customer requirements. The maximum rates that may be charged by the majority of the Partnership’s operating subsidiaries are established through the Federal Energy Regulatory Commission's (FERC) cost-based rate-making process; however, rates actually charged by those operating subsidiaries may be less than those allowed by the FERC. Under the FERC regulations, certain revenues that the Partnership's subsidiaries collect may be subject to possible refunds to customers. Accordingly, during a rate case, estimated refund liabilities are recorded considering regulatory proceedings, advice of counsel and estimated risk-adjusted total exposure, as well as other factors. The Partnership's service contracts can range from one to twenty years although the Partnership may enter into shorter- or longer-term contracts, and services are invoiced monthly with payment from the customer generally expected within ten to thirty days, depending on the terms of the contract.

Firm Service Contracts: The Partnership offers firm services to its customers. The Partnership’s customers can reserve a specific amount of pipeline capacity at specified receipt and delivery points on the Partnership’s pipeline system (transportation service) or can reserve a specific amount of storage capacity at specified injection and withdrawal points at the Partnership’s storage facilities (storage service). The Partnership accounts for firm services as a single promise to stand ready each month of the contract term to provide the committed capacity for either transportation or storage services when needed by the customer, which represents a series of distinct monthly services that are substantially the same with the same pattern of transfer to the customer. Although several activities may be required to provide the firm service, the individual activities do not represent distinct performance obligations because all of the activities must be performed in combination in order for the Partnership to provide the firm service.

The transaction price for firm service contracts is comprised of a fixed fee based on the quantity of capacity reserved, regardless of use (capacity reservation fee), plus variable fees in the form of a usage fee paid on the volume of commodity actually transported or injected and withdrawn from storage. Both the fixed and usage fees are allocated to the single performance obligation of providing transportation or storage service and recognized over time based upon the output measure of time as the Partnership completes its stand-ready obligation to provide contracted capacity and the customer receives and consumes the benefit of the reserved capacity, which corresponds with the transfer of control to the customer. The fixed fee is recognized ratably over the contract term, representative of the proportion of the committed stand-ready capacity obligation that has been fulfilled to date, and the usage fee is recognized upon satisfaction of each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the stand-ready obligation in a given month. Capacity reservation revenues derived from a firm service contract are generally consistent during the contract term, but can be higher in winter periods than the rest of the year based upon seasonal rates.

Interruptible Service Contracts: In providing interruptible services to customers, the Partnership agrees to transport natural gas or NGLs for a customer when capacity is available. The Partnership does not account for interruptible services with a customer as a contract until the customer nominates for service and the Partnership accepts the nomination based upon available pipeline or storage capacity because there are no enforceable rights and obligations until that time. The nomination and acceptance process is a daily activity and acceptance is granted based upon priority of service and availability of capacity. Upon acceptance, the Partnership accounts for interruptible services similarly to its firm services.

The transaction price for interruptible service contracts is comprised of a variable fee in the form of a usage fee paid on the volume of commodity actually transported or injected and withdrawn from storage. The usage fee is allocated to the single performance obligation of providing interruptible service. Interruptible service revenues are generally recognized over time based on the output measure of volume transported or stored when services are rendered upon the successful allocation of the services provided to the customer’s account, which best depicts the transfer of control to the customer and satisfaction of the promised service. Interruptible services are recognized in the month services are provided because the Partnership has a right to consideration from customers in amounts that correspond directly to the value that the customer receives from the Partnership's performance. The rates charged may vary on a daily, monthly or seasonal basis.

Minimum Volume Commitment (MVC) Contracts: Certain of the Partnership’s transportation or storage contracts require customers to transport or store a minimum volume of commodity over a specified time period. If a customer fails to meet its MVC for the specified time period, the customer is obligated to pay a contractually-determined deficiency fee based upon the shortfall between the actual volumes transported or stored and the MVC for that period. MVC contracts are similar in nature to a firm service contract where the performance obligation is a stand-ready obligation that is a series of distinct services that are substantially the same with the same pattern of transfer to the customer. The transaction price for an MVC is a fee for the volume of commodity actually transported or stored, which is allocated to each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the obligation of the transacted service in a given month. Revenues are generally recognized over time based on the output measure of volume transported or stored, with the recognition of the deficiency fee in the period when it is known the customer cannot make up the deficient volume in the specified period.

Other: Periodically, the Partnership may enter into contracts with customers for the sale of natural gas or NGLs. The Partnership recognizes revenues for these transactions at the point in time of the physical sale of the commodity, which corresponds with the transfer of control of the commodity to the customer and the consideration is measured as the stated sales price in the contract.

Contract Balances

The Partnership records contract assets primarily related to performance obligations completed but not billed as of the reporting date. The Partnership records contract liabilities, or deferred income, when payment is received in advance of satisfying its performance obligations.

Accounting Pronouncements Adopted in 2018 - Retirement Benefits

In March 2017, the FASB issued ASU 2017-07, Retirement Benefits - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07), which required entities to retroactively present the service cost component of net periodic postretirement benefit cost with other employee compensation costs in the income statement and present all other net periodic pension costs as a component of non-operating income. Effective January 1, 2018, the Partnership implemented ASU 2017-07 and reclassified $0.8 million and $1.8 million of other components of net periodic benefit cost for the three and nine months ended September 30, 2017, which resulted in an increase to Miscellaneous other income, net and Administrative and general expense in the Condensed Consolidated Statements of Income, with no impact on Net income.

Other Recently Issued Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (ASU 2016-02), which will require, among other things, the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current GAAP. The amendments are to be applied at the beginning of the earliest period presented using a modified retrospective approach, but include an elective transition method that allows entities to initially apply the updated guidance as of the adoption date. The Partnership has elected to apply this elective transition method. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. The Partnership is progressing with its project to evaluate the impact that ASU 2016-02 will have on its financial statements when implemented. ASU 2016-02 contains a practical expedient package, under which all criteria must be applied to all of its leases. The practical expedient package allows an entity to (i) not reassess whether expired or existing contracts are or contain leases; (ii) not reassess the lease classification for any expired or existing leases; and (iii) not reassess initial direct costs for any existing leases. The Partnership has elected to apply the practical expedient package to all of its leases.

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Revenues

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer

Revenues

The Partnership operates in one reportable segment and contracts directly with producers of natural gas and with end-use customers, including local distribution companies, marketers, electric power generators, industrial users and interstate and intrastate pipelines, who, in turn, provide transportation and storage services for end-users. The following table presents the Partnership's revenues disaggregated by type of service for the three and nine months ended September 30, 2018 (in millions):

	For the Three Months Ended September 30, 2018		For the Nine Months Ended September 30, 2018
Revenues from Contracts with Customers
Firm Service (1)	$	264.5	$	850.9
Interruptible Service	7.7		25.0
Other revenues	1.2		9.7
Total revenues from contracts with customers	273.4		885.6
Other operating revenues(2)	4.5		13.0
Total Operating Revenues	$	277.9	$	898.6

(1) Revenues earned from contracts with MVCs are included in firm service given the stand-ready nature of the performance obligation and the guaranteed nature of the fees over the contract term.

(2) Other operating revenues include certain revenues earned from operating leases, pipeline management fees and other activities that are not considered central and ongoing major business operations of the Partnership and do not represent revenues earned from contracts with customers.

Contract Balances

As of September 30, 2018, the Partnership had receivables recorded in Trade Receivables, contract assets recorded in Other current assets, and contract liabilities recorded in Other liabilities, from contracts with customers of $89.4 million, $17.1 million and $9.1 million. The contract asset is a result of the Partnership recognizing revenue related to a stand-ready performance obligation for transportation and storage services which will be invoiced per the contractual terms of the agreement, but within the next nine months.

Contract liabilities are expected to be recognized through 2026. Significant changes in the contract liabilities balances during the nine months ended September 30, 2018, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2017	$	1.9
Cumulative effect adjustment from the implementation of     ASC 606	6.4
Revenues recognized that were included in the contract liability     balance at the beginning of the period	(2.3		)
Increases due to cash received, excluding amounts recognized as     revenues during the period	3.1
Balance as of September 30, 2018	$	9.1

Performance Obligations

The following table includes estimated operating revenues expected to be recognized in the future related to agreements that contain performance obligations that were unsatisfied as of September 30, 2018, as well as actual fixed fee revenues recognized for the fulfillment of performance obligations for the 2018 period for those same agreements. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, as in accordance with firm service contracts. Additionally, for the Partnership’s customers that are charged maximum tariff rates related to its FERC-regulated operating subsidiaries, the amounts below reflect the current tariff rate for such services for the term of the agreements; however, the tariff rates may be subject to future adjustment. The Partnership has elected to exclude the following from the table: (a) unsatisfied performance obligations from usage fees associated with its firm services because of the stand-ready nature of such services; (b) consideration in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) consideration that was received prior to September 30, 2018, that will be recognized in future periods, such as recorded in contract liabilities.    

	As of September 30, 2018 (in millions)
	2018 (1)		2019		Thereafter		Total
Estimated revenues from contracts with customers    from unsatisfied performance obligations as of    September 30, 2018	$	1,065.0	$	1,038.0	$	7,630.0	$	9,733.0
Operating revenues which are fixed and     determinable (operating leases)	13.5		18.0		230.5		262.0
Total projected operating revenues under committed     firm agreements	$	1,078.5	$	1,056.0	$	7,860.5	$	9,995.0

(1)

For the 2018 period, $797.0 million represents actual fixed fee revenues recognized for the fulfillment of performance obligations during the nine months ended September 30, 2018.

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Asset Disposition and Impairments

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]

Asset Disposition and Impairments

Asset Disposition and ImpairmentsIn May 2017, the Partnership sold its Flag City Processing Partners, LLC subsidiary, which owned the Flag City processing plant and related assets, to a third party for $63.6 million, including customary adjustments. The Partnership recognized losses and impairment charges, reported within Total operating costs and expenses, of $47.1 million on the sale.

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Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables

9 Months Ended

Sep. 30, 2018

Gas Balancing Arrangements [Abstract]

Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables

Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables

The operating subsidiaries of the Partnership provide storage services whereby they store natural gas or NGLs on behalf of customers and also periodically hold customer gas under PAL services. Since the customers retain title to the gas held by the Partnership in providing these services, the Partnership does not record the related gas on its balance sheet.

The operating subsidiaries of the Partnership also periodically lend gas to customers under PAL and certain firm services, and gas or NGLs may be owed to the operating subsidiaries as a result of transportation imbalances. As of September 30, 2018, the amount of gas owed to the operating subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 7.9 trillion British thermal units (TBtu). Assuming an average market price during September 2018 of $2.83 per million British thermal unit, the market value of that gas was approximately $22.4 million. As of September 30, 2018, the amount of NGLs owed to the Partnership's operating subsidiaries due to imbalances was less than 0.1 million barrels, which had a market value of approximately $1.1 million dollars. As of December 31, 2017, the amount of gas owed to the operating subsidiaries of the Partnership due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 12.3 TBtu. As of December 31, 2017, there were no outstanding NGL imbalances owed to the operating subsidiaries. If any significant customer should have credit or financial problems resulting in a delay or failure to repay the gas owed to the operating subsidiaries, it could have a material adverse effect on the Partnership’s financial condition, results of operations or cash flows.

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Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Other Comprehensive Income (OCI) and Fair Value Measurements

Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements

AOCI

The Partnership had no outstanding derivatives at September 30, 2018, and December 31, 2017, but had $4.0 million and $5.0 million of AOCI related to cash flow hedges as of September 30, 2018, and December 31, 2017, which relate to settled treasury rate locks that are being amortized to earnings over the terms of the related interest payments, generally the terms of the related debt. The Partnership estimates that approximately $0.9 million of net losses from cash flow hedges reported in AOCI as of September 30, 2018, are expected to be reclassified into earnings within the next twelve months.

Financial Assets and Liabilities

The following methods and assumptions were used in estimating the fair value amounts included in the disclosures for financial assets and liabilities, which are consistent with those disclosed in the 2017 Annual Report on Form 10-K:

Cash and Cash Equivalents: For cash and short-term financial assets, the carrying amount is a reasonable estimate of fair value due to the short maturity of those instruments.

Long-Term Debt: The estimated fair value of the Partnership's publicly traded debt is based on quoted market prices at September 30, 2018, and December 31, 2017. The fair market value of the debt that is not publicly traded is based on market prices of similar debt at September 30, 2018, and December 31, 2017. The carrying amount of the Partnership's variable-rate debt at September 30, 2018, and December 31, 2017, approximated fair value.

The carrying amounts and estimated fair values of the Partnership's financial assets and liabilities which were not recorded at fair value on the Condensed Consolidated Balance Sheets as of September 30, 2018, and December 31, 2017, were as follows (in millions):

As of September 30, 2018				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	27.0		$	27.0	$	—	$	—	$	27.0
Financial Liabilities
Long-term debt	$	3,675.1	(1)	$	—	$	3,731.1	$	—	$	3,731.1

(1) The carrying amount of long-term debt excludes a $7.6 million long-term capital lease obligation and

$7.5 million of unamortized debt issuance costs.

As of December 31, 2017				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.6		$	17.6	$	—	$	—	$	17.6
Financial Liabilities
Long-term debt	$	3,687.5	(1)	$	—	$	3,889.4	$	—	$	3,889.4

(1) The carrying amount of long-term debt excludes an $8.1 million long-term capital lease obligation and

$8.8 million of unamortized debt issuance costs.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings and Settlements

The Partnership's subsidiaries are parties to various legal actions arising in the normal course of business. Management believes the disposition of these outstanding legal actions will not have a material impact on the Partnership's financial condition, results of operations or cash flows.

Mishal and Berger Litigation

On May 25, 2018, plaintiffs Tsemach Mishal and Paul Berger (on behalf of themselves and the purported class, Plaintiffs) initiated a purported class action in the Court of Chancery of the State of Delaware (the Court) against the following defendants: the Partnership, Boardwalk GP, Boardwalk GP, LLC and BPHC (together, Defendants), regarding the potential exercise by Boardwalk GP of its Purchase Right.

On June 25, 2018, Plaintiffs and Defendants entered into a Stipulation and Agreement of Compromise and Settlement, subject to the approval of the Court (the Proposed Settlement). Under the terms of the Proposed Settlement, the lawsuit would be dismissed, and related claims against the Defendants would be released by the Plaintiffs, if BPHC, the sole member of the general partner of Boardwalk GP, elected to cause Boardwalk GP to exercise the Purchase Right and gave notice of such election as provided in the Limited Partnership Agreement within a period specified by the Proposed Settlement. On June 29, 2018, Boardwalk GP elected to exercise the Purchase Right and gave notice within the period specified by the Proposed Settlement. On July 18, 2018, Boardwalk GP completed the purchase of the Common Units pursuant to the Purchase Right as further described in Note 1.

On September 27, 2018, the Court denied approval of the Proposed Settlement. The Court has not set a schedule for further proceedings in the case.

Commitments for Construction

The Partnership’s future capital commitments are comprised of binding commitments under purchase orders for materials ordered but not received and firm commitments under binding construction service agreements. The commitments as of September 30, 2018, were approximately $162.5 million, all of which are expected to be settled within the next twelve months.

There were no substantial changes to the Partnership’s operating lease commitments, pipeline capacity agreements or capital lease obligation disclosed in Notes 4 and 10 of Part II, Item 8 of the Partnership’s 2017 Annual Report on Form 10-K.

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Financing

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Financing

  Financing

Notes and Debentures

As of September 30, 2018, and December 31, 2017, the Partnership had notes and debentures outstanding of $3.1 billion and $3.3 billion with weighted-average interest rates of 5.17% and 5.18%. The indentures governing the notes and debentures have restrictive covenants which provide that, with certain exceptions, neither the Partnership nor any of its subsidiaries may create, assume or suffer to exist any lien upon any property to secure any indebtedness unless the debentures and notes shall be equally and ratably secured. All of the Partnership's debt obligations are unsecured. At September 30, 2018, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.

The Partnership has included $350.0 million of notes which mature in less than one year as long-term debt on its Condensed Consolidated Balance Sheet as of September 30, 2018. The Partnership has the intent and the ability to refinance the notes through the available borrowing capacity under its revolving credit facility as of September 30, 2018. The Partnership expects to retire these notes at their maturity.

Issuance of Notes

The Partnership had no debt issuances for the nine months ended September 30, 2018. During the nine months ended September 30, 2017, the Partnership completed the following debt issuance (in millions, except interest rates):

Date of Issuance	Issuing Subsidiary	Amount of  Issuance		Purchaser Discounts and Expenses		Net Proceeds			Interest Rate	Maturity Date	Interest Payable
January 2017	Boardwalk Pipelines	$	500.0	$	6.0	$	494.0	(1)	4.45%	July 15, 2027	January 15 and July 15

(1) The net proceeds of this offering were used to retire the outstanding $275.0 million aggregate principal amount of Gulf South Pipeline Company, LP's 6.30% notes due 2017 and to fund growth capital expenditures.

Redemption of Notes

On June 1, 2018, the Partnership retired the Boardwalk Pipelines $185.0 million 5.20% notes at maturity with borrowings under its revolving credit facility.

Revolving Credit Facility

Outstanding borrowings under the Partnership’s revolving credit facility as of September 30, 2018, and December 31, 2017, were $555.0 million and $385.0 million, with weighted-average borrowing rates of 3.42% and 2.72%. The Partnership and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of September 30, 2018. The revolving credit facility has a borrowing capacity of $1.5 billion through May 26, 2020, and a borrowing capacity of $1.475 billion from May 27, 2020, to May 26, 2022.

Subordinated Loan Agreement with Affiliate

The Partnership has in place a Subordinated Loan Agreement with BPHC (Subordinated Loan) under which the Partnership can borrow up to $300.0 million through December 31, 2018. Through the date of this Quarterly Report on Form 10-Q, the Partnership had no outstanding borrowings under the Subordinated Loan.

Registration Rights Agreement

The Partnership had previously entered into an Amended and Restated Registration Rights Agreement with BPHC under which the Partnership agreed to register the resale of up to 27.9 million Common Units by BPHC and to reimburse BPHC up to a maximum amount of $0.914 per Common Unit for underwriting discounts and commissions. As of December 31, 2017, the Partnership had a $16.0 million accrued liability for future underwriting discounts and commissions that would be reimbursed to BPHC. However, due to the purchase of the Transaction Units by Boardwalk GP described in Note 1, the $16.0 million liability was reversed in the second quarter 2018, with an offsetting adjustment to partners' capital.

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Employee Benefits

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Employee Benefits

 Employee Benefits

Defined Benefit Retirement Plans and Postretirement Benefits Other Than Pension (PBOP)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended September 30, 2018 and 2017, were as follows (in millions):

	Retirement Plans						PBOP
	For the Three Months Ended September 30,						For the Three Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	0.7		$	0.8		$	—		$	—
Interest cost	1.2			1.2			0.4			0.4
Expected return on plan assets	(1.7		)	(2.0		)	(1.2		)	(1.1		)
Amortization of unrecognized net loss	0.3			0.4			—			—
Settlement charge	0.4			0.4			—			—
Net periodic benefit cost	$	0.9		$	0.8		$	(0.8	)	$	(0.7	)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2018 and 2017, were as follows (in millions):

	Retirement Plans						PBOP
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	2.5		$	2.6		$	0.1		$	0.1
Interest cost	3.4			3.5			1.1			1.2
Expected return on plan assets	(5.7		)	(5.9		)	(3.5		)	(3.3		)
Amortization of unrecognized net loss	1.1			1.3			—			—
Settlement charge	2.6			1.5			—			—
Net periodic benefit cost	$	3.9		$	3.0		$	(2.3	)	$	(2.0	)

The components of net periodic benefit cost, other than the service cost component, are included in Miscellaneous other income, net and the service cost component is included in Administrative and general on the Condensed Consolidated Statements of Income.    

The Partnership contributed $3.0 million to the defined benefit pension plan in the third quarter 2018.

Defined Contribution Plans

Texas Gas Transmission, LLC employees hired on or after November 1, 2006, and all other employees of the Partnership are provided retirement benefits under a defined contribution money purchase plan. The Partnership also provides 401(k) plan benefits to its employees. Costs related to the Partnership’s defined contribution plans were $2.7 million for the three months ended September 30, 2018 and 2017, and $8.0 million and $8.1 million for the nine months ended September 30, 2018 and 2017.

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Related Party Transactions

9 Months Ended

Sep. 30, 2018

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

Loews provides a variety of corporate services to the Partnership under service agreements, including but not limited to, information technology, tax, risk management, internal audit and corporate development services and also charges the Partnership for allocated overheads. The Partnership incurred charges related to these services of $1.6 million and $1.7 million for the three months ended September 30, 2018 and 2017, and $4.6 million and $5.0 million for the nine months ended September 30, 2018 and 2017.

As described in Note 1, Boardwalk GP purchased the Partnership’s outstanding Common Units not already owned by Boardwalk GP or its affiliates on July 18, 2018. As a result of this transaction, the Partnership became an indirect and direct wholly-owned subsidiary of BPHC as of July 18, 2018.

Distributions paid to BPHC and Boardwalk GP were $25.6 million and $13.1 million for the three months ended September 30, 2018 and 2017, and $51.7 million and $39.2 million for the nine months ended September 30, 2018 and 2017. The distribution was impacted by the increase in ownership by Boardwalk GP in the third quarter 2018 as described above and in Note 1.

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Supplemental Disclosure of Cash Flow Information

9 Months Ended

Sep. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosure of Cash Flow Information

Supplemental Disclosure of Cash Flow Information (in millions):

	For the Nine Months Ended September 30,
	2018		2017
Cash paid during the period for:
Interest (net of amount capitalized)	$	124.9	$	125.8
Non-cash adjustments:
Accounts payable and property, plant and equipment	51.9		66.6

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Guarantee of Securities of Subsidiaries

9 Months Ended

Sep. 30, 2018

Condensed Financial Information Disclosure [Abstract]

Guarantee of Securities of Subsidiaries

Guarantee of Securities of Subsidiaries

Boardwalk Pipelines (Subsidiary Issuer) has issued securities which have been fully and unconditionally guaranteed by the Partnership (Parent Guarantor). The Subsidiary Issuer is 100% owned by the Parent Guarantor. The Partnership's subsidiaries had no significant restrictions on their ability to pay distributions or make loans to the Partnership except as noted in the debt covenants and had no restricted assets at September 30, 2018, and December 31, 2017. Note 8 contains additional information regarding the Partnership's debt and related covenants.

The Partnership has provided the following condensed consolidating financial information in accordance with Regulation S-X Rule 3-10, Financial Statements of Guarantors and Issuers of Guaranteed Securities Registered or Being Registered.

Condensed Consolidating Balance Sheets as of September 30, 2018

(Millions)

Assets	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	0.2	$	15.6	$	11.2	$	—		$	27.0
Receivables	—		—		122.3		—			122.3
Receivables - affiliate	—		—		6.7		(6.7		)	—
Costs recoverable from customers	—		—		11.1		—			11.1
Prepayments	0.1		—		25.8		—			25.9
Advances to affiliates	—		15.3		2.1		(17.4		)	—
Other current assets	—		—		12.4		(3.2		)	9.2
Total current assets	0.3		30.9		191.6		(27.3		)	195.5
Investment in consolidated subsidiaries	2,790.0		6,653.9		—		(9,443.9		)	—
Property, plant and equipment, gross	0.6		—		11,210.9		—			11,211.5
Less–accumulated depreciation    and amortization	0.6		—		2,862.7		—			2,863.3
Property, plant and equipment, net	—		—		8,348.2		—			8,348.2
Advances to affiliates – noncurrent	2,042.4		864.1		410.7		(3,317.2		)	—
Other noncurrent assets	0.1		2.6		454.4		0.5			457.6
Total other assets	2,042.5		866.7		865.1		(3,316.7		)	457.6
Total Assets	$	4,832.8	$	7,551.5	$	9,404.9	$	(12,787.9	)	$	9,001.3

Liabilities and Partners' Capital	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.2	$	0.1	$	83.4	$	—		$	83.7
Payable to affiliates	1.6		—		6.7		(6.7		)	1.6
Advances from affiliates	—		2.1		15.3		(17.4		)	—
Other current liabilities	—		26.7		163.5		(2.7		)	187.5
Total current liabilities	1.8		28.9		268.9		(26.8		)	272.8
Long-term debt and capital lease     obligation	—		2,279.3		1,395.9		—			3,675.2
Advances from affiliates - noncurrent	—		2,453.1		864.1		(3,317.2		)	—
Other noncurrent liabilities	—		0.2		222.1		—			222.3
Total other liabilities and deferred     credits	—		2,453.3		1,086.2		(3,317.2		)	222.3
Total partners' capital	4,831.0		2,790.0		6,653.9		(9,443.9		)	4,831.0
Total Liabilities and Partners' Capital	$	4,832.8	$	7,551.5	$	9,404.9	$	(12,787.9	)	$	9,001.3

Condensed Consolidating Balance Sheets as of December 31, 2017

(Millions)

Assets	Parent  Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	0.3	$	4.6	$	12.7	$	—		$	17.6
Receivables	—		—		133.4		—			133.4
Receivables - affiliate	—		—		7.0		(7.0		)	—
Prepayments	0.1		—		17.8		—			17.9
Advances to affiliates	—		—		2.3		(2.3		)	—
Other current assets	—		—		13.5		(1.8		)	11.7
Total current assets	0.4		4.6		186.7		(11.1		)	180.6
Investment in consolidated subsidiaries	2,672.3		6,676.7		—		(9,349.0		)	—
Property, plant and equipment, gross	0.6		—		10,883.0		—			10,883.6
Less–accumulated depreciation    and amortization	0.6		—		2,620.5		—			2,621.1
Property, plant and equipment, net	—		—		8,262.5		—			8,262.5
Advances to affiliates – noncurrent	2,070.1		923.7		376.5		(3,370.3		)	—
Other noncurrent assets	—		3.3		460.5		(0.3		)	463.5
Total other assets	2,070.1		927.0		837.0		(3,370.6		)	463.5
Total Assets	$	4,742.8	$	7,608.3	$	9,286.2	$	(12,730.7	)	$	8,906.6

Liabilities and Partners' Capital	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.5	$	0.1	$	87.3	$	—		$	87.9
Payable to affiliates	1.5		—		7.0		(7.0		)	1.5
Advances from affiliates	—		2.3		—		(2.3		)	—
Other current liabilities	—		25.2		167.9		(2.1		)	191.0
Total current liabilities	2.0		27.6		262.2		(11.4		)	280.4
Long-term debt and capital lease     obligation	—		2,461.8		1,225.0		—			3,686.8
Payable to affiliate - noncurrent	16.0		—		—		—			16.0
Advances from affiliates - noncurrent	—		2,446.6		923.7		(3,370.3		)	—
Other noncurrent liabilities	—		—		198.6		—			198.6
Total other liabilities and deferred     credits	16.0		2,446.6		1,122.3		(3,370.3		)	214.6
Total partners' capital	4,724.8		2,672.3		6,676.7		(9,349.0		)	4,724.8
Total Liabilities and Partners' Capital	$	4,742.8	$	7,608.3	$	9,286.2	$	(12,730.7	)	$	8,906.6

Condensed Consolidating Statements of Income for the Three Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	266.5		$	(20.7	)	$	245.8
Storage, parking and lending	—			—			21.1			—			21.1
Other	—			—			11.0			—			11.0
Total operating revenues	—			—			298.6			(20.7		)	277.9
Operating Costs and Expenses:
Fuel and transportation	—			—			24.2			(20.7		)	3.5
Operation and maintenance	—			—			46.9			—			46.9
Administrative and general	(0.1		)	—			32.9			—			32.8
Other operating costs and expenses	0.1			—			113.8			—			113.9
Total operating costs and expenses	—			—			217.8			(20.7		)	197.1
Operating income	—			—			80.8			—			80.8
Other Deductions (Income):
Interest expense	—			29.2			14.3			—			43.5
Interest (income) expense - affiliates, net	(17.5		)	14.0			3.5			—			—
Equity in earnings of subsidiaries	(20.4		)	(63.6		)	—			84.0			—
Miscellaneous other income, net	—			—			(0.7		)	—			(0.7		)
Total other (income) deductions	(37.9		)	(20.4		)	17.1			84.0			42.8
Income (loss) before income taxes	37.9			20.4			63.7			(84.0		)	38.0
Income taxes	—			—			0.1			—			0.1
Net income (loss)	$	37.9		$	20.4		$	63.6		$	(84.0	)	$	37.9

Condensed Consolidating Statements of Income for the Three Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	288.9		$	(22.5	)	$	266.4
Storage, parking and lending	—			—			23.2			—			23.2
Other	—			—			10.9			—			10.9
Total operating revenues	—			—			323.0			(22.5		)	300.5
Operating Costs and Expenses:
Fuel and transportation	—			—			31.5			(22.5		)	9.0
Operation and maintenance	—			—			49.0			—			49.0
Administrative and general	(0.3		)	—			27.4			—			27.1
Other operating costs and expenses	0.4			—			105.0			—			105.4
Total operating costs and expenses	0.1			—			212.9			(22.5		)	190.5
Operating (loss) income	(0.1		)	—			110.1			—			110.0
Other Deductions (Income):
Interest expense	—			32.2			8.8			—			41.0
Interest (income) expense - affiliates, net	(12.4		)	11.0			1.4			—			—
Equity in earnings of subsidiaries	(57.5		)	(100.7		)	—			158.2			—
Miscellaneous other income, net	—			—			(1.1		)	—			(1.1		)
Total other (income) deductions	(69.9		)	(57.5		)	9.1			158.2			39.9
Income (loss) before income taxes	69.8			57.5			101.0			(158.2		)	70.1
Income taxes	—			—			0.3			—			0.3
Net income (loss)	$	69.8		$	57.5		$	100.7		$	(158.2	)	$	69.8

Condensed Consolidating Statements of Income for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	854.7		$	(61.9	)	$	792.8
Storage, parking and lending	—			—			68.1			(0.3		)	67.8
Other	—			—			38.0			—			38.0
Total operating revenues	—			—			960.8			(62.2		)	898.6
Operating Costs and Expenses:
Fuel and transportation	—			—			74.2			(62.2		)	12.0
Operation and maintenance	—			—			144.2			—			144.2
Administrative and general	(0.2		)	—			100.8			—			100.6
Other operating costs and expenses	0.3			—			334.3			—			334.6
Total operating costs and expenses	0.1			—			653.5			(62.2		)	591.4
Operating (loss) income	(0.1		)	—			307.3			—			307.2
Other Deductions (Income):
Interest expense	—			91.8			39.1			—			130.9
Interest (income) expense - affiliates, net	(49.3		)	38.1			11.2			—			—
Interest income	—			—			(0.1		)	—			(0.1		)
Equity in earnings of subsidiaries	(128.1		)	(258.0		)	—			386.1			—
Miscellaneous other income, net	—			—			(1.3		)	—			(1.3		)
Total other (income) deductions	(177.4		)	(128.1		)	48.9			386.1			129.5
Income (loss) before income taxes	177.3			128.1			258.4			(386.1		)	177.7
Income taxes	—			—			0.4			—			0.4
Net income (loss)	$	177.3		$	128.1		$	258.0		$	(386.1	)	$	177.3

Condensed Consolidating Statements of Income for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	918.3		$	(66.3	)	$	852.0
Storage, parking and lending	—			—			80.0			(0.2		)	79.8
Other	—			—			53.3			—			53.3
Total operating revenues	—			—			1,051.6			(66.5		)	985.1
Operating Costs and Expenses:
Fuel and transportation	—			—			109.2			(66.5		)	42.7
Operation and maintenance	—			—			141.0			—			141.0
Administrative and general	(0.3		)	—			97.2			—			96.9
Other operating costs and expenses	0.5			—			363.0			—			363.5
Total operating costs and expenses	0.2			—			710.4			(66.5		)	644.1
Operating (loss) income	(0.2		)	—			341.2			—			341.0
Other Deductions (Income):
Interest expense	—			97.6			33.5			—			131.1
Interest (income) expense - affiliates, net	(34.6		)	30.1			4.5			—			—
Interest income	—			(0.2		)	(0.1		)	—			(0.3		)
Equity in earnings of subsidiaries	(178.4		)	(305.9		)	—			484.3			—
Miscellaneous other income, net	—			—			(3.5		)	—			(3.5		)
Total other (income) deductions	(213.0		)	(178.4		)	34.4			484.3			127.3
Income (loss) before income taxes	212.8			178.4			306.8			(484.3		)	213.7
Income taxes	—			—			0.9			—			0.9
Net income (loss)	$	212.8		$	178.4		$	305.9		$	(484.3	)	$	212.8

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	37.9		$	20.4		$	63.6		$	(84.0	)	$	37.9
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	0.2			0.2			0.1			(0.3		)	0.2
Pension and other postretirement     benefit costs	(0.1		)	(0.1		)	(0.1		)	0.2			(0.1		)
Total Comprehensive Income (Loss)	$	38.0		$	20.5		$	63.6		$	(84.1	)	$	38.0

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended September 30, 2017

(Millions)

	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	69.8	$	57.5	$	100.7	$	(158.2	)	$	69.8
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	0.6		0.6		0.2		(0.8		)	0.6
Pension and other postretirement     benefit costs	0.1		0.1		0.1		(0.2		)	0.1
Total Comprehensive Income (Loss)	$	70.5	$	58.2	$	101.0	$	(159.2	)	$	70.5

Condensed Consolidating Statements of Comprehensive Income for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	177.3	$	128.1	$	258.0	$	(386.1	)	$	177.3
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	1.0		1.0		0.5		(1.5		)	1.0
Pension and other postretirement     benefit costs	1.4		1.4		1.4		(2.8		)	1.4
Total Comprehensive Income (Loss)	$	179.7	$	130.5	$	259.9	$	(390.4	)	$	179.7

Condensed Consolidating Statements of Comprehensive Income for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	212.8		$	178.4		$	305.9	$	(484.3	)	$	212.8
Other comprehensive income (loss):
(Loss) gain on cash flow hedge	(1.5		)	(1.5		)	—		1.5			(1.5		)
Reclassification adjustment transferred     to Net income from cash flow hedges	1.9			1.9			0.5		(2.4		)	1.9
Pension and other postretirement     benefit costs	0.8			0.8			0.8		(1.6		)	0.8
Total Comprehensive Income (Loss)	$	214.0		$	179.6		$	307.2	$	(486.8	)	$	214.0

Condensed Consolidating Statements of Cash Flow for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary  Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net cash provided by (used in)     operating activities	$	48.8		$	(124.6	)	$	531.1		$	—		$	455.3
INVESTING ACTIVITIES:
Capital expenditures	—			—			(354.8		)	—			(354.8		)
Proceeds from sale of operating assets	—			—			0.9			—			0.9
Advances to affiliates, net	27.7			44.3			(303.7		)	231.7			—
Net cash provided by (used in)     investing activities	27.7			44.3			(657.6		)	231.7			(353.9		)
FINANCING ACTIVITIES:
Repayment of borrowings from long-term debt	—			(185.0		)	—			—			(185.0		)
Proceeds from borrowings on revolving     credit agreement	—			—			525.0			—			525.0
Repayment of borrowings on revolving     credit agreement	—			—			(355.0		)	—			(355.0		)
Principal payment of capital lease     obligation	—			—			(0.4		)	—			(0.4		)
Advances from affiliates, net	0.1			276.3			(44.6		)	(231.7		)	0.1
Distributions paid	(76.7		)	—			—			—			(76.7		)
Net cash (used in) provided by     financing activities	(76.6		)	91.3			125.0			(231.7		)	(92.0		)
(Decrease) increase in cash and cash   equivalents	(0.1		)	11.0			(1.5		)	—			9.4
Cash and cash equivalents at   beginning of period	0.3			4.6			12.7			—			17.6
Cash and cash equivalents at     end of period	$	0.2		$	15.6		$	11.2		$	—		$	27.0

Condensed Consolidating Statements of Cash Flow for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net cash provided by (used in)     operating activities	$	33.8		$	(117.0	)	$	586.4		$	—		$	503.2
INVESTING ACTIVITIES:
Capital expenditures	—			—			(496.0		)	—			(496.0		)
Proceeds from sale of operating assets	—			—			63.7			—			63.7
Advances to affiliates, net	42.6			(398.5		)	(377.4		)	733.3			—
Net cash provided by (used in)     investing activities	42.6			(398.5		)	(809.7		)	733.3			(432.3		)
FINANCING ACTIVITIES:
Proceeds from long-term debt, net of     issuance cost	—			494.0			—			—			494.0
Repayment of borrowings from long-term     debt	—			(300.0		)	(275.0		)	—			(575.0		)
Proceeds from borrowings on revolving     credit agreement	—			—			505.0			—			505.0
Repayment of borrowings on revolving     credit agreement	—			—			(400.0		)	—			(400.0		)
Principal payment of capital lease     obligation	—			—			(0.3		)	—			(0.3		)
Advances from affiliates, net	0.1			334.8			398.5			(733.3		)	0.1
Distributions paid	(76.7		)	—			—			—			(76.7		)
Net cash (used in) provided by     financing activities	(76.6		)	528.8			228.2			(733.3		)	(52.9		)
(Decrease) increase in cash and cash     equivalents	(0.2		)	13.3			4.9			—			18.0
Cash and cash equivalents at     beginning of period	0.6			1.8			2.2			—			4.6
Cash and cash equivalents at     end of period	$	0.4		$	15.1		$	7.1		$	—		$	22.6

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Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Accounting, Policy

The accompanying unaudited condensed consolidated financial statements of the Partnership were prepared pursuant to the rules and regulations of the SEC. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) have been condensed or omitted pursuant to such rules and regulations. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments (consisting of only normal recurring accruals) necessary to present fairly the Partnership's financial position as of September 30, 2018, and December 31, 2017, and its results of operations and comprehensive income for the three and nine months ended September 30, 2018 and 2017, and changes in cash flows and changes in partners' capital for the nine months ended September 30, 2018 and 2017. Reference is made to the Notes to the Consolidated Financial Statements in the Partnership's Annual Report on Form 10-K for the year ended December 31, 2017 (2017 Annual Report on Form 10-K), which should be read in conjunction with these unaudited condensed consolidated financial statements. The accounting policies described in Note 2 of Part II, Item 8 of the Partnership's 2017 Annual Report on Form 10-K are the same used in preparing the accompanying unaudited condensed consolidated financial statements, except for the changes described in Note 2 below.Certain amounts reported within Total operating revenues for the 2017 period have been reclassified to conform to the current presentation as a result of changes in accounting policies from the implementation of Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers, which was codified in Accounting Standards Codification (ASC) Topic 606 (ASC 606) further described below. The effect of the reclassification decreased Transportation revenues and increased Other revenues by $6.5 million and $18.2 million for the three and nine months ended September 30, 2017. Additionally, Storage, parking and lending (PAL) revenues are now reported combined. These reclassifications and combinations had no impact on Total operating revenues, Operating income or Net income. Net income for interim periods may not necessarily be indicative of results for the full year.

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Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Revenue Recognition, Policy

Revenue Recognition

Nature of Contracts

The Partnership primarily earns revenues from contracts with customers by providing transportation and storage services for natural gas and NGLs on a firm and interruptible basis. The Partnership also provides interruptible natural gas PAL services. The Partnership’s customers choose, based upon their particular needs, the applicable mix of services depending upon availability of pipeline and storage capacity, the price of services and the volume and timing of customer requirements. The maximum rates that may be charged by the majority of the Partnership’s operating subsidiaries are established through the Federal Energy Regulatory Commission's (FERC) cost-based rate-making process; however, rates actually charged by those operating subsidiaries may be less than those allowed by the FERC. Under the FERC regulations, certain revenues that the Partnership's subsidiaries collect may be subject to possible refunds to customers. Accordingly, during a rate case, estimated refund liabilities are recorded considering regulatory proceedings, advice of counsel and estimated risk-adjusted total exposure, as well as other factors. The Partnership's service contracts can range from one to twenty years although the Partnership may enter into shorter- or longer-term contracts, and services are invoiced monthly with payment from the customer generally expected within ten to thirty days, depending on the terms of the contract.

Firm Service Contracts: The Partnership offers firm services to its customers. The Partnership’s customers can reserve a specific amount of pipeline capacity at specified receipt and delivery points on the Partnership’s pipeline system (transportation service) or can reserve a specific amount of storage capacity at specified injection and withdrawal points at the Partnership’s storage facilities (storage service). The Partnership accounts for firm services as a single promise to stand ready each month of the contract term to provide the committed capacity for either transportation or storage services when needed by the customer, which represents a series of distinct monthly services that are substantially the same with the same pattern of transfer to the customer. Although several activities may be required to provide the firm service, the individual activities do not represent distinct performance obligations because all of the activities must be performed in combination in order for the Partnership to provide the firm service.

The transaction price for firm service contracts is comprised of a fixed fee based on the quantity of capacity reserved, regardless of use (capacity reservation fee), plus variable fees in the form of a usage fee paid on the volume of commodity actually transported or injected and withdrawn from storage. Both the fixed and usage fees are allocated to the single performance obligation of providing transportation or storage service and recognized over time based upon the output measure of time as the Partnership completes its stand-ready obligation to provide contracted capacity and the customer receives and consumes the benefit of the reserved capacity, which corresponds with the transfer of control to the customer. The fixed fee is recognized ratably over the contract term, representative of the proportion of the committed stand-ready capacity obligation that has been fulfilled to date, and the usage fee is recognized upon satisfaction of each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the stand-ready obligation in a given month. Capacity reservation revenues derived from a firm service contract are generally consistent during the contract term, but can be higher in winter periods than the rest of the year based upon seasonal rates.

Interruptible Service Contracts: In providing interruptible services to customers, the Partnership agrees to transport natural gas or NGLs for a customer when capacity is available. The Partnership does not account for interruptible services with a customer as a contract until the customer nominates for service and the Partnership accepts the nomination based upon available pipeline or storage capacity because there are no enforceable rights and obligations until that time. The nomination and acceptance process is a daily activity and acceptance is granted based upon priority of service and availability of capacity. Upon acceptance, the Partnership accounts for interruptible services similarly to its firm services.

The transaction price for interruptible service contracts is comprised of a variable fee in the form of a usage fee paid on the volume of commodity actually transported or injected and withdrawn from storage. The usage fee is allocated to the single performance obligation of providing interruptible service. Interruptible service revenues are generally recognized over time based on the output measure of volume transported or stored when services are rendered upon the successful allocation of the services provided to the customer’s account, which best depicts the transfer of control to the customer and satisfaction of the promised service. Interruptible services are recognized in the month services are provided because the Partnership has a right to consideration from customers in amounts that correspond directly to the value that the customer receives from the Partnership's performance. The rates charged may vary on a daily, monthly or seasonal basis.

Minimum Volume Commitment (MVC) Contracts: Certain of the Partnership’s transportation or storage contracts require customers to transport or store a minimum volume of commodity over a specified time period. If a customer fails to meet its MVC for the specified time period, the customer is obligated to pay a contractually-determined deficiency fee based upon the shortfall between the actual volumes transported or stored and the MVC for that period. MVC contracts are similar in nature to a firm service contract where the performance obligation is a stand-ready obligation that is a series of distinct services that are substantially the same with the same pattern of transfer to the customer. The transaction price for an MVC is a fee for the volume of commodity actually transported or stored, which is allocated to each distinct monthly performance obligation, consistent with the allocation objective and based upon the level of effort required to satisfy the obligation of the transacted service in a given month. Revenues are generally recognized over time based on the output measure of volume transported or stored, with the recognition of the deficiency fee in the period when it is known the customer cannot make up the deficient volume in the specified period.

Other: Periodically, the Partnership may enter into contracts with customers for the sale of natural gas or NGLs. The Partnership recognizes revenues for these transactions at the point in time of the physical sale of the commodity, which corresponds with the transfer of control of the commodity to the customer and the consideration is measured as the stated sales price in the contract.

Contract Balances

The Partnership records contract assets primarily related to performance obligations completed but not billed as of the reporting date. The Partnership records contract liabilities, or deferred income, when payment is received in advance of satisfying its performance obligations.

New Accounting Pronouncements, Policy

Accounting Pronouncements Adopted in 2018 - Retirement Benefits

In March 2017, the FASB issued ASU 2017-07, Retirement Benefits - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (ASU 2017-07), which required entities to retroactively present the service cost component of net periodic postretirement benefit cost with other employee compensation costs in the income statement and present all other net periodic pension costs as a component of non-operating income. Effective January 1, 2018, the Partnership implemented ASU 2017-07 and reclassified $0.8 million and $1.8 million of other components of net periodic benefit cost for the three and nine months ended September 30, 2017, which resulted in an increase to Miscellaneous other income, net and Administrative and general expense in the Condensed Consolidated Statements of Income, with no impact on Net income.

Other Recently Issued Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) (ASU 2016-02), which will require, among other things, the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current GAAP. The amendments are to be applied at the beginning of the earliest period presented using a modified retrospective approach, but include an elective transition method that allows entities to initially apply the updated guidance as of the adoption date. The Partnership has elected to apply this elective transition method. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018. The Partnership is progressing with its project to evaluate the impact that ASU 2016-02 will have on its financial statements when implemented. ASU 2016-02 contains a practical expedient package, under which all criteria must be applied to all of its leases. The practical expedient package allows an entity to (i) not reassess whether expired or existing contracts are or contain leases; (ii) not reassess the lease classification for any expired or existing leases; and (iii) not reassess initial direct costs for any existing leases. The Partnership has elected to apply the practical expedient package to all of its leases.Accounting Pronouncements Adopted in 2018 - Revenue Recognition

In May 2014, the Financial Accounting Standards Board (FASB) issued ASC 606. ASC 606 supersedes the revenue recognition requirements in ASC Topic 605, Revenue Recognition (ASC 605), and requires the recognition of revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services.

Effective January 1, 2018, the Partnership implemented ASC 606 using the modified retrospective method, without adjustment to the comparative period information, which remains reported under ASC 605. Upon implementation, the Partnership recorded a cumulative reduction to partners’ capital of $12.8 million resulting from two items: (i) contracts which had changes to rates during the service period without corresponding changes in service levels provided by the Partnership, with an offsetting increase to other liabilities of $6.4 million, and (ii) the de-recognition of excess fuel received from customers which elected to have fuel retained in-kind, with an offsetting decrease to current gas stored underground of $6.4 million. Upon the implementation of ASC 606, most retained fuel was not considered additional consideration included in the transaction price. As a result, retained fuel is recorded as a reduction to fuel and transportation expense and will be recognized as Other revenue upon the physical sale of natural gas, when under ASC 605, fuel retained was recognized as part of Transportation revenue. The Partnership elected to apply ASC 606 to contracts with customers, and applicable amendments, which were not completed prior to the implementation date.

The following table summarizes the effect on the Partnership’s condensed consolidated financial statements as of September 30, 2018, and for the three and nine months ended September 30, 2018, (in millions) had ASC 606 not been implemented on January 1, 2018:

	As Reported September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Balance Sheet:
Other current assets (gas stored underground)	$	0.4	$	4.0		$	4.4
Gas stored underground	81.7		0.3			82.0
Other assets	138.5		(0.1		)	138.4
Other liabilities	76.0		(8.1		)	67.9
Partners' Capital	4,831.0		12.2			4,843.2

	As Reported For the Three Months Ended September 30, 2018		Adjustments		Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	245.8	$	5.5	$	251.3
Storage, parking and lending	21.1		0.1		21.2
Other	11.0		0.1		11.1
Total operating revenues	277.9		5.7		283.6
Fuel and transportation expense	3.5		4.6		8.1
Operating income	80.8		1.0		81.8
Net income	37.9		1.0		38.9

	As Reported For the Nine Months Ended September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	792.8	$	17.5		$	810.3
Storage, parking and lending	67.8		0.3			68.1
Other	38.0		(4.5		)	33.5
Total operating revenues	898.6		13.3			911.9
Fuel and transportation expense	12.0		13.8			25.8
Operating income	307.2		(0.6		)	306.6
Net income	177.3		(0.6		)	176.7

The implementation of ASC 606 had no impact on the total operating, financing or investing activities of the Partnership’s Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2018.

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Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables (Policies)	9 Months Ended
	Sep. 30, 2018
Gas Balancing Arrangements [Abstract]
Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables, Policy	The operating subsidiaries of the Partnership provide storage services whereby they store natural gas or NGLs on behalf of customers and also periodically hold customer gas under PAL services. Since the customers retain title to the gas held by the Partnership in providing these services, the Partnership does not record the related gas on its balance sheet.

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Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements (Policies)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments, Policy

Financial Assets and Liabilities

The following methods and assumptions were used in estimating the fair value amounts included in the disclosures for financial assets and liabilities, which are consistent with those disclosed in the 2017 Annual Report on Form 10-K:

Cash and Cash Equivalents: For cash and short-term financial assets, the carrying amount is a reasonable estimate of fair value due to the short maturity of those instruments.

Long-Term Debt: The estimated fair value of the Partnership's publicly traded debt is based on quoted market prices at September 30, 2018, and December 31, 2017. The fair market value of the debt that is not publicly traded is based on market prices of similar debt at September 30, 2018, and December 31, 2017. The carrying amount of the Partnership's variable-rate debt at September 30, 2018, and December 31, 2017, approximated fair value.

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Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The following table summarizes the effect on the Partnership’s condensed consolidated financial statements as of September 30, 2018, and for the three and nine months ended September 30, 2018, (in millions) had ASC 606 not been implemented on January 1, 2018:

	As Reported September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Balance Sheet:
Other current assets (gas stored underground)	$	0.4	$	4.0		$	4.4
Gas stored underground	81.7		0.3			82.0
Other assets	138.5		(0.1		)	138.4
Other liabilities	76.0		(8.1		)	67.9
Partners' Capital	4,831.0		12.2			4,843.2

	As Reported For the Three Months Ended September 30, 2018		Adjustments		Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	245.8	$	5.5	$	251.3
Storage, parking and lending	21.1		0.1		21.2
Other	11.0		0.1		11.1
Total operating revenues	277.9		5.7		283.6
Fuel and transportation expense	3.5		4.6		8.1
Operating income	80.8		1.0		81.8
Net income	37.9		1.0		38.9

	As Reported For the Nine Months Ended September 30, 2018		Adjustments			Balance as if ASC  605 was in effect
Condensed Consolidated Income Statement:
Transportation	$	792.8	$	17.5		$	810.3
Storage, parking and lending	67.8		0.3			68.1
Other	38.0		(4.5		)	33.5
Total operating revenues	898.6		13.3			911.9
Fuel and transportation expense	12.0		13.8			25.8
Operating income	307.2		(0.6		)	306.6
Net income	177.3		(0.6		)	176.7

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Revenues (Tables)

9 Months Ended

Sep. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents the Partnership's revenues disaggregated by type of service for the three and nine months ended September 30, 2018 (in millions):

	For the Three Months Ended September 30, 2018		For the Nine Months Ended September 30, 2018
Revenues from Contracts with Customers
Firm Service (1)	$	264.5	$	850.9
Interruptible Service	7.7		25.0
Other revenues	1.2		9.7
Total revenues from contracts with customers	273.4		885.6
Other operating revenues(2)	4.5		13.0
Total Operating Revenues	$	277.9	$	898.6

(1) Revenues earned from contracts with MVCs are included in firm service given the stand-ready nature of the performance obligation and the guaranteed nature of the fees over the contract term.

(2) Other operating revenues include certain revenues earned from operating leases, pipeline management fees and other activities that are not considered central and ongoing major business operations of the Partnership and do not represent revenues earned from contracts with customers.

Contract with Customer, Asset and Liability

Significant changes in the contract liabilities balances during the nine months ended September 30, 2018, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2017	$	1.9
Cumulative effect adjustment from the implementation of     ASC 606	6.4
Revenues recognized that were included in the contract liability     balance at the beginning of the period	(2.3		)
Increases due to cash received, excluding amounts recognized as     revenues during the period	3.1
Balance as of September 30, 2018	$	9.1

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

	As of September 30, 2018 (in millions)
	2018 (1)		2019		Thereafter		Total
Estimated revenues from contracts with customers    from unsatisfied performance obligations as of    September 30, 2018	$	1,065.0	$	1,038.0	$	7,630.0	$	9,733.0
Operating revenues which are fixed and     determinable (operating leases)	13.5		18.0		230.5		262.0
Total projected operating revenues under committed     firm agreements	$	1,078.5	$	1,056.0	$	7,860.5	$	9,995.0

(1)

For the 2018 period, $797.0 million represents actual fixed fee revenues recognized for the fulfillment of performance obligations during the nine months ended September 30, 2018.

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Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements Financial Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping

The carrying amounts and estimated fair values of the Partnership's financial assets and liabilities which were not recorded at fair value on the Condensed Consolidated Balance Sheets as of September 30, 2018, and December 31, 2017, were as follows (in millions):

As of September 30, 2018				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	27.0		$	27.0	$	—	$	—	$	27.0
Financial Liabilities
Long-term debt	$	3,675.1	(1)	$	—	$	3,731.1	$	—	$	3,731.1

(1) The carrying amount of long-term debt excludes a $7.6 million long-term capital lease obligation and

$7.5 million of unamortized debt issuance costs.

As of December 31, 2017				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.6		$	17.6	$	—	$	—	$	17.6
Financial Liabilities
Long-term debt	$	3,687.5	(1)	$	—	$	3,889.4	$	—	$	3,889.4

(1) The carrying amount of long-term debt excludes an $8.1 million long-term capital lease obligation and

$8.8 million of unamortized debt issuance costs.

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Financing (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

During the nine months ended September 30, 2017, the Partnership completed the following debt issuance (in millions, except interest rates):

Date of Issuance	Issuing Subsidiary	Amount of  Issuance		Purchaser Discounts and Expenses		Net Proceeds			Interest Rate	Maturity Date	Interest Payable
January 2017	Boardwalk Pipelines	$	500.0	$	6.0	$	494.0	(1)	4.45%	July 15, 2027	January 15 and July 15

(1) The net proceeds of this offering were used to retire the outstanding $275.0 million aggregate principal amount of Gulf South Pipeline Company, LP's 6.30% notes due 2017 and to fund growth capital expenditures.

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Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the three months ended September 30, 2018 and 2017, were as follows (in millions):

	Retirement Plans						PBOP
	For the Three Months Ended September 30,						For the Three Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	0.7		$	0.8		$	—		$	—
Interest cost	1.2			1.2			0.4			0.4
Expected return on plan assets	(1.7		)	(2.0		)	(1.2		)	(1.1		)
Amortization of unrecognized net loss	0.3			0.4			—			—
Settlement charge	0.4			0.4			—			—
Net periodic benefit cost	$	0.9		$	0.8		$	(0.8	)	$	(0.7	)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2018 and 2017, were as follows (in millions):

	Retirement Plans						PBOP
	For the Nine Months Ended September 30,						For the Nine Months Ended September 30,
	2018			2017			2018			2017
Service cost	$	2.5		$	2.6		$	0.1		$	0.1
Interest cost	3.4			3.5			1.1			1.2
Expected return on plan assets	(5.7		)	(5.9		)	(3.5		)	(3.3		)
Amortization of unrecognized net loss	1.1			1.3			—			—
Settlement charge	2.6			1.5			—			—
Net periodic benefit cost	$	3.9		$	3.0		$	(2.3	)	$	(2.0	)

The components of net periodic benefit cost, other than the service cost component, are included in Miscellaneous other income, net and the service cost component is included in Administrative and general on the Condensed Consolidated Statements of Income.

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Supplemental Disclosure of Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental Disclosure of Cash Flow Information (in millions):

	For the Nine Months Ended September 30,
	2018		2017
Cash paid during the period for:
Interest (net of amount capitalized)	$	124.9	$	125.8
Non-cash adjustments:
Accounts payable and property, plant and equipment	51.9		66.6

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Guarantee of Securities of Subsidiaries (Tables)

9 Months Ended

Sep. 30, 2018

Condensed Financial Information Disclosure [Abstract]

Condensed Consolidating Balance Sheet

The Partnership has provided the following condensed consolidating financial information in accordance with Regulation S-X Rule 3-10, Financial Statements of Guarantors and Issuers of Guaranteed Securities Registered or Being Registered.

Condensed Consolidating Balance Sheets as of September 30, 2018

(Millions)

Assets	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	0.2	$	15.6	$	11.2	$	—		$	27.0
Receivables	—		—		122.3		—			122.3
Receivables - affiliate	—		—		6.7		(6.7		)	—
Costs recoverable from customers	—		—		11.1		—			11.1
Prepayments	0.1		—		25.8		—			25.9
Advances to affiliates	—		15.3		2.1		(17.4		)	—
Other current assets	—		—		12.4		(3.2		)	9.2
Total current assets	0.3		30.9		191.6		(27.3		)	195.5
Investment in consolidated subsidiaries	2,790.0		6,653.9		—		(9,443.9		)	—
Property, plant and equipment, gross	0.6		—		11,210.9		—			11,211.5
Less–accumulated depreciation    and amortization	0.6		—		2,862.7		—			2,863.3
Property, plant and equipment, net	—		—		8,348.2		—			8,348.2
Advances to affiliates – noncurrent	2,042.4		864.1		410.7		(3,317.2		)	—
Other noncurrent assets	0.1		2.6		454.4		0.5			457.6
Total other assets	2,042.5		866.7		865.1		(3,316.7		)	457.6
Total Assets	$	4,832.8	$	7,551.5	$	9,404.9	$	(12,787.9	)	$	9,001.3

Liabilities and Partners' Capital	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.2	$	0.1	$	83.4	$	—		$	83.7
Payable to affiliates	1.6		—		6.7		(6.7		)	1.6
Advances from affiliates	—		2.1		15.3		(17.4		)	—
Other current liabilities	—		26.7		163.5		(2.7		)	187.5
Total current liabilities	1.8		28.9		268.9		(26.8		)	272.8
Long-term debt and capital lease     obligation	—		2,279.3		1,395.9		—			3,675.2
Advances from affiliates - noncurrent	—		2,453.1		864.1		(3,317.2		)	—
Other noncurrent liabilities	—		0.2		222.1		—			222.3
Total other liabilities and deferred     credits	—		2,453.3		1,086.2		(3,317.2		)	222.3
Total partners' capital	4,831.0		2,790.0		6,653.9		(9,443.9		)	4,831.0
Total Liabilities and Partners' Capital	$	4,832.8	$	7,551.5	$	9,404.9	$	(12,787.9	)	$	9,001.3

Condensed Consolidating Balance Sheets as of December 31, 2017

(Millions)

Assets	Parent  Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Cash and cash equivalents	$	0.3	$	4.6	$	12.7	$	—		$	17.6
Receivables	—		—		133.4		—			133.4
Receivables - affiliate	—		—		7.0		(7.0		)	—
Prepayments	0.1		—		17.8		—			17.9
Advances to affiliates	—		—		2.3		(2.3		)	—
Other current assets	—		—		13.5		(1.8		)	11.7
Total current assets	0.4		4.6		186.7		(11.1		)	180.6
Investment in consolidated subsidiaries	2,672.3		6,676.7		—		(9,349.0		)	—
Property, plant and equipment, gross	0.6		—		10,883.0		—			10,883.6
Less–accumulated depreciation    and amortization	0.6		—		2,620.5		—			2,621.1
Property, plant and equipment, net	—		—		8,262.5		—			8,262.5
Advances to affiliates – noncurrent	2,070.1		923.7		376.5		(3,370.3		)	—
Other noncurrent assets	—		3.3		460.5		(0.3		)	463.5
Total other assets	2,070.1		927.0		837.0		(3,370.6		)	463.5
Total Assets	$	4,742.8	$	7,608.3	$	9,286.2	$	(12,730.7	)	$	8,906.6

Liabilities and Partners' Capital	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Payables	$	0.5	$	0.1	$	87.3	$	—		$	87.9
Payable to affiliates	1.5		—		7.0		(7.0		)	1.5
Advances from affiliates	—		2.3		—		(2.3		)	—
Other current liabilities	—		25.2		167.9		(2.1		)	191.0
Total current liabilities	2.0		27.6		262.2		(11.4		)	280.4
Long-term debt and capital lease     obligation	—		2,461.8		1,225.0		—			3,686.8
Payable to affiliate - noncurrent	16.0		—		—		—			16.0
Advances from affiliates - noncurrent	—		2,446.6		923.7		(3,370.3		)	—
Other noncurrent liabilities	—		—		198.6		—			198.6
Total other liabilities and deferred     credits	16.0		2,446.6		1,122.3		(3,370.3		)	214.6
Total partners' capital	4,724.8		2,672.3		6,676.7		(9,349.0		)	4,724.8
Total Liabilities and Partners' Capital	$	4,742.8	$	7,608.3	$	9,286.2	$	(12,730.7	)	$	8,906.6

Condensed Consolidating Statements of Income

Condensed Consolidating Statements of Income for the Three Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	266.5		$	(20.7	)	$	245.8
Storage, parking and lending	—			—			21.1			—			21.1
Other	—			—			11.0			—			11.0
Total operating revenues	—			—			298.6			(20.7		)	277.9
Operating Costs and Expenses:
Fuel and transportation	—			—			24.2			(20.7		)	3.5
Operation and maintenance	—			—			46.9			—			46.9
Administrative and general	(0.1		)	—			32.9			—			32.8
Other operating costs and expenses	0.1			—			113.8			—			113.9
Total operating costs and expenses	—			—			217.8			(20.7		)	197.1
Operating income	—			—			80.8			—			80.8
Other Deductions (Income):
Interest expense	—			29.2			14.3			—			43.5
Interest (income) expense - affiliates, net	(17.5		)	14.0			3.5			—			—
Equity in earnings of subsidiaries	(20.4		)	(63.6		)	—			84.0			—
Miscellaneous other income, net	—			—			(0.7		)	—			(0.7		)
Total other (income) deductions	(37.9		)	(20.4		)	17.1			84.0			42.8
Income (loss) before income taxes	37.9			20.4			63.7			(84.0		)	38.0
Income taxes	—			—			0.1			—			0.1
Net income (loss)	$	37.9		$	20.4		$	63.6		$	(84.0	)	$	37.9

Condensed Consolidating Statements of Income for the Three Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	288.9		$	(22.5	)	$	266.4
Storage, parking and lending	—			—			23.2			—			23.2
Other	—			—			10.9			—			10.9
Total operating revenues	—			—			323.0			(22.5		)	300.5
Operating Costs and Expenses:
Fuel and transportation	—			—			31.5			(22.5		)	9.0
Operation and maintenance	—			—			49.0			—			49.0
Administrative and general	(0.3		)	—			27.4			—			27.1
Other operating costs and expenses	0.4			—			105.0			—			105.4
Total operating costs and expenses	0.1			—			212.9			(22.5		)	190.5
Operating (loss) income	(0.1		)	—			110.1			—			110.0
Other Deductions (Income):
Interest expense	—			32.2			8.8			—			41.0
Interest (income) expense - affiliates, net	(12.4		)	11.0			1.4			—			—
Equity in earnings of subsidiaries	(57.5		)	(100.7		)	—			158.2			—
Miscellaneous other income, net	—			—			(1.1		)	—			(1.1		)
Total other (income) deductions	(69.9		)	(57.5		)	9.1			158.2			39.9
Income (loss) before income taxes	69.8			57.5			101.0			(158.2		)	70.1
Income taxes	—			—			0.3			—			0.3
Net income (loss)	$	69.8		$	57.5		$	100.7		$	(158.2	)	$	69.8

Condensed Consolidating Statements of Income for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	854.7		$	(61.9	)	$	792.8
Storage, parking and lending	—			—			68.1			(0.3		)	67.8
Other	—			—			38.0			—			38.0
Total operating revenues	—			—			960.8			(62.2		)	898.6
Operating Costs and Expenses:
Fuel and transportation	—			—			74.2			(62.2		)	12.0
Operation and maintenance	—			—			144.2			—			144.2
Administrative and general	(0.2		)	—			100.8			—			100.6
Other operating costs and expenses	0.3			—			334.3			—			334.6
Total operating costs and expenses	0.1			—			653.5			(62.2		)	591.4
Operating (loss) income	(0.1		)	—			307.3			—			307.2
Other Deductions (Income):
Interest expense	—			91.8			39.1			—			130.9
Interest (income) expense - affiliates, net	(49.3		)	38.1			11.2			—			—
Interest income	—			—			(0.1		)	—			(0.1		)
Equity in earnings of subsidiaries	(128.1		)	(258.0		)	—			386.1			—
Miscellaneous other income, net	—			—			(1.3		)	—			(1.3		)
Total other (income) deductions	(177.4		)	(128.1		)	48.9			386.1			129.5
Income (loss) before income taxes	177.3			128.1			258.4			(386.1		)	177.7
Income taxes	—			—			0.4			—			0.4
Net income (loss)	$	177.3		$	128.1		$	258.0		$	(386.1	)	$	177.3

Condensed Consolidating Statements of Income for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Operating Revenues:
Transportation	$	—		$	—		$	918.3		$	(66.3	)	$	852.0
Storage, parking and lending	—			—			80.0			(0.2		)	79.8
Other	—			—			53.3			—			53.3
Total operating revenues	—			—			1,051.6			(66.5		)	985.1
Operating Costs and Expenses:
Fuel and transportation	—			—			109.2			(66.5		)	42.7
Operation and maintenance	—			—			141.0			—			141.0
Administrative and general	(0.3		)	—			97.2			—			96.9
Other operating costs and expenses	0.5			—			363.0			—			363.5
Total operating costs and expenses	0.2			—			710.4			(66.5		)	644.1
Operating (loss) income	(0.2		)	—			341.2			—			341.0
Other Deductions (Income):
Interest expense	—			97.6			33.5			—			131.1
Interest (income) expense - affiliates, net	(34.6		)	30.1			4.5			—			—
Interest income	—			(0.2		)	(0.1		)	—			(0.3		)
Equity in earnings of subsidiaries	(178.4		)	(305.9		)	—			484.3			—
Miscellaneous other income, net	—			—			(3.5		)	—			(3.5		)
Total other (income) deductions	(213.0		)	(178.4		)	34.4			484.3			127.3
Income (loss) before income taxes	212.8			178.4			306.8			(484.3		)	213.7
Income taxes	—			—			0.9			—			0.9
Net income (loss)	$	212.8		$	178.4		$	305.9		$	(484.3	)	$	212.8

Condensed Consolidating Statements Of Comprehensive Income

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	37.9		$	20.4		$	63.6		$	(84.0	)	$	37.9
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	0.2			0.2			0.1			(0.3		)	0.2
Pension and other postretirement     benefit costs	(0.1		)	(0.1		)	(0.1		)	0.2			(0.1		)
Total Comprehensive Income (Loss)	$	38.0		$	20.5		$	63.6		$	(84.1	)	$	38.0

Condensed Consolidating Statements of Comprehensive Income for the Three Months Ended September 30, 2017

(Millions)

	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	69.8	$	57.5	$	100.7	$	(158.2	)	$	69.8
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	0.6		0.6		0.2		(0.8		)	0.6
Pension and other postretirement     benefit costs	0.1		0.1		0.1		(0.2		)	0.1
Total Comprehensive Income (Loss)	$	70.5	$	58.2	$	101.0	$	(159.2	)	$	70.5

Condensed Consolidating Statements of Comprehensive Income for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor		Subsidiary Issuer		Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	177.3	$	128.1	$	258.0	$	(386.1	)	$	177.3
Other comprehensive income (loss):
Reclassification adjustment transferred     to Net income from cash flow hedges	1.0		1.0		0.5		(1.5		)	1.0
Pension and other postretirement     benefit costs	1.4		1.4		1.4		(2.8		)	1.4
Total Comprehensive Income (Loss)	$	179.7	$	130.5	$	259.9	$	(390.4	)	$	179.7

Condensed Consolidating Statements of Comprehensive Income for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries		Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net income (loss)	$	212.8		$	178.4		$	305.9	$	(484.3	)	$	212.8
Other comprehensive income (loss):
(Loss) gain on cash flow hedge	(1.5		)	(1.5		)	—		1.5			(1.5		)
Reclassification adjustment transferred     to Net income from cash flow hedges	1.9			1.9			0.5		(2.4		)	1.9
Pension and other postretirement     benefit costs	0.8			0.8			0.8		(1.6		)	0.8
Total Comprehensive Income (Loss)	$	214.0		$	179.6		$	307.2	$	(486.8	)	$	214.0

Condensed Consolidating Statements of Cash Flows

Condensed Consolidating Statements of Cash Flow for the Nine Months Ended September 30, 2018

(Millions)

	Parent Guarantor			Subsidiary  Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net cash provided by (used in)     operating activities	$	48.8		$	(124.6	)	$	531.1		$	—		$	455.3
INVESTING ACTIVITIES:
Capital expenditures	—			—			(354.8		)	—			(354.8		)
Proceeds from sale of operating assets	—			—			0.9			—			0.9
Advances to affiliates, net	27.7			44.3			(303.7		)	231.7			—
Net cash provided by (used in)     investing activities	27.7			44.3			(657.6		)	231.7			(353.9		)
FINANCING ACTIVITIES:
Repayment of borrowings from long-term debt	—			(185.0		)	—			—			(185.0		)
Proceeds from borrowings on revolving     credit agreement	—			—			525.0			—			525.0
Repayment of borrowings on revolving     credit agreement	—			—			(355.0		)	—			(355.0		)
Principal payment of capital lease     obligation	—			—			(0.4		)	—			(0.4		)
Advances from affiliates, net	0.1			276.3			(44.6		)	(231.7		)	0.1
Distributions paid	(76.7		)	—			—			—			(76.7		)
Net cash (used in) provided by     financing activities	(76.6		)	91.3			125.0			(231.7		)	(92.0		)
(Decrease) increase in cash and cash   equivalents	(0.1		)	11.0			(1.5		)	—			9.4
Cash and cash equivalents at   beginning of period	0.3			4.6			12.7			—			17.6
Cash and cash equivalents at     end of period	$	0.2		$	15.6		$	11.2		$	—		$	27.0

Condensed Consolidating Statements of Cash Flow for the Nine Months Ended September 30, 2017

(Millions)

	Parent Guarantor			Subsidiary Issuer			Non-guarantor Subsidiaries			Eliminations			Consolidated Boardwalk Pipeline Partners, LP
Net cash provided by (used in)     operating activities	$	33.8		$	(117.0	)	$	586.4		$	—		$	503.2
INVESTING ACTIVITIES:
Capital expenditures	—			—			(496.0		)	—			(496.0		)
Proceeds from sale of operating assets	—			—			63.7			—			63.7
Advances to affiliates, net	42.6			(398.5		)	(377.4		)	733.3			—
Net cash provided by (used in)     investing activities	42.6			(398.5		)	(809.7		)	733.3			(432.3		)
FINANCING ACTIVITIES:
Proceeds from long-term debt, net of     issuance cost	—			494.0			—			—			494.0
Repayment of borrowings from long-term     debt	—			(300.0		)	(275.0		)	—			(575.0		)
Proceeds from borrowings on revolving     credit agreement	—			—			505.0			—			505.0
Repayment of borrowings on revolving     credit agreement	—			—			(400.0		)	—			(400.0		)
Principal payment of capital lease     obligation	—			—			(0.3		)	—			(0.3		)
Advances from affiliates, net	0.1			334.8			398.5			(733.3		)	0.1
Distributions paid	(76.7		)	—			—			—			(76.7		)
Net cash (used in) provided by     financing activities	(76.6		)	528.8			228.2			(733.3		)	(52.9		)
(Decrease) increase in cash and cash     equivalents	(0.2		)	13.3			4.9			—			18.0
Cash and cash equivalents at     beginning of period	0.6			1.8			2.2			—			4.6
Cash and cash equivalents at     end of period	$	0.4		$	15.1		$	7.1		$	—		$	22.6

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Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Jul. 18, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Transportation		$ 245.8	$ 266.4	$ 792.8	$ 852.0
Percent of General Partner Interest Owned by Holding Company (in hundredths)		100.00%		100.00%
General Partner purchase of common units and conversion to partnership interests				$ 0.0
Other		$ 11.0	10.9	38.0	53.3
Accounting Standards Update 2014-09
Transportation		245.8		792.8
Other		11.0		38.0
Restatement Adjustment | Accounting Standards Update 2014-09
Transportation		5.5	(6.5)	17.5	(18.2)
Other		$ 0.1	$ 6.5	(4.5)	$ 18.2
General Partner
Price per share paid to acquire outstanding shares	$ 12.06
General Partner purchase of common units and conversion to partnership interests	$ 1,500.0			$ (94.3)

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Accounting Policies Revenue, Initial Application (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (12.8)
Current Gas Stored Underground Cumulative Effect Decrease	$ 6.4
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (12.8)
Other Liabilities Cumulative Effect Increase		6.4
Current Gas Stored Underground Cumulative Effect Decrease		$ 6.4
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Service Contracts Duration	1 year
Expected Payment of Invoiced Services	10 days
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Service Contracts Duration	20 years
Expected Payment of Invoiced Services	30 days

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Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gas stored underground	$ 81.7		$ 81.7		$ 86.3
Other assets	138.5		138.5		139.8
Other liabilities	76.0		76.0		65.0
Partners' Capital	4,831.0	$ 4,668.2	4,831.0	$ 4,668.2	$ 4,724.8	$ 4,530.9
Transportation revenues	245.8	266.4	792.8	852.0
Storage, parking and lending	21.1	23.2	67.8	79.8
Other	11.0	10.9	38.0	53.3
Total operating revenues	277.9	300.5	898.6	985.1
Fuel and transportation expense	3.5	9.0	12.0	42.7
Operating income	80.8	110.0	307.2	341.0
Net income	37.9	69.8	177.3	212.8
Miscellaneous other income, net	0.7	1.1	1.3	3.5
Administrative and general	32.8	27.1	100.6	96.9
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current assets (gas stored underground)	0.4		0.4
Gas stored underground	81.7		81.7
Other assets	138.5		138.5
Other liabilities	76.0		76.0
Partners' Capital	4,831.0		4,831.0
Transportation revenues	245.8		792.8
Storage, parking and lending	21.1		67.8
Other	11.0		38.0
Total operating revenues	277.9		898.6
Fuel and transportation expense	3.5		12.0
Operating income	80.8		307.2
Net income	37.9		177.3
Accounting Standards Update 2014-09 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current assets (gas stored underground)	4.0		4.0
Gas stored underground	0.3		0.3
Other assets	(0.1)		(0.1)
Other liabilities	(8.1)		(8.1)
Partners' Capital	12.2		12.2
Transportation revenues	5.5	(6.5)	17.5	(18.2)
Storage, parking and lending	0.1		0.3
Other	0.1	6.5	(4.5)	18.2
Total operating revenues	5.7		13.3
Fuel and transportation expense	4.6		13.8
Operating income	1.0		(0.6)
Net income	1.0		(0.6)
Accounting Standards Update 2014-09 | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other current assets (gas stored underground)	4.4		4.4
Gas stored underground	82.0		82.0
Other assets	138.4		138.4
Other liabilities	67.9		67.9
Partners' Capital	4,843.2		4,843.2
Transportation revenues	251.3		810.3
Storage, parking and lending	21.2		68.1
Other	11.1		33.5
Total operating revenues	283.6		911.9
Fuel and transportation expense	8.1		25.8
Operating income	81.8		306.6
Net income	$ 38.9		$ 176.7
Accounting Standards Update 2017-07 | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Miscellaneous other income, net		0.8		1.8
Administrative and general		$ 0.8		$ 1.8

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Revenues Disaggregation of Revenue (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segments	Sep. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments | segments				1
Revenue from Contract with Customer, Excluding Assessed Tax		$ 273.4		$ 885.6
Other operating revenues	[1]	4.5		13.0
Total operating revenues		277.9	$ 300.5	898.6	$ 985.1
Firm Service
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	[2]	264.5		850.9
Interruptible Service
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		7.7		25.0
Other revenues
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 1.2		$ 9.7

[1] Other operating revenues include certain revenues earned from operating leases, pipeline management fees and other activities that are not considered central and ongoing major business operations of the Partnership and do not represent revenues earned from contracts with customers.

[2] Revenues earned from contracts with MVCs are included in firm service given the stand-ready nature of the performance obligation and the guaranteed nature of the fees over the contract term.

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Revenues Contract Balances (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Accounts Receivable, Net	$ 89.4
Contracts with Customers, Asset, Gross, Current	17.1
Contract Liability Balance as of December 31, 2017	1.9
Cumulative effect adjustment from the implementation of ASC 606	6.4
Revenues recognized that were included in the contract liability balance at the beginning of the period	(2.3)
Increases due to cash received, excluding amounts recognized as revenues during the period	3.1
Contract Liability Balance as of September 30, 2018	$ 9.1

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Revenues Performance Obligations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Fixed Fee Revenues Recognized	$ 797.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 months
Estimated revenues from contracts with customers from unsatisfied performance obligations as of September 30, 2018	$ 1,065.0
Operating revenues which are fixed and determinable (operating leases)	13.5
Total projected operating revenues under committed firm agreements	$ 1,078.5	[1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Estimated revenues from contracts with customers from unsatisfied performance obligations as of September 30, 2018	$ 1,038.0
Operating revenues which are fixed and determinable (operating leases)	18.0
Total projected operating revenues under committed firm agreements	$ 1,056.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	23 years
Estimated revenues from contracts with customers from unsatisfied performance obligations as of September 30, 2018	$ 7,630.0
Operating revenues which are fixed and determinable (operating leases)	230.5
Total projected operating revenues under committed firm agreements	7,860.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Estimated revenues from contracts with customers from unsatisfied performance obligations as of September 30, 2018	9,733.0
Operating revenues which are fixed and determinable (operating leases)	262.0
Total projected operating revenues under committed firm agreements	$ 9,995.0

[1] For the 2018 period, $797.0 million represents actual fixed fee revenues recognized for the fulfillment of performance obligations during the nine months ended September 30, 2018.

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Asset Disposition and Impairments (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	May 09, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]
Proceeds from Sale of Property, Plant, and Equipment	$ 63.6
Loss (gain) on sale of assets and impairments	$ 47.1	$ (0.2)	$ 0.0	$ (0.7)	$ 47.1

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Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables (Details) MMBbls in Millions, MMBTU in Millions, $ in Millions	Sep. 30, 2018 USD ($) $ / MMBTU MMBTU MMBbls	Dec. 31, 2017 MMBTU MMBbls
Gas Balancing Arrangements [Abstract]
Gas Balancing Measurement (in MMBtu) | MMBTU	7.9	12.3
Average Market Price of Gas Assumed | $ / MMBTU	2.83
Gas Imbalance to Subsidiaries Asset Liability	$ 22.4
Natural Gas Liquids Balancing Volume (in MMBbls) (Less than) | MMBbls	0.1	0.0
Natural Gas Liquids Imbalance to Subsidiaries Asset Liability	$ 1.1

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Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements AOCI (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ (78.6)	$ (81.0)
Fair Value, Measurements, Recurring
Accumulated Other Comprehensive Income (Loss) [Line Items]
Assets, Fair Value Disclosure, Recurring	0.0	0.0
Liabilities, Fair Value Disclosure, Recurring	0.0	0.0
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cash Flow Hedge Loss to be Reclassified within Twelve Months	0.9
Accumulated other comprehensive income (loss)	$ (4.0)	$ (5.0)

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Accumulated Other Comprehensive Income (AOCI) and Fair Value Measurements Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018		Dec. 31, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents - Fair Value	$ 27.0		$ 17.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,731.1		3,889.4
Capital Lease Obligations, Noncurrent	7.6		8.1
Unamortized Debt Issuance Expense	7.5		8.8
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents - Fair Value	27.0		17.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,675.1	[1]	3,687.5	[2]
Fair Value | Fair Value, Inputs, Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents - Fair Value	27.0		17.6
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	0.0		0.0
Fair Value | Fair Value, Inputs, Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents - Fair Value	0.0		0.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,731.1		3,889.4
Fair Value | Fair Value, Inputs, Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents - Fair Value	0.0		0.0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	$ 0.0		$ 0.0

[1] The carrying amount of long-term debt excludes a $7.6 million long-term capital lease obligation and $7.5 million of unamortized debt issuance costs.

[2] The carrying amount of long-term debt excludes an $8.1 million long-term capital lease obligation and $8.8 million of unamortized debt issuance costs.

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Commitments and Contingencies Commitments for Construction (Details) $ in Millions	Sep. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Commitment, Remaining Minimum Amount Committed	$ 162.5

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Financing - Debt (Details) - USD ($) $ in Millions			1 Months Ended		9 Months Ended
		Jun. 01, 2018	Aug. 31, 2017	Jan. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Nov. 05, 2018	Dec. 31, 2017
Debt Instruments [Abstract]
Repayments of Unsecured Debt					$ 185.0	$ 575.0
Unsecured Debt
Debt Instruments [Abstract]
Long-term Debt, Gross					$ 3,100.0			$ 3,300.0
Debt, Weighted-Average Interest Rate					5.17%			5.18%
Debt Instrument, Face Amount (Issuance)					$ 0.0
Debt Instrument, Covenant Compliance					At September 30, 2018, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.
Unsecured Debt | Boardwalk Pipelines Notes Due 2019
Debt Instruments [Abstract]
Long-term Debt, Gross					$ 350.0
Unsecured Debt | Boardwalk Pipelines 4.45% Notes Due 2027
Debt Instruments [Abstract]
Debt Instrument, Issuance Date				Jan. 31, 2017
Debt Instrument, Face Amount (Issuance)				$ 500.0
Payments of Debt Issuance Costs				6.0
Proceeds from Debt, Net of Issuance Costs	[1]			$ 494.0
Debt Instrument, Interest Rate, Stated Percentage				4.45%
Debt Instrument, Maturity Date				Jul. 15, 2027
Unsecured Debt | Gulf South 6.30% Notes Due 2017
Debt Instruments [Abstract]
Repayments of Unsecured Debt			$ 275.0
Debt Instrument, Interest Rate, Stated Percentage			6.30%
Unsecured Debt | Boardwalk Pipelines Notes Due 2018
Debt Instruments [Abstract]
Repayments of Unsecured Debt		$ 185.0
Debt Instrument, Interest Rate, Stated Percentage		5.20%
Line of Credit
Debt Instruments [Abstract]
Debt, Weighted-Average Interest Rate					3.42%			2.72%
Line of Credit Facility [Abstract]
Long-term Line of Credit					$ 555.0			$ 385.0
Line of Credit Facility, Covenant Compliance					The Partnership and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of September 30, 2018.
Line of Credit | Amendment No. 1 Credit Agreement - 2016
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,500.0
Line of Credit | Amendment No. 2 Credit Agreement - 2017
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,475.0
Subordinated Debt
Debt Instruments [Abstract]
Debt Instrument, Maturity Date					Dec. 31, 2018
Subordinated Loan Agreement Maximum Borrowing Capacity					$ 300.0
Subsequent Event | Subordinated Debt
Debt Instruments [Abstract]
Subordinated Debt							$ 0.0

[1] The net proceeds of this offering were used to retire the outstanding $275.0 million aggregate principal amount of Gulf South Pipeline Company, LP's 6.30% notes due 2017 and to fund growth capital expenditures.

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Financing Financing - Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Capital Unit [Line Items]
Number of common units registered for resale under Amended and Restated Registration Rights Agreement (in number of units)	27.9
Maximum amount Partnership must pay for reimbursement of underwriting discounts and commissions (in dollars per unit)	$ 0.914
Registration Payment Arrangement, Accrual Carrying Value	$ 0.0	$ 16.0

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Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 3.0
Defined Contribution Plan, Cost	2.7	$ 2.7	$ 8.0	$ 8.1
Retirement Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.7	0.8	2.5	2.6
Interest cost	1.2	1.2	3.4	3.5
Expected return on plan assets	(1.7)	(2.0)	(5.7)	(5.9)
Amortization of unrecognized net loss	0.3	0.4	1.1	1.3
Settlement charge	0.4	0.4	2.6	1.5
Net periodic benefit cost	0.9	0.8	3.9	3.0
PBOP
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.0	0.0	0.1	0.1
Interest cost	0.4	0.4	1.1	1.2
Expected return on plan assets	(1.2)	(1.1)	(3.5)	(3.3)
Amortization of unrecognized net loss	0.0	0.0	0.0	0.0
Settlement charge	0.0	0.0	0.0	0.0
Net periodic benefit cost	$ (0.8)	$ (0.7)	$ (2.3)	$ (2.0)

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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 1.6	$ 1.7	$ 4.6	$ 5.0
Boardwalk GP, LP
Related Party Transaction [Line Items]
Cash dividends paid to parent company	$ 25.6	$ 13.1	$ 51.7	$ 39.2

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Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash paid during the period for:
Interest (net of amount capitalized)	$ 124.9	$ 125.8
Non-cash adjustments:
Accounts payable and property, plant and equipment	$ 51.9	$ 66.6

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Guarantee of Securities of Subsidiaries Balance Sheets (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Subsidiary, Cumulative Percentage Ownership after All Transactions	100.00%
Equity Restrictions	$ 0.0	$ 0.0
Other Restricted Assets	$ 0.0	0.0
Restriction to Transfer Funds	Boardwalk Pipelines (Subsidiary Issuer) has issued securities which have been fully and unconditionally guaranteed by the Partnership (Parent Guarantor). The Subsidiary Issuer is 100% owned by the Parent Guarantor. The Partnership's subsidiaries had no significant restrictions on their ability to pay distributions or make loans to the Partnership except as noted in the debt covenants and had no restricted assets at September 30, 2018, and December 31, 2017.
Assets
Cash and cash equivalents	$ 27.0	17.6	$ 22.6	$ 4.6
Receivables	122.3	133.4
Receivables - affiliate	0.0	0.0
Costs recoverable from customers	11.1	0.0
Prepayments	25.9	17.9
Advances to affiliates	0.0	0.0
Other current assets	9.2	11.7
Total current assets	195.5	180.6
Investment in consolidated subsidiaries	0.0	0.0
Property, plant and equipment, gross	11,211.5	10,883.6
Less—accumulated depreciation and amortization	2,863.3	2,621.1
Property, plant and equipment, net	8,348.2	8,262.5
Advances to affiliates - noncurrent	0.0	0.0
Other noncurrent assets	457.6	463.5
Total other assets	457.6	463.5
Total Assets	9,001.3	8,906.6
Liabilities and Partners' Capital
Payables	83.7	87.9
Payable to affiliates	1.6	1.5
Advances from affiliates	0.0	0.0
Other current liabilities	187.5	191.0
Total current liabilities	272.8	280.4
Long-term debt and capital lease obligation	3,675.2	3,686.8
Payable to affiliate - noncurrent	0.0	16.0
Advances from affiliates - noncurrent	0.0	0.0
Other noncurrent liabilities	222.3	198.6
Total other liabilities and deferred credits	222.3	214.6
Total partners' capital	4,831.0	4,724.8
Total Liabilities and Partners' Capital	9,001.3	8,906.6
Reportable Legal Entities | Parent Guarantor
Assets
Cash and cash equivalents	0.2	0.3	0.4	0.6
Receivables	0.0	0.0
Receivables - affiliate	0.0	0.0
Costs recoverable from customers	0.0
Prepayments	0.1	0.1
Advances to affiliates	0.0	0.0
Other current assets	0.0	0.0
Total current assets	0.3	0.4
Investment in consolidated subsidiaries	2,790.0	2,672.3
Property, plant and equipment, gross	0.6	0.6
Less—accumulated depreciation and amortization	0.6	0.6
Property, plant and equipment, net	0.0	0.0
Advances to affiliates - noncurrent	2,042.4	2,070.1
Other noncurrent assets	0.1	0.0
Total other assets	2,042.5	2,070.1
Total Assets	4,832.8	4,742.8
Liabilities and Partners' Capital
Payables	0.2	0.5
Payable to affiliates	1.6	1.5
Advances from affiliates	0.0	0.0
Other current liabilities	0.0	0.0
Total current liabilities	1.8	2.0
Long-term debt and capital lease obligation	0.0	0.0
Payable to affiliate - noncurrent		16.0
Advances from affiliates - noncurrent	0.0	0.0
Other noncurrent liabilities	0.0	0.0
Total other liabilities and deferred credits	0.0	16.0
Total partners' capital	4,831.0	4,724.8
Total Liabilities and Partners' Capital	4,832.8	4,742.8
Reportable Legal Entities | Subsidiary Issuer
Assets
Cash and cash equivalents	15.6	4.6	15.1	1.8
Receivables	0.0	0.0
Receivables - affiliate	0.0	0.0
Costs recoverable from customers	0.0
Prepayments	0.0	0.0
Advances to affiliates	15.3	0.0
Other current assets	0.0	0.0
Total current assets	30.9	4.6
Investment in consolidated subsidiaries	6,653.9	6,676.7
Property, plant and equipment, gross	0.0	0.0
Less—accumulated depreciation and amortization	0.0	0.0
Property, plant and equipment, net	0.0	0.0
Advances to affiliates - noncurrent	864.1	923.7
Other noncurrent assets	2.6	3.3
Total other assets	866.7	927.0
Total Assets	7,551.5	7,608.3
Liabilities and Partners' Capital
Payables	0.1	0.1
Payable to affiliates	0.0	0.0
Advances from affiliates	2.1	2.3
Other current liabilities	26.7	25.2
Total current liabilities	28.9	27.6
Long-term debt and capital lease obligation	2,279.3	2,461.8
Payable to affiliate - noncurrent		0.0
Advances from affiliates - noncurrent	2,453.1	2,446.6
Other noncurrent liabilities	0.2	0.0
Total other liabilities and deferred credits	2,453.3	2,446.6
Total partners' capital	2,790.0	2,672.3
Total Liabilities and Partners' Capital	7,551.5	7,608.3
Reportable Legal Entities | Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	11.2	12.7	7.1	2.2
Receivables	122.3	133.4
Receivables - affiliate	6.7	7.0
Costs recoverable from customers	11.1
Prepayments	25.8	17.8
Advances to affiliates	2.1	2.3
Other current assets	12.4	13.5
Total current assets	191.6	186.7
Investment in consolidated subsidiaries	0.0	0.0
Property, plant and equipment, gross	11,210.9	10,883.0
Less—accumulated depreciation and amortization	2,862.7	2,620.5
Property, plant and equipment, net	8,348.2	8,262.5
Advances to affiliates - noncurrent	410.7	376.5
Other noncurrent assets	454.4	460.5
Total other assets	865.1	837.0
Total Assets	9,404.9	9,286.2
Liabilities and Partners' Capital
Payables	83.4	87.3
Payable to affiliates	6.7	7.0
Advances from affiliates	15.3	0.0
Other current liabilities	163.5	167.9
Total current liabilities	268.9	262.2
Long-term debt and capital lease obligation	1,395.9	1,225.0
Payable to affiliate - noncurrent		0.0
Advances from affiliates - noncurrent	864.1	923.7
Other noncurrent liabilities	222.1	198.6
Total other liabilities and deferred credits	1,086.2	1,122.3
Total partners' capital	6,653.9	6,676.7
Total Liabilities and Partners' Capital	9,404.9	9,286.2
Eliminations
Assets
Cash and cash equivalents	0.0	0.0	$ 0.0	$ 0.0
Receivables	0.0	0.0
Receivables - affiliate	(6.7)	(7.0)
Costs recoverable from customers	0.0
Prepayments	0.0	0.0
Advances to affiliates	(17.4)	(2.3)
Other current assets	(3.2)	(1.8)
Total current assets	(27.3)	(11.1)
Investment in consolidated subsidiaries	(9,443.9)	(9,349.0)
Property, plant and equipment, gross	0.0	0.0
Less—accumulated depreciation and amortization	0.0	0.0
Property, plant and equipment, net	0.0	0.0
Advances to affiliates - noncurrent	(3,317.2)	(3,370.3)
Other noncurrent assets	0.5	(0.3)
Total other assets	(3,316.7)	(3,370.6)
Total Assets	(12,787.9)	(12,730.7)
Liabilities and Partners' Capital
Payables	0.0	0.0
Payable to affiliates	(6.7)	(7.0)
Advances from affiliates	(17.4)	(2.3)
Other current liabilities	(2.7)	(2.1)
Total current liabilities	(26.8)	(11.4)
Long-term debt and capital lease obligation	0.0	0.0
Payable to affiliate - noncurrent		0.0
Advances from affiliates - noncurrent	(3,317.2)	(3,370.3)
Other noncurrent liabilities	0.0	0.0
Total other liabilities and deferred credits	(3,317.2)	(3,370.3)
Total partners' capital	(9,443.9)	(9,349.0)
Total Liabilities and Partners' Capital	$ (12,787.9)	$ (12,730.7)

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Guarantee of Securities of Subsidiaries Guarantee of Securities of Subsidiaries Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Revenues:
Transportation	$ 245.8	$ 266.4	$ 792.8	$ 852.0
Storage, parking and lending	21.1	23.2	67.8	79.8
Other	11.0	10.9	38.0	53.3
Total operating revenues	277.9	300.5	898.6	985.1
Operating Costs and Expenses:
Fuel and transportation	3.5	9.0	12.0	42.7
Operation and maintenance	46.9	49.0	144.2	141.0
Administrative and general	32.8	27.1	100.6	96.9
Other operating costs and expenses	113.9	105.4	334.6	363.5
Total operating costs and expenses	197.1	190.5	591.4	644.1
Operating (loss) income	80.8	110.0	307.2	341.0
Other Deductions (Income):
Interest expense	43.5	41.0	130.9	131.1
Interest expense - affiliates, net	0.0	0.0	0.0	0.0
Interest income	0.0	0.0	(0.1)	(0.3)
Equity in earnings of subsidiaries	0.0	0.0	0.0	0.0
Miscellaneous other income, net	(0.7)	(1.1)	(1.3)	(3.5)
Total other (income) deductions	42.8	39.9	129.5	127.3
Income (loss) before income taxes	38.0	70.1	177.7	213.7
Income taxes	0.1	0.3	0.4	0.9
Net income (loss)	37.9	69.8	177.3	212.8
Reportable Legal Entities | Parent Guarantor
Operating Revenues:
Transportation	0.0	0.0	0.0	0.0
Storage, parking and lending	0.0	0.0	0.0	0.0
Other	0.0	0.0	0.0	0.0
Total operating revenues	0.0	0.0	0.0	0.0
Operating Costs and Expenses:
Fuel and transportation	0.0	0.0	0.0	0.0
Operation and maintenance	0.0	0.0	0.0	0.0
Administrative and general	(0.1)	(0.3)	(0.2)	(0.3)
Other operating costs and expenses	0.1	0.4	0.3	0.5
Total operating costs and expenses	0.0	0.1	0.1	0.2
Operating (loss) income	0.0	(0.1)	(0.1)	(0.2)
Other Deductions (Income):
Interest expense	0.0	0.0	0.0	0.0
Interest income - affiliates, net	(17.5)	(12.4)	(49.3)	(34.6)
Interest income			0.0	0.0
Equity in earnings of subsidiaries	(20.4)	(57.5)	(128.1)	(178.4)
Miscellaneous other income, net	0.0	0.0	0.0	0.0
Total other (income) deductions	(37.9)	(69.9)	(177.4)	(213.0)
Income (loss) before income taxes	37.9	69.8	177.3	212.8
Income taxes	0.0	0.0	0.0	0.0
Net income (loss)	37.9	69.8	177.3	212.8
Reportable Legal Entities | Subsidiary Issuer
Operating Revenues:
Transportation	0.0	0.0	0.0	0.0
Storage, parking and lending	0.0	0.0	0.0	0.0
Other		0.0	0.0	0.0
Total operating revenues	0.0	0.0	0.0	0.0
Operating Costs and Expenses:
Fuel and transportation	0.0	0.0	0.0	0.0
Operation and maintenance	0.0	0.0	0.0	0.0
Administrative and general	0.0	0.0	0.0	0.0
Other operating costs and expenses	0.0	0.0	0.0	0.0
Total operating costs and expenses	0.0	0.0	0.0	0.0
Operating (loss) income	0.0	0.0	0.0	0.0
Other Deductions (Income):
Interest expense	29.2	32.2	91.8	97.6
Interest expense - affiliates, net	14.0	11.0	38.1	30.1
Interest income			0.0	(0.2)
Equity in earnings of subsidiaries	(63.6)	(100.7)	(258.0)	(305.9)
Miscellaneous other income, net	0.0	0.0	0.0	0.0
Total other (income) deductions	(20.4)	(57.5)	(128.1)	(178.4)
Income (loss) before income taxes	20.4	57.5	128.1	178.4
Income taxes	0.0	0.0	0.0	0.0
Net income (loss)	20.4	57.5	128.1	178.4
Reportable Legal Entities | Non-Guarantor Subsidiaries
Operating Revenues:
Transportation	266.5	288.9	854.7	918.3
Storage, parking and lending	21.1	23.2	68.1	80.0
Other	11.0	10.9	38.0	53.3
Total operating revenues	298.6	323.0	960.8	1,051.6
Operating Costs and Expenses:
Fuel and transportation	24.2	31.5	74.2	109.2
Operation and maintenance	46.9	49.0	144.2	141.0
Administrative and general	32.9	27.4	100.8	97.2
Other operating costs and expenses	113.8	105.0	334.3	363.0
Total operating costs and expenses	217.8	212.9	653.5	710.4
Operating (loss) income	80.8	110.1	307.3	341.2
Other Deductions (Income):
Interest expense	14.3	8.8	39.1	33.5
Interest expense - affiliates, net	3.5	1.4	11.2	4.5
Interest income			(0.1)	(0.1)
Equity in earnings of subsidiaries	0.0	0.0	0.0	0.0
Miscellaneous other income, net	(0.7)	(1.1)	(1.3)	(3.5)
Total other (income) deductions	17.1	9.1	48.9	34.4
Income (loss) before income taxes	63.7	101.0	258.4	306.8
Income taxes	0.1	0.3	0.4	0.9
Net income (loss)	63.6	100.7	258.0	305.9
Eliminations
Operating Revenues:
Transportation	(20.7)	(22.5)	(61.9)	(66.3)
Storage, parking and lending	0.0	0.0	(0.3)	(0.2)
Other	0.0	0.0	0.0	0.0
Total operating revenues	(20.7)	(22.5)	(62.2)	(66.5)
Operating Costs and Expenses:
Fuel and transportation	(20.7)	(22.5)	(62.2)	(66.5)
Operation and maintenance	0.0	0.0	0.0	0.0
Administrative and general	0.0	0.0	0.0	0.0
Other operating costs and expenses	0.0	0.0	0.0	0.0
Total operating costs and expenses	(20.7)	(22.5)	(62.2)	(66.5)
Operating (loss) income	0.0	0.0	0.0	0.0
Other Deductions (Income):
Interest expense	0.0	0.0	0.0	0.0
Interest expense - affiliates, net	0.0	0.0	0.0	0.0
Interest income			0.0	0.0
Equity in earnings of subsidiaries	84.0	158.2	386.1	484.3
Miscellaneous other income, net	0.0	0.0	0.0	0.0
Total other (income) deductions	84.0	158.2	386.1	484.3
Income (loss) before income taxes	(84.0)	(158.2)	(386.1)	(484.3)
Income taxes	0.0	0.0	0.0	0.0
Net income (loss)	$ (84.0)	$ (158.2)	$ (386.1)	$ (484.3)

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Guarantee of Securities of Subsidiaries Guarantee of Securities of Subsidiaries Statements of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 37.9	$ 69.8	$ 177.3	$ 212.8
Other comprehensive income (loss):
(Loss) gain on cash flow hedge	0.0	0.0	0.0	(1.5)
Reclassification adjustment transferred to Net income from cash flow hedges	0.2	0.6	1.0	1.9
Pension and other postretirement benefit costs	(0.1)	0.1	1.4	0.8
Total Comprehensive Income (Loss)	38.0	70.5	179.7	214.0
Reportable Legal Entities | Parent Guarantor
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	37.9	69.8	177.3	212.8
Other comprehensive income (loss):
(Loss) gain on cash flow hedge				(1.5)
Reclassification adjustment transferred to Net income from cash flow hedges	0.2	0.6	1.0	1.9
Pension and other postretirement benefit costs	(0.1)	0.1	1.4	0.8
Total Comprehensive Income (Loss)	38.0	70.5	179.7	214.0
Reportable Legal Entities | Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	20.4	57.5	128.1	178.4
Other comprehensive income (loss):
(Loss) gain on cash flow hedge				(1.5)
Reclassification adjustment transferred to Net income from cash flow hedges	0.2	0.6	1.0	1.9
Pension and other postretirement benefit costs	(0.1)	0.1	1.4	0.8
Total Comprehensive Income (Loss)	20.5	58.2	130.5	179.6
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	63.6	100.7	258.0	305.9
Other comprehensive income (loss):
(Loss) gain on cash flow hedge				0.0
Reclassification adjustment transferred to Net income from cash flow hedges	0.1	0.2	0.5	0.5
Pension and other postretirement benefit costs	(0.1)	0.1	1.4	0.8
Total Comprehensive Income (Loss)	63.6	101.0	259.9	307.2
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(84.0)	(158.2)	(386.1)	(484.3)
Other comprehensive income (loss):
(Loss) gain on cash flow hedge				1.5
Reclassification adjustment transferred to Net income from cash flow hedges	(0.3)	(0.8)	(1.5)	(2.4)
Pension and other postretirement benefit costs	0.2	(0.2)	(2.8)	(1.6)
Total Comprehensive Income (Loss)	$ (84.1)	$ (159.2)	$ (390.4)	$ (486.8)

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Guarantee of Securities of Subsidiaries Guarantee of Securities of Subsidiaries Statements of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows
Net cash provided by (used in) operating activities	$ 455.3	$ 503.2
Investing Activities:
Capital expenditures	(354.8)	(496.0)
Proceeds from sale of operating assets	0.9	63.7
Advances to affiliates, net	0.0	0.0
Net cash provided by (used in) investing activities	(353.9)	(432.3)
Financing Activities:
Proceeds from long-term debt, net of issuance cost	0.0	494.0
Repayment of borrowings from long-term debt	(185.0)	(575.0)
Proceeds from borrowings on revolving credit agreement	525.0	505.0
Repayment of borrowings on revolving credit agreement	(355.0)	(400.0)
Principal payment of capital lease obligation	(0.4)	(0.3)
Advances from affiliates, net	0.1	0.1
Distributions paid	(76.7)	(76.7)
Net cash (used in) provided by financing activities	(92.0)	(52.9)
(Decrease) increase in cash and cash equivalents	9.4	18.0
Cash and cash equivalents at beginning of period	17.6	4.6
Cash and cash equivalents at end of period	27.0	22.6
Reportable Legal Entities | Parent Guarantor
Statement of Cash Flows
Net cash provided by (used in) operating activities	48.8	33.8
Investing Activities:
Capital expenditures	0.0	0.0
Proceeds from sale of operating assets	0.0	0.0
Advances to affiliates, net	27.7	42.6
Net cash provided by (used in) investing activities	27.7	42.6
Financing Activities:
Proceeds from long-term debt, net of issuance cost		0.0
Repayment of borrowings from long-term debt	0.0	0.0
Proceeds from borrowings on revolving credit agreement	0.0	0.0
Repayment of borrowings on revolving credit agreement	0.0	0.0
Principal payment of capital lease obligation	0.0	0.0
Advances from affiliates, net	0.1	0.1
Distributions paid	(76.7)	(76.7)
Net cash (used in) provided by financing activities	(76.6)	(76.6)
(Decrease) increase in cash and cash equivalents	(0.1)	(0.2)
Cash and cash equivalents at beginning of period	0.3	0.6
Cash and cash equivalents at end of period	0.2	0.4
Reportable Legal Entities | Subsidiary Issuer
Statement of Cash Flows
Net cash provided by (used in) operating activities	(124.6)	(117.0)
Investing Activities:
Capital expenditures	0.0	0.0
Proceeds from sale of operating assets	0.0	0.0
Advances to affiliates, net	44.3	(398.5)
Net cash provided by (used in) investing activities	44.3	(398.5)
Financing Activities:
Proceeds from long-term debt, net of issuance cost		494.0
Repayment of borrowings from long-term debt	(185.0)	(300.0)
Proceeds from borrowings on revolving credit agreement	0.0	0.0
Repayment of borrowings on revolving credit agreement	0.0	0.0
Principal payment of capital lease obligation	0.0	0.0
Advances from affiliates, net	276.3	334.8
Distributions paid	0.0	0.0
Net cash (used in) provided by financing activities	91.3	528.8
(Decrease) increase in cash and cash equivalents	11.0	13.3
Cash and cash equivalents at beginning of period	4.6	1.8
Cash and cash equivalents at end of period	15.6	15.1
Reportable Legal Entities | Non-Guarantor Subsidiaries
Statement of Cash Flows
Net cash provided by (used in) operating activities	531.1	586.4
Investing Activities:
Capital expenditures	(354.8)	(496.0)
Proceeds from sale of operating assets	0.9	63.7
Advances to affiliates, net	(303.7)	(377.4)
Net cash provided by (used in) investing activities	(657.6)	(809.7)
Financing Activities:
Proceeds from long-term debt, net of issuance cost		0.0
Repayment of borrowings from long-term debt	0.0	(275.0)
Proceeds from borrowings on revolving credit agreement	525.0	505.0
Repayment of borrowings on revolving credit agreement	(355.0)	(400.0)
Principal payment of capital lease obligation	(0.4)	(0.3)
Advances from affiliates, net	(44.6)	398.5
Distributions paid	0.0	0.0
Net cash (used in) provided by financing activities	125.0	228.2
(Decrease) increase in cash and cash equivalents	(1.5)	4.9
Cash and cash equivalents at beginning of period	12.7	2.2
Cash and cash equivalents at end of period	11.2	7.1
Eliminations
Statement of Cash Flows
Net cash provided by (used in) operating activities	0.0	0.0
Investing Activities:
Capital expenditures	0.0	0.0
Proceeds from sale of operating assets	0.0	0.0
Advances to affiliates, net	231.7	733.3
Net cash provided by (used in) investing activities	231.7	733.3
Financing Activities:
Proceeds from long-term debt, net of issuance cost		0.0
Repayment of borrowings from long-term debt	0.0	0.0
Proceeds from borrowings on revolving credit agreement	0.0	0.0
Repayment of borrowings on revolving credit agreement	0.0	0.0
Principal payment of capital lease obligation	0.0	0.0
Advances from affiliates, net	(231.7)	(733.3)
Distributions paid	0.0	0.0
Net cash (used in) provided by financing activities	(231.7)	(733.3)
(Decrease) increase in cash and cash equivalents	0.0	0.0
Cash and cash equivalents at beginning of period	0.0	0.0
Cash and cash equivalents at end of period	$ 0.0	$ 0.0