10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2021

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			20-3265614
(State or other jurisdiction of incorporation or organization)			(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:
Title of each class	Trading Symbol(s)	Name of each exchange on which registered
NONE	NONE	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.

    Large Accelerated Filer o Accelerated Filer o Non-Accelerated Filer ý Smaller Reporting Company ☐

Emerging Growth Company ☐

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. 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, 2021

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	10
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	17
Item 3. Quantitative and Qualitative Disclosures About Market Risk	20
Item 4. Controls and Procedures	20
PART II - OTHER INFORMATION
Item 1. Legal Proceedings	21
Item 1A. Risk Factors	21
Item 6. Exhibits	21
Signatures	22

2

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED BALANCE SHEETS

(Millions)

(Unaudited)

ASSETS	September 30, 2021		December 31, 2020
Current Assets:
Cash and cash equivalents	$	147.0	$	2.9
Receivables:
Trade, net	100.3		115.1
Other	26.4		23.4
Gas transportation receivables	15.0		6.6
Advances to affiliates	1.8		—
Prepayments	25.2		18.5
Other current assets	24.1		7.0
Total current assets	339.8		173.5
Property, Plant and Equipment:
Natural gas transmission and other plant	12,166.0		11,964.1
Construction work in progress	235.3		184.2
Property, plant and equipment, gross	12,401.3		12,148.3
Less—accumulated depreciation and amortization	3,862.1		3,598.5
Property, plant and equipment, net	8,539.2		8,549.8
Other Assets:
Goodwill	237.4		237.4
Gas stored underground	101.5		101.9
Other	181.8		167.3
Total other assets	520.7		506.6
Total Assets	$	9,399.7	$	9,229.9

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, 2021		December 31, 2020
Current Liabilities:
Payables:
Trade	$	49.4	$	43.6
Affiliates	2.1		9.9
Other	16.3		9.6
Gas transportation payables	16.4		10.9
Accrued taxes, other	83.7		70.3
Accrued interest	43.1		33.1
Accrued payroll and employee benefits	35.0		34.5
Regulatory liabilities	9.3		14.1
Other current liabilities	36.9		40.9
Total current liabilities	292.2		266.9
Long-term debt and finance lease obligation	3,333.6		3,460.7
Other Liabilities and Deferred Credits:
Pension liability	12.9		18.0
Asset retirement obligations	63.5		54.9
Provision for other asset retirement	86.7		81.6
Other	120.3		98.7
Total other liabilities and deferred credits	283.4		253.2
Commitments and Contingencies
Partners' Capital:
Partners' capital	5,568.7		5,328.9
Accumulated other comprehensive loss	(78.2)		(79.8)
Total partners' capital	5,490.5		5,249.1
Total Liabilities and Partners' Capital	$	9,399.7	$	9,229.9

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,
	2021		2020		2021		2020
Operating Revenues:
Transportation	$	258.7	$	243.3	$	842.5	$	788.3
Storage, parking and lending	26.9		28.8		82.4		82.5
Other	19.7		15.9		60.3		52.0
Total operating revenues	305.3		288.0		985.2		922.8
Operating Costs and Expenses:
Fuel and transportation	1.2		3.8		14.5		14.5
Operation and maintenance	55.3		55.7		153.0		148.3
Administrative and general	35.4		34.6		105.1		104.9
Depreciation and amortization	91.1		91.5		274.1		268.4
(Gain) loss on sale of assets	—		(0.2)		(0.2)		0.9
Taxes other than income taxes	28.9		27.7		85.0		86.2
Total operating costs and expenses	211.9		213.1		631.5		623.2
Operating income	93.4		74.9		353.7		299.6
Other Deductions (Income):
Interest expense	39.7		43.8		120.7		127.2
Miscellaneous other income, net	(1.9)		(1.0)		(7.2)		(3.5)
Total other deductions	37.8		42.8		113.5		123.7
Income before income taxes	55.6		32.1		240.2		175.9
Income taxes	0.1		0.1		0.4		0.3
Net income	$	55.5	$	32.0	$	239.8	$	175.6

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,
	2021		2020		2021		2020
Net income	$	55.5	$	32.0	$	239.8	$	175.6
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.1		0.2		0.6		0.6
Pension and other postretirement benefit costs, net of tax	0.4		0.9		1.0		2.3
Total Comprehensive Income	$	56.0	$	33.1	$	241.4	$	178.5

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,
	2021		2020
OPERATING ACTIVITIES:
Net income	$	239.8	$	175.6
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	274.1		268.4
Amortization of deferred costs and other	6.0		10.5
(Gain) loss on sale of assets	(0.2)		0.9
Changes in operating assets and liabilities:
Trade and other receivables	11.8		25.7
Gas transportation receivables and storage assets	(23.1)		(18.6)
Other assets	(6.1)		(8.7)
Trade and other payables	2.8		(7.7)
Gas transportation payables	6.5		10.9
Accrued liabilities	24.9		33.6
Regulatory assets and liabilities	(8.0)		6.8
Other liabilities	(1.6)		3.8
Net cash provided by operating activities	526.9		501.2
INVESTING ACTIVITIES:
Capital expenditures	(238.7)		(350.5)
Proceeds from sale of operating assets	0.5		3.7
Advances to affiliates	(1.8)		(4.3)
Net cash used in investing activities	(240.0)		(351.1)
FINANCING ACTIVITIES:
Proceeds from long-term debt, net of issuance cost	—		495.0
Proceeds from borrowings on revolving credit agreement	150.0		432.9
Repayment of borrowings on revolving credit agreement, including        financing fees	(284.4)		(727.9)
Principal payment of finance lease obligation	(0.6)		(0.5)
Advances from affiliates	(7.8)		(4.1)
Net cash (used in) provided by financing activities	(142.8)		195.4
Increase in cash and cash equivalents	144.1		345.5
Cash and cash equivalents at beginning of period	2.9		3.7
Cash and cash equivalents at end of period	$	147.0	$	349.2

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)

	Three Months Ended September 30, 2020
		Partners' Capital		Accumulated Other Comprehensive (Loss) Income		Total  Partners' Capital
Balance June 30, 2020		$	5,284.2	$	(79.3)	$	5,204.9
Add:
Net income		32.0		—		32.0
Other comprehensive income, net of tax		—		1.1		1.1
Balance September 30, 2020		$	5,316.2	$	(78.2)	$	5,238.0
	Three Months Ended September 30, 2021
		Partners' Capital		Accumulated Other Comprehensive (Loss) Income		Total  Partners' Capital
Balance June 30, 2021		$	5,513.2	$	(78.7)	$	5,434.5
Add:
Net income		55.5		—		55.5
Other comprehensive income, net of tax		—		0.5		0.5
Balance September 30, 2021		$	5,568.7	$	(78.2)	$	5,490.5

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

8

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL

(Millions)

(Unaudited)

	Nine Months Ended September 30, 2020
		Partners' Capital		Accumulated Other Comprehensive (Loss) Income		Total  Partners' Capital
Balance December 31, 2019		$	5,140.6	$	(81.1)	$	5,059.5
Add:
Net income		175.6		—		175.6
Other comprehensive income, net of tax		—		2.9		2.9
Balance September 30, 2020		$	5,316.2	$	(78.2)	$	5,238.0
	Nine Months Ended September 30, 2021
		Partners' Capital		Accumulated Other Comprehensive (Loss) Income		Total  Partners' Capital
Balance December 31, 2020		$	5,328.9	$	(79.8)	$	5,249.1
Add:
Net income		239.8		—		239.8
Other comprehensive income, net of tax		—		1.6		1.6
Balance September 30, 2021		$	5,568.7	$	(78.2)	$	5,490.5

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

9

BOARDWALK PIPELINE PARTNERS, LP

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1:  Basis of Presentation

Boardwalk Pipeline Partners, LP (the Company) 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 pipeline and storage systems for natural gas and natural gas liquids and other hydrocarbons (herein referred to together as NGLs). As of September 30, 2021, Boardwalk Pipelines Holding Corp. (BPHC), a wholly owned subsidiary of Loews Corporation (Loews), owned directly or indirectly, 100% of the Company's capital.

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America 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 Company's financial position as of September 30, 2021, and December 31, 2020, its results of operations, comprehensive income and changes in partners' capital for the three and nine months ended September 30, 2021 and 2020, and its changes in cash flows for the nine months ended September 30, 2021 and 2020. Reference is made to the Notes to the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2020 (2020 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 Company's 2020 Annual Report on Form 10-K are the same policies that were used in preparing the accompanying unaudited condensed consolidated financial statements. Net income for interim periods may not necessarily be indicative of results for the full year.

Note 2: Revenues

The Company operates in one reportable segment and contracts directly with end-use customers, including local distribution companies, electric power generators, exporters of liquefied natural gas and industrial users, with producers and marketers of natural gas, and with interstate and intrastate pipelines, who, in turn, provide transportation and storage services for end-users. The following table presents the Company's revenues disaggregated by type of service for the three and nine months ended September 30, 2021 and 2020 (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
Revenues from Contracts with Customers
Firm Service (1)	$	283.2	$	265.8	$	913.1	$	858.1
Interruptible Service	6.5		8.9		25.2		24.6
Other revenues	6.7		4.9		20.9		15.3
Total Revenues from Contracts with Customers	296.4		279.6		959.2		898.0
Other operating revenues (2)	8.9		8.4		26.0		24.8
Total Operating Revenues	$	305.3	$	288.0	$	985.2	$	922.8

(1)Revenues earned from contracts with minimum volume commitments (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 Company and do not represent revenues earned from contracts with customers.

10

Contract Balances

As of September 30, 2021, and December 31, 2020, the Company had receivables recorded in Trade Receivables, net from contracts with customers of $100.3 million and $115.1 million, contract assets recorded in Other Assets from contracts with a customer of $2.2 million and $2.9 million, and contract liabilities recorded in Other Current Liabilities (current portion) and Other Liabilities (noncurrent portion) from contracts with customers of $18.8 million and $17.2 million.

As of September 30, 2021, contract liabilities are expected to be recognized through 2040. Significant changes in the contract liability balances during the nine months ended September 30, 2021, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2020(1)	$	17.2
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(4.2)
Increases due to cash received, excluding amounts recognized as     revenues during the period	5.8
Balance as of September 30, 2021(1)	$	18.8

(1)As of September 30, 2021, and December 31, 2020, $4.0 million and $4.9 million were recorded in Other Current Liabilities (current portion), and $14.8 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Significant changes in the contract liability balances during the nine months ended September 30, 2020, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2019(1)	$	11.8
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(3.3)
Increases due to cash received, excluding amounts recognized as     revenues during the period	9.0
Balance as of September 30, 2020(1)	$	17.5

(1)As of September 30, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Other Current Liabilities (current portion) and $11.5 million and $9.6 million were recorded in Other Liabilities (noncurrent portion).

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, 2021. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, in accordance with firm service contracts. Additionally, for the Company's customers that are charged maximum tariff rates related to its Federal Energy Regulatory Commission 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 Company 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) considerations in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) considerations that were received prior to September 30, 2021, that will be recognized in revenue in future periods, such as recorded in contract liabilities. The estimated revenues reflected in the table may include estimated revenues that are anticipated under executed precedent transportation agreements for projects that are subject to regulatory approvals.

11

	In millions
	2021 (1)		2022		Thereafter		Total
Estimated revenues from contracts with customers     from unsatisfied performance obligations as of     September 30, 2021	$	302.0	$	1,091.5	$	7,477.5	$	8,871.0
Operating revenues which are fixed and     determinable (operating leases)	6.0		24.0		201.5		231.5
Total projected operating revenues under committed     firm agreements as of September 30, 2021	$	308.0	$	1,115.5	$	7,679.0	$	9,102.5

(1)The 2021 period is for the three months ending December 31, 2021. For the nine months ended September 30, 2021, the Company recognized $862.0 million of fixed fee revenues for the fulfillment of performance obligations.

Note 3:  Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables

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

The operating subsidiaries of the Company 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, 2021, the amount of gas owed to the Company's operating subsidiaries due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 8.4 trillion British thermal units (TBtu). Assuming an average market price during September 2021 of $4.91 per million British thermal unit (MMBtu), the market value of that gas was approximately $41.2 million. As of December 31, 2020, the amount of gas owed to the Company's operating subsidiaries due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 11.2 TBtu. Assuming an average market price during December 2020 of $2.45 per MMBtu, the market value of that gas was approximately $27.4 million. As of September 30, 2021, and December 31, 2020, there were no outstanding NGL imbalances owed to the Company's 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 Company's financial condition, results of operations or cash flows.

Note 4: Fair Value Measurements

Financial Assets and Liabilities

The methods and assumptions used in estimating the fair value amounts included in the disclosures for financial assets and liabilities are consistent with those disclosed in the 2020 Annual Report on Form 10-K.

The carrying amounts and estimated fair values of the Company's financial assets and liabilities which were not recorded at fair value on the Condensed Consolidated Balance Sheets as of September 30, 2021, and December 31, 2020, were as follows (in millions):

As of September 30, 2021				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	147.0		$	147.0	$	—	$	—	$	147.0
Financial Liabilities
Long-term debt	$	3,333.1	(1)	$	—	$	3,699.6	$	—	$	3,699.6

(1)The carrying amount of long-term debt excludes a $5.5 million long-term finance lease obligation and $5.0 million of unamortized debt issuance costs.

12

As of December 31, 2020				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	2.9		$	2.9	$	—	$	—	$	2.9
Financial Liabilities
Long-term debt	$	3,460.4	(1)	$	—	$	3,847.6	$	—	$	3,847.6

(1)The carrying amount of long-term debt excludes a $6.1 million long-term finance lease obligation and $5.8 million of unamortized debt issuance costs.

Note 5:  Commitments and Contingencies

Legal Proceedings and Settlements

The Company and its subsidiaries are parties to various legal actions arising in the normal course of business. Management believes the disposition of these outstanding legal actions, including the legal actions identified below, will not have a material impact on the Company'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 Company, Boardwalk GP, LP (Boardwalk GP), Boardwalk GP, LLC and BPHC (together, Defendants), regarding the potential exercise by Boardwalk GP of its right to purchase the issued and outstanding common units of the Company not already owned by Boardwalk GP or its affiliates (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 its Purchase Right for a cash purchase price, as determined by the Company's Third Amended and Restated Agreement of Limited Partnership, as amended (the Limited Partnership Agreement), 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 Company's common units pursuant to the Purchase Right.

On September 28, 2018, the Court denied approval of the Proposed Settlement. On February 11, 2019, a substitute verified class action complaint was filed in this proceeding. The Defendants filed a motion to dismiss, which was heard by the Court in July 2019. In October 2019, the Court ruled on the motion and granted a partial dismissal, with certain aspects of the case proceeding to trial. A trial was held the week of February 22, 2021, and post-trial oral arguments were held on July 14, 2021.

City of New Orleans Litigation

Gulf South Pipeline Company, LLC, along with several other energy companies operating in Southern Louisiana, has been named as a defendant in a petition for damages and injunctive relief in state district court for Orleans Parish, Louisiana, (Case No. 19-3466) by the City of New Orleans. The case was filed on March 29, 2019. The lawsuit claims include, among other things, negligence, strict liability, nuisance and breach of contract, alleging that the defendants' drilling, dredging, pipeline and industrial operations since the 1930s have caused increased storm surge risk, increased flood protection costs and unspecified damages to the City of New Orleans. In October 2020, this case was stayed pending the outcome of a consolidated appeal to the 5th Circuit Court of Appeals in a similar case. On August 5, 2021, the 5th Circuit Court of Appeals ruled in favor of the oil-and-gas defendants in that consolidated appeal, finding that the two cases being appealed should be re-examined in federal district court since they involve operations that were federally overseen at the time. The ruling reverses a previous decision that allowed the cases to be heard in state court, which the plaintiffs had sought. As a result of the 5th Circuit Court of Appeals' decision, it is anticipated that this case will be reviewed in federal district court to determine whether the case should be heard in that court.

13

Commitments for Construction

The Company'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. As of September 30, 2021, the commitments were approximately $142.9 million, all of which are expected to be settled within the next twelve months.

There were no substantial changes to the Company's commitments under pipeline capacity agreements disclosed in Note 5 of Part II, Item 8. of the Company's 2020 Annual Report on Form 10-K.

Asset Purchase

In September 2021, the Company acquired certain natural gas pipeline assets in the Lake Charles, Louisiana, area for approximately $20.0 million in cash. The asset acquisition was recorded in Capital expenditures on the Condensed Consolidated Statement of Cash Flows.

Note 6:  Financing

Notes and Debentures

As of September 30, 2021, and December 31, 2020, the Company had principal amounts of notes and debentures outstanding of $3.4 billion, with a weighted-average interest rate of 4.84%. The indentures governing the notes and debentures have restrictive covenants which provide that, with certain exceptions, neither the Company 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 Company's debt obligations are unsecured. As of September 30, 2021, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.

The Company has included $300.0 million of notes which mature in less than one year as long-term debt on its Condensed Consolidated Balance Sheets as of September 30, 2021. The Company has the intent and the ability to refinance the notes through the available borrowing capacity under its revolving credit facility as of September 30, 2021.

Revolving Credit Facility

As of September 30, 2021, the Company had no outstanding borrowings under its revolving credit facility and had the full borrowing capacity of $1.0 billion available. Outstanding borrowings under the Company's revolving credit facility as of December 31, 2020, were $130.0 million, with a weighted-average borrowing rate of 1.39%. The Company and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of September 30, 2021.

On May 27, 2021, the Company entered into a Master Assignment and Amendment No. 3 to Third Amended and Restated Revolving Credit Agreement (the Amendment), which amended the Third Amended and Restated Revolving Credit Agreement, dated May 26, 2015 (as amended and modified, the Credit Agreement). The Amendment, among other things, amended the Credit Agreement to (i) decrease the borrowing capacity from $1.5 billion to $1.0 billion, (ii) extend the maturity date to May 27, 2026, although the maturity date may be further extended for two one-year extensions at the Company's election, and (iii) provide for a transition from interest rates based on the Eurodollar Rate, currently considered the London Interbank Offered Rate, to interest rates based on variants of the Secured Overnight Financing Rate as needed. The remaining significant terms and conditions of the revolving credit facility agreement did not change.

14

Note 7: Employee Benefits

Defined Benefit Retirement Plans (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, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended September 30,				For the Three Months Ended September 30,
	2021		2020		2021		2020
Service cost	$	0.6	$	0.7	$	—	$	—
Interest cost	0.7		0.7		0.3		0.3
Expected return on plan assets	(1.6)		(1.4)		(0.7)		(0.8)
Amortization of unrecognized net loss	0.2		0.8		—		—
Settlement charge	0.6		0.6		—		—
Regulatory asset decrease	0.8		—		—		—
Net periodic benefit cost	$	1.3	$	1.4	$	(0.4)	$	(0.5)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Nine Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
Service cost	$	2.0	$	2.1	$	—	$	—
Interest cost	1.6		2.2		0.7		0.9
Expected return on plan assets	(4.7)		(4.7)		(2.0)		(2.4)
Amortization of unrecognized net loss	0.8		1.6		—		—
Settlement charge	1.5		2.2		—		—
Regulatory asset decrease	0.8		—		—		—
Net periodic benefit cost	$	2.0	$	3.4	$	(1.3)	$	(1.5)

During the nine months ended September 30, 2021, the Company made $4.0 million in contributions to the defined benefit pension plan and expects to fund an additional $1.2 million in the remainder of 2021.

Defined Contribution Plan

Texas Gas Transmission, LLC employees hired on or after November 1, 2006, and all other employees of the Company are provided retirement benefits under a defined contribution plan, which also provides 401(k) plan benefits to its participants. Costs related to the Company's defined contribution plan were $3.1 million and $3.0 million for the three months ended September 30, 2021 and 2020, and $9.3 million and $8.8 million for the nine months ended September 30, 2021 and 2020.

15

Note 8:  Related Party Transactions

Loews provides a variety of corporate services to the Company under service agreements, including information technology, tax, risk management, internal audit and corporate development services and charges the Company for allocated overheads. The Company incurred charges related to these services of $1.4 million and $1.5 million for the three months ended September 30, 2021 and 2020, and $4.1 million and $4.3 million for the nine months ended September 30, 2021 and 2020.

Note 9:  Supplemental Disclosure of Cash Flow Information (in millions):

	For the Nine Months Ended September 30,
	2021		2020
Cash paid during the period for:
Interest (net of amount capitalized)	$	103.8	$	108.7
Non-cash adjustments:
Accounts payable and property, plant and equipment	38.8		34.2
Right-of-use asset obtained in exchange for lease obligations(1)	12.9		0.3

(1)The 2020 amount shown in the table above has been corrected. Right-of-use asset obtained in exchange for lease obligations was previously reported as $18.3 million, which represented an inception-to-date amount and not the amount for the nine months ended September 30, 2020.

16

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, 2020 (2020 Annual Report on Form 10-K).

We operate in the midstream portion of the natural gas and natural gas liquids and other hydrocarbons industry, providing transportation and storage for those commodities.

Results of Operations

Note 2 in Part II, Item 8. of our Annual Report on Form 10-K contains a summary of our revenues and the related revenue recognition policies. A significant portion of our revenues are fee-based, being derived from capacity reservation charges under firm agreements with customers, which do not vary significantly period to period, but are impacted by longer-term trends in our business such as lower pricing on contract renewals and other factors. Our operating costs and expenses do not vary significantly based upon the amount of products transported, with the exception of costs recorded in Fuel and transportation expense, which are netted with fuel retained on our Condensed Consolidated Statements of Income.

For the Nine Months Ended September 30, 2021 and 2020

Our net income for the nine months ended September 30, 2021, increased $64.2 million, or 37%, to $239.8 million compared to $175.6 million for the nine months ended September 30, 2020, primarily due to the factors discussed below.

Operating revenues for the nine months ended September 30, 2021, increased $62.4 million, or 7%, to $985.2 million, compared to $922.8 million for the nine months ended September 30, 2020. The increase was driven primarily by our recently completed growth projects and higher system utilization from colder winter weather experienced during the first quarter of 2021.

Operating costs and expenses for the nine months ended September 30, 2021, increased $8.3 million, or 1%, to $631.5 million, compared to $623.2 million for the nine months ended September 30, 2020, primarily due to an increased asset base from recently completed growth projects.

Total other deductions for the nine months ended September 30, 2021, decreased $10.2 million, or 8%, to $113.5 million compared to $123.7 million for the nine months ended September 30, 2020, primarily due to lower average interest rates, lower average outstanding long-term debt and higher allowance for funds used during construction.

Liquidity and Capital Resources

We anticipate that our existing capital resources, including our revolving credit facility and our cash flows from operating activities, will be adequate to fund our operations and capital expenditures for 2021. We have an effective shelf registration statement on file with the Securities and Exchange Commission under which we may publicly issue debt securities, warrants or rights from time to time. In the second quarter of 2022, we expect to retire $300.0 million of notes at their maturity through available capital resources, including, but not limited to, using available cash, borrowing under our revolving credit facility or publicly issuing debt securities. Refer to Note 6 in Part I, Item 1 of this Quarterly Report on Form 10-Q for more information.

Guarantee of Securities of Subsidiaries

Our debt is primarily issued at Boardwalk Pipelines, LP (Boardwalk Pipelines), our wholly owned subsidiary, although we have historically also issued debt at our operating subsidiaries. As of September 30, 2021, all of the outstanding notes issued by Boardwalk Pipelines (Subsidiary Issuer) and the full amount of the revolving credit facility, are guaranteed by us (Parent Guarantor). The purpose of the guarantees is to help simplify our reporting and capital structure.

We guarantee the amounts borrowed under the revolving credit facility, but those amounts are not subject to the reporting requirements of Rule 13-01 of Regulation S-X. As of September 30, 2021, there were no outstanding borrowings

17

under the revolving credit facility. The below table identifies our principal amounts outstanding for the debt that is subject to the disclosure rules of Rule 13-01 of Regulation S-X (in millions):

	As of September 30, 2021
Principal amounts guaranteed by Boardwalk Pipeline Partners (1)	$	2,950.0
Principal amounts not guaranteed (2)	400.0
Other (3)	(16.4)
Long-term debt and finance lease obligation	$	3,333.6

(1)This represents principal amounts of all outstanding debt at Boardwalk Pipelines subject to the disclosure rules of Rule 13-01 of Regulation S-X (the Guaranteed Notes).

(2)This represents principal amounts of outstanding debt at Gulf South Pipeline Company, LLC and Texas Gas Transmission, LLC.

(3)As of September 30, 2021, this represents the amounts related to a finance lease and unamortized debt discount and issuance costs.

The Guaranteed Notes are fully and unconditionally guaranteed by the Parent Guarantor on a senior unsecured basis. The guarantees of the Guaranteed Notes rank equally with all of our existing and future senior debt, including our guarantee of indebtedness under our revolving credit facility. The guarantees will be effectively subordinated in right of payment to all of our future secured debt to the extent of the value of the assets securing such debt. There are no restrictions on the Subsidiary Issuer's ability to pay dividends or make loans to the Parent Guarantor. The guarantee obligations will be terminated with respect to any series of notes if that series has been discharged or defeased.

Our operating assets, operating liabilities, operating revenues, expenses and other comprehensive income either exist at or are generated by our operating subsidiaries. The Parent Guarantor and the Subsidiary Issuer have no material assets, liabilities or operations independent of their respective financing activities, including the Guaranteed Notes and advances to and from each other and the operating subsidiaries as a result of the cash management program described in Note 2 of Part II, Item 8. of our 2020 Annual Report on Form 10-K, and their investments in the operating subsidiaries. For these reasons, we meet the criteria in Rule 13-01 of Regulation S-X to omit the summarized financial information from our disclosures.

Capital Expenditures

Maintenance capital expenditures for the nine months ended September 30, 2021 and 2020, were $88.9 million and $97.8 million. Growth capital expenditures were $129.8 million and $233.9 million for the nine months ended September 30, 2021 and 2020. During the nine months ended September 30, 2021, we acquired certain natural gas pipeline assets in the Lake Charles, Louisiana, area for approximately $20.0 million in cash. During the nine months ended September 30, 2020, we purchased the remaining undivided interest in the Bistineau storage facility that we did not previously own for approximately $18.8 million in cash.

Contractual Obligations

Our principal payments associated with our outstanding debt obligations as of September 30, 2021, and December 31, 2020, were $3.4 billion and $3.5 billion. Refer to Note 6 in Part I, Item 1. of this Quarterly Report on Form 10-Q and Note 11 in Part II, Item 8. of our 2020 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 increased $25.7 million to $526.9 million for the nine months ended September 30, 2021, compared to $501.2 million for the comparable 2020 period, primarily due to the change in net income.

Changes in cash flow from investing activities

Net cash used in investing activities decreased $111.1 million to $240.0 million for the nine months ended September 30, 2021, compared to $351.1 million for the comparable 2020 period. The decrease was primarily driven by a decrease of $111.8 million in capital spending primarily related to growth projects.

18

Changes in cash flow from financing activities

Net cash used in financing activities increased $338.2 million to $142.8 million for the nine months ended September 30, 2021, compared to net cash provided by financing activities of $195.4 million for the comparable 2020 period, primarily from the proceeds received from the 2020 issuance of long-term debt, partially offset by increased repayments of borrowings in 2020.

Off-Balance Sheet Arrangements

At September 30, 2021, 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 2021, there have been no significant changes to our critical accounting policies, judgments or estimates disclosed in our 2020 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, intentions 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 us 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 the impacts of volatility in energy prices and the coronavirus disease 2019, the impacts of changes to laws and regulations or the implementation thereof, the costs of maintaining and ensuring the integrity and reliability of our pipeline systems, our ability to maintain or replace expiring gas transportation and storage contracts, our ability to complete projects that we have commenced or will commence, successful negotiation, consummation and completion of contemplated transactions, projects and agreements, and our ability to contract and sell short-term capacity on our pipelines. Developments in any of these areas could cause our results to differ materially from results that have been or may be anticipated or projected. Forward-looking statements speak only as of the date they are made and we expressly disclaim any obligation or undertaking to update these statements to reflect any change in our expectations or beliefs or any change in events, conditions or circumstances on which any forward-looking statement is based.

Refer to Part I, Item 1A. and Part II, Item 7. of our 2020 Annual Report on Form 10-K for additional risks and uncertainties regarding our forward-looking statements.

19

Item 3.  Quantitative and Qualitative Disclosures About Market Risk

Refer to Part II, Item 7A. of our 2020 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 Quarterly Report on Form 10-Q. 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 Securities and Exchange Commission. 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, 2021, 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, 2021, that have materially affected or that are reasonably likely to materially affect our internal control over financial reporting. 

20

PART II – OTHER INFORMATION

Item 1.  Legal Proceedings

For a discussion of certain of our current legal proceedings, please see Note 5 in Part I, Item 1. of this Quarterly Report on Form 10-Q.

Item 1A. Risk Factors

There have been no material changes from the risk factors previously discussed in Part I, Item 1A. of our 2020 Annual Report on Form 10-K.

Item 6.  Exhibits

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

Exhibit Number	Description
3.1	Certificate of Limited Partnership of Boardwalk Pipeline Partners, LP (Incorporated by reference to Exhibit 3.1 to the Registrant's Registration Statement on Form S-1. Registration No. 333-127578, filed on August 16, 2005).
3.2	Fourth Amended and Restated Agreement of Limited Partnership of Boardwalk Pipeline Partners, LP dated as of July 19, 2018 (Incorporated by reference to Exhibit 3.2 to the Registrant's Annual Report on Form 10-K filed on February 13, 2019).
10.1	Master Assignment and Amendment No. 3 to Third Amended and Restated Revolving Credit Agreement, dated as of May 27, 2021, among Boardwalk Pipelines, LP, Texas Gas Transmission, LLC and Gulf South Pipeline Company, LLC, as borrowers, Boardwalk Pipeline Partners, LP, as guarantor, the several lenders and issuers party thereto, and Wells Fargo Bank, N.A., as administrative agent (Incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on May 27, 2021).
*22.1	Subsidiary Issuers and Guarantors of Registered Securities.
*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	Inline XBRL Taxonomy Extension Schema Document
*101.CAL	Inline XBRL Taxonomy Calculation Linkbase Document
*101.DEF	Inline XBRL Taxonomy Extension Definitions Document
*101.LAB	Inline XBRL Taxonomy Label Linkbase Document
*101.PRE	Inline XBRL Taxonomy Presentation Linkbase Document
*104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)
* Filed herewith
** Furnished herewith

21

SIGNATURE

    Pursuant to the requirements 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 1, 2021	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)

22

EX-22.1

EXHIBIT 22.1

Subsidiary Issuers and Guarantors of Registered Securities

Subsidiary Issuer	Guarantor
Boardwalk Pipelines, LP 3.375% Notes due 2023	Boardwalk Pipeline Partners, LP
Boardwalk Pipelines, LP 4.95% Notes due 2024	Boardwalk Pipeline Partners, LP
Boardwalk Pipelines, LP 5.95% Notes due 2026	Boardwalk Pipeline Partners, LP
Boardwalk Pipelines, LP 4.45% Notes due 2027	Boardwalk Pipeline Partners, LP
Boardwalk Pipelines, LP 4.80% Notes due 2029	Boardwalk Pipeline Partners, LP
Boardwalk Pipelines, LP 3.40% Notes due 2031	Boardwalk Pipeline Partners, LP

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 1, 2021	/s/ Stanley C. Horton
		Stanley C. Horton
		President and Chief Executive Officer

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 1, 2021	/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, 2021, (the Report) of Boardwalk Pipeline Partners, LP (the Company) 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 Company.

November 1, 2021

/s/ Stanley C. Horton

Stanley C. Horton

President and Chief Executive Officer

(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, 2021, (the Report) of Boardwalk Pipeline Partners, LP (the Company) 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 Company.

November 1, 2021

/s/ Jamie L. Buskill

Jamie L. Buskill

Senior Vice President, Chief Financial and Administrative Officer and Treasurer

(principal financial officer)

XML

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	Sep. 30, 2021	Nov. 01, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	01-32665
Entity Registrant Name	BOARDWALK PIPELINE PARTNERS, LP
Entity Incorporation, State	DE
Entity Tax Identification Number	20-3265614
Entity Address, Address Line One	9 Greenway Plaza, Suite 2800
Entity Address, City	Houston,
Entity Address, State	TX
Entity Address, Postal Zip Code	77046
City Area Code	(866)
Local Phone Number	913-2122
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
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Document Fiscal Period Focus	Q3
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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 147.0	$ 2.9
Receivables:
Trade, net	100.3	115.1
Other	26.4	23.4
Gas transportation receivables	15.0	6.6
Advances to affiliates	1.8	0.0
Prepayments	25.2	18.5
Other current assets	24.1	7.0
Total current assets	339.8	173.5
Property, Plant and Equipment:
Natural gas transmission and other plant	12,166.0	11,964.1
Construction work in progress	235.3	184.2
Property, plant and equipment, gross	12,401.3	12,148.3
Less—accumulated depreciation and amortization	3,862.1	3,598.5
Property, plant and equipment, net	8,539.2	8,549.8
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	101.5	101.9
Other	181.8	167.3
Total other assets	520.7	506.6
Total Assets	9,399.7	9,229.9
Payables:
Trade	49.4	43.6
Affiliates	2.1	9.9
Other	16.3	9.6
Gas transportation payables	16.4	10.9
Accrued taxes, other	83.7	70.3
Accrued interest	43.1	33.1
Accrued payroll and employee benefits	35.0	34.5
Regulatory liabilities	9.3	14.1
Other current liabilities	36.9	40.9
Total current liabilities	292.2	266.9
Long-term debt and finance lease obligation	3,333.6	3,460.7
Other Liabilities and Deferred Credits:
Pension liability	12.9	18.0
Asset retirement obligations	63.5	54.9
Provision for other asset retirement	86.7	81.6
Other	120.3	98.7
Total other liabilities and deferred credits	283.4	253.2
Commitments and Contingencies
Partners' Capital:
Partners' capital	5,568.7	5,328.9
Accumulated other comprehensive loss	(78.2)	(79.8)
Total partners' capital	5,490.5	5,249.1
Total Liabilities and Partners' Capital	$ 9,399.7	$ 9,229.9

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Revenues:
Transportation	$ 258.7	$ 243.3	$ 842.5	$ 788.3
Storage, parking and lending	26.9	28.8	82.4	82.5
Other	19.7	15.9	60.3	52.0
Total operating revenues	305.3	288.0	985.2	922.8
Operating Costs and Expenses:
Fuel and transportation	1.2	3.8	14.5	14.5
Operation and maintenance	55.3	55.7	153.0	148.3
Administrative and general	35.4	34.6	105.1	104.9
Depreciation and amortization	91.1	91.5	274.1	268.4
(Gain) loss on sale of assets	0.0	(0.2)	(0.2)	0.9
Taxes other than income taxes	28.9	27.7	85.0	86.2
Total operating costs and expenses	211.9	213.1	631.5	623.2
Operating income	93.4	74.9	353.7	299.6
Other Deductions (Income):
Interest expense	39.7	43.8	120.7	127.2
Miscellaneous other income, net	(1.9)	(1.0)	(7.2)	(3.5)
Total other deductions	37.8	42.8	113.5	123.7
Income before income taxes	55.6	32.1	240.2	175.9
Income taxes	0.1	0.1	0.4	0.3
Net income	$ 55.5	$ 32.0	$ 239.8	$ 175.6

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 55.5	$ 32.0	$ 239.8	$ 175.6
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.1	0.2	0.6	0.6
Pension and other postretirement benefit costs, net of tax	0.4	0.9	1.0	2.3
Total Comprehensive Income	$ 56.0	$ 33.1	$ 241.4	$ 178.5

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities:
Net income	$ 239.8	$ 175.6
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	274.1	268.4
Amortization of deferred costs and other	6.0	10.5
(Gain) loss on sale of assets	(0.2)	0.9
Changes in operating assets and liabilities:
Trade and other receivables	11.8	25.7
Gas transportation receivables and storage assets	(23.1)	(18.6)
Other assets	(6.1)	(8.7)
Trade and other payables	2.8	(7.7)
Gas transportation payables	6.5	10.9
Accrued liabilities	24.9	33.6
Regulatory assets and liabilities	(8.0)	6.8
Other liabilities	(1.6)	3.8
Net cash provided by operating activities	526.9	501.2
Investing Activities:
Capital expenditures	(238.7)	(350.5)
Proceeds from sale of operating assets	0.5	3.7
Advances to affiliates	(1.8)	(4.3)
Net cash used in investing activities	(240.0)	(351.1)
Financing Activities:
Proceeds from long-term debt, net of issuance cost	0.0	495.0
Proceeds from borrowings on revolving credit agreement	150.0	432.9
Repayment of borrowings on revolving credit agreement, including financing fees	(284.4)	(727.9)
Principal payment of finance lease obligation	(0.6)	(0.5)
Advances from affiliates	(7.8)	(4.1)
Net cash (used in) provided by financing activities	(142.8)	195.4
Increase in cash and cash equivalents	144.1	345.5
Cash and cash equivalents at beginning of period	2.9	3.7
Cash and cash equivalents at end of period	$ 147.0	$ 349.2

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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (Unaudited) - USD ($) $ in Millions	Total	Accumulated Other Comprehensive (Loss) Income	Partners' Capital
Beginning balance at Dec. 31, 2019	$ 5,059.5	$ (81.1)	$ 5,140.6
Add (deduct):
Net income	175.6		175.6
Other comprehensive income, net of tax	2.9	2.9
Ending balance at Sep. 30, 2020	5,238.0	(78.2)	5,316.2
Beginning balance at Jun. 30, 2020	5,204.9	(79.3)	5,284.2
Add (deduct):
Net income	32.0		32.0
Other comprehensive income, net of tax	1.1	1.1
Ending balance at Sep. 30, 2020	5,238.0	(78.2)	5,316.2
Beginning balance at Dec. 31, 2020	5,249.1	(79.8)	5,328.9
Add (deduct):
Net income	239.8		239.8
Other comprehensive income, net of tax	1.6	1.6
Ending balance at Sep. 30, 2021	5,490.5	(78.2)	5,568.7
Beginning balance at Jun. 30, 2021	5,434.5	(78.7)	5,513.2
Add (deduct):
Net income	55.5		55.5
Other comprehensive income, net of tax	0.5	0.5
Ending balance at Sep. 30, 2021	$ 5,490.5	$ (78.2)	$ 5,568.7

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Supplemental Disclosure of Cash Flow Information

9 Months Ended

Sep. 30, 2021

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,
	2021		2020
Cash paid during the period for:
Interest (net of amount capitalized)	$	103.8	$	108.7
Non-cash adjustments:
Accounts payable and property, plant and equipment	38.8		34.2
Right-of-use asset obtained in exchange for lease obligations(1)	12.9		0.3

(1)The 2020 amount shown in the table above has been corrected. Right-of-use asset obtained in exchange for lease obligations was previously reported as $18.3 million, which represented an inception-to-date amount and not the amount for the nine months ended September 30, 2020.

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Supplemental Disclosure of Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2021

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,
	2021		2020
Cash paid during the period for:
Interest (net of amount capitalized)	$	103.8	$	108.7
Non-cash adjustments:
Accounts payable and property, plant and equipment	38.8		34.2
Right-of-use asset obtained in exchange for lease obligations(1)	12.9		0.3

(1)The 2020 amount shown in the table above has been corrected. Right-of-use asset obtained in exchange for lease obligations was previously reported as $18.3 million, which represented an inception-to-date amount and not the amount for the nine months ended September 30, 2020.

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Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash paid during the period for:
Interest (net of amount capitalized)		$ 103.8	$ 108.7
Non-cash adjustments:
Accounts payable and property, plant and equipment		38.8	34.2
Right-of-use asset obtained in exchange for lease obligations	[1]	$ 12.9	$ 0.3

[1] The 2020 amount shown in the table above has been corrected. Right-of-use asset obtained in exchange for lease obligations was previously reported as $18.3 million, which represented an inception-to-date amount and not the amount for the nine months ended September 30, 2020.

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Supplemental Disclosure of Cash Flow Information Prior Period Adjustment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Right-of-use asset obtained in exchange for lease obligations	$ 0.3	[1]
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Right-of-use asset obtained in exchange for lease obligations	$ 18.3

[1] The 2020 amount shown in the table above has been corrected. Right-of-use asset obtained in exchange for lease obligations was previously reported as $18.3 million, which represented an inception-to-date amount and not the amount for the nine months ended September 30, 2020.

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Basis of Presentation

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

Boardwalk Pipeline Partners, LP (the Company) 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 pipeline and storage systems for natural gas and natural gas liquids and other hydrocarbons (herein referred to together as NGLs). As of September 30, 2021, Boardwalk Pipelines Holding Corp. (BPHC), a wholly owned subsidiary of Loews Corporation (Loews), owned directly or indirectly, 100% of the Company's capital.

The accompanying unaudited condensed consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America 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 Company's financial position as of September 30, 2021, and December 31, 2020, its results of operations, comprehensive income and changes in partners' capital for the three and nine months ended September 30, 2021 and 2020, and its changes in cash flows for the nine months ended September 30, 2021 and 2020. Reference is made to the Notes to the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2020 (2020 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 Company's 2020 Annual Report on Form 10-K are the same policies that were used in preparing the accompanying unaudited condensed consolidated financial statements. Net income for interim periods may not necessarily be indicative of results for the full year.

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Revenues

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenues from Contracts with Customers

Revenues

The Company operates in one reportable segment and contracts directly with end-use customers, including local distribution companies, electric power generators, exporters of liquefied natural gas and industrial users, with producers and marketers of natural gas, and with interstate and intrastate pipelines, who, in turn, provide transportation and storage services for end-users. The following table presents the Company's revenues disaggregated by type of service for the three and nine months ended September 30, 2021 and 2020 (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
Revenues from Contracts with Customers
Firm Service (1)	$	283.2	$	265.8	$	913.1	$	858.1
Interruptible Service	6.5		8.9		25.2		24.6
Other revenues	6.7		4.9		20.9		15.3
Total Revenues from Contracts with Customers	296.4		279.6		959.2		898.0
Other operating revenues (2)	8.9		8.4		26.0		24.8
Total Operating Revenues	$	305.3	$	288.0	$	985.2	$	922.8

(1)Revenues earned from contracts with minimum volume commitments (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 Company and do not represent revenues earned from contracts with customers.

Contract Balances

As of September 30, 2021, and December 31, 2020, the Company had receivables recorded in Trade Receivables, net from contracts with customers of $100.3 million and $115.1 million, contract assets recorded in Other Assets from contracts with a customer of $2.2 million and $2.9 million, and contract liabilities recorded in Other Current Liabilities (current portion) and Other Liabilities (noncurrent portion) from contracts with customers of $18.8 million and $17.2 million.

As of September 30, 2021, contract liabilities are expected to be recognized through 2040. Significant changes in the contract liability balances during the nine months ended September 30, 2021, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2020(1)	$	17.2
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(4.2)
Increases due to cash received, excluding amounts recognized as     revenues during the period	5.8
Balance as of September 30, 2021(1)	$	18.8

(1)As of September 30, 2021, and December 31, 2020, $4.0 million and $4.9 million were recorded in Other Current Liabilities (current portion), and $14.8 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Significant changes in the contract liability balances during the nine months ended September 30, 2020, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2019(1)	$	11.8
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(3.3)
Increases due to cash received, excluding amounts recognized as     revenues during the period	9.0
Balance as of September 30, 2020(1)	$	17.5

(1)As of September 30, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Other Current Liabilities (current portion) and $11.5 million and $9.6 million were recorded in Other Liabilities (noncurrent portion).

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, 2021. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, in accordance with firm service contracts. Additionally, for the Company's customers that are charged maximum tariff rates related to its Federal Energy Regulatory Commission 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 Company 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) considerations in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) considerations that were received prior to September 30, 2021, that will be recognized in revenue in future periods, such as recorded in contract liabilities. The estimated revenues reflected in the table may include estimated revenues that are anticipated under executed precedent transportation agreements for projects that are subject to regulatory approvals.

	In millions
	2021 (1)		2022		Thereafter		Total
Estimated revenues from contracts with customers     from unsatisfied performance obligations as of     September 30, 2021	$	302.0	$	1,091.5	$	7,477.5	$	8,871.0
Operating revenues which are fixed and     determinable (operating leases)	6.0		24.0		201.5		231.5
Total projected operating revenues under committed     firm agreements as of September 30, 2021	$	308.0	$	1,115.5	$	7,679.0	$	9,102.5

(1)The 2021 period is for the three months ending December 31, 2021. For the nine months ended September 30, 2021, the Company recognized $862.0 million of fixed fee revenues for the fulfillment of performance obligations.

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

9 Months Ended

Sep. 30, 2021

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

The operating subsidiaries of the Company 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, 2021, the amount of gas owed to the Company's operating subsidiaries due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 8.4 trillion British thermal units (TBtu). Assuming an average market price during September 2021 of $4.91 per million British thermal unit (MMBtu), the market value of that gas was approximately $41.2 million. As of December 31, 2020, the amount of gas owed to the Company's operating subsidiaries due to gas imbalances and gas loaned under PAL and certain firm service agreements was approximately 11.2 TBtu. Assuming an average market price during December 2020 of $2.45 per MMBtu, the market value of that gas was approximately $27.4 million. As of September 30, 2021, and December 31, 2020, there were no outstanding NGL imbalances owed to the Company's 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 Company's financial condition, results of operations or cash flows.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Financial Assets and Liabilities

The methods and assumptions used in estimating the fair value amounts included in the disclosures for financial assets and liabilities are consistent with those disclosed in the 2020 Annual Report on Form 10-K.

The carrying amounts and estimated fair values of the Company's financial assets and liabilities which were not recorded at fair value on the Condensed Consolidated Balance Sheets as of September 30, 2021, and December 31, 2020, were as follows (in millions):

As of September 30, 2021				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	147.0		$	147.0	$	—	$	—	$	147.0
Financial Liabilities
Long-term debt	$	3,333.1	(1)	$	—	$	3,699.6	$	—	$	3,699.6

(1)The carrying amount of long-term debt excludes a $5.5 million long-term finance lease obligation and $5.0 million of unamortized debt issuance costs.

As of December 31, 2020				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	2.9		$	2.9	$	—	$	—	$	2.9
Financial Liabilities
Long-term debt	$	3,460.4	(1)	$	—	$	3,847.6	$	—	$	3,847.6

(1)The carrying amount of long-term debt excludes a $6.1 million long-term finance lease obligation and $5.8 million of unamortized debt issuance costs.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Legal Proceedings and Settlements

The Company and its subsidiaries are parties to various legal actions arising in the normal course of business. Management believes the disposition of these outstanding legal actions, including the legal actions identified below, will not have a material impact on the Company'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 Company, Boardwalk GP, LP (Boardwalk GP), Boardwalk GP, LLC and BPHC (together, Defendants), regarding the potential exercise by Boardwalk GP of its right to purchase the issued and outstanding common units of the Company not already owned by Boardwalk GP or its affiliates (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 its Purchase Right for a cash purchase price, as determined by the Company's Third Amended and Restated Agreement of Limited Partnership, as amended (the Limited Partnership Agreement), 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 Company's common units pursuant to the Purchase Right.

On September 28, 2018, the Court denied approval of the Proposed Settlement. On February 11, 2019, a substitute verified class action complaint was filed in this proceeding. The Defendants filed a motion to dismiss, which was heard by the Court in July 2019. In October 2019, the Court ruled on the motion and granted a partial dismissal, with certain aspects of the case proceeding to trial. A trial was held the week of February 22, 2021, and post-trial oral arguments were held on July 14, 2021.

City of New Orleans Litigation

Gulf South Pipeline Company, LLC, along with several other energy companies operating in Southern Louisiana, has been named as a defendant in a petition for damages and injunctive relief in state district court for Orleans Parish, Louisiana, (Case No. 19-3466) by the City of New Orleans. The case was filed on March 29, 2019. The lawsuit claims include, among other things, negligence, strict liability, nuisance and breach of contract, alleging that the defendants' drilling, dredging, pipeline and industrial operations since the 1930s have caused increased storm surge risk, increased flood protection costs and unspecified damages to the City of New Orleans. In October 2020, this case was stayed pending the outcome of a consolidated appeal to the 5th Circuit Court of Appeals in a similar case. On August 5, 2021, the 5th Circuit Court of Appeals ruled in favor of the oil-and-gas defendants in that consolidated appeal, finding that the two cases being appealed should be re-examined in federal district court since they involve operations that were federally overseen at the time. The ruling reverses a previous decision that allowed the cases to be heard in state court, which the plaintiffs had sought. As a result of the 5th Circuit Court of Appeals' decision, it is anticipated that this case will be reviewed in federal district court to determine whether the case should be heard in that court.

Commitments for Construction

The Company'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. As of September 30, 2021, the commitments were approximately $142.9 million, all of which are expected to be settled within the next twelve months.

There were no substantial changes to the Company's commitments under pipeline capacity agreements disclosed in Note 5 of Part II, Item 8. of the Company's 2020 Annual Report on Form 10-K.

Asset Purchase

In September 2021, the Company acquired certain natural gas pipeline assets in the Lake Charles, Louisiana, area for approximately $20.0 million in cash. The asset acquisition was recorded in Capital expenditures on the Condensed Consolidated Statement of Cash Flows.

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Financing

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Financing

Financing

Notes and Debentures

As of September 30, 2021, and December 31, 2020, the Company had principal amounts of notes and debentures outstanding of $3.4 billion, with a weighted-average interest rate of 4.84%. The indentures governing the notes and debentures have restrictive covenants which provide that, with certain exceptions, neither the Company 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 Company's debt obligations are unsecured. As of September 30, 2021, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.

The Company has included $300.0 million of notes which mature in less than one year as long-term debt on its Condensed Consolidated Balance Sheets as of September 30, 2021. The Company has the intent and the ability to refinance the notes through the available borrowing capacity under its revolving credit facility as of September 30, 2021.

Revolving Credit Facility

As of September 30, 2021, the Company had no outstanding borrowings under its revolving credit facility and had the full borrowing capacity of $1.0 billion available. Outstanding borrowings under the Company's revolving credit facility as of December 31, 2020, were $130.0 million, with a weighted-average borrowing rate of 1.39%. The Company and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of September 30, 2021.

On May 27, 2021, the Company entered into a Master Assignment and Amendment No. 3 to Third Amended and Restated Revolving Credit Agreement (the Amendment), which amended the Third Amended and Restated Revolving Credit Agreement, dated May 26, 2015 (as amended and modified, the Credit Agreement). The Amendment, among other things, amended the Credit Agreement to (i) decrease the borrowing capacity from $1.5 billion to $1.0 billion, (ii) extend the maturity date to May 27, 2026, although the maturity date may be further extended for two one-year extensions at the Company's election, and (iii) provide for a transition from interest rates based on the Eurodollar Rate, currently considered the London Interbank Offered Rate, to interest rates based on variants of the Secured Overnight Financing Rate as needed. The remaining significant terms and conditions of the revolving credit facility agreement did not change.

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Employee Benefits

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Employee Benefits

Employee Benefits

Defined Benefit Retirement Plans (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, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended September 30,				For the Three Months Ended September 30,
	2021		2020		2021		2020
Service cost	$	0.6	$	0.7	$	—	$	—
Interest cost	0.7		0.7		0.3		0.3
Expected return on plan assets	(1.6)		(1.4)		(0.7)		(0.8)
Amortization of unrecognized net loss	0.2		0.8		—		—
Settlement charge	0.6		0.6		—		—
Regulatory asset decrease	0.8		—		—		—
Net periodic benefit cost	$	1.3	$	1.4	$	(0.4)	$	(0.5)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Nine Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
Service cost	$	2.0	$	2.1	$	—	$	—
Interest cost	1.6		2.2		0.7		0.9
Expected return on plan assets	(4.7)		(4.7)		(2.0)		(2.4)
Amortization of unrecognized net loss	0.8		1.6		—		—
Settlement charge	1.5		2.2		—		—
Regulatory asset decrease	0.8		—		—		—
Net periodic benefit cost	$	2.0	$	3.4	$	(1.3)	$	(1.5)

During the nine months ended September 30, 2021, the Company made $4.0 million in contributions to the defined benefit pension plan and expects to fund an additional $1.2 million in the remainder of 2021.

Defined Contribution Plan

Texas Gas Transmission, LLC employees hired on or after November 1, 2006, and all other employees of the Company are provided retirement benefits under a defined contribution plan, which also provides 401(k) plan benefits to its participants. Costs related to the Company's defined contribution plan were $3.1 million and $3.0 million for the three months ended September 30, 2021 and 2020, and $9.3 million and $8.8 million for the nine months ended September 30, 2021 and 2020.

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Related Party Transactions	9 Months Ended
	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Loews provides a variety of corporate services to the Company under service agreements, including information technology, tax, risk management, internal audit and corporate development services and charges the Company for allocated overheads. The Company incurred charges related to these services of $1.4 million and $1.5 million for the three months ended September 30, 2021 and 2020, and $4.1 million and $4.3 million for the nine months ended September 30, 2021 and 2020.

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Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting, Policy	The accompanying unaudited condensed consolidated financial statements of the Company have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America 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 Company's financial position as of September 30, 2021, and December 31, 2020, its results of operations, comprehensive income and changes in partners' capital for the three and nine months ended September 30, 2021 and 2020, and its changes in cash flows for the nine months ended September 30, 2021 and 2020. Reference is made to the Notes to the Consolidated Financial Statements in the Company's Annual Report on Form 10-K for the year ended December 31, 2020 (2020 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 Company's 2020 Annual Report on Form 10-K are the same policies that were used in preparing the accompanying unaudited condensed consolidated financial statements. Net income for interim periods may not necessarily be indicative of results for the full year.

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Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables (Policies)	9 Months Ended
	Sep. 30, 2021
Gas Balancing Arrangements [Abstract]
Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables, Policy	The operating subsidiaries of the Company provide storage services whereby they store natural gas or NGLs on behalf of customers and also periodically hold customer gas under parking and lending (PAL) services. Since the customers retain title to the gas held by the Company in providing these services, the Company does not record the related gas on its balance sheet.

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Revenues (Tables)

9 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents the Company's revenues disaggregated by type of service for the three and nine months ended September 30, 2021 and 2020 (in millions):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
Revenues from Contracts with Customers
Firm Service (1)	$	283.2	$	265.8	$	913.1	$	858.1
Interruptible Service	6.5		8.9		25.2		24.6
Other revenues	6.7		4.9		20.9		15.3
Total Revenues from Contracts with Customers	296.4		279.6		959.2		898.0
Other operating revenues (2)	8.9		8.4		26.0		24.8
Total Operating Revenues	$	305.3	$	288.0	$	985.2	$	922.8

(1)Revenues earned from contracts with minimum volume commitments (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 Company and do not represent revenues earned from contracts with customers.

Contract Liabilities

Significant changes in the contract liability balances during the nine months ended September 30, 2021, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2020(1)	$	17.2
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(4.2)
Increases due to cash received, excluding amounts recognized as     revenues during the period	5.8
Balance as of September 30, 2021(1)	$	18.8

(1)As of September 30, 2021, and December 31, 2020, $4.0 million and $4.9 million were recorded in Other Current Liabilities (current portion), and $14.8 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Significant changes in the contract liability balances during the nine months ended September 30, 2020, are as follows (in millions):

	Contract Liabilities
Balance as of December 31, 2019(1)	$	11.8
Revenues recognized that were included in the contract liability     balances at the beginning of the period	(3.3)
Increases due to cash received, excluding amounts recognized as     revenues during the period	9.0
Balance as of September 30, 2020(1)	$	17.5

(1)As of September 30, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Other Current Liabilities (current portion) and $11.5 million and $9.6 million were recorded in Other Liabilities (noncurrent portion).

Remaining Performance Obligation

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, 2021. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, in accordance with firm service contracts. Additionally, for the Company's customers that are charged maximum tariff rates related to its Federal Energy Regulatory Commission 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 Company 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) considerations in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) considerations that were received prior to September 30, 2021, that will be recognized in revenue in future periods, such as recorded in contract liabilities. The estimated revenues reflected in the table may include estimated revenues that are anticipated under executed precedent transportation agreements for projects that are subject to regulatory approvals.

	In millions
	2021 (1)		2022		Thereafter		Total
Estimated revenues from contracts with customers     from unsatisfied performance obligations as of     September 30, 2021	$	302.0	$	1,091.5	$	7,477.5	$	8,871.0
Operating revenues which are fixed and     determinable (operating leases)	6.0		24.0		201.5		231.5
Total projected operating revenues under committed     firm agreements as of September 30, 2021	$	308.0	$	1,115.5	$	7,679.0	$	9,102.5

(1)The 2021 period is for the three months ending December 31, 2021. For the nine months ended September 30, 2021, the Company recognized $862.0 million of fixed fee revenues for the fulfillment of performance obligations.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping

The carrying amounts and estimated fair values of the Company's financial assets and liabilities which were not recorded at fair value on the Condensed Consolidated Balance Sheets as of September 30, 2021, and December 31, 2020, were as follows (in millions):

As of September 30, 2021				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	147.0		$	147.0	$	—	$	—	$	147.0
Financial Liabilities
Long-term debt	$	3,333.1	(1)	$	—	$	3,699.6	$	—	$	3,699.6

(1)The carrying amount of long-term debt excludes a $5.5 million long-term finance lease obligation and $5.0 million of unamortized debt issuance costs.

As of December 31, 2020				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	2.9		$	2.9	$	—	$	—	$	2.9
Financial Liabilities
Long-term debt	$	3,460.4	(1)	$	—	$	3,847.6	$	—	$	3,847.6

(1)The carrying amount of long-term debt excludes a $6.1 million long-term finance lease obligation and $5.8 million of unamortized debt issuance costs.

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Employee Benefits (Tables)

3 Months Ended

9 Months Ended

Sep. 30, 2021

Sep. 30, 2021

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, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended September 30,				For the Three Months Ended September 30,
	2021		2020		2021		2020
Service cost	$	0.6	$	0.7	$	—	$	—
Interest cost	0.7		0.7		0.3		0.3
Expected return on plan assets	(1.6)		(1.4)		(0.7)		(0.8)
Amortization of unrecognized net loss	0.2		0.8		—		—
Settlement charge	0.6		0.6		—		—
Regulatory asset decrease	0.8		—		—		—
Net periodic benefit cost	$	1.3	$	1.4	$	(0.4)	$	(0.5)

Components of net periodic benefit cost for both the Retirement Plans and PBOP for the nine months ended September 30, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Nine Months Ended September 30,				For the Nine Months Ended September 30,
	2021		2020		2021		2020
Service cost	$	2.0	$	2.1	$	—	$	—
Interest cost	1.6		2.2		0.7		0.9
Expected return on plan assets	(4.7)		(4.7)		(2.0)		(2.4)
Amortization of unrecognized net loss	0.8		1.6		—		—
Settlement charge	1.5		2.2		—		—
Regulatory asset decrease	0.8		—		—		—
Net periodic benefit cost	$	2.0	$	3.4	$	(1.3)	$	(1.5)

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Basis of Presentation (Details)	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percent of Company's Capital Directly and Indirectly Owned by Holding Company	100.00%

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Revenues Disaggregation of Revenue (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segments	Sep. 30, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments (in ones) | segments				1
Revenues from Contracts with Customers		$ 296.4	$ 279.6	$ 959.2	$ 898.0
Other operating revenues	[1]	8.9	8.4	26.0	24.8
Total operating revenues		305.3	288.0	985.2	922.8
Firm Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	[2]	283.2	265.8	913.1	858.1
Interruptible Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		6.5	8.9	25.2	24.6
Other revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		$ 6.7	$ 4.9	$ 20.9	$ 15.3

[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 Company and do not represent revenues earned from contracts with customers.

[2] Revenues earned from contracts with minimum volume commitments (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) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021		Sep. 30, 2020		Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Trade Receivables, net	$ 100.3				$ 115.1
Contracts with Customers, Asset, Gross, Noncurrent	2.2				2.9
Contract Liability Beginning Balance	17.2	[1]	$ 11.8	[2]
Revenues recognized that were included in the contract liability balances at the beginning of the period	(4.2)		(3.3)
Increases due to cash received, excluding amounts recognized as revenues during the period	5.8		9.0
Contract Liability Ending Balance	18.8	[1]	17.5	[2]
Contract with Customer, Liability, Current	4.0		6.0		4.9	$ 2.2
Contract with Customer, Liability, Noncurrent	$ 14.8		$ 11.5		$ 12.3	$ 9.6

[1] As of September 30, 2021, and December 31, 2020, $4.0 million and $4.9 million were recorded in Other Current Liabilities (current portion), and $14.8 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

[2] As of September 30, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Other Current Liabilities (current portion) and $11.5 million and $9.6 million were recorded in Other Liabilities (noncurrent portion).

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Revenues Performance Obligations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Fixed Fee Revenues Recognized	$ 862.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 months	[1]
Estimated revenues from contracts with customers from unsatisfied performance obligations as of September 30, 2021	$ 302.0	[1]
Operating revenues which are fixed and determinable (operating leases)	6.0	[1]
Total projected operating revenues under committed firm agreements as of September 30, 2021	$ 308.0	[1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
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, 2021	$ 1,091.5
Operating revenues which are fixed and determinable (operating leases)	24.0
Total projected operating revenues under committed firm agreements as of September 30, 2021	$ 1,115.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	22 years
Estimated revenues from contracts with customers from unsatisfied performance obligations as of September 30, 2021	$ 7,477.5
Operating revenues which are fixed and determinable (operating leases)	201.5
Total projected operating revenues under committed firm agreements as of September 30, 2021	7,679.0
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, 2021	8,871.0
Operating revenues which are fixed and determinable (operating leases)	231.5
Total projected operating revenues under committed firm agreements as of September 30, 2021	$ 9,102.5

[1] The 2021 period is for the three months ending December 31, 2021. For the nine months ended September 30, 2021, the Company recognized $862.0 million of fixed fee revenues for the fulfillment of performance obligations.

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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, 2021 USD ($) $ / MMBTU MMBTU MMBbls	Dec. 31, 2020 USD ($) $ / MMBTU MMBTU MMBbls
Gas Balancing Arrangements [Abstract]
Gas Balancing Measurement (in MMBtu) | MMBTU	8.4	11.2
Average Market Price of Gas Assumed | $ / MMBTU	4.91	2.45
Gas Imbalance to Subsidiaries Asset Liability | $	$ 41.2	$ 27.4
Natural Gas Liquids Balancing Volume (in MMbbls) | MMBbls	0.0	0.0

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Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2021		Dec. 31, 2020
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	$ 147.0		$ 2.9
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,699.6		3,847.6
Finance Lease, Liability, Noncurrent	5.5		6.1
Unamortized debt issuance costs	5.0		5.8
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	147.0		2.9
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,333.1	[1]	3,460.4	[2]
Fair Value | Fair Value, Inputs, Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	147.0		2.9
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	3,699.6		3,847.6
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 $5.5 million long-term finance lease obligation and $5.0 million of unamortized debt issuance costs.

[2] The carrying amount of long-term debt excludes a $6.1 million long-term finance lease obligation and $5.8 million of unamortized debt issuance costs.

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Commitments and Contingencies Commitments for Construction (Details) $ in Millions	Sep. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Commitment, Remaining Minimum Amount Committed	$ 142.9

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Commitments and Contingencies Asset Purchase (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Asset Acquisition, Purchase Price	$ 20.0

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Financing - Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 3,400.0	$ 3,400.0
Debt, Weighted-Average Interest Rate	4.84%	4.84%
Debt Instrument, Covenant Compliance	As of September 30, 2021, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.
Short-term Debt, Refinanced, Description	The Company has included $300.0 million of notes which mature in less than one year as long-term debt on its Condensed Consolidated Balance Sheets as of September 30, 2021. The Company has the intent and the ability to refinance the notes through the available borrowing capacity under its revolving credit facility as of September 30, 2021.
Unsecured Debt | Gulf South 4.0% Notes Due 2022
Debt Instrument [Line Items]
Short-term Debt, Refinanced, Amount	$ 300.0
Line of Credit
Debt Instrument [Line Items]
Debt, Weighted-Average Interest Rate		1.39%
Line of Credit Facility [Abstract]
Long-term Line of Credit	0.0	$ 130.0
Line of Credit Facility, Remaining Borrowing Capacity	$ 1,000.0
Line of Credit Facility, Covenant Compliance	The Company and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of September 30, 2021.
Line of Credit | Third Amended Credit Agreement - 2015
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,500.0
Line of Credit | Amendment No. 3 Credit Agreement - 2021
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000.0
Maturity Date Extension Term	2 years
Line of Credit Facility, Expiration Date	May 27, 2026

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Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Contribution Plan, Cost	$ 3.1	$ 3.0	$ 9.3	$ 8.8
Retirement Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.6	0.7	2.0	2.1
Interest cost	0.7	0.7	1.6	2.2
Expected return on plan assets	(1.6)	(1.4)	(4.7)	(4.7)
Amortization of unrecognized net loss	0.2	0.8	0.8	1.6
Settlement charge	0.6	0.6	1.5	2.2
Regulatory asset decrease	0.8		0.8
Net periodic benefit cost	1.3	1.4	2.0	3.4
PBOP
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.0	0.0	0.0	0.0
Interest cost	0.3	0.3	0.7	0.9
Expected return on plan assets	(0.7)	(0.8)	(2.0)	(2.4)
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	(0.4)	$ (0.5)	(1.3)	$ (1.5)
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer			4.0
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 1.2		$ 1.2

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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transactions [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	$ 1.4	$ 1.5	$ 4.1	$ 4.3