Boardwalk Pipeline Partners (BWP) 10-Q1 Aug 222022 Q2 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2022	Aug. 01, 2022
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
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	2022
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001336047
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		0

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 505.6	$ 39.1
Receivables:
Trade, net	105.9	126.2
Other	26.8	31.4
Gas transportation receivables	27.6	8
Advances to affiliates	2.7	0
Gas stored underground	26.9	26.1
Prepayments	19.7	21.4
Other current assets	5.3	7.1
Total current assets	720.5	259.3
Property, Plant and Equipment:
Natural gas transmission and other plant	12,482.6	12,248.6
Construction work in progress	96.1	239.5
Property, plant and equipment, gross	12,578.7	12,488.1
Less—accumulated depreciation and amortization	4,097.6	3,947
Property, plant and equipment, net	8,481.1	8,541.1
Other Assets:
Goodwill	237.4	237.4
Gas stored underground	161.5	114
Other	178.1	179.6
Total other assets	577	531
Total Assets	9,778.6	9,331.4
Payables:
Trade	45.9	31.1
Affiliates	4.5	1.7
Other	21.8	20.3
Gas transportation payables	35.5	20
Accrued taxes, other	57.2	65.8
Accrued interest	38.8	32.7
Accrued payroll and employee benefits	27.3	37.4
Construction retainage	13.1	16.6
Regulatory liabilities	54.1	12.7
Current portion of long-term debt	299.9	0
Other current liabilities	22.8	21.4
Total current liabilities	620.9	259.7
Long-term debt and finance lease obligation	3,231.7	3,334.5
Other Liabilities and Deferred Credits:
Pension liability	3.5	5.6
Asset retirement obligations	63.8	61.5
Provision for other asset retirement	90.9	88.2
Other	117.6	112.8
Total other liabilities and deferred credits	275.8	268.1
Commitments and Contingencies
Partners' Capital:
Partners' capital	5,721.7	5,541.7
Accumulated other comprehensive loss	(71.5)	(72.6)
Total partners' capital	5,650.2	5,469.1
Total Liabilities and Partners' Capital	$ 9,778.6	$ 9,331.4

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Revenues:
Transportation	$ 272.8	$ 266.6	$ 598.4	$ 583.8
Storage, parking and lending	32.4	27.6	61.5	55.5
Other	17.7	15.7	40.9	40.6
Total operating revenues	322.9	309.9	700.8	679.9
Operating Costs and Expenses:
Fuel and transportation	7.9	3.9	13.2	13.3
Operation and maintenance	57	49.3	103.9	97.7
Administrative and general	35	34.9	72.5	69.7
Depreciation and amortization	98.4	92	191.6	183
Loss (gain) on sale of assets and impairments	0.8	(0.1)	0.8	(0.2)
Taxes other than income taxes	28.4	25.4	58.3	56.1
Total operating costs and expenses	227.5	205.4	440.3	419.6
Operating income	95.4	104.5	260.5	260.3
Other Deductions (Income):
Interest expense	41.8	40.3	84.3	81
Interest income	(0.1)	0	(0.1)	0
Miscellaneous other income, net	(1.3)	(2.7)	(4.1)	(5.3)
Total other deductions	40.4	37.6	80.1	75.7
Income before income taxes	55	66.9	180.4	184.6
Income taxes	0.2	0.1	0.4	0.3
Net income	$ 54.8	$ 66.8	$ 180	$ 184.3

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 54.8	$ 66.8	$ 180	$ 184.3
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0	0.3	0.4	0.5
Pension and other postretirement benefit costs, net of tax	0.6	0.3	0.7	0.6
Total Comprehensive Income	$ 55.4	$ 67.4	$ 181.1	$ 185.4

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income	$ 180	$ 184.3
Adjustments to reconcile net income to cash provided by operations:
Depreciation and amortization	191.6	183
Amortization of deferred costs and other	3.4	4.2
Loss (gain) on sale of assets and impairments	0.8	(0.2)
Changes in operating assets and liabilities:
Trade and other receivables	24.9	14
Gas transportation receivables and storage assets	(67)	(13.2)
Other assets	1	(7.1)
Trade and other payables	10.2	7.3
Other payables, affiliates	(0.2)	0
Gas transportation payables	15.3	1.2
Accrued liabilities	(11.6)	(16.3)
Regulatory assets and liabilities	44	(5.9)
Other liabilities	0.7	6.8
Net cash provided by operating activities	393.1	358.1
Investing Activities:
Capital expenditures	(121.9)	(138.4)
Proceeds from sale of operating assets	1	0.4
Advances to affiliates	(2.7)	(1.8)
Net cash used in investing activities	(123.6)	(139.8)
Financing Activities:
Proceeds from long-term debt, net of issuance cost	495	0
Repayment of borrowings from long-term debt	(300)	0
Proceeds from borrowings on revolving credit facility	0	150
Repayment of borrowings on revolving credit facility, including financing fees	(0.6)	(284.4)
Principal payment of finance lease obligation	(0.4)	(0.4)
Advances from affiliates	3	(7.5)
Net cash provided by (used in) financing activities	197	(142.3)
Increase in cash and cash equivalents	466.5	76
Cash and cash equivalents at beginning of period	39.1	2.9
Cash and cash equivalents at end of period	$ 505.6	$ 78.9

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL (Unaudited) - USD ($) $ in Millions	Total	Accumulated Other Comprehensive (Loss) Income	Partners' Capital
Beginning balance at Dec. 31, 2020	$ 5,249.1	$ (79.8)	$ 5,328.9
Add (deduct):
Net income	184.3		184.3
Other comprehensive income, net of tax	1.1	1.1
Ending balance at Jun. 30, 2021	5,434.5	(78.7)	5,513.2
Beginning balance at Mar. 31, 2021	5,367.1	(79.3)	5,446.4
Add (deduct):
Net income	66.8		66.8
Other comprehensive income, net of tax	0.6	0.6
Ending balance at Jun. 30, 2021	5,434.5	(78.7)	5,513.2
Beginning balance at Dec. 31, 2021	5,469.1	(72.6)	5,541.7
Add (deduct):
Net income	180		180
Other comprehensive income, net of tax	1.1	1.1
Ending balance at Jun. 30, 2022	5,650.2	(71.5)	5,721.7
Beginning balance at Mar. 31, 2022	5,594.8	(72.1)	5,666.9
Add (deduct):
Net income	54.8		54.8
Other comprehensive income, net of tax	0.6	0.6
Ending balance at Jun. 30, 2022	$ 5,650.2	$ (71.5)	$ 5,721.7

Basis of Presentation

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Boardwalk Pipeline Partners, LP (the Company) is a Delaware limited partnership formed in 2005 to own and operate the business conducted by its primary subsidiary Boardwalk Pipelines, LP (Boardwalk Pipelines) and its operating subsidiaries, which consists of integrated pipeline and storage systems for natural gas and natural gas liquids and other hydrocarbons (herein referred to together as NGLs). As of June 30, 2022, 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 annual 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 June 30, 2022, and December 31, 2021, its results of operations, comprehensive income and changes in partners' capital for the three and six months ended June 30, 2022 and 2021, and its changes in cash flows for the six months ended June 30, 2022 and 2021. 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, 2021 (2021 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 2021 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.

Revenues

Revenues	6 Months Ended
Revenues	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customers	Revenues The Company operates in one reportable segment and contracts directly with end-use customers, including local distribution companies, electric power generators, exporters of liquefied natural gas and industrial users, with producers and marketers of natural gas, and with interstate and intrastate pipelines, who, in turn, provide transportation and storage services for end-users. The following table presents the Company's revenues disaggregated by type of service for the three and six months ended June 30, 2022 and 2021 (in millions): For the For the 2022 2021 2022 2021 Revenues from Contracts with Customers Firm Service (1) $ 295.0 $ 291.7 $ 645.2 $ 629.9 Interruptible Service 11.4 7.3 18.8 18.7 Other revenues 8.1 2.5 20.3 14.2 Total Revenues from Contracts with Customers 314.5 301.5 684.3 662.8 Other operating revenues (2) 8.4 8.4 16.5 17.1 Total Operating Revenues $ 322.9 $ 309.9 $ 700.8 $ 679.9 (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 June 30, 2022, and December 31, 2021, the Company had receivables recorded in Trade Receivables, net from contracts with customers of $105.9 million and $126.2 million, contract assets recorded in Other Assets from contracts with a customer of $2.7 million and $2.3 million, and contract liabilities recorded in Other Current Liabilities (current portion) and Other Liabilities (noncurrent portion) from contracts with customers of $20.9 million and $19.2 million. As of June 30, 2022, contract liabilities are expected to be recognized through 2040. Significant changes in the contract liability balances during the six months ended June 30, 2022, are as follows (in millions): Contract Liabilities Balance as of December 31, 2021 (1) $ 19.2 Revenues recognized that were included in the contract liability (2.6) Increases due to cash received, excluding amounts recognized as 4.3 Balance as of June 30, 2022 (1) $ 20.9 (1) As of June 30, 2022, and December 31, 2021, $3.5 million and $3.6 million were recorded in Other Current Liabilities (current portion), and $17.4 million and $15.6 million were recorded in Other Liabilities (noncurrent portion). Significant changes in the contract liability balances during the six months ended June 30, 2021, are as follows (in millions): Contract Liabilities Balance as of December 31, 2020 (1) $ 17.2 Revenues recognized that were included in the contract liability (2.9) Increases due to cash received, excluding amounts recognized as 4.2 Balance as of June 30, 2021 (1) $ 18.5 (1) As of June 30, 2021, and December 31, 2020, $4.6 million and $4.9 million were recorded in Other Current Liabilities (current portion) and $13.9 million and $12.3 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 June 30, 2022. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, in accordance with firm service contracts. 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; and (b) consideration in contracts that is recognized in revenue as invoiced, such as for interruptible services. 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 2022 (1) 2023 Thereafter Total Estimated revenues from contracts with customers from unsatisfied performance obligations as of June 30, 2022 $ 591.5 $ 1,124.5 $ 6,998.5 $ 8,714.5 Operating revenues which are fixed and 12.0 24.0 177.5 213.5 Total projected operating revenues under committed firm agreements as of June 30, 2022 $ 603.5 $ 1,148.5 $ 7,176.0 $ 8,928.0 (1) The 2022 period is for the remaining six months ending December 31, 2022. For the six months ended June 30, 2022, the Company recognized $607.9 million of fixed fee revenues for the fulfillment of performance obligations.

Gas and Liquids Stored Undergro

Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables	6 Months Ended
	Jun. 30, 2022
Gas Balancing Arrangements [Abstract]
Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables	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 Condensed Consolidated Balance Sheets. 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 June 30, 2022, 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 15.1 trillion British thermal units (TBtu). Assuming an average market price during June 2022 of $7.35 per million British thermal unit (MMBtu), the market value of that gas was approximately $111.0 million. As of December 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 7.4 TBtu. Assuming an average market price during December 2021 of $3.59 per MMBtu, the market value of that gas was approximately $26.6 million. As of June 30, 2022, and December 31, 2021, 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 pay for services provided or 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.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
Fair Value Measurements	Jun. 30, 2022
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 2021 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 June 30, 2022, and December 31, 2021, were as follows (in millions): As of June 30, 2022 Estimated Fair Value Financial Assets Carrying Amount Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 505.6 $ 505.6 $ — $ — $ 505.6 Financial Liabilities Long-term debt $ 3,532.2 (1) $ — $ 3,409.4 $ — $ 3,409.4 (1) The carrying amount of long-term debt, of which $299.9 million is recorded in Current Liabilities , excludes a $4.9 million long-term finance lease obligation and $5.5 million of unamortized debt issuance costs. As of December 31, 2021 Estimated Fair Value Financial Assets Carrying Amount Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 39.1 $ 39.1 $ — $ — $ 39.1 Financial Liabilities Long-term debt $ 3,334.0 (1) $ — $ 3,631.5 $ — $ 3,631.5 (1) The carrying amount of long-term debt excludes a $5.3 million long-term finance lease obligation and $4.8 million of unamortized debt issuance costs.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2022
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 Trial 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 Trial 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 Trial Court denied approval of the Proposed Settlement. On February 11, 2019, a substitute verified class action complaint was filed in this proceeding, which, among other things, added Loews as a Defendant. The Defendants filed a motion to dismiss, which was heard by the Trial Court in July 2019. In October 2019, the Trial Court ruled on the motion and granted a partial dismissal, with certain aspects of the case proceeding to trial. A trial was held the week of February 22, 2021, and post-trial oral arguments were held on July 14, 2021. On November 12, 2021, the Trial Court issued a ruling in the case. The Trial Court held that Boardwalk GP breached the Limited Partnership Agreement and found that Boardwalk GP is liable to the Plaintiffs for approximately $690.0 million in damages, plus pre-judgment interest (approximately $166.0 million), post-judgment interest and attorneys' fees. The Trial Court's ruling and damages award was against Boardwalk GP, and not the Company or its subsidiaries. The Defendants believe that the Trial Court ruling includes factual and legal errors. Therefore, on January 3, 2022, the Defendants appealed the Trial Court's ruling to the Supreme Court of the State of Delaware (the Supreme Court). On January 17, 2022, the Plaintiffs filed a cross-appeal to the Supreme Court contesting the calculation of damages by the Trial Court. Oral arguments have been set for this case on September 14, 2022. City of New Orleans Litigation Gulf South Pipeline Company, LLC (Gulf South), along with several other energy companies operating in Southern Louisiana, has been named as a defendant in a petition for damages and injunctive relief in state district court for Orleans Parish, Louisiana, (Case No. 19-3466) by the City of New Orleans. The case was filed on March 29, 2019. The lawsuit claims include, among other things, negligence, strict liability, nuisance and breach of contract, alleging that the defendants' drilling, dredging, pipeline and industrial operations since the 1930s have caused increased storm surge risk, increased flood protection costs and unspecified damages to the City of New Orleans. In October 2020, this case was stayed pending the outcome of a consolidated appeal to the 5th Circuit Court of Appeals in a similar case. On August 5, 2021, the 5th Circuit Court of Appeals ruled in favor of the oil-and-gas defendants in that consolidated appeal, finding that the two cases being appealed should be re-examined in federal district court since they involve operations that were federally overseen at the time. The ruling reverses a previous decision that allowed the cases to be heard in state court, which the plaintiffs had sought. As a result of the 5th Circuit Court of Appeals' decision, it is anticipated that this case will be reviewed in federal district court to determine whether the case should be heard in that court. Commitments for Construction The Company's future capital commitments are comprised of binding commitments under purchase orders for materials ordered but not received and firm commitments under binding construction service agreements. As of June 30, 2022, the commitments were approximately $125.2 million, all of which are expected to be settled within the next twelve months.

Financing

Financing	6 Months Ended
Financing	Jun. 30, 2022
Debt Disclosure [Abstract]
Financing	Financing Notes and Debentures As of June 30, 2022, and December 31, 2021, the Company had principal amounts of notes and debentures outstanding of $3.6 billion and $3.4 billion, with weighted-average interest rates of 4.72% and 4.84%, of which $300.0 million of the aggregate principal amount was recorded in Current Liabilities . For the six months ended June 30, 2022, the Company completed the following debt issuance (in millions, except interest rates): Date of Issuing Subsidiary Amount of Purchaser Net Interest Maturity Date Interest February 2022 Boardwalk Pipelines $ 500.0 $ 5.0 $ 495.0 (1) 3.60% September 1, 2032 March 1 and September 1 (1) The net proceeds of this offering were used to retire the outstanding $300.0 million aggregate principal amount of Gulf South 4.00% notes due June 2022 on March 21, 2022, to fund growth capital expenditures and for general partnership purposes. 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 June 30, 2022, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants. Revolving Credit Facility As of June 30, 2022, and December 31, 2021, the Company had no outstanding borrowings and all of the $1.0 billion available borrowing capacity under its revolving credit facility. The Company and its subsidiaries were in compliance with all covenant requirements under its revolving credit facility as of June 30, 2022. On June 30, 2022, the Company entered into Amendment No. 4 to Third Amended and Restated Revolving Credit

Employee Benefits

Employee Benefits	6 Months Ended
Employee Benefits	Jun. 30, 2022
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 June 30, 2022 and 2021, were as follows (in millions): Retirement Plans PBOP For the For the 2022 2021 2022 2021 Service cost $ 0.7 $ 0.7 $ — $ — Interest cost 0.5 0.4 0.2 0.2 Expected return on plan assets (1.5) (1.5) (0.5) (0.7) Amortization of unrecognized net loss — 0.3 — — Settlement charge 0.9 0.5 — — Regulatory asset decrease 0.8 — — — Net periodic benefit cost $ 1.4 $ 0.4 $ (0.3) $ (0.5) Components of net periodic benefit cost for both the Retirement Plans and PBOP for the six months ended June 30, 2022 and 2021, were as follows (in millions): Retirement Plans PBOP For the For the 2022 2021 2022 2021 Service cost $ 1.3 $ 1.4 $ — $ — Interest cost 1.1 0.9 0.4 0.4 Expected return on plan assets (3.0) (3.1) (0.9) (1.3) Amortization of unrecognized net loss — 0.6 — — Settlement charge 1.6 0.9 — — Regulatory asset decrease 1.5 — — — Net periodic benefit cost $ 2.5 $ 0.7 $ (0.5) $ (0.9) During the six months ended June 30, 2022, the Company made $1.9 million in contributions to the defined benefit pension plan and expects to fund an additional $1.1 million in the remainder of 2022. 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 for each of the three months ended June 30, 2022 and 2021, and $6.1 million and $6.2 million for the six months ended June 30, 2022 and 2021.

Related Party Transactions

Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2022
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Loews provides a variety of corporate services to the Company under service agreements, including information technology, tax, risk management, internal audit and corporate development services and charges the Company for allocated overheads. The Company incurred charges related to these services of $0.9 million and $1.3 million for the three months ended June 30, 2022 and 2021, and $1.8 million and $2.7 million for the six months ended June 30, 2022 and 2021, which were recorded in Administrative and General on the Condensed Consolidated Statements of Income.

Supplemental Disclosure of Cash

Supplemental Disclosure of Cash Flow Information	6 Months Ended
Supplemental Disclosure of Cash Flow Information	Jun. 30, 2022
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosure of Cash Flow Information	Supplemental Disclosure of Cash Flow Information (in millions): For the 2022 2021 Cash paid during the period for: Interest (net of amount capitalized) $ 73.8 $ 76.6 Non-cash adjustments: Accounts payable and property, plant and equipment 32.3 43.4

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Jun. 30, 2022
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 annual 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 June 30, 2022, and December 31, 2021, its results of operations, comprehensive income and changes in partners' capital for the three and six months ended June 30, 2022 and 2021, and its changes in cash flows for the six months ended June 30, 2022 and 2021. 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, 2021 (2021 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 2021 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.

Gas and Liquids Stored Underg_2

Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables (Policies)	6 Months Ended
	Jun. 30, 2022
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 Condensed Consolidated Balance Sheets.

Revenues (Tables)

Revenues (Tables)	6 Months Ended
Revenues (Tables)	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents the Company's revenues disaggregated by type of service for the three and six months ended June 30, 2022 and 2021 (in millions): For the For the 2022 2021 2022 2021 Revenues from Contracts with Customers Firm Service (1) $ 295.0 $ 291.7 $ 645.2 $ 629.9 Interruptible Service 11.4 7.3 18.8 18.7 Other revenues 8.1 2.5 20.3 14.2 Total Revenues from Contracts with Customers 314.5 301.5 684.3 662.8 Other operating revenues (2) 8.4 8.4 16.5 17.1 Total Operating Revenues $ 322.9 $ 309.9 $ 700.8 $ 679.9 (1) Revenues earned from contracts with minimum volume commitments (MVCs) are included in firm service given the stand-ready nature of the performance obligation and the guaranteed nature of the fees over the contract term. (2) Other operating revenues include certain revenues earned from operating leases, pipeline management fees and other activities that are not considered central and ongoing major business operations of the Company and do not represent revenues earned from contracts with customers.
Contract Liabilities	Significant changes in the contract liability balances during the six months ended June 30, 2022, are as follows (in millions): Contract Liabilities Balance as of December 31, 2021 (1) $ 19.2 Revenues recognized that were included in the contract liability (2.6) Increases due to cash received, excluding amounts recognized as 4.3 Balance as of June 30, 2022 (1) $ 20.9 (1) As of June 30, 2022, and December 31, 2021, $3.5 million and $3.6 million were recorded in Other Current Liabilities (current portion), and $17.4 million and $15.6 million were recorded in Other Liabilities (noncurrent portion). Significant changes in the contract liability balances during the six months ended June 30, 2021, are as follows (in millions): Contract Liabilities Balance as of December 31, 2020 (1) $ 17.2 Revenues recognized that were included in the contract liability (2.9) Increases due to cash received, excluding amounts recognized as 4.2 Balance as of June 30, 2021 (1) $ 18.5 (1) As of June 30, 2021, and December 31, 2020, $4.6 million and $4.9 million were recorded in Other Current Liabilities (current portion) and $13.9 million and $12.3 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 June 30, 2022. The amounts presented primarily consist of fixed fees or MVCs which are typically recognized over time as the performance obligation is satisfied, in accordance with firm service contracts. 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; and (b) consideration in contracts that is recognized in revenue as invoiced, such as for interruptible services. 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 2022 (1) 2023 Thereafter Total Estimated revenues from contracts with customers from unsatisfied performance obligations as of June 30, 2022 $ 591.5 $ 1,124.5 $ 6,998.5 $ 8,714.5 Operating revenues which are fixed and 12.0 24.0 177.5 213.5 Total projected operating revenues under committed firm agreements as of June 30, 2022 $ 603.5 $ 1,148.5 $ 7,176.0 $ 8,928.0 (1) The 2022 period is for the remaining six months ending December 31, 2022. For the six months ended June 30, 2022, the Company recognized $607.9 million of fixed fee revenues for the fulfillment of performance obligations.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
Fair Value Measurements (Tables)	Jun. 30, 2022
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 June 30, 2022, and December 31, 2021, were as follows (in millions): As of June 30, 2022 Estimated Fair Value Financial Assets Carrying Amount Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 505.6 $ 505.6 $ — $ — $ 505.6 Financial Liabilities Long-term debt $ 3,532.2 (1) $ — $ 3,409.4 $ — $ 3,409.4 (1) The carrying amount of long-term debt, of which $299.9 million is recorded in Current Liabilities , excludes a $4.9 million long-term finance lease obligation and $5.5 million of unamortized debt issuance costs. As of December 31, 2021 Estimated Fair Value Financial Assets Carrying Amount Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 39.1 $ 39.1 $ — $ — $ 39.1 Financial Liabilities Long-term debt $ 3,334.0 (1) $ — $ 3,631.5 $ — $ 3,631.5 (1) The carrying amount of long-term debt excludes a $5.3 million long-term finance lease obligation and $4.8 million of unamortized debt issuance costs.

Financing (Tables)

Financing (Tables)	6 Months Ended
Financing (Tables)	Jun. 30, 2022
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	For the six months ended June 30, 2022, the Company completed the following debt issuance (in millions, except interest rates): Date of Issuing Subsidiary Amount of Purchaser Net Interest Maturity Date Interest February 2022 Boardwalk Pipelines $ 500.0 $ 5.0 $ 495.0 (1) 3.60% September 1, 2032 March 1 and September 1 (1) The net proceeds of this offering were used to retire the outstanding $300.0 million aggregate principal amount of Gulf South 4.00% notes due June 2022 on March 21, 2022, to fund growth capital expenditures and for general partnership purposes.

Employee Benefits (Tables)

Employee Benefits (Tables)	3 Months Ended	6 Months Ended
Employee Benefits (Tables)	Jun. 30, 2022	Jun. 30, 2022
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 June 30, 2022 and 2021, were as follows (in millions): Retirement Plans PBOP For the For the 2022 2021 2022 2021 Service cost $ 0.7 $ 0.7 $ — $ — Interest cost 0.5 0.4 0.2 0.2 Expected return on plan assets (1.5) (1.5) (0.5) (0.7) Amortization of unrecognized net loss — 0.3 — — Settlement charge 0.9 0.5 — — Regulatory asset decrease 0.8 — — — Net periodic benefit cost $ 1.4 $ 0.4 $ (0.3) $ (0.5)	Components of net periodic benefit cost for both the Retirement Plans and PBOP for the six months ended June 30, 2022 and 2021, were as follows (in millions): Retirement Plans PBOP For the For the 2022 2021 2022 2021 Service cost $ 1.3 $ 1.4 $ — $ — Interest cost 1.1 0.9 0.4 0.4 Expected return on plan assets (3.0) (3.1) (0.9) (1.3) Amortization of unrecognized net loss — 0.6 — — Settlement charge 1.6 0.9 — — Regulatory asset decrease 1.5 — — — Net periodic benefit cost $ 2.5 $ 0.7 $ (0.5) $ (0.9)

Supplemental Disclosure of Ca_2

Supplemental Disclosure of Cash Flow Information (Tables)	6 Months Ended
Supplemental Disclosure of Cash Flow Information (Tables)	Jun. 30, 2022
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosure of Cash Flow Information	Supplemental Disclosure of Cash Flow Information (in millions): For the 2022 2021 Cash paid during the period for: Interest (net of amount capitalized) $ 73.8 $ 76.6 Non-cash adjustments: Accounts payable and property, plant and equipment 32.3 43.4

Basis of Presentation (Details)

Basis of Presentation (Details)	Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percent of Company's Capital Directly and Indirectly Owned by Holding Company	100%

Revenues Disaggregation of Reve

Revenues Disaggregation of Revenue (Details) $ in Millions		3 Months Ended		6 Months Ended
Revenues Disaggregation of Revenue (Details) $ in Millions		Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segments	Jun. 30, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Number of Reportable Segments (in ones) \| segments				1
Revenues from Contracts with Customers		$ 314.5	$ 301.5	$ 684.3	$ 662.8
Other operating revenues	[1]	8.4	8.4	16.5	17.1
Total operating revenues		322.9	309.9	700.8	679.9
Firm Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers	[2]	295	291.7	645.2	629.9
Interruptible Service
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		11.4	7.3	18.8	18.7
Other revenues
Disaggregation of Revenue [Line Items]
Revenues from Contracts with Customers		$ 8.1	$ 2.5	$ 20.3	$ 14.2

[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.

Revenues Contract Balances (Det

Revenues Contract Balances (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022		Jun. 30, 2021		Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Trade Receivables, net	$ 105.9				$ 126.2
Contracts with Customers, Asset, Gross, Noncurrent	2.7				2.3
Contract Liability Beginning Balance	19.2	[1]	$ 17.2	[2]
Revenues recognized that were included in the contract liability balances at the beginning of the period	(2.6)		(2.9)
Increases due to cash received, excluding amounts recognized as revenues during the period	4.3		4.2
Contract Liability Ending Balance	20.9	[1]	18.5	[2]
Contract with Customer, Liability, Current	3.5		4.6		3.6	$ 4.9
Contract with Customer, Liability, Noncurrent	$ 17.4		$ 13.9		$ 15.6	$ 12.3

[1] As of June 30, 2022, and December 31, 2021, $3.5 million and $3.6 million were recorded in Other Current Liabilities (current portion), and $17.4 million and $15.6 million were recorded in Other Liabilities (noncurrent portion). As of June 30, 2021, and December 31, 2020, $4.6 million and $4.9 million were recorded in Other Current Liabilities (current portion) and $13.9 million and $12.3 million were recorded in Other Liabilities (noncurrent portion).

Revenues Performance Obligation

Revenues Performance Obligations (Details) $ in Millions	6 Months Ended
Revenues Performance Obligations (Details) $ in Millions	Jun. 30, 2022 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Fixed Fee Revenues Recognized	$ 607.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months	[1]
Estimated revenues from contracts with customers from unsatisfied performance obligations as of June 30, 2022	$ 591.5	[1]
Operating revenues which are fixed and determinable (operating leases)	12	[1]
Total projected operating revenues under committed firm agreements as of June 30, 2022	$ 603.5	[1]
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	1 year
Estimated revenues from contracts with customers from unsatisfied performance obligations as of June 30, 2022	$ 1,124.5
Operating revenues which are fixed and determinable (operating leases)	24
Total projected operating revenues under committed firm agreements as of June 30, 2022	$ 1,148.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	20 years
Estimated revenues from contracts with customers from unsatisfied performance obligations as of June 30, 2022	$ 6,998.5
Operating revenues which are fixed and determinable (operating leases)	177.5
Total projected operating revenues under committed firm agreements as of June 30, 2022	7,176
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 June 30, 2022	8,714.5
Operating revenues which are fixed and determinable (operating leases)	213.5
Total projected operating revenues under committed firm agreements as of June 30, 2022	$ 8,928

[1]The 2022 period is for the remaining six months ending December 31, 2022. For the six months ended June 30, 2022, the Company recognized $607.9 million of fixed fee revenues for the fulfillment of performance obligations.

Gas and Liquids Stored Underg_3

Gas and Liquids Stored Underground and Gas and NGLs Receivables and Payables (Details) MMBbls in Millions, MMBTU in Millions, $ in Millions	Jun. 30, 2022 USD ($) $ / MMBTU MMBTU MMBbls	Dec. 31, 2021 USD ($) $ / MMBTU MMBTU MMBbls
Gas Balancing Arrangements [Abstract]
Gas Balancing Measurement (in MMBtu) \| MMBTU	15.1	7.4
Average Market Price of Gas Assumed \| $ / MMBTU	7.35	3.59
Gas Imbalance to Subsidiaries Asset Liability \| $	$ 111	$ 26.6
Natural Gas Liquids Balancing Volume (in MMbbls) \| MMBbls	0	0

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2022		Dec. 31, 2021
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	$ 505.6		$ 39.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,409.4		3,631.5
Finance Lease, Liability, Noncurrent	4.9		5.3
Unamortized debt issuance costs	5.5		4.8
Carrying Amount
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	505.6		39.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,532.2	[1]	3,334	[2]
Fair Value \| Fair Value, Inputs, Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	505.6		39.1
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	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
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	3,409.4		3,631.5
Fair Value \| Fair Value, Inputs, Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and Cash Equivalents, Fair Value	0		0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Debt Instrument, Fair Value Disclosure	$ 0		$ 0

[1] The carrying amount of long-term debt, of which $299.9 million is recorded in Current Liabilities , excludes a $4.9

Commitments and Contingencies L

Commitments and Contingencies Legal Proceedings (Details) - Boardwalk GP, LP $ in Millions	Nov. 12, 2021 USD ($)
Legal damages awarded to other party (approximately)	$ 690
Pre-judgment interest awarded to other party (approximately)	$ 166

Commitments and Contingencies C

Commitments and Contingencies Commitments for Construction (Details) $ in Millions	Jun. 30, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Purchase Commitment, Remaining Minimum Amount Committed	$ 125.2

Financing - Debt (Details)

Financing - Debt (Details) - USD ($) $ in Millions				6 Months Ended
Financing - Debt (Details) - USD ($) $ in Millions		Mar. 21, 2022	Feb. 28, 2022	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Repayment of borrowings from long-term debt				$ 300	$ 0
Unsecured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross				$ 3,600		$ 3,400
Debt, Weighted-Average Interest Rate				4.72%		4.84%
Current portion of long-term debt				$ 300
Debt Instrument, Covenant Compliance				As of June 30, 2022, Boardwalk Pipelines and its operating subsidiaries were in compliance with their debt covenants.
Unsecured Debt \| Boardwalk Pipelines 3.60% Notes Due 2032
Debt Instrument [Line Items]
Debt Instrument, Issuance Date			Feb. 28, 2022
Debt Instrument, Face Amount			$ 500
Payments of Debt Issuance Costs			5
Proceeds from Debt, Net of Issuance Costs	[1]		$ 495
Debt Instrument, Interest Rate, Stated Percentage			3.60%
Debt Instrument, Maturity Date			Sep. 01, 2032
Unsecured Debt \| Gulf South 4.0% Notes Due 2022
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4%
Repayment of borrowings from long-term debt		$ 300
Line of Credit
Line of Credit Facility [Abstract]
Long-term Line of Credit				$ 0		$ 0
Line of Credit Facility, Remaining Borrowing Capacity				$ 1,000		$ 1,000
Line of Credit Facility, Covenant Compliance				The Company and its subsidiaries were in compliance with all covenant requirements under its revolving credit facility as of June 30, 2022.
Line of Credit \| Amendment No. 3 Credit Agreement - 2021
Line of Credit Facility [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,000
Line of Credit \| Amendment No. 4 Credit Agreement - 2022
Debt Instrument [Line Items]
Maturity date extension term				2 years
Line of Credit Facility, Expiration Date				May 27, 2027
Line of Credit Facility [Abstract]
Debt Instrument, Basis Spread on Variable Rate				10%

[1]The net proceeds of this offering were used to retire the outstanding $300.0 million aggregate principal amount of Gulf South 4.00% notes due June 2022 on March 21, 2022, to fund growth capital expenditures and for general partnership purposes.

Employee Benefits (Details)

Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Employee Benefits (Details) - USD ($) $ in Millions	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Contribution Plan, Cost	$ 3.1	$ 3.1	$ 6.1	$ 6.2
Retirement Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.7	0.7	1.3	1.4
Interest cost	0.5	0.4	1.1	0.9
Expected return on plan assets	(1.5)	(1.5)	(3)	(3.1)
Amortization of unrecognized net loss	0	0.3	0	0.6
Settlement charge	0.9	0.5	1.6	0.9
Regulatory asset decrease	0.8	0	1.5	0
Net periodic benefit cost	1.4	0.4	2.5	0.7
PBOP
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	0	0
Interest cost	0.2	0.2	0.4	0.4
Expected return on plan assets	(0.5)	(0.7)	(0.9)	(1.3)
Amortization of unrecognized net loss	0	0	0	0
Settlement charge	0	0	0	0
Regulatory asset decrease	0	0	0	0
Net periodic benefit cost	(0.3)	$ (0.5)	(0.5)	$ (0.9)
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer			1.9
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 1.1		$ 1.1

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Related Party Transactions [Abstract]
Related Party Transaction, Expenses from Transactions with Related Party	$ 0.9	$ 1.3	$ 1.8	$ 2.7

Supplemental Disclosure of Ca_3

Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash paid during the period for:
Interest (net of amount capitalized)	$ 73.8	$ 76.6
Non-cash adjustments:
Accounts payable and property, plant and equipment	$ 32.3	$ 43.4