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 March 31, 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

March 31, 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	9
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	15
Item 3. Quantitative and Qualitative Disclosures About Market Risk	18
Item 4. Controls and Procedures	18
PART II - OTHER INFORMATION
Item 1. Legal Proceedings	19
Item 1A. Risk Factors	19
Item 6. Exhibits	19
Signatures	20

2

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED BALANCE SHEETS

(Millions)

(Unaudited)

ASSETS	March 31, 2021		December 31, 2020
Current Assets:
Cash and cash equivalents	$	17.8	$	2.9
Receivables:
Trade, net	107.4		115.1
Other	23.7		23.4
Gas transportation receivables	6.1		6.6
Prepayments	18.7		18.5
Other current assets	9.4		7.0
Total current assets	183.1		173.5
Property, Plant and Equipment:
Natural gas transmission and other plant	12,029.7		11,964.1
Construction work in progress	183.9		184.2
Property, plant and equipment, gross	12,213.6		12,148.3
Less—accumulated depreciation and amortization	3,685.7		3,598.5
Property, plant and equipment, net	8,527.9		8,549.8
Other Assets:
Goodwill	237.4		237.4
Gas stored underground	114.6		101.9
Other	167.8		167.3
Total other assets	519.8		506.6
Total Assets	$	9,230.8	$	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	March 31, 2021		December 31, 2020
Current Liabilities:
Payables:
Trade	$	64.6	$	43.6
Affiliates	9.8		9.9
Other	14.9		9.6
Gas payables	9.0		10.9
Accrued taxes, other	45.5		70.3
Accrued interest	43.3		33.1
Accrued payroll and employee benefits	19.6		34.5
Regulatory liability	12.9		14.1
Customer deposits	13.1		9.2
Deferred income	4.3		4.9
Other current liabilities	24.0		26.8
Total current liabilities	261.0		266.9
Long-term debt and finance lease obligation	3,341.7		3,460.7
Other Liabilities and Deferred Credits:
Pension liability	16.5		18.0
Asset retirement obligations	58.1		54.9
Provision for other asset retirement	83.3		81.6
Other	103.1		98.7
Total other liabilities and deferred credits	261.0		253.2
Commitments and Contingencies
Partners’ Capital:
Partners' capital	5,446.4		5,328.9
Accumulated other comprehensive loss	(79.3)		(79.8)
Total partners’ capital	5,367.1		5,249.1
Total Liabilities and Partners' Capital	$	9,230.8	$	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 March 31,
	2021		2020
Operating Revenues:
Transportation	$	317.2	$	298.9
Storage, parking and lending	27.9		24.0
Other	24.9		16.9
Total operating revenues	370.0		339.8
Operating Costs and Expenses:
Fuel and transportation	9.4		6.5
Operation and maintenance	48.4		45.7
Administrative and general	34.8		36.1
Depreciation and amortization	91.0		87.7
Gain on sale of assets	(0.1)		—
Taxes other than income taxes	30.7		31.6
Total operating costs and expenses	214.2		207.6
Operating income	155.8		132.2
Other Deductions (Income):
Interest expense	40.7		42.3
Miscellaneous other income, net	(2.6)		(1.2)
Total other deductions	38.1		41.1
Income before income taxes	117.7		91.1
Income taxes	0.2		0.1
Net income	$	117.5	$	91.0

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 March 31,
	2021		2020
Net income	$	117.5	$	91.0
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.2		0.2
Pension and other postretirement benefit costs, net of tax	0.3		0.8
Total Comprehensive Income	$	118.0	$	92.0

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

6

BOARDWALK PIPELINE PARTNERS, LP

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Millions)

(Unaudited)

	For the Three Months Ended March 31,
	2021		2020
OPERATING ACTIVITIES:
Net income	$	117.5	$	91.0
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	91.0		87.7
Amortization of deferred costs and other	2.5		5.4
Gain on sale of assets	(0.1)		—
Changes in operating assets and liabilities:
Trade and other receivables	7.4		(0.2)
Gas receivables and storage assets	(13.2)		(6.0)
Other assets	(0.7)		(0.3)
Trade and other payables	12.4		(12.2)
Gas payables	(1.6)		(2.9)
Accrued liabilities	(29.3)		(26.6)
Regulatory assets and liabilities	(3.4)		7.6
Other liabilities	5.4		4.9
Net cash provided by operating activities	187.9		148.4
INVESTING ACTIVITIES:
Capital expenditures	(52.9)		(100.8)
Proceeds from sale of operating assets	0.2		0.3
Net cash used in investing activities	(52.7)		(100.5)
FINANCING ACTIVITIES:
Proceeds from borrowings on revolving credit agreement	110.0		200.0
Repayment of borrowings on revolving credit agreement	(230.0)		(220.0)
Principal payment of finance lease obligation	(0.2)		(0.2)
Advances from affiliates	(0.1)		—
Net cash used in financing activities	(120.3)		(20.2)
Increase in cash and cash equivalents	14.9		27.7
Cash and cash equivalents at beginning of period	2.9		3.7
Cash and cash equivalents at end of period	$	17.8	$	31.4

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 March 31, 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		91.0		—		91.0
Other comprehensive income, net of tax		—		1.0		1.0
Balance March 31, 2020		$	5,231.6	$	(80.1)	$	5,151.5
	Three Months Ended March 31, 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		117.5		—		117.5
Other comprehensive income, net of tax		—		0.5		0.5
Balance March 31, 2021		$	5,446.4	$	(79.3)	$	5,367.1

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

8

BOARDWALK PIPELINE PARTNERS, LP

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1:  Basis of Presentation

Boardwalk Pipeline Partners, LP (the 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 natural gas and natural gas liquids and other hydrocarbons (herein referred to together as NGLs) pipeline and storage systems. As of March 31, 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 March 31, 2021, and December 31, 2020, and its results of operations, comprehensive income, changes in cash flows and changes in partners' capital for the three months ended March 31, 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 months ended March 31, 2021 and 2020 (in millions):

	For the Three Months Ended March 31,
	2021		2020
Revenues from Contracts with Customers
Firm Service (1)	$	338.2	$	322.4
Interruptible Service	11.4		6.4
Other revenues	11.7		3.1
Total Revenues from Contracts with Customers	361.3		331.9
Other operating revenues (2)	8.7		7.9
Total Operating Revenues	$	370.0	$	339.8

(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.

9

Contract Balances

As of March 31, 2021, and December 31, 2020, the Company had receivables recorded in Trade Receivables from contracts with customers of $107.4 million and $115.1 million, contract assets recorded in Other Assets from contracts with a customer of $3.5 million and $2.9 million and contract liabilities recorded in Deferred income (current portion) and Other Liabilities (noncurrent portion) from contracts with customers of $17.4 million and $17.2 million.

As of March 31, 2021, contract liabilities are expected to be recognized through 2040. Significant changes in the contract liabilities balances during the three months ended March 31, 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     balance at the beginning of the period	(1.3)
Increases due to cash received, excluding amounts recognized as     revenues during the period	1.5
Balance as of March 31, 2021(1)	$	17.4

(1) As of March 31, 2021, and December 31, 2020, $4.3 million and $4.9 million were recorded in Deferred income (current portion) and $13.1 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Significant changes in the contract liabilities balances during the three months ended March 31, 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     balance at the beginning of the period	(0.6)
Increases due to cash received, excluding amounts recognized as     revenues during the period	4.7
Balance as of March 31, 2020(1)	$	15.9

(1) As of March 31, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Deferred income (current portion) and $9.9 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 March 31, 2021. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, as in accordance with firm service contracts. Additionally, for the 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) consideration in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) consideration that was received prior to March 31, 2021, that will be recognized 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.

10

	In millions
	2021 (1)		2022		Thereafter		Total
Estimated revenues from contracts with customers     from unsatisfied performance obligations as of     March 31, 2021	$	825.5	$	1,055.0	$	7,113.5	$	8,994.0
Operating revenues which are fixed and     determinable (operating leases)	17.5		23.0		196.5		237.0
Total projected operating revenues under committed     firm agreements as of March 31, 2021	$	843.0	$	1,078.0	$	7,310.0	$	9,231.0

(1) The 2021 period is for the nine months ending December 31, 2021. For the three months ended March 31, 2021, the Company recognized $316.6 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 March 31, 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 23.5 trillion British thermal units (TBtu). Assuming an average market price during March 2021 of $2.47 per million British thermal unit (MMBtu), the market value of that gas was approximately $58.1 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 March 31, 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 March 31, 2021, and December 31, 2020, were as follows (in millions):

As of March 31, 2021				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.8		$	17.8	$	—	$	—	$	17.8
Financial Liabilities
Long-term debt	$	3,341.3	(1)	$	—	$	3,658.6	$	—	$	3,658.6

(1) The carrying amount of long-term debt excludes a $5.9 million long-term finance lease obligation and

$5.5 million of unamortized debt issuance costs.

11

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 are scheduled for 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 an appeal to the 5th Circuit Court of Appeals in a similar case.

12

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. The commitments as of March 31, 2021, were approximately $168.1 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.

Note 6:  Financing

Notes and Debentures

As of March 31, 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 March 31, 2021, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.

Revolving Credit Facility

Outstanding borrowings under the Company's revolving credit facility as of March 31, 2021, and December 31, 2020, were $10.0 million and $130.0 million, with weighted-average borrowing rates of 1.36% and 1.39%. The Company and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of March 31, 2021. The revolving credit facility has a borrowing capacity of $1.475 billion and expires on May 26, 2022. As of April 30, 2021, the Company had no outstanding borrowings and had the full borrowing capacity available under the revolving credit facility.

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 March 31, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended March 31,				For the Three Months Ended March 31,
	2021		2020		2021		2020
Service cost	$	0.7	$	0.7	$	—	$	—
Interest cost	0.5		0.8		0.2		0.3
Expected return on plan assets	(1.6)		(1.6)		(0.6)		(0.8)
Amortization of unrecognized net loss	0.3		0.4		—		—
Settlement charge	0.4		0.9		—		—
Net periodic benefit cost	$	0.3	$	1.2	$	(0.4)	$	(0.5)

During the three months ended March 31, 2021, the Company made $1.1 million in contributions to the defined benefit pension plan and expects to fund an additional $3.4 million in the remainder of 2021.

13

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 $2.9 million for the three months ended March 31, 2021 and 2020.

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 also charges the Company for allocated overheads. The Company incurred charges related to these services of $1.4 million for the three months ended March 31, 2021 and 2020.

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

	For the Three Months Ended March 31,
	2021		2020
Cash paid during the period for:
Interest (net of amount capitalized)	$	28.3	$	30.1
Non-cash adjustments:
Accounts payable and property, plant and equipment	42.9		47.3

14

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 discussed. 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 Three Months Ended March 31, 2021 and 2020

Our net income for the three months ended March 31, 2021, increased $26.5 million, or 29%, to $117.5 million compared to $91.0 million for the three months ended March 31, 2020, primarily due to the factors discussed below.

Operating revenues for the three months ended March 31, 2021, increased $30.2 million, or 9%, to $370.0 million, compared to $339.8 million for the three months ended March 31, 2020. Including the effect of the items in fuel and transportation expense, operating revenues increased $27.3 million, or 8%. 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, partially offset by higher fuel and transportation expense.

Operating costs and expenses for the three months ended March 31, 2021, increased $6.6 million, or 3%, to $214.2 million, compared to $207.6 million for the three months ended March 31, 2020. Excluding items offset with operating revenues, operating costs and expenses increased $3.7 million or 2% when compared to 2020 primarily due to an increased asset base and the colder winter weather experienced during the first quarter of 2021.

Total other deductions for the three months ended March 31, 2021, decreased $3.0 million, or 7%, to $38.1 million compared to $41.1 million for the three months ended March 31, 2020, primarily due to lower average interest rates, lower average outstanding long-term debt and decreased settlement charges related to the Texas Gas Transmission, LLC (Texas Gas) pension plan.

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, which was filed and declared effective in the first quarter 2021, under which we may publicly issue debt securities, warrants or rights from time to time.

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 March 31, 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. 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):

15

	As of March 31, 2021
Principal amounts guaranteed by Boardwalk Pipeline Partners (1)	$	2,950.0
Principal amounts not guaranteed (2)	400.0
Other (3)	(8.3)
Long-term debt and finance lease obligation	$	3,341.7

(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 excluding any borrowings under the revolving credit facility.

(3) As of March 31, 2021, this represents the amounts related to a finance lease, unamortized debt discount and issuance costs and outstanding borrowings under the revolving credit facility guaranteed by Boardwalk Pipeline Partners.

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 three months ended March 31, 2021 and 2020, were $18.7 million and $39.2 million. Growth capital expenditures were $34.2 million and $61.6 million for the three months ended March 31, 2021 and 2020.

Contractual Obligations

Our principal payments associated with our outstanding debt obligations as of March 31, 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 $39.5 million to $187.9 million for the three months ended March 31, 2021, compared to $148.4 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 $47.8 million to $52.7 million for the three months ended March 31, 2021, compared to $100.5 million for the comparable 2020 period. The decrease was primarily driven by a decrease of $47.9 million in capital spending.

16

Changes in cash flow from financing activities

Net cash used in financing activities increased $100.1 million to $120.3 million for the three months ended March 31, 2021, compared to $20.2 million for the comparable 2020 period primarily due to lower borrowings under the revolving credit facility from lower capital expenditures in 2021 compared to 2020.

Off-Balance Sheet Arrangements

At March 31, 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 recent volatility in energy prices and the coronavirus disease 2019 pandemic, 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.

17

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 March 31, 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 March 31, 2021, that have materially affected or that are reasonably likely to materially affect our internal control over financial reporting. 

18

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).
*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

19

SIGNATURE

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

	Boardwalk Pipeline Partners, LP
	By: Boardwalk GP, LP its general partner
	By: Boardwalk GP, LLC its general partner
May 3, 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)

20

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:	May 3, 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:	May 3, 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 March 31, 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.

May 3, 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 March 31, 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.

May 3, 2021

/s/ Jamie L. Buskill

Jamie L. Buskill

Senior Vice President, Chief Financial and Administrative Officer and Treasurer

(principal financial officer)

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 03, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 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
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001336047
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		0

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 17.8	$ 2.9
Receivables:
Trade, net	107.4	115.1
Other	23.7	23.4
Gas transportation receivables	6.1	6.6
Prepayments	18.7	18.5
Other current assets	9.4	7.0
Total current assets	183.1	173.5
Property, Plant and Equipment:
Natural gas transmission and other plant	12,029.7	11,964.1
Construction work in progress	183.9	184.2
Property, plant and equipment, gross	12,213.6	12,148.3
Less—accumulated depreciation and amortization	3,685.7	3,598.5
Property, plant and equipment, net	8,527.9	8,549.8
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	114.6	101.9
Other	167.8	167.3
Total other assets	519.8	506.6
Total Assets	9,230.8	9,229.9
Payables:
Trade	64.6	43.6
Affiliates	9.8	9.9
Other	14.9	9.6
Gas payables	9.0	10.9
Accrued taxes, other	45.5	70.3
Accrued interest	43.3	33.1
Accrued payroll and employee benefits	19.6	34.5
Regulatory liability	12.9	14.1
Customer deposits	13.1	9.2
Deferred income	4.3	4.9
Other current liabilities	24.0	26.8
Total current liabilities	261.0	266.9
Long-term debt and finance lease obligation	3,341.7	3,460.7
Other Liabilities and Deferred Credits:
Pension liability	16.5	18.0
Asset retirement obligations	58.1	54.9
Provision for other asset retirement	83.3	81.6
Other	103.1	98.7
Total other liabilities and deferred credits	261.0	253.2
Commitments and Contingencies
Partners’ Capital:
Partners' capital	5,446.4	5,328.9
Accumulated other comprehensive loss	(79.3)	(79.8)
Total partners’ capital	5,367.1	5,249.1
Total Liabilities and Partners' Capital	$ 9,230.8	$ 9,229.9

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Revenues:
Transportation	$ 317.2	$ 298.9
Storage, parking and lending	27.9	24.0
Other	24.9	16.9
Total operating revenues	370.0	339.8
Operating Costs and Expenses:
Fuel and transportation	9.4	6.5
Operation and maintenance	48.4	45.7
Administrative and general	34.8	36.1
Depreciation and amortization	91.0	87.7
Gain on sale of assets	(0.1)	0.0
Taxes other than income taxes	30.7	31.6
Total operating costs and expenses	214.2	207.6
Operating income	155.8	132.2
Other Deductions (Income):
Interest expense	40.7	42.3
Miscellaneous other income, net	(2.6)	(1.2)
Total other deductions	38.1	41.1
Income before income taxes	117.7	91.1
Income taxes	0.2	0.1
Net income	$ 117.5	$ 91.0

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 117.5	$ 91.0
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.2	0.2
Pension and other postretirement benefit costs, net of tax	0.3	0.8
Total Comprehensive Income	$ 118.0	$ 92.0

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net income	$ 117.5	$ 91.0
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	91.0	87.7
Amortization of deferred costs and other	2.5	5.4
Gain on sale of assets	(0.1)	0.0
Changes in operating assets and liabilities:
Trade and other receivables	7.4	(0.2)
Gas receivables and storage assets	(13.2)	(6.0)
Other assets	(0.7)	(0.3)
Trade and other payables	12.4	(12.2)
Gas payables	(1.6)	(2.9)
Accrued liabilities	(29.3)	(26.6)
Regulatory assets and liabilities	(3.4)	7.6
Other liabilities	5.4	4.9
Net cash provided by operating activities	187.9	148.4
Investing Activities:
Capital expenditures	(52.9)	(100.8)
Proceeds from sale of operating assets	0.2	0.3
Net cash used in investing activities	(52.7)	(100.5)
Financing Activities:
Proceeds from borrowings on revolving credit agreement	110.0	200.0
Repayment of borrowings on revolving credit agreement	(230.0)	(220.0)
Principal payment of finance lease obligation	(0.2)	(0.2)
Advances from affiliates	(0.1)	0.0
Net cash used in financing activities	(120.3)	(20.2)
Increase in cash and cash equivalents	14.9	27.7
Cash and cash equivalents at beginning of period	2.9	3.7
Cash and cash equivalents at end of period	$ 17.8	$ 31.4

XML

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (Unaudited) - USD ($) $ in Millions	Total	AOCI Attributable to Parent	Partners' Capital
Beginning balance at Dec. 31, 2019	$ 5,059.5	$ (81.1)	$ 5,140.6
Add (deduct):
Net income	91.0		91.0
Other comprehensive income, net of tax	1.0	1.0
Ending balance at Mar. 31, 2020	5,151.5	(80.1)	5,231.6
Beginning balance at Dec. 31, 2020	5,249.1	(79.8)	5,328.9
Add (deduct):
Net income	117.5		117.5
Other comprehensive income, net of tax	0.5	0.5
Ending balance at Mar. 31, 2021	$ 5,367.1	$ (79.3)	$ 5,446.4

XML

Supplemental Disclosure of Cash Flow Information

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosure of Cash Flow Information

Supplemental Disclosure of Cash Flow Information (in millions):

	For the Three Months Ended March 31,
	2021		2020
Cash paid during the period for:
Interest (net of amount capitalized)	$	28.3	$	30.1
Non-cash adjustments:
Accounts payable and property, plant and equipment	42.9		47.3

XML

Supplemental Disclosure of Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental Disclosure of Cash Flow Information (in millions):

	For the Three Months Ended March 31,
	2021		2020
Cash paid during the period for:
Interest (net of amount capitalized)	$	28.3	$	30.1
Non-cash adjustments:
Accounts payable and property, plant and equipment	42.9		47.3

XML

Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash paid during the period for:
Interest (net of amount capitalized)	$ 28.3	$ 30.1
Non-cash adjustments:
Accounts payable and property, plant and equipment	$ 42.9	$ 47.3

XML

Basis of Presentation

3 Months Ended

Mar. 31, 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 natural gas and natural gas liquids and other hydrocarbons (herein referred to together as NGLs) pipeline and storage systems. As of March 31, 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 March 31, 2021, and December 31, 2020, and its results of operations, comprehensive income, changes in cash flows and changes in partners' capital for the three months ended March 31, 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

3 Months Ended

Mar. 31, 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 months ended March 31, 2021 and 2020 (in millions):

	For the Three Months Ended March 31,
	2021		2020
Revenues from Contracts with Customers
Firm Service (1)	$	338.2	$	322.4
Interruptible Service	11.4		6.4
Other revenues	11.7		3.1
Total Revenues from Contracts with Customers	361.3		331.9
Other operating revenues (2)	8.7		7.9
Total Operating Revenues	$	370.0	$	339.8

(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 March 31, 2021, and December 31, 2020, the Company had receivables recorded in Trade Receivables from contracts with customers of $107.4 million and $115.1 million, contract assets recorded in Other Assets from contracts with a customer of $3.5 million and $2.9 million and contract liabilities recorded in Deferred income (current portion) and Other Liabilities (noncurrent portion) from contracts with customers of $17.4 million and $17.2 million.

As of March 31, 2021, contract liabilities are expected to be recognized through 2040. Significant changes in the contract liabilities balances during the three months ended March 31, 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     balance at the beginning of the period	(1.3)
Increases due to cash received, excluding amounts recognized as     revenues during the period	1.5
Balance as of March 31, 2021(1)	$	17.4

(1) As of March 31, 2021, and December 31, 2020, $4.3 million and $4.9 million were recorded in Deferred income (current portion) and $13.1 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Significant changes in the contract liabilities balances during the three months ended March 31, 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     balance at the beginning of the period	(0.6)
Increases due to cash received, excluding amounts recognized as     revenues during the period	4.7
Balance as of March 31, 2020(1)	$	15.9

(1) As of March 31, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Deferred income (current portion) and $9.9 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 March 31, 2021. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, as in accordance with firm service contracts. Additionally, for the 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) consideration in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) consideration that was received prior to March 31, 2021, that will be recognized 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     March 31, 2021	$	825.5	$	1,055.0	$	7,113.5	$	8,994.0
Operating revenues which are fixed and     determinable (operating leases)	17.5		23.0		196.5		237.0
Total projected operating revenues under committed     firm agreements as of March 31, 2021	$	843.0	$	1,078.0	$	7,310.0	$	9,231.0

(1) The 2021 period is for the nine months ending December 31, 2021. For the three months ended March 31, 2021, the Company recognized $316.6 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

3 Months Ended

Mar. 31, 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 March 31, 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 23.5 trillion British thermal units (TBtu). Assuming an average market price during March 2021 of $2.47 per million British thermal unit (MMBtu), the market value of that gas was approximately $58.1 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 March 31, 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

3 Months Ended

Mar. 31, 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 March 31, 2021, and December 31, 2020, were as follows (in millions):

As of March 31, 2021				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.8		$	17.8	$	—	$	—	$	17.8
Financial Liabilities
Long-term debt	$	3,341.3	(1)	$	—	$	3,658.6	$	—	$	3,658.6

(1) The carrying amount of long-term debt excludes a $5.9 million long-term finance lease obligation and

$5.5 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

3 Months Ended

Mar. 31, 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 are scheduled for 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 an appeal to the 5th Circuit Court of Appeals in a similar case.

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. The commitments as of March 31, 2021, were approximately $168.1 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.

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Financing

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Financing

Financing

Notes and Debentures

As of March 31, 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 March 31, 2021, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.

Revolving Credit Facility

Outstanding borrowings under the Company's revolving credit facility as of March 31, 2021, and December 31, 2020, were $10.0 million and $130.0 million, with weighted-average borrowing rates of 1.36% and 1.39%. The Company and its subsidiaries were in compliance with all covenant requirements under the revolving credit facility as of March 31, 2021. The revolving credit facility has a borrowing capacity of $1.475 billion and expires on May 26, 2022. As of April 30, 2021, the Company had no outstanding borrowings and had the full borrowing capacity available under the revolving credit facility.

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Employee Benefits

3 Months Ended

Mar. 31, 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 March 31, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended March 31,				For the Three Months Ended March 31,
	2021		2020		2021		2020
Service cost	$	0.7	$	0.7	$	—	$	—
Interest cost	0.5		0.8		0.2		0.3
Expected return on plan assets	(1.6)		(1.6)		(0.6)		(0.8)
Amortization of unrecognized net loss	0.3		0.4		—		—
Settlement charge	0.4		0.9		—		—
Net periodic benefit cost	$	0.3	$	1.2	$	(0.4)	$	(0.5)

During the three months ended March 31, 2021, the Company made $1.1 million in contributions to the defined benefit pension plan and expects to fund an additional $3.4 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 $2.9 million for the three months ended March 31, 2021 and 2020.

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Related Party Transactions	3 Months Ended
	Mar. 31, 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 also charges the Company for allocated overheads. The Company incurred charges related to these services of $1.4 million for the three months ended March 31, 2021 and 2020.

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Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 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 March 31, 2021, and December 31, 2020, and its results of operations, comprehensive income, changes in cash flows and changes in partners' capital for the three months ended March 31, 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)	3 Months Ended
	Mar. 31, 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)

3 Months Ended

Mar. 31, 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 months ended March 31, 2021 and 2020 (in millions):

	For the Three Months Ended March 31,
	2021		2020
Revenues from Contracts with Customers
Firm Service (1)	$	338.2	$	322.4
Interruptible Service	11.4		6.4
Other revenues	11.7		3.1
Total Revenues from Contracts with Customers	361.3		331.9
Other operating revenues (2)	8.7		7.9
Total Operating Revenues	$	370.0	$	339.8

(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 liabilities balances during the three months ended March 31, 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     balance at the beginning of the period	(1.3)
Increases due to cash received, excluding amounts recognized as     revenues during the period	1.5
Balance as of March 31, 2021(1)	$	17.4

(1) As of March 31, 2021, and December 31, 2020, $4.3 million and $4.9 million were recorded in Deferred income (current portion) and $13.1 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Significant changes in the contract liabilities balances during the three months ended March 31, 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     balance at the beginning of the period	(0.6)
Increases due to cash received, excluding amounts recognized as     revenues during the period	4.7
Balance as of March 31, 2020(1)	$	15.9

(1) As of March 31, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Deferred income (current portion) and $9.9 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 March 31, 2021. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, as in accordance with firm service contracts. Additionally, for the 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) consideration in contracts that are recognized in revenue as invoiced, such as for interruptible services; and (c) consideration that was received prior to March 31, 2021, that will be recognized 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     March 31, 2021	$	825.5	$	1,055.0	$	7,113.5	$	8,994.0
Operating revenues which are fixed and     determinable (operating leases)	17.5		23.0		196.5		237.0
Total projected operating revenues under committed     firm agreements as of March 31, 2021	$	843.0	$	1,078.0	$	7,310.0	$	9,231.0

(1) The 2021 period is for the nine months ending December 31, 2021. For the three months ended March 31, 2021, the Company recognized $316.6 million of fixed fee revenues for the fulfillment of performance obligations.

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2021, and December 31, 2020, were as follows (in millions):

As of March 31, 2021				Estimated Fair Value
Financial Assets	Carrying Amount			Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	17.8		$	17.8	$	—	$	—	$	17.8
Financial Liabilities
Long-term debt	$	3,341.3	(1)	$	—	$	3,658.6	$	—	$	3,658.6

(1) The carrying amount of long-term debt excludes a $5.9 million long-term finance lease obligation and

$5.5 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

Mar. 31, 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 March 31, 2021 and 2020, were as follows (in millions):

	Retirement Plans				PBOP
	For the Three Months Ended March 31,				For the Three Months Ended March 31,
	2021		2020		2021		2020
Service cost	$	0.7	$	0.7	$	—	$	—
Interest cost	0.5		0.8		0.2		0.3
Expected return on plan assets	(1.6)		(1.6)		(0.6)		(0.8)
Amortization of unrecognized net loss	0.3		0.4		—		—
Settlement charge	0.4		0.9		—		—
Net periodic benefit cost	$	0.3	$	1.2	$	(0.4)	$	(0.5)

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Basis of Presentation (Details)	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage 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
		Mar. 31, 2021 USD ($) segments	Mar. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments (in ones) | segments		1
Revenues from Contracts with Customers		$ 361.3	$ 331.9
Other operating revenues	[1]	8.7	7.9
Total operating revenues		370.0	339.8
Firm Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	[2]	338.2	322.4
Interruptible Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		11.4	6.4
Other revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		$ 11.7	$ 3.1

[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	3 Months Ended
	Mar. 31, 2021		Mar. 31, 2020		Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Trade Receivables, net	$ 107.4				$ 115.1
Contracts with Customers, Asset, Gross, Noncurrent	3.5				2.9
Contract Liability Beginning Balance	17.2	[1]	$ 11.8	[2]
Revenues recognized that were included in the contract liability balance at the beginning of the period	(1.3)		(0.6)
Increases due to cash received, excluding amounts recognized as revenues during the period	1.5		4.7
Contract Liability Ending Balance	17.4	[1]	15.9	[2]
Contract with Customer, Liability, Current	4.3		6.0		4.9	$ 2.2
Contract with Customer, Liability, Noncurrent	$ 13.1		$ 9.9		$ 12.3	$ 9.6

[1] As of March 31, 2021, and December 31, 2020, $4.3 million and $4.9 million were recorded in Deferred income (current portion) and $13.1 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

[2] As of March 31, 2020, and December 31, 2019, $6.0 million and $2.2 million were recorded in Deferred income (current portion) and $9.9 million and $9.6 million were recorded in Other Liabilities (noncurrent portion).

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Revenues Performance Obligations (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Fixed Fee Revenues Recognized	$ 316.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	9 months	[1]
Estimated revenues from contracts with customers from unsatisfied performance obligations as of March 31, 2021	$ 825.5	[1]
Operating revenues which are fixed and determinable (operating leases)	17.5	[1]
Total projected operating revenues under committed firm agreements as of March 31, 2021	$ 843.0	[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 March 31, 2021	$ 1,055.0
Operating revenues which are fixed and determinable (operating leases)	23.0
Total projected operating revenues under committed firm agreements as of March 31, 2021	$ 1,078.0
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 March 31, 2021	$ 7,113.5
Operating revenues which are fixed and determinable (operating leases)	196.5
Total projected operating revenues under committed firm agreements as of March 31, 2021	7,310.0
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 March 31, 2021	8,994.0
Operating revenues which are fixed and determinable (operating leases)	237.0
Total projected operating revenues under committed firm agreements as of March 31, 2021	$ 9,231.0

[1] The 2021 period is for the nine months ending December 31, 2021. For the three months ended March 31, 2021, the Company recognized $316.6 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	Mar. 31, 2021 USD ($) $ / MMBTU MMBTU MMBbls	Dec. 31, 2020 USD ($) $ / MMBTU MMBTU MMBbls
Gas Balancing Arrangements [Abstract]
Gas Balancing Measurement (in MMBtu) | MMBTU	23.5	11.2
Average Market Price of Gas Assumed | $ / MMBTU	2.47	2.45
Gas Imbalance to Subsidiaries Asset Liability | $	$ 58.1	$ 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	Mar. 31, 2021		Dec. 31, 2020
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	$ 17.8		$ 2.9
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,658.6		3,847.6
Finance Lease, Liability, Noncurrent	5.9		6.1
Unamortized debt issuance costs	5.5		5.8
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	17.8		2.9
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,341.3	[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	17.8		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	3,658.6		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 $5.9 million long-term finance lease obligation and $5.5 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	Mar. 31, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Commitment, Remaining Minimum Amount Committed	$ 168.1

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Financing - Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt and finance lease obligation	$ 3,341.7		$ 3,460.7
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 March 31, 2021, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.
Line of Credit
Debt Instrument [Line Items]
Debt, Weighted-Average Interest Rate	1.36%		1.39%
Line of Credit Facility [Abstract]
Long-term Line of Credit	$ 10.0		$ 130.0
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 March 31, 2021.
Line of Credit | Amendment No. 2 Credit Agreement - 2017
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,475.0
Line of Credit Facility, Expiration Date	May 26, 2022
Line of Credit | Subsequent Event
Line of Credit Facility [Abstract]
Long-term Line of Credit		$ 0.0
Line of Credit Facility, Remaining Borrowing Capacity		$ 1,475.0

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Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Contribution Plan, Cost	$ 3.1	$ 2.9
Retirement Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.7	0.7
Interest cost	0.5	0.8
Expected return on plan assets	(1.6)	(1.6)
Amortization of unrecognized net loss	0.3	0.4
Settlement charge	0.4	0.9
Net periodic benefit cost	0.3	1.2
PBOP
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.0	0.0
Interest cost	0.2	0.3
Expected return on plan assets	(0.6)	(0.8)
Amortization of unrecognized net loss	0.0	0.0
Settlement charge	0.0	0.0
Net periodic benefit cost	(0.4)	$ (0.5)
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	1.1
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 3.4

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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Related Party Transactions [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	$ 1.4	$ 1.4