Murphy USA (MUSA) 10-Q9 May 242024 Q1 Quarterly reportFinancial data

Company Profile

Cover

Cover	3 Months Ended
Cover	Mar. 31, 2024 shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Transition Report	false
Entity File Number	001-35914
Entity Registrant Name	MURPHY USA INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-2279221
Entity Address, Address Line One	200 Peach Street
Entity Address, City or Town	El Dorado,
Entity Address, State or Province	AR
Entity Address, Postal Zip Code	71730-5836
City Area Code	870
Local Phone Number	875-7600
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	MUSA
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	20,717,691
Amendment Flag	false
Entity Central Index Key	0001573516
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 56.7	$ 117.8
Marketable securities, current	6.1	7.1
Accounts receivable—trade, less allowance for doubtful accounts of $1.3 at 2024 and 2023, respectively	380.5	336.7
Inventories, at lower of cost or market	292.7	341.2
Prepaid expenses and other current assets	31.7	23.7
Total current assets	767.7	826.5
Marketable securities, non-current	4.5	4.4
Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,784.2 and $1,739.2 at 2024 and 2023, respectively	2,593.7	2,571.8
Operating lease right of use assets, net	452.8	452.1
Intangible assets, net of amortization	139.7	139.8
Goodwill	328	328
Other assets	20.6	17.5
Total assets	4,307	4,340.1
Current liabilities
Current maturities of long-term debt	15.3	15
Trade accounts payable and accrued liabilities	830	834.7
Income taxes payable	39.4	23.1
Total current liabilities	884.7	872.8
Long-term debt, including capitalized lease obligations	1,783.1	1,784.7
Deferred income taxes	329	329.5
Asset retirement obligations	45.8	46.1
Non-current operating lease liabilities	452.1	450.3
Deferred credits and other liabilities	30.7	27.8
Total liabilities	3,525.4	3,511.2
Stockholders' Equity
Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding)	0	0
Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at 2024 and 2023, respectively)	0.5	0.5
Treasury stock (26,049,473 and 25,929,836 shares held at 2024 and 2023, respectively)	(3,033.7)	(2,957.8)
Additional paid in capital (APIC)	479.6	508.1
Retained earnings	3,335.2	3,278.1
Total stockholders' equity	781.6	828.9
Total liabilities and stockholders' equity	$ 4,307	$ 4,340.1

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1.3	$ 1.3
Property, plant and equipment, accumulated depreciation and amortization	$ 1,784.2	$ 1,739.2
Stockholders' Equity
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)	20,000,000	20,000,000
Preferred stock shares outstanding (in shares)	0	0
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	200,000,000	200,000,000
Common stock shares issued (in shares)	46,767,164	46,767,164
Treasury stock, shares held (in shares)	26,049,473	25,929,836

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Operating Revenues
Total operating revenues		$ 4,843.7	$ 5,077.2
Operating Expenses
Store and other operating expenses		252.1	238.3
Depreciation and amortization		58.7	56.4
Selling, general and administrative		62.1	59
Accretion of asset retirement obligations		0.8	0.8
Total operating expenses		4,738.9	4,914.2
Gain (loss) on sale of assets		0.4	(0.2)
Income (loss) from operations		105.2	162.8
Other income (expense)
Investment income		1.2	0.8
Interest expense		(24.9)	(24.9)
Other nonoperating income (expense)		0.4	0.3
Total other income (expense)		(23.3)	(23.8)
Income before income taxes		81.9	139
Income tax expense (benefit)		15.9	32.7
Net Income		$ 66	$ 106.3
Basic and Diluted Earnings Per Common Share
Basic (in dollars per share)		$ 3.17	$ 4.89
Diluted (in dollars per share)		$ 3.12	$ 4.80
Weighted-Average Common Shares Outstanding (in thousands):
Basic (in shares)		20,814	21,739
Diluted (in shares)		21,162	22,133
Supplemental information:
Includes excise taxes of		$ 558.8	$ 544.8
Petroleum product sales
Operating Revenues
Total operating revenues	[1]	3,811.7	3,994.2
Operating Expenses
Operating expenses		3,556.1	3,780.6
Merchandise sales
Operating Revenues
Total operating revenues		1,000.7	966.2
Operating Expenses
Operating expenses		809.1	779.1
Other operating revenues
Operating Revenues
Total operating revenues		$ 31.3	$ 116.8

[1]Includes excise taxes of $558.8 million and $544.8 million for the threethree months ended March 31, 2024 and 2023, respectively.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 66	$ 106.3
Reclassifications:
Amortization of unrealized (gain) loss to interest expense	0	0.2
Other comprehensive income (loss)	0	0.2
Comprehensive income	$ 66	$ 106.5

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Operating Activities
Net income	$ 66	$ 106.3
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	58.7	56.4
Deferred and noncurrent income tax charges (benefits)	(0.5)	6.6
Accretion of asset retirement obligations	0.8	0.8	$ 3
Amortization of discount on marketable securities	(0.1)	0
(Gains) losses from sale of assets	(0.4)	0.2
Net (increase) decrease in noncash operating working capital	4.2	(30.4)
Other operating activities - net	7.3	9.8
Net cash provided (required) by operating activities	136	149.7
Investing Activities
Property additions	(76.2)	(72.7)
Proceeds from sale of assets	1	0
Redemptions of marketable securities	1	4.5
Other investing activities - net	(0.7)	(0.8)
Net cash provided (required) by investing activities	(74.9)	(69)
Financing Activities
Purchase of treasury stock	(86.4)	(13.7)
Dividends paid	(8.8)	(8.1)
Borrowings of debt	0	8
Repayments of debt	(3.9)	(11.8)
Amounts related to share-based compensation	(23.1)	(13.5)
Net cash provided (required) by financing activities	(122.2)	(39.1)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(61.1)	41.6
Cash, cash equivalents, and restricted cash at beginning of period	117.8	60.5	60.5
Cash, cash equivalents, and restricted cash at end of period	$ 56.7	$ 102.1	$ 117.8

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (unaudited) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	APIC	Retained Earnings	AOCI
Beginning balance (in shares) at Dec. 31, 2022		46,767,164
Beginning balance at Dec. 31, 2022	$ 640.7	$ 0.5	$ (2,633.3)	$ 518.9	$ 2,755.1	$ (0.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	106.3				106.3
Gain on interest rate hedge and unrealized gain on marketable securities, net of tax	0.2					0.2
Cash dividends declared	(8.1)				(8.1)
Dividend equivalent units accrued	0			0.1	(0.1)
Purchase of treasury stock	(13.7)		(13.7)
Issuance of treasury stock	0		8.7	(8.7)
Amounts related to share-based compensation	(13.5)			(13.5)
Share-based compensation expense	4.9			4.9
Ending balance (in shares) at Mar. 31, 2023		46,767,164
Ending balance at Mar. 31, 2023	$ 716.8	$ 0.5	(2,638.3)	501.7	2,853.2	(0.3)
Beginning balance (in shares) at Dec. 31, 2023	46,767,164	46,767,164
Beginning balance at Dec. 31, 2023	$ 828.9	$ 0.5	(2,957.8)	508.1	3,278.1	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	66				66
Gain on interest rate hedge and unrealized gain on marketable securities, net of tax	0
Cash dividends declared	(8.8)				(8.8)
Dividend equivalent units accrued	0			0.1	(0.1)
Purchase of treasury stock	(86.9)		(86.9)
Issuance of treasury stock	(0.1)		11	(11.1)
Amounts related to share-based compensation	(23.1)			(23.1)
Share-based compensation expense	$ 5.6			5.6
Ending balance (in shares) at Mar. 31, 2024	46,767,164	46,767,164
Ending balance at Mar. 31, 2024	$ 781.6	$ 0.5	$ (3,033.7)	$ 479.6	$ 3,335.2	$ 0

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.42	$ 0.37

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
Description of Business and Basis of Presentation	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of business — Murphy USA Inc. and its consolidated subsidiaries (“Murphy USA”, "we", "our", "us" or the “Company”) markets refined products through a network of retail gasoline stores and to unbranded wholesale customers. In addition, we operate non-fuel convenience stores in select markets. The Company owns and operates a chain of retail stores under the brand names of Murphy USA ® and Murphy Express, most of which are located in close proximity to Walmart stores, and also has a mix of convenience stores with and without retail gasoline that operate under the brand name of QuickChek ® . At March 31, 2024, the Company had a total of 1,733 Company stores of which 1,579 were branded as Murphy and 154 were the QuickChek brand. The Company also has certain product supply and wholesale assets, including product distribution terminals and pipeline positions. Basis of Presentation — Murphy USA was incorporated in March 2013 and, in connection with its incorporation, Murphy USA issued 100 shares of common stock, par value $0.01 per share, to Murphy Oil Corporation (“Murphy Oil”) for $1.00. On August 30, 2013, Murphy USA was separated from Murphy Oil through the distribution of 100% of the common stock of Murphy USA to holders of Murphy Oil stock. Murphy USA Inc., Murphy Oil USA, Inc. and certain of its subsidiaries operate on a calendar year basis, while the QuickChek subsidiary uses a weekly retail calendar where each quarter has 13 weeks. For the three month period ended March 31, 2024, the QuickChek results cover the period December 30, 2023 to March 29, 2024 and for the three month period ended March 31, 2023, the QuickChek results cover the period December 31, 2022 to March 31, 2023. The difference in timing of the period ends is immaterial to the overall consolidated results. In preparing the financial statements of Murphy USA in conformity with accounting principles generally accepted in the United States, management has made a number of estimates and assumptions related to the reporting of assets, liabilities, revenues, expenses and the disclosure of contingent assets and liabilities. Actual results may differ from these estimates. Interim Financial Information — The interim period financial information presented in these consolidated financial statements is unaudited and includes all known accruals and adjustments, in the opinion of management, necessary for a fair presentation of the consolidated financial position of Murphy USA and its results of operations and cash flows for the periods presented. All such adjustments are of a normal and recurring nature. These interim consolidated financial statements should be read together with our audited financial statements for the years ended December 31, 2023, 2022 and 2021, included in our Annual Report on Form 10-K (File No. 001-35914), as filed with the Securities and Exchange Commission under the Securities Exchange Act of 1934 on February 16, 2024. Recently Issued Accounting Standards — In December 2023, the FASB issued ASU 2023-07, "Segment Reporting: Improvements to Reportable Segment Disclosures." The amendments in this Update improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities and clarifies that single reportable segment entities must apply Topic 280 in its entirety. The amendments in this Update for annual disclosures were effective for the Company on January 1, 2024, and the interim disclosures will be effective for the year beginning January 1, 2025, with early adoption permitted. The amendments will be applied retrospectively to all prior periods presented in the financial statement. The Company has determined this will not have a material impact on the Company's consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, "Improvements to Income Tax Disclosures." This ASU intends to enhance income tax disclosures, under Topic 740, to address investor requests for more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The amendments in this Update improve the transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. The amendments in this Update are effective for the Company for the year beginning January 1, 2025, with early adoption permitted. The

Revenues

Revenues	3 Months Ended
Revenues	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Revenues	Revenues Revenue Recognition Revenue is recognized when obligations under the terms of a contract with our customers are satisfied; generally, this occurs with the transfer of control of our petroleum products, convenience merchandise, Renewable Identification Numbers ("RINs") and other assets to our third-party customers. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. Excise and sales tax that we collect where we have determined we are the principal in the transaction have been recorded as revenue on a jurisdiction-by-jurisdiction basis. The Company enters into buy/sell and similar arrangements when petroleum products are held at one location but are needed at a different location. The Company often pays or receives funds related to the buy/sell arrangements based on location or quality differences. The Company accounts for such transactions as non-monetary exchanges under existing accounting guidance and typically reports these on a net basis in the Consolidated Statements of Income. The following tables disaggregate our revenues by major source for the three months ended March 31, 2024 and 2023, respectively: Three Months Ended March 31, 2024 Three Months Ended March 31, 2023 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 3,427.6 — $ 3,427.6 $ 3,586.1 $ — $ 3,586.1 Petroleum product sales (at wholesale) 1 384.1 — 384.1 408.1 — 408.1 Total petroleum product sales 3,811.7 — 3,811.7 3,994.2 — 3,994.2 Merchandise sales 1,000.7 — 1,000.7 966.2 966.2 Other operating revenues: RINs 29.4 — 29.4 115.3 115.3 Other revenues 2 1.8 0.1 1.9 1.4 0.1 1.5 Total revenues $ 4,843.6 $ 0.1 $ 4,843.7 $ 5,077.1 $ 0.1 $ 5,077.2 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes combined with other miscellaneous items Marketing segment Petroleum product sales (at retail). For our retail store locations, the revenue related to petroleum product sales is recognized as the fuel is pumped to our customers. The transaction price at the pump typically includes some portion of sales or excise taxes as levied in the respective jurisdictions. Those taxes that are collected for remittance to governmental entities on a pass-through basis are not recognized as revenue and they are recorded to a liability account until they are paid. Our customers typically use a mixture of cash, checks, credit cards and debit cards to pay for our products as they are received. We have accounts receivable from the various credit/debit card providers at any point in time related to product sales made on credit cards and debit cards. These receivables are typically collected in two Petroleum product sales (at wholesale). Our sales of petroleum products at wholesale are generally recorded as revenue when the deliveries have occurred and legal ownership of the product has transferred to the customer. Title transfer for bulk refined product sales typically occurs at pipeline custody points and upon trucks loading at product terminals. For bulk pipeline sales, we record receivables from customers that are generally collected within a week from custody transfer date. For our rack product sales, the majority of our customers' accounts are drafted by us within 10 days from product transfer. Merchandise sales. For our retail store locations, the revenue related to merchandise sales is recognized as the customer completes their purchase at our locations. The transaction price typically includes some portion of sales tax as levied in the respective jurisdictions. Those taxes that are collected for remittance to governmental entities on a pass-through basis are not recognized as revenue and they are recorded to a liability account until they are paid. As noted above, a mixture of payment types are used for these revenues and the same terms for credit/debit card receivables are realized. With respect to merchandise sales revenue we must determine whether we are the principal or agent for some categories of merchandise such as scratch-off lottery tickets, lotto tickets, newspapers and other small categories of merchandise. For scratch-off lottery tickets, we have determined we are the principal in the majority of the jurisdictions and therefore we record those sales on a gross basis. We have some categories of merchandise (such as lotto tickets) where we are the agent and the revenues recorded for those transactions are our net commission only. The Company offers loyalty programs through each of its branded retail locations. The customers earn rewards based on their spending or other promotional activities. These programs create a performance obligation which requires us to defer a portion of sales revenue to the loyalty program participants until they redeem their rewards. The rewards may be redeemed for free or discounted merchandise or cash discounts at all stores and on fuel purchases at Murphy branded stores. Earned rewards expire after an account is inactive for a period of 90 days at Murphy branded stores, while certain QuickChek rewards require use within the month. We recognize loyalty revenue when a customer redeems an earned reward. Deferred revenue associated with both rewards programs are included in Trade accounts payable and accrued liabilities in our Consolidated Balance Sheets. The deferred revenue balances at March 31, 2024 and December 31, 2023 were immaterial. RINs sales. For the sale of RINs, we recognize revenue when the RIN is transferred to the counter-party and the sale is completed. Receivables from our counter-parties related to the RIN sales are typically collected within five days of the sale. Other revenues. Items reported as other operating revenues include collection allowances for excise and sales tax and other miscellaneous items and are recognized as revenue when the transaction is completed. Accounts receivable

Inventories

Inventories	3 Months Ended
Inventories	Mar. 31, 2024
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consisted of the following: (Millions of dollars) March 31, December 31, Petroleum products - FIFO basis $ 356.8 $ 331.2 Store merchandise for resale - FIFO basis 198.0 209.1 Less LIFO reserve (274.3) (212.1) Total petroleum products and store merchandise inventory 280.5 328.2 Materials and supplies 12.2 13.0 Total inventories $ 292.7 $ 341.2 At March 31, 2024 and December 31, 2023, the replacement cost (market value) of LIFO inventories exceeded the LIFO carrying value for petroleum products by $271.6 million and $209.7 million, respectively and store merchandise for resale by $2.7 million and $2.4 million, respectively.

Marketable Securities

Marketable Securities	3 Months Ended
Marketable Securities	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities The Company invests a portion of its excess operational cash in marketable securities. The goal of the Company's investment policy, in order of priority, are as follows: (1) preservation of principal, (2) maintaining a high degree of liquidity to meet cash flow requirements, and (3) deliver competitive returns subject to prevailing market conditions and the Company's stated objectives related to safety and liquidity. Nothing in the policy is intended to indicate that management must invest excess operational cash; it allows it to be subject to specific limitations. Securities are generally required to have a final maturity of 24 months or less with a weighted average maturity for the portfolio of no longer than 12 months and must have an active secondary market. Investments may include U.S. Treasury bills, notes and bonds, U.S. Agency securities, repurchase agreements, certificates of deposit, institutional, government money market funds that maintain a stable $1.00 net asset value, domestic and foreign commercial paper, municipal securities, domestic and foreign debt issued by corporations or financial institutions with the primary objective of minimizing the potential risk of principal loss. The Company determines the classification of its marketable securities based on its investment strategy at the time of purchase. All marketable securities in the periods presented have been classified as available-for-sale. The amortized cost and carrying value (fair value) of marketable securities and the balance sheet location at March 31, 2024 and December 31, 2023 consisted of the following: March 31, 2024 (Millions of dollars) Amortized Gross Gross Estimated Available-for-sale securities: Marketable securities current U.S. Government bonds $ 3.0 $ — — $ 3.0 U.S. Corporate bonds 3.0 — — 3.0 Investment income receivable 0.1 — — 0.1 6.1 — — 6.1 Marketable securities non-current U.S. Corporate bonds 3.0 — — 3.0 Non U.S. Corporate bonds 1.5 — — 1.5 4.5 — — 4.5 Total marketable securities $ 10.6 $ — $ — $ 10.6 December 31, 2023 (Millions of dollars) Amortized Gross Gross Estimated Available-for-sale securities: Marketable securities current U.S. Government bonds $ 3.0 $ — $ — $ 3.0 U.S. Corporate bonds 3.9 — — 3.9 Investment income receivable 0.2 — — 0.2 7.1 — — 7.1 Marketable securities non-current U.S. Corporate bonds 2.9 — — 2.9 Non U.S. Corporate bonds 1.5 — — 1.5 4.4 — — 4.4 Total marketable securities $ 11.5 $ — $ — $ 11.5 The amortized cost basis and fair value of the Company's available-for-sale marketable securities, excluding Investment income receivable, at March 31, 2024, by contractual maturity, are as follows: (Millions of dollars ) Amortized Cost Fair Value Less than 1 year $ 10.5 $ 10.5 There was no impairment on any available-for-sale marketable securities as of March 31, 2024 or December 31, 2023.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
Goodwill and Intangible Assets	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The Company's goodwill is assigned to its Marketing segment and none of the goodwill is deductible for tax purposes. (Millions of dollars) March 31, December 31, Goodwill $ 328.0 $ 328.0 We amortize intangible assets subject to amortization on a straight-line basis based on the period for which the economic benefits of the asset or liability are expected to be realized. The intangible assets subject to amortization includes pipeline space, which is being amortized over a 40-year life, and the intangible lease liability acquired from QuickChek that is being amortized over the remaining life of the underlying leases. Intangible assets subject to amortization at March 31, 2024 and December 31, 2023 consisted of the following: Remaining Useful Life (in years) March 31, 2024 December 31, 2023 (Millions of dollars) Cost Net Cost Net Intangible assets subject to amortization: Pipeline space 31.4 $ 39.6 $ 31.4 $ 39.6 $ 31.7 Intangible lease liability 10.2 (9.1) (7.1) (9.1) (7.3) Total intangible assets subject to amortization 30.5 24.3 30.5 24.4 Intangible assets not subject to amortization, indefinite lives: Trade name 115.4 115.4 115.4 115.4 Intangible assets, net of amortization $ 145.9 $ 139.7 $ 145.9 $ 139.8

Long-Term Debt

Long-Term Debt	3 Months Ended
Long-Term Debt	Mar. 31, 2024
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: (Millions of dollars) March 31, December 31, 5.625% senior notes due 2027 (net of unamortized discount of $1.2 at March 31, 2024 and $1.3 at December 31, 2023) $ 298.8 $ 298.7 4.75% senior notes due 2029 (net of unamortized discount of $3.4 at March 31, 2024 and $3.6 at December 31, 2023) 496.6 496.4 3.75% senior notes due 2031 (net of unamortized discount of $4.3 at March 31, 2024 and $4.4 at December 31, 2023) 495.7 495.6 Term loan due 2028 (effective interest rate of 7.21% at March 31, 2024 and 7.23% at December 31, 2023 and net of unamortized discount of $0.5 at March 31, 2024 and $0.6 at December 31, 2023) 388.5 389.4 Capitalized lease obligations, autos and equipment, due through 2026 3.7 3.1 Capitalized lease obligations, buildings, due through 2059 121.8 123.6 Unamortized debt issuance costs (6.7) (7.1) Total long-term debt 1,798.4 1,799.7 Less current maturities 15.3 15.0 Total long-term debt, net of current $ 1,783.1 $ 1,784.7 Senior Notes On April 25, 2017, Murphy Oil USA, Inc. ("MOUSA"), our primary operating subsidiary, issued $300 million of 5.625% Senior Notes due 2027 (the "2027 Senior Notes") under its existing shelf registration statement. The 2027 Senior Notes are fully and unconditionally guaranteed by the Company and by the Company's subsidiaries that guarantee our Credit Facilities (as defined below). The indenture governing the 2027 Senior Notes contains restrictive covenants that limit, among other things, the ability of the Company, MOUSA, and the restricted subsidiaries to incur additional indebtedness or liens, dispose of assets, make certain restricted payments or investments, enter into transactions with affiliates or merge with or into other entities. On September 13, 2019, MOUSA, issued $500 million of 4.75% Senior Notes due 2029 (the “2029 Senior Notes”). The net proceeds from the issuance of the 2029 Senior Notes were used to fund, in part, the tender offer and redemption of a prior note issuance. The 2029 Senior Notes are fully and unconditionally guaranteed by the Company and by the Company's subsidiaries that guarantee our Credit Facilities. The indenture governing the 2029 Senior Notes contains restrictive covenants that are essentially identical to the covenants for the 2027 Senior Notes. On January 29, 2021, MOUSA, issued $500 million of 3.75% Senior Notes due 2031 (the "2031 Senior Notes" and, together with the 2027 Senior Notes and the 2029 Senior Notes, the "Senior Notes"). The net proceeds from the issuance of the 2031 Senior Notes were used, in part, to fund the acquisition of QuickChek and other obligations related to that transaction. The 2031 Senior Notes are fully and unconditionally guaranteed by the Company and by the Company's subsidiaries that guarantee our Credit Facilities. The indenture governing the 2031 Senior Notes contains restrictive covenants that are essentially identical to the covenants for the 2027 and 2029 Senior Notes. The Senior Notes and related guarantees rank equally with all of our and the guarantors’ existing and future senior unsecured indebtedness and effectively junior to our and the guarantors’ existing and future secured indebtedness (including indebtedness with respect to the Credit Facilities) to the extent of the value of the assets securing such indebtedness. The Senior Notes are structurally subordinated to all of the existing and future third-party liabilities, including trade payables, of our existing and future subsidiaries that do not guarantee the notes. Revolving Credit Facility and Term Loan Our credit agreement consists of both a cash flow revolving credit facility and a senior secured term loan. The credit agreement provides for a senior secured term loan in an aggregate principal amount of $400 million (the "Term Facility") (which was borrowed in full on January 29, 2021) and revolving credit commitments in an aggregate amount equal to $350 million (the "Revolving Facility", and together with the Term Facility, the "Credit Facilities"). The outstanding balance of the term loan was $389 million at March 31, 2024 and $390 million at December 31, 2023. The term loan is due January 2028, and we are required to make quarterly principal payments of $1 million, which began on July 1, 2021. As of March 31, 2024, we had no outstanding borrowings under the Revolving Facility and had $6.2 million in outstanding letters of credit (which reduces the amount available to borrow under the Revolving Facility). Interest payable on the Term Facility is based on either: • the term overnight financing rate, plus the applicable Alternative Reference Rate Committee ("ARRC") recommended credit spread adjustment (the “Adjusted Term SOFR Rate”); or • the Alternate Base Rate, which is defined as the highest of (a) the rate of interest last quoted by The Wall Street Journal as the "Prime Rate", (b) the greater of the federal funds effective rate and the overnight bank funding rate determined by the Federal Reserve Bank of New York from time to time plus 0.50% per annum and (c) the one-month Adjusted Term SOFR Rate plus 1.00% per annum, plus, (A) in the case of Adjusted Term SOFR Rate borrowings, a spread of 1.75% per annum and (B) in the case of Alternate Base Rate borrowings, a spread of 0.75% per annum. Interest payable on the Revolving Facility is based on either: • the term secured overnight financing rate, plus 0.10% credit spread adjustment for all interest periods (the "Adjusted SOFR Rate"), which is subject to a 0.0% floor; or • the Alternate Base Rate, which is defined as the highest of (a) the rate of interest last quoted by The Wall Street Journal as the "Prime Rate", (b) the greater of the federal funds effective rate and the overnight bank funding rate determined by the Federal Reserve Bank of New York from time to time plus 0.50% per annum and (c) the one-month Adjusted SOFR Rate plus 1.00% per annum, plus, (A) in the case of Adjusted SOFR Rate borrowings, a spread of 1.75% to 2.25% per annum depending on a total debt to EBITDA ratio and (B) in the case of Alternate Base Rate borrowings, spreads ranging from 0.75% to 1.25% per annum depending on a total debt to EBITDA ratio. The Term Facility amortizes in quarterly installments, which commenced on July 1, 2021, at a rate of 1.00% per annum. Murphy USA is also required to prepay the Term Facility with a portion of its excess cash flow, a portion of the net cash proceeds of certain asset sales and casualty events (subject to certain reinvestment rights) and the net cash proceeds of issuances of indebtedness not permitted under the Credit Agreement. The credit agreement allows Murphy USA to prepay, in whole or in part, the Term Facility outstanding thereunder, together with any accrued and unpaid interest, with prior notice but without premium or penalty other than breakage and redeployment costs. The credit agreement contains certain covenants that limit, among other things, the ability of the Company and certain of its subsidiaries to incur additional indebtedness or liens, to make certain investments, to enter into sale-leaseback transactions, to make certain restricted payments, to enter into consolidations, mergers or sales of material assets and other fundamental changes, to transact with affiliates, to enter into agreements restricting the ability of subsidiaries to incur liens or pay dividends, or to make certain accounting changes. The Revolving Facility credit agreement also impose total leverage ratio and secured net leverage ratio financial maintenance covenants which are tested quarterly. Pursuant to the total leverage ratio financial maintenance covenant, the Company must maintain a total leverage ratio of not more than 5.0 to 1.0 with an ability in certain circumstances to temporarily increase that limit to 5.5 to 1.0 and a maximum secured net leverage ratio of not more than 3.75 to 1.0 with an ability in certain circumstances to temporarily increase that limit to 4.25 to 1.0. The Credit Agreement also contains customary events of default. Pursuant to the credit agreement's covenant limiting certain restricted payments, certain payments in respect of our equity interests, including dividends, when the total leverage ratio, calculated on a pro forma basis, is greater than 3.0 to 1.0 could be limited. At March 31, 2024, our total leverage ratio was 1.76 to 1.0 which meant our ability at that date to make restricted payments was not limited. If our total leverage ratio, on a pro forma basis, exceeds 3.0 to 1.0, any restricted payments made following that time until the ratio is once again, on a pro forma basis, below 3.0 to 1.0 would be limited by the covenant, which contains certain exceptions, including an ability to make restricted payments in cash in an aggregate amount not to exceed the greater of $113.6 million or 4.50% of consolidated net tangible assets over the life of the credit agreement. All obligations under the credit agreement are guaranteed by Murphy USA and the subsidiary guarantors party thereto, and all obligations under the credit agreement, including the guarantees of those obligations, are secured by certain assets of Murphy USA, Murphy Oil USA, Inc. and the guarantors party to the guarantee and collateral agreement in respect thereof.

Asset Retirement Obligations (A

Asset Retirement Obligations (ARO)	3 Months Ended
Asset Retirement Obligations (ARO)	Mar. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations (ARO)	Asset Retirement Obligations (ARO) The majority of the ARO recognized by the Company at March 31, 2024 and December 31, 2023 is related to the estimated costs to dismantle and abandon certain of its retail gasoline stores. The Company has not recorded an ARO for certain of its marketing assets because sufficient information is presently not available to estimate a range of potential settlement dates for the obligation. These assets are consistently being upgraded and are expected to be operational into the foreseeable future. In these cases, the obligation will be initially recognized in the period in which sufficient information exists to estimate the obligation. A reconciliation of the beginning and ending aggregate carrying amount of the ARO is shown in the following table. (Millions of dollars) March 31, December 31, Balance at beginning of period $ 46.1 $ 43.3 Accretion expense 0.8 3.0 Settlements of liabilities (1.3) (3.1) Liabilities incurred 0.2 2.9 Balance at end of period $ 45.8 $ 46.1 The estimation of future ARO is based on a number of assumptions requiring professional judgment. The Company cannot predict the type of revisions to these assumptions that may be required in future periods due to the lack of availability of additional information.

Income Taxes

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate is calculated as the amount of income tax expense (benefit) divided by income before income tax expense (benefit). For the three months ended March 31, 2024 and 2023, the Company’s approximate effective tax rates were as follows: 2024 2023 Three Months Ended March 31, 19.4% 23.5% In the three months ended March 31, 2024, the Company recognized approximately $4.2 million of excess tax benefits related to stock compensation for employees and $0.1 million in other discrete tax benefits. For the three months ended March 31, 2023, the Company recognized approximately $2.1 million of excess tax benefits related to stock compensation for employees and $0.2 million in other discrete tax benefits. As of March 31, 2024, the earliest year remaining open for Federal audits and/or settlement is 2020 and for state audits and/or settlement is 2019. Although the Company believes that recorded liabilities for unsettled issues are adequate, additional gains or losses could occur in future periods from resolution of outstanding unsettled matters.

Incentive Plans

Incentive Plans	3 Months Ended
Incentive Plans	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Incentive Plans	Incentive Plans Equity Awards The MUSA 2013 Plan authorized the Executive Compensation Committee of our Board of Directors (“the Committee”) to grant non-qualified or incentive stock options, stock appreciation rights, stock awards (including restricted stock and restricted stock unit awards), dividend equivalent units, cash awards, and performance awards to our employees. No more than 5.5 million shares of MUSA common stock may be delivered under the MUSA 2013 Plan and no more than 1 million shares of common stock may be awarded to any one employee, subject to adjustment for changes in capitalization. The maximum cash amount payable pursuant to any “performance-based” award to any participant in any calendar year is $5.0 million. On May 4, 2023, the 2023 Omnibus Incentive Compensation Plan (the "MUSA 2023 Plan") was approved by the Company's shareholders and became effective for all future grants for both employees and directors. The MUSA 2023 Plan replaced the MUSA 2013 Plan and the 2013 Directors Plan, each of which expired on August 8, 2023. The MUSA 2023 Plan authorizes the Executive Compensation Committee of our Board of Directors (“the Committee”) to grant to non-employee directors, employees, and consultants of the Company, or any of its subsidiaries, stock options (incentive stock options ("ISOs") and nonqualified stock options ("NQSO")), stock appreciation rights ("SARs"), restricted stock, restricted stock units ("RSUs"), performance awards or other cash-based awards and other stock-based awards. The maximum number of shares available for issuance under the MUSA 2023 Plan shall not exceed in the aggregate 1.725 million shares (subject to certain adjustments). Beginning with its initial quarterly dividend in December 2020, the Company issued dividend equivalent units ("DEUs") on all outstanding, unvested equity awards (except stock options) in an amount commensurate with regular quarterly dividends paid on common stock. The terms of the DEUs mirror the underlying awards and will only vest if the related award vests. DEUs issued are included with grants in each respective table as applicable. STOCK OPTIONS – The Committee fixes the option price of each option granted at no less than fair market value ("FMV") on the date of the grant and fixes the option term at no more than 7 years from such date. Most of the nonqualified stock options granted in 2024 to certain employees by the Committee were granted in February 2024. The Black-Scholes valuation for these awards was $133.91 per option. Assumptions used to value awards: Dividend yield 0.42 % Expected volatility 32.9 % Risk-free interest rate 4.3 % Expected life (years) 4.8 Stock price at valuation date $ 391.54 Changes in options outstanding for Company employees during the period from December 31, 2023 to March 31, 2024 are presented in the following table: Options Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (Millions of Dollars) Outstanding at December 31, 2023 291,050 $ 139.07 Granted 33,010 $ 393.03 Exercised (19,100) $ 92.53 Outstanding at March 31, 2024 304,960 $ 169.48 4.1 $ 76.2 Exercisable at March 31, 2024 205,825 $ 114.62 3.2 $ 62.7 RESTRICTED STOCK UNITS – The Committee has granted time-based restricted stock units ("RSUs") as part of the compensation plan for its executives and certain other employees since its inception. The awards granted in the current year were under the MUSA 2023 Plan, are valued at the grant date fair value, and vest over three years. The Committee has also granted time based RSUs to the non-employee directors of the Company as part of their overall compensation package for being a member of the Board of Directors, these awards vest at the end of one year. For annual equity grants to non-employee directors, the directors may elect to defer receipt of their vested RSUs until their service ends. These RSUs are included in the RSU table below, will vest in one year, and will thereafter become deferred stock units. Changes in RSUs outstanding during the period from December 31, 2023 to March 31, 2024 are presented in the following table: RSUs Number of units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at December 31, 2023 120,800 $ 188.37 Granted 15,345 $ 392.96 Vested and issued (47,305) $ 133.44 $ 19.2 Forfeited (1,349) $ 221.17 Outstanding at March 31, 2024 87,491 $ 253.19 $ 36.7 DIRECTOR DEFERRED STOCK UNITS (MUSA 2023 Plan) — Non-employee directors can elect to receive their annual cash retainers in the form of DSUs. The DSUs are recognized at their fair value on the date of the grant. Director fees which are deferred into DSUs are calculated and expensed each quarter by taking fees earned during the quarter and dividing by the closing price of our common stock on the last trading day of the quarter. Each DSU represents the right to receive one share of common stock following the completion of a director's service. During the period ended March 31, 2024, we granted 206 DSUs and recorded director expense of $0.1 million related to the grants. At March 31, 2024, there were 1,209 Director DSUs vested and outstanding with an average grant date fair value of $349.46 under the MUSA 2023 Plan. PERFORMANCE-BASED RESTRICTED STOCK UNITS – The Committee has granted performance-based restricted stock units (performance units or "PSUs") to its executives and certain other employees. In February 2024, the Committee awarded PSUs to certain employees. Half of the PSUs vest based on a three-year return on average capital employed ("ROACE") calculation and the other half vest based on a three-year total shareholder return ("TSR") calculation that compares MUSA to a group of 17 peer companies. The portion of the awards that vest based on TSR qualify as a market condition and must be valued using a Monte Carlo valuation model. For the TSR portion of the awards, the fair value was determined to be $569.58 per unit. For the ROACE portion of the awards, the valuation was based on the grant date fair value of $391.54 per unit and the number of awards will be periodically assessed to determine the probability of vesting. Changes in PSUs outstanding for Company employees during the period from December 31, 2023 to March 31, 2024 are presented in the following table: Employee PSUs Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at December 31, 2023 95,582 $ 212.38 Granted 60,431 $ 482.74 Vested and issued (76,672) $ 148.38 $ 30.0 Outstanding at March 31, 2024 79,341 $ 318.45 $ 33.3 2013 Stock Plan for Non-employee Directors Effective August 8, 2013, Murphy USA adopted the 2013 Murphy USA Stock Plan for Non-employee Directors (the “2013 Directors Plan”). The directors for Murphy USA are compensated with a mixture of cash payments and equity-based awards. Awards under the 2013 Directors Plan may be in the form of restricted stock, restricted stock units, dividend equivalent units, stock options, or a combination thereof. An aggregate of 0.5 million shares of common stock was reserved for issuance of grants under the Directors Plan. RESTRICTED STOCK UNITS (2013 Directors Plan) – The Committee has also granted time based RSUs to the non-employee directors of the Company as part of their overall compensation package for being a member of the Board of Directors. Awards prior to 2023 vest at the end of three years and those granted in 2023 vested at the end of one year. Changes in Director RSUs outstanding for Company non-employee directors during the period from December 31, 2023 to March 31, 2024 are presented in the following table: 2013 Plan — Director RSUs Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at December 31, 2023 23,654 $ 180.97 Granted 10 $ 411.81 Vested and issued (13,461) $ 170.52 $ 5.3 Outstanding at March 31, 2024 10,203 $ 194.78 $ 4.3 DEFERRED STOCK UNITS (2013 Directors Plan) — Effective January 1, 2023, non-employee directors could elect to receive their annual cash retainers in the form of Deferred Stock Units ("DSUs"). Each DSU represents the right to receive one share of common stock following the completion of a director's service. Two DEU shares were granted and vested on the DSUs during the quarter. At March 31, 2024 there were 425 Director DSUs outstanding with an average grant date fair value of $258.35 under the 2013 Plan.

Financial Instruments and Risk

Financial Instruments and Risk Management	3 Months Ended
Financial Instruments and Risk Management	Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments and Risk Management	Financial Instruments and Risk Management DERIVATIVE INSTRUMENTS — The Company makes limited use of derivative instruments to manage certain risks related to commodity prices and interest rates. The use of derivative instruments for risk management is covered by operating policies and is closely monitored by the Company’s senior management. The Company does not hold any derivatives for speculative purposes, and it does not use derivatives with leveraged or complex features. Derivative instruments are traded primarily with credit worthy major financial institutions or over national exchanges such as the New York Mercantile Exchange (“NYMEX”). For accounting purposes, the Company has not designated commodity derivative contracts as hedges, and therefore, it recognizes all gains and losses on these derivative contracts in its Consolidated Statements of Income. Certain interest rate derivative contracts were accounted for as hedges and gain or loss associated with recording the fair value of these contracts was deferred in AOCI until the anticipated transactions occurred. As of March 31, 2024, all current commodity derivative activity is immaterial. There were $0.1 million in cash deposits at March 31, 2024 and $1.0 million at December 31, 2023 related to commodity derivative contracts reported in Prepaid expenses and other current assets in the Consolidated Balance Sheets. These cash deposits have not been used to increase the reported net assets or reduce the reported net liabilities on the derivative contracts at March 31, 2024 or December 31, 2023. Interest Rate Risks

Earnings Per Share

Earnings Per Share	3 Months Ended
Earnings Per Share	Mar. 31, 2024
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted average of common shares outstanding during the period. Diluted earnings per common share adjusts basic earnings per common share for the effects of stock options and restricted stock in the periods where such items are dilutive. On May 2, 2023, our Board of Directors approved a share repurchase authorization of up to $1.5 billion that expires December 31, 2028, and excludes excise tax. As of March 31, 2024, approximately $1.3 billion remained under the 2023 authorization. For the three months ended March 31, 2024, the Company repurchased 216,036 shares of common stock for an average price of $402.14 per share including brokerage fees and excise tax. For the three months ended March 31, 2023, 48,848 shares were repurchased for an average price of $279.67 per share and were under the 2021 repurchase authorization. The following tables provide a reconciliation of basic and diluted earnings per share computations for the three months ended March 31, 2024 and 2023: Three Months Ended (Millions of dollars, except share and per share amounts) 2024 2023 Earnings per common share: Net income per share - basic Net income attributable to common stockholders $ 66.0 $ 106.3 Weighted average common shares outstanding (in thousands) 20,814 21,739 Earnings per common share $ 3.17 $ 4.89 Three Months Ended (Millions of dollars, except share and per share amounts) 2024 2023 Earnings per common share - assuming dilution: Net income per share - diluted Net income attributable to common stockholders $ 66.0 $ 106.3 Weighted average common shares outstanding (in thousands) 20,814 21,739 Common equivalent shares: Dilutive share-based awards 348 394 Weighted average common shares outstanding - assuming dilution 21,162 22,133 Earnings per common share assuming dilution $ 3.12 $ 4.80 We have excluded from the earnings-per-share calculation certain stock options and shares that are considered to be anti-dilutive under the treasury stock method and are reported in the table below. Three Months Ended Potentially dilutive shares excluded from the calculation as their inclusion would be anti-dilutive 2024 2023 Stock Options 16,597 38,100 RSUs 151 — PSUs 5,689 12,767 Total anti-dilutive shares 22,437 50,867

Other Financial Information

Other Financial Information	3 Months Ended
Other Financial Information	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Financial Information	Other Financial Information CASH FLOW DISCLOSURES — Cash income taxes received were $0.1 million and $0.3 million for the three-month periods ended March 31, 2024 and 2023, respectively. Interest paid, net of amounts capitalized, was $30.4 million and $29.2 million for the three-month periods ended March 31, 2024 and 2023, respectively. CHANGES IN WORKING CAPITAL: Three Months Ended (Millions of dollars) 2024 2023 Accounts receivable $ (45.7) $ 16.5 Inventories 48.6 15.5 Prepaid expenses and other current assets (5.7) 20.4 Accounts payable and accrued liabilities (9.3) (85.9) Income taxes payable 16.3 3.1 Net (increase) decrease in noncash operating working capital $ 4.2 $ (30.4)

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value	3 Months Ended
Assets and Liabilities Measured at Fair Value	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value	Assets and Liabilities Measured at Fair Value The Company carries certain assets and liabilities at fair value in its Consolidated Balance Sheets. The fair value hierarchy is based on the quality of inputs used to measure fair value, with Level 1 being the highest quality and Level 3 being the lowest quality. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included within Level 1. Level 3 inputs are unobservable inputs which reflect assumptions about pricing by market participants. The Company's available-for-sale marketable securities consist of high quality, investment grade securities from diverse issuers. We value these securities at the closing price in the principal active markets as of the last business day of the reporting period. The fair values of the Company's marketable securities by asset class are described in Note 4 "Marketable Securities" in these consolidated financial statements for the period ended March 31, 2024. We value the deferred compensation plan assets, which consist of money market and mutual funds, based on quoted prices in active markets at the measurement date. For additional information on deferred compensation plans see also Note 13 "Employee and Retirement Benefit Plans" in the audited consolidated financial statements for the year ended December 31, 2023 included in our Annual Report on Form 10-K for more information. At the balance sheet date, the fair value of commodity derivatives contracts was determined using NYMEX quoted values and the value of the Interest rate swap derivative was derived by using level 3 inputs. The carrying value of the Company’s Cash and cash equivalents, Accounts receivable-trade, Trade accounts payable, and accrued liabilities approximates fair value. See also Note 10 "Financial Instruments and Risk Management" in these consolidated financial statements for the period ended March 31, 2024, for more information. Financial assets and liabilities measured at fair value on a recurring basis The following tables present the Company's financial assets and liabilities measured at fair value on a recurring basis, as of March 31, 2024 and December 31, 2023: March 31, 2024 (Millions of dollars) Level 1 Level 2 Level 3 Fair Value Financial assets Marketable securities, current U.S. Government bonds $ — $ 3.0 $ — $ 3.0 U.S. Corporate bonds — 3.1 — 3.1 Prepaid expenses and other current assets: Fuel derivative — — 0.6 0.6 Marketable securities, non-current U.S. Corporate bonds — 3.0 — 3.0 Non U.S. Corporate bonds — 1.5 — 1.5 Other assets Deferred compensation plan assets 13.9 — — 13.9 Financial liabilities Deferred credits and other liabilities Deferred compensation plan liabilities (23.0) — — (23.0) $ (9.1) $ 10.6 $ 0.6 $ 2.1 December 31, 2023 (Millions of dollars) Level 1 Level 2 Level 3 Fair Value Financial assets Marketable securities, current U.S. Government bonds $ — $ 3.0 $ — $ 3.0 U.S. Corporate bonds — 4.1 — 4.1 Prepaid expenses and other current assets: Fuel derivative — — 0.6 0.6 Marketable securities, non-current U.S. Corporate bonds — 2.9 — 2.9 Non U.S. Government bonds — 1.5 — 1.5 Other assets Deferred compensation plan assets 12.5 — — 12.5 Financial liabilities Deferred credits and other liabilities Deferred compensation plan liabilities (20.2) — — (20.2) $ (7.7) $ 11.5 $ 0.6 $ 4.4 Fair value of financial instruments not recognized at fair value The fair value of a financial instrument is the amount at which the instrument could be exchanged in a current transaction between willing parties. The table below excludes Cash and cash equivalents, Accounts receivable-trade, and Trade accounts payable and accrued liabilities, all of which had fair values approximating carrying amounts. The fair value of Current and Long-term debt was estimated based on rates offered to the Company at that time for debt of the same maturities. The Company has off-balance sheet exposures relating to certain financial guarantees and letters of credit. The fair value of these, which represents fees associated with obtaining the instruments, was nominal. The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at March 31, 2024 and December 31, 2023. At March 31, 2024 At December 31, 2023 Carrying Carrying (Millions of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt, excluding finance leases $ (1,672.9) $ (1,663.6) $ (1,673.0) $ (1,662.9)

Contingencies

Contingencies	3 Months Ended
Contingencies	Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies The Company’s operations and earnings have been and may be affected by various forms of governmental action. Examples of such governmental action include, but are by no means limited to: tax increases and retroactive tax claims; import and export controls; price controls; allocation of supplies of crude oil and petroleum products and other goods; laws and regulations intended for the promotion of safety and the protection and/or remediation of the environment; governmental support for other forms of energy; and laws and regulations affecting the Company’s relationships with employees, suppliers, customers, stockholders and others. Because governmental actions are often motivated by political considerations, may be taken without full consideration of their consequences, and may be taken in response to actions of other governments, it is not practical to attempt to predict the likelihood of such actions, the form the actions may take or the effect such actions may have on the Company. ENVIRONMENTAL MATTERS AND LEGAL MATTERS — Murphy USA is subject to numerous federal, state and local laws and regulations dealing with the environment. Violation of such environmental laws, regulations and permits can result in the imposition of significant civil and criminal penalties, injunctions and other sanctions. A discharge of hazardous substances into the environment could, to the extent such event is not insured, subject the Company to substantial expense, including both the cost to comply with applicable regulations and claims by neighboring landowners and other third parties for any personal injury, property damage and other losses that might result. The Company currently owns or leases, and has in the past owned or leased, properties at which hazardous substances have been or are being handled. Although the Company believes it has used operating and disposal practices that were standard in the industry at the time, hazardous substances may have been disposed of or released on or under the properties owned or leased by the Company or on or under other locations where they have been taken for disposal. In addition, many of these properties have been operated by third parties whose management of hazardous substances was not under the Company’s control. Under existing laws, the Company could be required to remediate contaminated property (including contaminated groundwater) or to perform remedial actions to prevent future contamination. Certain of these contaminated properties are in various stages of negotiation, investigation, and/or cleanup, and the Company is investigating the extent of any related liability and the availability of applicable defenses. With the sale of the U.S. refineries in 2011, Murphy Oil retained certain liabilities related to environmental matters. Murphy Oil also obtained insurance covering certain levels of environmental exposures. With respect to the previously owned refinery properties, Murphy Oil retained those liabilities in the Separation and Distribution agreement that was entered into related to the separation on August 30, 2013. With respect to any remaining potential liabilities, based on information currently available to the Company, the Company believes costs related to these properties will not have a material adverse effect on Murphy USA’s net income, financial condition or liquidity in a future period. While it is possible that certain environmental expenditures could be recovered by the Company from other sources, primarily environmental funds maintained by certain states, no assurance can be given that future recoveries from other sources will occur. As such, the Company has not recorded a benefit for likely recoveries at March 31, 2024, however certain jurisdictions provide reimbursement for these expenses which have been considered in recording the net exposure. The U.S. Environmental Protection Agency (EPA) currently considers the Company a Potentially Responsible Party (PRP) at one Superfund site. As to the site, the potential total cost to all parties to perform necessary remedial work at this site may be substantial. However, based on current negotiations and available information, the Company believes that it is a de minimis party as to ultimate responsibility at the Superfund site. Accordingly, the Company has not recorded a liability for remedial costs at the Superfund site at March 31, 2024. The Company could be required to bear a pro rata share of costs attributable to nonparticipating PRPs or could be assigned additional responsibility for remediation at this site or other Superfund sites. Based on information currently available to the Company, the Company believes that its share of the ultimate costs to clean up this site will be immaterial and will not have a material adverse effect on its net income, financial condition or liquidity in a future period. Based on information currently available to the Company, the amount of future remediation costs to be incurred to address known contamination sites is not expected to have a material adverse effect on the Company’s future net income, cash flows or liquidity. However, there is the possibility that additional environmental expenditures could be required to address contamination, including as a result of discovering additional contamination or the imposition of new or revised requirements applicable to known contamination. Murphy USA is engaged in a number of other legal proceedings, all of which the Company considers routine and incidental to its business. Currently, the City of Charleston, South Carolina, and the State of Delaware have filed lawsuits against energy companies, including the Company. These lawsuits allege damages as a result of climate change and the plaintiffs are seeking unspecified damages and abatement under various tort theories. At this early stage, the ultimate outcome of these matters remain uncertain, and neither the likelihood of an unfavorable outcome nor the ultimate liability, if any, can be determined. Based on information currently available to the Company, the ultimate resolution of these other legal matters is not expected to have a material adverse effect on the Company’s net income, financial condition or liquidity in a future period. INSURANCE — The Company maintains insurance coverage at levels that are customary and consistent with industry standards for companies of similar size. Murphy USA maintains statutory workers compensation insurance with a deductible of $1.0 million per occurrence, general liability insurance with a self-insured retention of $3.0 million per occurrence, and auto liability insurance with a deductible of $0.3 million per occurrence. As of March 31, 2024, there were a number of outstanding claims that are of a routine nature. The estimated incurred but unpaid liabilities relating to these claims are included in Trade account payables and accrued liabilities on the Consolidated Balance Sheets. While the ultimate outcome of these claims cannot presently be determined, management believes that the accrued liability of $47.9 million will be sufficient to cover the related liability for all insurance claims and that the ultimate disposition of these claims will have no material effect on the Company’s financial position and results of operations. The Company has obtained insurance coverage as appropriate for the business in which it is engaged but may incur losses that are not covered by insurance or reserves, in whole or in part, and such losses could adversely affect our results of operations and financial position. TAX MATTERS — Murphy USA is subject to extensive tax liabilities imposed by multiple jurisdictions, including income taxes, indirect taxes (excise/duty, sales/use and gross receipts taxes), payroll taxes, franchise taxes, withholding taxes and ad valorem taxes. New tax laws and regulations and changes in existing tax laws and regulations are continuously being enacted or proposed that could result in increased expenditures for tax liabilities in the future. Many of these liabilities are subject to periodic audits by the respective taxing authority. Subsequent changes to our tax liabilities because of these audits may subject us to interest and penalties. OTHER MATTERS — In the normal course of its business, the Company is required under certain contracts with various governmental authorities and others to provide financial guarantees or letters of credit that may be drawn upon if the Company fails to perform under those contracts. At March 31, 2024, the Company had contingent liabilities of $10.2 million on outstanding letters of credit. The Company has not accrued a liability in its balance sheet related to these financial guarantees and letters of credit because it is believed that the likelihood of having these drawn is remote.

Lease Accounting

Lease Accounting	3 Months Ended
Lease Accounting	Mar. 31, 2024
Leases [Abstract]
Lease Accounting	Lease Accounting The Company determines if an arrangement is a lease or contains a lease at inception. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. The Company's leases have remaining lease terms of 2 year or less to 36 years, which may include the option to extend the lease when it is reasonably certain the Company will exercise the option. Most leases include one or more options to renew, with renewal terms that can extend the lease term from 5 to 20 years or more. The exercise of lease renewal options is at the Company's sole discretion. Due to the uncertainties of future markets, economic factors, technology changes, demographic shifts and behavior, environmental regulatory requirements and other information that impacts decisions as to store location, management has determined that it was not reasonably certain to exercise contract options and they are not included in the lease term. Additionally, short-term leases and leases with variable lease costs are immaterial. The Company reviews all options to extend, terminate, or otherwise modify its lease agreements to determine if changes are required to the right-of-use assets and liabilities. As the implicit interest rate is not readily determinable in most of the Company's lease agreements, the Company uses its estimated secured incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Lessor — We have various arrangements for certain spaces for food service and vending equipment as well as subleases under which we are the lessor. These leases meet the criteria for operating lease classification. Lease income associated with these leases is immaterial. Lessee — We lease land for 451 stores and store sites, one terminal, a hangar and various equipment. Our lease agreements do not contain any material residual value guarantees. Included in our leased land are 102 properties leased from Walmart which contain restrictive covenants, though the restrictions are deemed to have an immaterial impact. Leases are reflected in the following balance sheet accounts: (Millions of dollars) Classification March 31, December 31, Assets Operating (Right-of-use) Operating lease right-of-use assets, net $ 452.8 $ 452.1 Finance Property, plant, and equipment, at cost, less accumulated depreciation 111.9 113.8 Total leased assets $ 564.7 $ 565.9 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 22.2 $ 22.1 Finance Current maturities of long-term debt 11.3 11.0 Noncurrent Operating Non-current operating lease liabilities 452.1 450.3 Finance Long-term debt, including capitalized lease obligations 114.2 115.7 Total lease liabilities $ 599.8 $ 599.1 Lease Cost: Three Months Ended (Millions of dollars) Classification 2024 2023 Operating lease cost Store and other operating expenses $ 14.1 $ 13.4 Finance lease cost Amortization of leased assets Depreciation and amortization 3.7 3.8 Interest on lease liabilities Interest expense 2.1 2.4 Net lease costs $ 19.9 $ 19.6 Cash Flow Information: Three Months Ended (Millions of dollars) 2024 2023 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 13.1 $ 12.3 Operating cash flows from finance leases $ 2.1 $ 2.4 Financing cash flows from finance leases $ 2.9 $ 2.8 Maturity of Lease Liabilities at March 31, 2024: (Millions of dollars) Operating leases Finance leases 2024 $ 40.1 $ 14.6 2025 53.2 18.5 2026 52.5 17.4 2027 51.7 16.3 2028 51.2 15.6 After 2028 550.0 106.9 Total lease payments 798.7 189.3 less: interest 324.4 63.8 Present value of lease liabilities $ 474.3 $ 125.5 Lease Term and Discount Rate: Three Months Ended March 31, 2024 Weighted average remaining lease term (years) Finance leases 12.0 Operating leases 15.0 Weighted average discount rate Finance leases 6.8 % Operating leases 6.6 %
Lease Accounting	Lease Accounting The Company determines if an arrangement is a lease or contains a lease at inception. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. The Company's leases have remaining lease terms of 2 year or less to 36 years, which may include the option to extend the lease when it is reasonably certain the Company will exercise the option. Most leases include one or more options to renew, with renewal terms that can extend the lease term from 5 to 20 years or more. The exercise of lease renewal options is at the Company's sole discretion. Due to the uncertainties of future markets, economic factors, technology changes, demographic shifts and behavior, environmental regulatory requirements and other information that impacts decisions as to store location, management has determined that it was not reasonably certain to exercise contract options and they are not included in the lease term. Additionally, short-term leases and leases with variable lease costs are immaterial. The Company reviews all options to extend, terminate, or otherwise modify its lease agreements to determine if changes are required to the right-of-use assets and liabilities. As the implicit interest rate is not readily determinable in most of the Company's lease agreements, the Company uses its estimated secured incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Lessor — We have various arrangements for certain spaces for food service and vending equipment as well as subleases under which we are the lessor. These leases meet the criteria for operating lease classification. Lease income associated with these leases is immaterial. Lessee — We lease land for 451 stores and store sites, one terminal, a hangar and various equipment. Our lease agreements do not contain any material residual value guarantees. Included in our leased land are 102 properties leased from Walmart which contain restrictive covenants, though the restrictions are deemed to have an immaterial impact. Leases are reflected in the following balance sheet accounts: (Millions of dollars) Classification March 31, December 31, Assets Operating (Right-of-use) Operating lease right-of-use assets, net $ 452.8 $ 452.1 Finance Property, plant, and equipment, at cost, less accumulated depreciation 111.9 113.8 Total leased assets $ 564.7 $ 565.9 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 22.2 $ 22.1 Finance Current maturities of long-term debt 11.3 11.0 Noncurrent Operating Non-current operating lease liabilities 452.1 450.3 Finance Long-term debt, including capitalized lease obligations 114.2 115.7 Total lease liabilities $ 599.8 $ 599.1 Lease Cost: Three Months Ended (Millions of dollars) Classification 2024 2023 Operating lease cost Store and other operating expenses $ 14.1 $ 13.4 Finance lease cost Amortization of leased assets Depreciation and amortization 3.7 3.8 Interest on lease liabilities Interest expense 2.1 2.4 Net lease costs $ 19.9 $ 19.6 Cash Flow Information: Three Months Ended (Millions of dollars) 2024 2023 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 13.1 $ 12.3 Operating cash flows from finance leases $ 2.1 $ 2.4 Financing cash flows from finance leases $ 2.9 $ 2.8 Maturity of Lease Liabilities at March 31, 2024: (Millions of dollars) Operating leases Finance leases 2024 $ 40.1 $ 14.6 2025 53.2 18.5 2026 52.5 17.4 2027 51.7 16.3 2028 51.2 15.6 After 2028 550.0 106.9 Total lease payments 798.7 189.3 less: interest 324.4 63.8 Present value of lease liabilities $ 474.3 $ 125.5 Lease Term and Discount Rate: Three Months Ended March 31, 2024 Weighted average remaining lease term (years) Finance leases 12.0 Operating leases 15.0 Weighted average discount rate Finance leases 6.8 % Operating leases 6.6 %

Business Segments

Business Segments	3 Months Ended
Business Segments	Mar. 31, 2024
Segment Reporting [Abstract]
Business Segments	Business Segments Our operations include the sale of retail motor fuel products and convenience merchandise along with the wholesale and bulk sale capabilities of our product supply and wholesale group. As the primary purpose of the product supply and wholesale group is to support our retail operations and provide fuel for their daily operation, the bulk and wholesale fuel sales are secondary to the support functions played by this group. As such, they are all treated as one segment for reporting purposes as they sell the same products and have similar economic characteristics. This Marketing segment contains essentially all of the revenue generating activities of the Company. Results not included in the reportable segment include Corporate and Other Assets. The reportable segment was determined based on information reviewed by the Chief Operating Decision Maker. Three Months Ended March 31, 2024 March 31, 2023 (Millions of dollars) Total Assets at March 31, 2024 External Revenues Income (Loss) External Revenues Income (Loss) Marketing $ 4,106.9 $ 4,843.6 $ 85.5 $ 5,077.1 $ 125.9 Corporate and other assets 200.1 0.1 (19.5) 0.1 (19.6) Total $ 4,307.0 $ 4,843.7 $ 66.0 $ 5,077.2 $ 106.3

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	In preparing the financial statements of Murphy USA in conformity with accounting principles generally accepted in the United States, management has made a number of estimates and assumptions related to the reporting of assets, liabilities, revenues, expenses and the disclosure of contingent assets and liabilities. Actual results may differ from these estimates.
Recently Issued Accounting Standards	Recently Issued Accounting Standards — In December 2023, the FASB issued ASU 2023-07, "Segment Reporting: Improvements to Reportable Segment Disclosures." The amendments in this Update improve financial reporting by requiring disclosure of incremental segment information on an annual and interim basis for all public entities and clarifies that single reportable segment entities must apply Topic 280 in its entirety. The amendments in this Update for annual disclosures were effective for the Company on January 1, 2024, and the interim disclosures will be effective for the year beginning January 1, 2025, with early adoption permitted. The amendments will be applied retrospectively to all prior periods presented in the financial statement. The Company has determined this will not have a material impact on the Company's consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, "Improvements to Income Tax Disclosures." This ASU intends to enhance income tax disclosures, under Topic 740, to address investor requests for more transparency about income tax information through improvements to income tax disclosures primarily related to the rate reconciliation and income taxes paid information. The amendments in this Update improve the transparency of income tax disclosures by requiring (1) consistent categories and greater disaggregation of information in the rate reconciliation and (2) income taxes paid disaggregated by jurisdiction. The amendments in this Update are effective for the Company for the year beginning January 1, 2025, with early adoption permitted. The
Revenue Recognition	Revenue Recognition Revenue is recognized when obligations under the terms of a contract with our customers are satisfied; generally, this occurs with the transfer of control of our petroleum products, convenience merchandise, Renewable Identification Numbers ("RINs") and other assets to our third-party customers. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. Excise and sales tax that we collect where we have determined we are the principal in the transaction have been recorded as revenue on a jurisdiction-by-jurisdiction basis. The Company enters into buy/sell and similar arrangements when petroleum products are held at one location but are needed at a different location. The Company often pays or receives funds related to the buy/sell arrangements based on location or quality differences. The Company accounts for such transactions as non-monetary exchanges under existing accounting guidance and typically reports these on a net basis in the Consolidated Statements of Income. Marketing segment Petroleum product sales (at retail). For our retail store locations, the revenue related to petroleum product sales is recognized as the fuel is pumped to our customers. The transaction price at the pump typically includes some portion of sales or excise taxes as levied in the respective jurisdictions. Those taxes that are collected for remittance to governmental entities on a pass-through basis are not recognized as revenue and they are recorded to a liability account until they are paid. Our customers typically use a mixture of cash, checks, credit cards and debit cards to pay for our products as they are received. We have accounts receivable from the various credit/debit card providers at any point in time related to product sales made on credit cards and debit cards. These receivables are typically collected in two Petroleum product sales (at wholesale). Our sales of petroleum products at wholesale are generally recorded as revenue when the deliveries have occurred and legal ownership of the product has transferred to the customer. Title transfer for bulk refined product sales typically occurs at pipeline custody points and upon trucks loading at product terminals. For bulk pipeline sales, we record receivables from customers that are generally collected within a week from custody transfer date. For our rack product sales, the majority of our customers' accounts are drafted by us within 10 days from product transfer. Merchandise sales. For our retail store locations, the revenue related to merchandise sales is recognized as the customer completes their purchase at our locations. The transaction price typically includes some portion of sales tax as levied in the respective jurisdictions. Those taxes that are collected for remittance to governmental entities on a pass-through basis are not recognized as revenue and they are recorded to a liability account until they are paid. As noted above, a mixture of payment types are used for these revenues and the same terms for credit/debit card receivables are realized. With respect to merchandise sales revenue we must determine whether we are the principal or agent for some categories of merchandise such as scratch-off lottery tickets, lotto tickets, newspapers and other small categories of merchandise. For scratch-off lottery tickets, we have determined we are the principal in the majority of the jurisdictions and therefore we record those sales on a gross basis. We have some categories of merchandise (such as lotto tickets) where we are the agent and the revenues recorded for those transactions are our net commission only. The Company offers loyalty programs through each of its branded retail locations. The customers earn rewards based on their spending or other promotional activities. These programs create a performance obligation which requires us to defer a portion of sales revenue to the loyalty program participants until they redeem their rewards. The rewards may be redeemed for free or discounted merchandise or cash discounts at all stores and on fuel purchases at Murphy branded stores. Earned rewards expire after an account is inactive for a period of 90 days at Murphy branded stores, while certain QuickChek rewards require use within the month. We recognize loyalty revenue when a customer redeems an earned reward. Deferred revenue associated with both rewards programs are included in Trade accounts payable and accrued liabilities in our Consolidated Balance Sheets. The deferred revenue balances at March 31, 2024 and December 31, 2023 were immaterial. RINs sales. For the sale of RINs, we recognize revenue when the RIN is transferred to the counter-party and the sale is completed. Receivables from our counter-parties related to the RIN sales are typically collected within five days of the sale. Other revenues. Items reported as other operating revenues include collection allowances for excise and sales tax and other miscellaneous items and are recognized as revenue when the transaction is completed.
Derivative Instruments	DERIVATIVE INSTRUMENTS — The Company makes limited use of derivative instruments to manage certain risks related to commodity prices and interest rates. The use of derivative instruments for risk management is covered by operating policies and is closely monitored by the Company’s senior management. The Company does not hold any derivatives for speculative purposes, and it does not use derivatives with leveraged or complex features. Derivative instruments are traded primarily with credit worthy major financial institutions or over national exchanges such as the New York Mercantile Exchange (“NYMEX”). For accounting purposes, the Company has not designated commodity derivative contracts as hedges, and therefore, it recognizes all gains and losses on these derivative contracts in its Consolidated Statements of Income. Certain interest rate derivative contracts were accounted for as hedges and gain or loss associated with recording the fair value of these contracts was deferred in AOCI until the anticipated transactions occurred.
Lease Accounting	The Company determines if an arrangement is a lease or contains a lease at inception. Operating lease right-of-use assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Leases with an initial term of 12 months or less are not recorded on the balance sheet; we recognize lease expense for these leases on a straight-line basis over the lease term. The Company's leases have remaining lease terms of 2 year or less to 36 years, which may include the option to extend the lease when it is reasonably certain the Company will exercise the option. Most leases include one or more options to renew, with renewal terms that can extend the lease term from 5 to 20 years or more. The exercise of lease renewal options is at the Company's sole discretion. Due to the uncertainties of future markets, economic factors, technology changes, demographic shifts and behavior, environmental regulatory requirements and other information that impacts decisions as to store location, management has determined that it was not reasonably certain to exercise contract options and they are not included in the lease term. Additionally, short-term leases and leases with variable lease costs are immaterial. The Company reviews all options to extend, terminate, or otherwise modify its lease agreements to determine if changes are required to the right-of-use assets and liabilities. As the implicit interest rate is not readily determinable in most of the Company's lease agreements, the Company uses its estimated secured incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. Lessor — We have various arrangements for certain spaces for food service and vending equipment as well as subleases under which we are the lessor. These leases meet the criteria for operating lease classification. Lease income associated with these leases is immaterial. Lessee

Revenues (Tables)

Revenues (Tables)	3 Months Ended
Revenues (Tables)	Mar. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	The following tables disaggregate our revenues by major source for the three months ended March 31, 2024 and 2023, respectively: Three Months Ended March 31, 2024 Three Months Ended March 31, 2023 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 3,427.6 — $ 3,427.6 $ 3,586.1 $ — $ 3,586.1 Petroleum product sales (at wholesale) 1 384.1 — 384.1 408.1 — 408.1 Total petroleum product sales 3,811.7 — 3,811.7 3,994.2 — 3,994.2 Merchandise sales 1,000.7 — 1,000.7 966.2 966.2 Other operating revenues: RINs 29.4 — 29.4 115.3 115.3 Other revenues 2 1.8 0.1 1.9 1.4 0.1 1.5 Total revenues $ 4,843.6 $ 0.1 $ 4,843.7 $ 5,077.1 $ 0.1 $ 5,077.2 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes combined with other miscellaneous items

Inventories (Tables)

Inventories (Tables)	3 Months Ended
Inventories (Tables)	Mar. 31, 2024
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories consisted of the following: (Millions of dollars) March 31, December 31, Petroleum products - FIFO basis $ 356.8 $ 331.2 Store merchandise for resale - FIFO basis 198.0 209.1 Less LIFO reserve (274.3) (212.1) Total petroleum products and store merchandise inventory 280.5 328.2 Materials and supplies 12.2 13.0 Total inventories $ 292.7 $ 341.2

Marketable Securities (Tables)

Marketable Securities (Tables)	3 Months Ended
Marketable Securities (Tables)	Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Carrying Values of Marketable Securities	The amortized cost and carrying value (fair value) of marketable securities and the balance sheet location at March 31, 2024 and December 31, 2023 consisted of the following: March 31, 2024 (Millions of dollars) Amortized Gross Gross Estimated Available-for-sale securities: Marketable securities current U.S. Government bonds $ 3.0 $ — — $ 3.0 U.S. Corporate bonds 3.0 — — 3.0 Investment income receivable 0.1 — — 0.1 6.1 — — 6.1 Marketable securities non-current U.S. Corporate bonds 3.0 — — 3.0 Non U.S. Corporate bonds 1.5 — — 1.5 4.5 — — 4.5 Total marketable securities $ 10.6 $ — $ — $ 10.6 December 31, 2023 (Millions of dollars) Amortized Gross Gross Estimated Available-for-sale securities: Marketable securities current U.S. Government bonds $ 3.0 $ — $ — $ 3.0 U.S. Corporate bonds 3.9 — — 3.9 Investment income receivable 0.2 — — 0.2 7.1 — — 7.1 Marketable securities non-current U.S. Corporate bonds 2.9 — — 2.9 Non U.S. Corporate bonds 1.5 — — 1.5 4.4 — — 4.4 Total marketable securities $ 11.5 $ — $ — $ 11.5
Schedule of Amortized Cost Basis and Fair Value of Available-for-Sale Marketable Securities Excluding Investment Income Receivable	The amortized cost basis and fair value of the Company's available-for-sale marketable securities, excluding Investment income receivable, at March 31, 2024, by contractual maturity, are as follows: (Millions of dollars ) Amortized Cost Fair Value Less than 1 year $ 10.5 $ 10.5

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
Goodwill and Intangible Assets (Tables)	Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	(Millions of dollars) March 31, December 31, Goodwill $ 328.0 $ 328.0
Schedule of Intangible Assets Subject to Amortization	Intangible assets subject to amortization at March 31, 2024 and December 31, 2023 consisted of the following: Remaining Useful Life (in years) March 31, 2024 December 31, 2023 (Millions of dollars) Cost Net Cost Net Intangible assets subject to amortization: Pipeline space 31.4 $ 39.6 $ 31.4 $ 39.6 $ 31.7 Intangible lease liability 10.2 (9.1) (7.1) (9.1) (7.3) Total intangible assets subject to amortization 30.5 24.3 30.5 24.4 Intangible assets not subject to amortization, indefinite lives: Trade name 115.4 115.4 115.4 115.4 Intangible assets, net of amortization $ 145.9 $ 139.7 $ 145.9 $ 139.8

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
Long-Term Debt (Tables)	Mar. 31, 2024
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	Long-term debt consisted of the following: (Millions of dollars) March 31, December 31, 5.625% senior notes due 2027 (net of unamortized discount of $1.2 at March 31, 2024 and $1.3 at December 31, 2023) $ 298.8 $ 298.7 4.75% senior notes due 2029 (net of unamortized discount of $3.4 at March 31, 2024 and $3.6 at December 31, 2023) 496.6 496.4 3.75% senior notes due 2031 (net of unamortized discount of $4.3 at March 31, 2024 and $4.4 at December 31, 2023) 495.7 495.6 Term loan due 2028 (effective interest rate of 7.21% at March 31, 2024 and 7.23% at December 31, 2023 and net of unamortized discount of $0.5 at March 31, 2024 and $0.6 at December 31, 2023) 388.5 389.4 Capitalized lease obligations, autos and equipment, due through 2026 3.7 3.1 Capitalized lease obligations, buildings, due through 2059 121.8 123.6 Unamortized debt issuance costs (6.7) (7.1) Total long-term debt 1,798.4 1,799.7 Less current maturities 15.3 15.0 Total long-term debt, net of current $ 1,783.1 $ 1,784.7

Asset Retirement Obligations _2

Asset Retirement Obligations (ARO) (Tables)	3 Months Ended
Asset Retirement Obligations (ARO) (Tables)	Mar. 31, 2024
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Reconciliation of Beginning and Ending Aggregate Carrying Amount of Asset Retirement Obligation	A reconciliation of the beginning and ending aggregate carrying amount of the ARO is shown in the following table. (Millions of dollars) March 31, December 31, Balance at beginning of period $ 46.1 $ 43.3 Accretion expense 0.8 3.0 Settlements of liabilities (1.3) (3.1) Liabilities incurred 0.2 2.9 Balance at end of period $ 45.8 $ 46.1

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
Income Taxes (Tables)	Mar. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Effective Income Tax Rates	For the three months ended March 31, 2024 and 2023, the Company’s approximate effective tax rates were as follows: 2024 2023 Three Months Ended March 31, 19.4% 23.5%

Incentive Plans (Tables)

Incentive Plans (Tables)	3 Months Ended
Incentive Plans (Tables)	Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule Valuation Assumptions	Assumptions used to value awards: Dividend yield 0.42 % Expected volatility 32.9 % Risk-free interest rate 4.3 % Expected life (years) 4.8 Stock price at valuation date $ 391.54
Schedule of Changes in Stock Options Outstanding	Changes in options outstanding for Company employees during the period from December 31, 2023 to March 31, 2024 are presented in the following table: Options Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (Millions of Dollars) Outstanding at December 31, 2023 291,050 $ 139.07 Granted 33,010 $ 393.03 Exercised (19,100) $ 92.53 Outstanding at March 31, 2024 304,960 $ 169.48 4.1 $ 76.2 Exercisable at March 31, 2024 205,825 $ 114.62 3.2 $ 62.7
Schedule of Stock Unit Activity	Changes in RSUs outstanding during the period from December 31, 2023 to March 31, 2024 are presented in the following table: RSUs Number of units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at December 31, 2023 120,800 $ 188.37 Granted 15,345 $ 392.96 Vested and issued (47,305) $ 133.44 $ 19.2 Forfeited (1,349) $ 221.17 Outstanding at March 31, 2024 87,491 $ 253.19 $ 36.7 Changes in PSUs outstanding for Company employees during the period from December 31, 2023 to March 31, 2024 are presented in the following table: Employee PSUs Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at December 31, 2023 95,582 $ 212.38 Granted 60,431 $ 482.74 Vested and issued (76,672) $ 148.38 $ 30.0 Outstanding at March 31, 2024 79,341 $ 318.45 $ 33.3 Changes in Director RSUs outstanding for Company non-employee directors during the period from December 31, 2023 to March 31, 2024 are presented in the following table: 2013 Plan — Director RSUs Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at December 31, 2023 23,654 $ 180.97 Granted 10 $ 411.81 Vested and issued (13,461) $ 170.52 $ 5.3 Outstanding at March 31, 2024 10,203 $ 194.78 $ 4.3

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
Earnings Per Share (Tables)	Mar. 31, 2024
Earnings Per Share [Abstract]
Schedule of Reconciliation of Basic and Diluted Earnings Per Share Computations	The following tables provide a reconciliation of basic and diluted earnings per share computations for the three months ended March 31, 2024 and 2023: Three Months Ended (Millions of dollars, except share and per share amounts) 2024 2023 Earnings per common share: Net income per share - basic Net income attributable to common stockholders $ 66.0 $ 106.3 Weighted average common shares outstanding (in thousands) 20,814 21,739 Earnings per common share $ 3.17 $ 4.89 Three Months Ended (Millions of dollars, except share and per share amounts) 2024 2023 Earnings per common share - assuming dilution: Net income per share - diluted Net income attributable to common stockholders $ 66.0 $ 106.3 Weighted average common shares outstanding (in thousands) 20,814 21,739 Common equivalent shares: Dilutive share-based awards 348 394 Weighted average common shares outstanding - assuming dilution 21,162 22,133 Earnings per common share assuming dilution $ 3.12 $ 4.80
Schedule of Potentially Dilutive Shares Excluded from Earnings Per Share	We have excluded from the earnings-per-share calculation certain stock options and shares that are considered to be anti-dilutive under the treasury stock method and are reported in the table below. Three Months Ended Potentially dilutive shares excluded from the calculation as their inclusion would be anti-dilutive 2024 2023 Stock Options 16,597 38,100 RSUs 151 — PSUs 5,689 12,767 Total anti-dilutive shares 22,437 50,867

Other Financial Information (Ta

Other Financial Information (Tables)	3 Months Ended
Other Financial Information (Tables)	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Changes in Working Capital	CHANGES IN WORKING CAPITAL: Three Months Ended (Millions of dollars) 2024 2023 Accounts receivable $ (45.7) $ 16.5 Inventories 48.6 15.5 Prepaid expenses and other current assets (5.7) 20.4 Accounts payable and accrued liabilities (9.3) (85.9) Income taxes payable 16.3 3.1 Net (increase) decrease in noncash operating working capital $ 4.2 $ (30.4)

Assets and Liabilities Measur_2

Assets and Liabilities Measured at Fair Value (Tables)	3 Months Ended
Assets and Liabilities Measured at Fair Value (Tables)	Mar. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the Company's financial assets and liabilities measured at fair value on a recurring basis, as of March 31, 2024 and December 31, 2023: March 31, 2024 (Millions of dollars) Level 1 Level 2 Level 3 Fair Value Financial assets Marketable securities, current U.S. Government bonds $ — $ 3.0 $ — $ 3.0 U.S. Corporate bonds — 3.1 — 3.1 Prepaid expenses and other current assets: Fuel derivative — — 0.6 0.6 Marketable securities, non-current U.S. Corporate bonds — 3.0 — 3.0 Non U.S. Corporate bonds — 1.5 — 1.5 Other assets Deferred compensation plan assets 13.9 — — 13.9 Financial liabilities Deferred credits and other liabilities Deferred compensation plan liabilities (23.0) — — (23.0) $ (9.1) $ 10.6 $ 0.6 $ 2.1 December 31, 2023 (Millions of dollars) Level 1 Level 2 Level 3 Fair Value Financial assets Marketable securities, current U.S. Government bonds $ — $ 3.0 $ — $ 3.0 U.S. Corporate bonds — 4.1 — 4.1 Prepaid expenses and other current assets: Fuel derivative — — 0.6 0.6 Marketable securities, non-current U.S. Corporate bonds — 2.9 — 2.9 Non U.S. Government bonds — 1.5 — 1.5 Other assets Deferred compensation plan assets 12.5 — — 12.5 Financial liabilities Deferred credits and other liabilities Deferred compensation plan liabilities (20.2) — — (20.2) $ (7.7) $ 11.5 $ 0.6 $ 4.4
Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments	The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at March 31, 2024 and December 31, 2023. At March 31, 2024 At December 31, 2023 Carrying Carrying (Millions of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt, excluding finance leases $ (1,672.9) $ (1,663.6) $ (1,673.0) $ (1,662.9)

Lease Accounting (Tables)

Lease Accounting (Tables)	3 Months Ended
Lease Accounting (Tables)	Mar. 31, 2024
Leases [Abstract]
Schedule of Leases Reflected on Balance Sheet	Leases are reflected in the following balance sheet accounts: (Millions of dollars) Classification March 31, December 31, Assets Operating (Right-of-use) Operating lease right-of-use assets, net $ 452.8 $ 452.1 Finance Property, plant, and equipment, at cost, less accumulated depreciation 111.9 113.8 Total leased assets $ 564.7 $ 565.9 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 22.2 $ 22.1 Finance Current maturities of long-term debt 11.3 11.0 Noncurrent Operating Non-current operating lease liabilities 452.1 450.3 Finance Long-term debt, including capitalized lease obligations 114.2 115.7 Total lease liabilities $ 599.8 $ 599.1
Schedule of Lease Cost, Cash flow Information, Lease Term and Discount Rate	Lease Cost: Three Months Ended (Millions of dollars) Classification 2024 2023 Operating lease cost Store and other operating expenses $ 14.1 $ 13.4 Finance lease cost Amortization of leased assets Depreciation and amortization 3.7 3.8 Interest on lease liabilities Interest expense 2.1 2.4 Net lease costs $ 19.9 $ 19.6 Cash Flow Information: Three Months Ended (Millions of dollars) 2024 2023 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 13.1 $ 12.3 Operating cash flows from finance leases $ 2.1 $ 2.4 Financing cash flows from finance leases $ 2.9 $ 2.8 Lease Term and Discount Rate: Three Months Ended March 31, 2024 Weighted average remaining lease term (years) Finance leases 12.0 Operating leases 15.0 Weighted average discount rate Finance leases 6.8 % Operating leases 6.6 %
Schedule of Finance Lease Liability Maturity	Maturity of Lease Liabilities at March 31, 2024: (Millions of dollars) Operating leases Finance leases 2024 $ 40.1 $ 14.6 2025 53.2 18.5 2026 52.5 17.4 2027 51.7 16.3 2028 51.2 15.6 After 2028 550.0 106.9 Total lease payments 798.7 189.3 less: interest 324.4 63.8 Present value of lease liabilities $ 474.3 $ 125.5
Schedule of Operating Lease Liability Maturity	Maturity of Lease Liabilities at March 31, 2024: (Millions of dollars) Operating leases Finance leases 2024 $ 40.1 $ 14.6 2025 53.2 18.5 2026 52.5 17.4 2027 51.7 16.3 2028 51.2 15.6 After 2028 550.0 106.9 Total lease payments 798.7 189.3 less: interest 324.4 63.8 Present value of lease liabilities $ 474.3 $ 125.5

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
Business Segments (Tables)	Mar. 31, 2024
Segment Reporting [Abstract]
Schedule of Information by Business Segment	Three Months Ended March 31, 2024 March 31, 2023 (Millions of dollars) Total Assets at March 31, 2024 External Revenues Income (Loss) External Revenues Income (Loss) Marketing $ 4,106.9 $ 4,843.6 $ 85.5 $ 5,077.1 $ 125.9 Corporate and other assets 200.1 0.1 (19.5) 0.1 (19.6) Total $ 4,307.0 $ 4,843.7 $ 66.0 $ 5,077.2 $ 106.3

Description of Business and B_3

Description of Business and Basis of Presentation (Details)		1 Months Ended
Description of Business and Basis of Presentation (Details)	Aug. 30, 2013	Mar. 31, 2013 USD ($) $ / shares shares	Mar. 31, 2024 store $ / shares	Dec. 31, 2023 $ / shares
Product Information [Line Items]
Number of stores			1,733
Common stock shares issued (in shares) \| shares		100
Common stock par value (in dollars per share) \| $ / shares		$ 0.01	$ 0.01	$ 0.01
Proceeds from issuance of common stock \| $		$ 1
Percentage of shares of stock distributed	100%
Murphy
Product Information [Line Items]
Number of stores			1,579
QuickChek
Product Information [Line Items]
Number of stores			154

Revenues (Disaggregation of Rev

Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 4,843.7	$ 5,077.2
Total petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue	3,811.7	3,994.2
Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue	3,427.6	3,586.1
Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue	384.1	408.1
Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	1,000.7	966.2
RINs
Disaggregation of Revenue [Line Items]
Revenue	29.4	115.3
Other revenues
Disaggregation of Revenue [Line Items]
Revenue	1.9	1.5
Operating Segment \| Marketing
Disaggregation of Revenue [Line Items]
Revenue	4,843.6	5,077.1
Operating Segment \| Marketing \| Total petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue	3,811.7	3,994.2
Operating Segment \| Marketing \| Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue	3,427.6	3,586.1
Operating Segment \| Marketing \| Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue	384.1	408.1
Operating Segment \| Marketing \| Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	1,000.7	966.2
Operating Segment \| Marketing \| RINs
Disaggregation of Revenue [Line Items]
Revenue	29.4	115.3
Operating Segment \| Marketing \| Other revenues
Disaggregation of Revenue [Line Items]
Revenue	1.8	1.4
Corporate and Other Assets
Disaggregation of Revenue [Line Items]
Revenue	0.1	0.1
Corporate and Other Assets \| Total petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corporate and Other Assets \| Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corporate and Other Assets \| Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue	0	0
Corporate and Other Assets \| Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	0
Corporate and Other Assets \| RINs
Disaggregation of Revenue [Line Items]
Revenue	0
Corporate and Other Assets \| Other revenues
Disaggregation of Revenue [Line Items]
Revenue	$ 0.1	$ 0.1

Revenues (Narrative) (Details)

Revenues (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Revenues (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Reward program expiration period	90 days
Trade accounts receivable	$ 380.5	$ 336.7
Trade Accounts Receivable
Disaggregation of Revenue [Line Items]
Trade accounts receivable	$ 240	$ 178.2
Bulk pipelines sales
Disaggregation of Revenue [Line Items]
Collection period	7 days
Petroleum product sales, rack sales \| Marketing
Disaggregation of Revenue [Line Items]
Collection period	10 days
RINs \| Marketing
Disaggregation of Revenue [Line Items]
Collection period	5 days
Minimum \| Petroleum product sales (at retail) \| Marketing
Disaggregation of Revenue [Line Items]
Collection period	2 days
Maximum \| Petroleum product sales (at retail) \| Marketing
Disaggregation of Revenue [Line Items]
Collection period	7 days

Inventories (Schedule of Invent

Inventories (Schedule of Inventories) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Petroleum products - FIFO basis	$ 356.8	$ 331.2
Store merchandise for resale - FIFO basis	198	209.1
Less LIFO reserve	(274.3)	(212.1)
Total petroleum products and store merchandise inventory	280.5	328.2
Materials and supplies	12.2	13
Inventories, at lower of cost or market	$ 292.7	$ 341.2

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
LIFO reserve	$ 274.3	$ 212.1
Petroleum Products
Inventory [Line Items]
LIFO reserve	271.6	209.7
Store Merchandise For Resale
Inventory [Line Items]
LIFO reserve	$ 2.7	$ 2.4

Marketable Securities (Narrativ

Marketable Securities (Narrative) (Details)	Mar. 31, 2024 USD ($)
Investments, Debt and Equity Securities [Abstract]
Maturity	24 months
Weighted average maturity	12 months
Net asset value	$ 1

Marketable Securities (Schedule

Marketable Securities (Schedule of Amortized Cost and Carrying Values of Marketable Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 10.6	$ 11.5
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated fair value, current	6.1	7.1
Estimated fair value, noncurrent	4.5	4.4
Estimated Fair Value	10.6	11.5
Marketable securities current
Debt Securities, Available-for-Sale [Line Items]
Amortized cost current	6.1	7.1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated fair value, current	6.1	7.1
U.S. Government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized cost current	3	3
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated fair value, current	3	3
U.S. Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized cost current	3	3.9
Amortized cost, noncurrent	3	2.9
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated fair value, current	3	3.9
Estimated fair value, noncurrent	3	2.9
Investment income receivable
Debt Securities, Available-for-Sale [Line Items]
Amortized cost current	0.1	0.2
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated fair value, current	0.1	0.2
Non U.S. Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized cost, noncurrent	1.5	1.5
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated fair value, noncurrent	1.5	1.5
Marketable securities non-current
Debt Securities, Available-for-Sale [Line Items]
Amortized cost, noncurrent	4.5	4.4
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated fair value, noncurrent	$ 4.5	$ 4.4

Marketable Securities (Schedu_2

Marketable Securities (Schedule of Amortized Cost Basis and Fair Value of Available-for-Sale Marketable Securities Excluding Investment Income Receivable) (Details) $ in Millions	Mar. 31, 2024 USD ($)
Amortized Cost
Less than 1 year	$ 10.5
Fair Value
Less than 1 year	$ 10.5

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Narratives) (Details)	Mar. 31, 2024 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Tax deductible goodwill	$ 0
Pipeline space
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining useful life	40 years

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets (Schedule of Changes in Goodwill) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 328	$ 328

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Cost
Total intangible assets subject to amortization	$ 30.5	$ 30.5
Intangible assets, net of amortization	145.9	145.9
Net
Total intangible assets subject to amortization	24.3	24.4
Intangible assets, net of amortization	139.7	139.8
Trade name
Cost
Intangible assets not subject to amortization, indefinite lives:	115.4	115.4
Net
Intangible assets not subject to amortization, indefinite lives:	$ 115.4	115.4
Pipeline space
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life (in years)	31 years 4 months 24 days
Cost
Pipeline space	$ 39.6	39.6
Net
Pipeline space	$ 31.4	31.7
Intangible lease liability
Acquired Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life (in years)	10 years 2 months 12 days
Cost
Intangible lease liability	$ (9.1)	(9.1)
Net
Intangible lease liability	$ (7.1)	$ (7.3)

Long-Term Debt (Schedule of Lon

Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Jan. 29, 2021	Sep. 13, 2019	Apr. 25, 2017
Debt Instrument [Line Items]
Capitalized lease obligations	$ 125.5
Unamortized debt issuance costs	(6.7)	$ (7.1)
Total long-term debt	1,798.4	1,799.7
Less current maturities	15.3	15
Total long-term debt, net of current	1,783.1	1,784.7
Capitalized lease obligations, autos and equipment, due through 2026
Debt Instrument [Line Items]
Capitalized lease obligations	3.7	3.1
Capitalized lease obligations, buildings, due through 2059
Debt Instrument [Line Items]
Capitalized lease obligations	121.8	123.6
Senior Notes \| 5.625% senior notes due 2027 (net of unamortized discount of $1.2 at March 31, 2024 and $1.3 at December 31, 2023)
Debt Instrument [Line Items]
Long-term debt, gross	$ 298.8	298.7
Stated interest rate	5.625%				5.625%
Unamortized discount	$ 1.2	1.3
Senior Notes \| 4.75% senior notes due 2029 (net of unamortized discount of $3.4 at March 31, 2024 and $3.6 at December 31, 2023)
Debt Instrument [Line Items]
Long-term debt, gross	$ 496.6	496.4
Stated interest rate	4.75%			4.75%
Unamortized discount	$ 3.4	3.6
Senior Notes \| 3.75% senior notes due 2031 (net of unamortized discount of $4.3 at March 31, 2024 and $4.4 at December 31, 2023)
Debt Instrument [Line Items]
Long-term debt, gross	$ 495.7	495.6
Stated interest rate	3.75%		3.75%
Unamortized discount	$ 4.3	4.4
Secured Debt \| Term loan due 2028 (effective interest rate of 7.21% at March 31, 2024 and 7.23% at December 31, 2023 and net of unamortized discount of $0.5 at March 31, 2024 and $0.6 at December 31, 2023) \| Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	388.5	389.4
Unamortized discount	$ 0.5	$ 0.6
Effective interest rate	7.21%	7.23%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	Jul. 01, 2021	Jan. 29, 2021	Mar. 31, 2024	Dec. 31, 2023	Sep. 13, 2019	Apr. 25, 2017
Debt Instrument [Line Items]
Outstanding letters of credit			$ 10,200,000
Line of Credit \| Term Loan
Debt Instrument [Line Items]
Senior notes, principal amount		$ 400,000,000
Quarterly amortization payment		1%
Line of Credit \| Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Spread over variable rate		0.50%
Line of Credit \| Term Loan \| One Month Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Spread over variable rate		1%
Line of Credit \| Term Loan \| Adjusted SOFR Rate
Debt Instrument [Line Items]
Spread over variable rate		1.75%
Line of Credit \| Term Loan \| Alternate Base Rate
Debt Instrument [Line Items]
Spread over variable rate		0.75%
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 350,000,000
Outstanding balance			389,000,000	$ 390,000,000
Principal payment period	$ 1,000,000
Outstanding under facility			$ 0
Total leverage ratio		5
Temporary increase to leverage ratio		5.5
Secured net leverage ratio financial maintenance covenants		3.75
Temporary increase to secured net leverage ratio financial maintenance covenants		4.25
Leverage ratio		3
Actual total leverage ratio			1.76
Maximum restricted payments in cash		$ 113,600,000
Maximum consolidated net tangible assets over the life of the credit agreement		4.50%
Line of Credit \| Revolving Credit Facility \| One Month Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Spread over variable rate		1%
Line of Credit \| Revolving Credit Facility \| Adjusted SOFR Rate
Debt Instrument [Line Items]
Spread over variable rate		0.10%
Line of Credit \| Revolving Credit Facility \| Adjusted SOFR Rate \| Minimum
Debt Instrument [Line Items]
Spread over variable rate		1.75%
Line of Credit \| Revolving Credit Facility \| Adjusted SOFR Rate \| Maximum
Debt Instrument [Line Items]
Spread over variable rate		2.25%
Line of Credit \| Revolving Credit Facility \| Alternate Base Rate \| Minimum
Debt Instrument [Line Items]
Spread over variable rate		0.75%
Line of Credit \| Revolving Credit Facility \| Alternate Base Rate \| Maximum
Debt Instrument [Line Items]
Spread over variable rate		1.25%
Line of Credit \| Revolving Credit Facility \| Floor Rate
Debt Instrument [Line Items]
Spread over variable rate		0%
Line of Credit \| Letters of credit
Debt Instrument [Line Items]
Outstanding letters of credit			$ 6,200,000
5.625% senior notes due 2027 (net of unamortized discount of $1.2 at March 31, 2024 and $1.3 at December 31, 2023) \| Senior Notes
Debt Instrument [Line Items]
Senior notes, principal amount						$ 300,000,000
Interest rate			5.625%			5.625%
4.75% senior notes due 2029 (net of unamortized discount of $3.4 at March 31, 2024 and $3.6 at December 31, 2023) \| Senior Notes
Debt Instrument [Line Items]
Senior notes, principal amount					$ 500,000,000
Interest rate			4.75%		4.75%
3.75% senior notes due 2031 (net of unamortized discount of $4.3 at March 31, 2024 and $4.4 at December 31, 2023) \| Senior Notes
Debt Instrument [Line Items]
Senior notes, principal amount		$ 500,000,000
Interest rate		3.75%	3.75%

Asset Retirement Obligations _3

Asset Retirement Obligations (ARO) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Asset Retirement Obligation Roll Forward
Balance at beginning of period	$ 46.1	$ 43.3	$ 43.3
Accretion expense	0.8	$ 0.8	3
Settlements of liabilities	(1.3)		(3.1)
Liabilities incurred	0.2		2.9
Balance at end of period	$ 45.8		$ 46.1

Income Taxes (Schedule of Effec

Income Taxes (Schedule of Effective Income Tax Rates) (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Effective income tax rate	19.40%	23.50%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Total excess tax benefits	$ 4.2	$ 2.1
Other discrete tax items	$ 0.1	$ 0.2

Incentive Plans (Narrative) (De

Incentive Plans (Narrative) (Details)	1 Months Ended	3 Months Ended
Incentive Plans (Narrative) (Details)	Feb. 29, 2024 peer_company $ / shares	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 $ / shares shares	May 04, 2023 shares	Aug. 08, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation \| $		$ 5,600,000	$ 4,900,000
Total income tax benefits realized from tax deductions related to stock option exercises under share-based payment arrangements \| $		$ 500,000	$ 100,000
MUSA 2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for incentive plan (no more than) (in shares)		5,500,000
Number of shares per employee (no more than) (in shares)		1,000,000
Maximum amount payable \| $		$ 5,000,000
MUSA 2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for incentive plan (no more than) (in shares)					1,725,000
Award expiration period (in years)		7 years
Shares granted, fair value (in dollars per share) \| $ / shares	$ 133.91
MUSA 2023 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
MUSA 2023 Plan \| RSUs \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		1 year
Granted (in shares)		15,345
Outstanding (in shares)		87,491		120,800
Weighted average grant date fair value (in dollars per share) \| $ / shares		$ 253.19		$ 188.37
Restricted stock units issued, weighted average grant date fair value (in dollars per share) \| $ / shares		$ 392.96
Vested (in shares)		47,305
MUSA 2023 Plan \| RSUs \| In 2023 \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		1 year
MUSA 2023 Plan \| DSUs \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share of common stock right		1
Granted (in shares)		206
Share-based compensation \| $		$ 100,000
Outstanding (in shares)		1,209
Weighted average grant date fair value (in dollars per share) \| $ / shares		$ 349.46
MUSA 2023 Plan \| Return On Average Capital Employed Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
MUSA 2023 Plan \| Total Shareholder Return Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Number of companies in total shareholder return peer comparison group \| peer_company	17
MUSA 2023 Plan \| PSUs \| TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 569.58
MUSA 2023 Plan \| PSUs \| ROACE
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 391.54
2013 Directors Plan \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for incentive plan (no more than) (in shares)						500,000
2013 Directors Plan \| RSUs \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		10
Outstanding (in shares)		10,203		23,654
Weighted average grant date fair value (in dollars per share) \| $ / shares		$ 194.78		$ 180.97
Restricted stock units issued, weighted average grant date fair value (in dollars per share) \| $ / shares		$ 411.81
Vested (in shares)		13,461
2013 Directors Plan \| RSUs \| In 2023 \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		1 year
2013 Directors Plan \| RSUs \| Prior to 2023 \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
2013 Directors Plan \| DSUs \| Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share of common stock right		1
Granted (in shares)		2
Outstanding (in shares)		425
Weighted average grant date fair value (in dollars per share) \| $ / shares		$ 258.35
Vested (in shares)		2

Incentive Plans (Valuation Assu

Incentive Plans (Valuation Assumptions) (Details)	3 Months Ended
Incentive Plans (Valuation Assumptions) (Details)	Mar. 31, 2024 $ / shares
Share-Based Payment Arrangement [Abstract]
Dividend yield	0.42%
Expected volatility	32.90%
Risk-free interest rate	4.30%
Expected life (years)	4 years 9 months 18 days
Stock price at valuation date (in dollars per share)	$ 391.54

Incentive Plans (Schedule of Ch

Incentive Plans (Schedule of Changes in Stock Options Outstanding) (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares
Number of Shares
Beginning balance (in shares) \| shares	291,050
Granted (in shares) \| shares	33,010
Exercised (in shares) \| shares	(19,100)
Ending balance (in shares) \| shares	304,960
Exercisable (in shares) \| shares	205,825
Weighted Average Exercise Price
Beginning balance (in dollars per share) \| $ / shares	$ 139.07
Granted (in dollars per share) \| $ / shares	393.03
Exercised (in dollars per share) \| $ / shares	92.53
Ending balance (in dollars per share) \| $ / shares	169.48
Exercisable (in dollars per share) \| $ / shares	$ 114.62
Weighted Average Remaining Contractual Term (Years)
Outstanding, weighted average remaining contractual term (in years)	4 years 1 month 6 days
Exercisable, weighted average remaining contractual term (in years)	3 years 2 months 12 days
Aggregate Intrinsic Value (Millions of Dollars)
Outstanding, aggregate intrinsic value \| $	$ 76.2
Exercisable, aggregate intrinsic value \| $	$ 62.7

Incentive Plans (Schedule of St

Incentive Plans (Schedule of Stock Unit Activity) (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares
RSUs \| MUSA 2023 Plan \| Non-employee directors
Number of units
Beginning balance (in shares) \| shares	120,800
Granted (in shares) \| shares	15,345
Vested (in shares) \| shares	(47,305)
Issued (in shares) \| shares	(47,305)
Forfeited (in shares) \| shares	(1,349)
Ending balance (in shares) \| shares	87,491
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) \| $ / shares	$ 188.37
Granted (in dollars per share) \| $ / shares	392.96
Vested (in dollars per share) \| $ / shares	133.44
Issued (in dollars per share) \| $ / shares	133.44
Forfeited (in dollars per share) \| $ / shares	221.17
Ending balance (in dollars per share) \| $ / shares	$ 253.19
Total Fair Value
Total fair value vested \| $	$ 19.2
Total fair value issued \| $	19.2
Total fair value, outstanding \| $	$ 36.7
RSUs \| 2013 Directors Plan \| Non-employee directors
Number of units
Beginning balance (in shares) \| shares	23,654
Granted (in shares) \| shares	10
Vested (in shares) \| shares	(13,461)
Issued (in shares) \| shares	(13,461)
Ending balance (in shares) \| shares	10,203
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) \| $ / shares	$ 180.97
Granted (in dollars per share) \| $ / shares	411.81
Vested (in dollars per share) \| $ / shares	170.52
Issued (in dollars per share) \| $ / shares	170.52
Ending balance (in dollars per share) \| $ / shares	$ 194.78
Total Fair Value
Total fair value vested \| $	$ 5.3
Total fair value issued \| $	5.3
Total fair value, outstanding \| $	$ 4.3
Employee PSUs \| MUSA 2023 Plan \| Employees
Number of units
Beginning balance (in shares) \| shares	95,582
Granted (in shares) \| shares	60,431
Vested (in shares) \| shares	(76,672)
Issued (in shares) \| shares	(76,672)
Ending balance (in shares) \| shares	79,341
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) \| $ / shares	$ 212.38
Granted (in dollars per share) \| $ / shares	482.74
Vested (in dollars per share) \| $ / shares	148.38
Issued (in dollars per share) \| $ / shares	148.38
Ending balance (in dollars per share) \| $ / shares	$ 318.45
Total Fair Value
Total fair value vested \| $	$ 30
Total fair value issued \| $	30
Total fair value, outstanding \| $	$ 33.3

Financial Instruments and Ris_2

Financial Instruments and Risk Management (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Derivative [Line Items]
Cash deposits related to commodity derivative contracts	$ 0.1		$ 1
Accumulated other comprehensive loss reclassified to interest expense	$ 0	$ (0.2)
Interest rate swap derivative
Derivative [Line Items]
Accumulated other comprehensive loss reclassified to interest expense		$ 0.2

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - USD ($)	3 Months Ended
Earnings Per Share (Narrative) (Details) - USD ($)	Mar. 31, 2024	Mar. 31, 2023	May 02, 2023
2023 Share Repurchase Authorization
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount			$ 1,500,000,000
Stock repurchase program, remaining amount	$ 1,300,000,000
Treasury stock, shares acquired (in shares)	216,036
Stock repurchase program, average price per share (in dollars per share)	$ 402.14
2021 Share Repurchase Authorization
Equity, Class of Treasury Stock [Line Items]
Treasury stock, shares acquired (in shares)		48,848
Stock repurchase program, average price per share (in dollars per share)		$ 279.67

Earnings Per Share (Reconciliat

Earnings Per Share (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings per common share:
Net income attributable to common stockholders	$ 66	$ 106.3
Weighted average common shares outstanding (in shares)	20,814	21,739
Earnings per common share (in dollars per share)	$ 3.17	$ 4.89
Earnings per common share - assuming dilution:
Net income attributable to common stockholders	$ 66	$ 106.3
Weighted average common shares outstanding (in shares)	20,814	21,739
Common equivalent shares:
Dilutive share-based awards (in shares)	348	394
Weighted average common shares outstanding - assuming dilution (in shares)	21,162	22,133
Earnings per common share assuming dilution (in dollars per share)	$ 3.12	$ 4.80

Earnings Per Share (Potentially

Earnings Per Share (Potentially Dilutive Shares Excluded from Earnings Per Share) (Details) - shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	22,437	50,867
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	16,597	38,100
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	151	0
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	5,689	12,767

Other Financial Information (Na

Other Financial Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash income taxes received	$ (0.1)	$ (0.3)
Interest paid, net of amounts capitalized	$ 30.4	$ 29.2

Other Financial Information (Ch

Other Financial Information (Changes in Working Capital) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ (45.7)	$ 16.5
Inventories	48.6	15.5
Prepaid expenses and other current assets	(5.7)	20.4
Accounts payable and accrued liabilities	(9.3)	(85.9)
Income taxes payable	16.3	3.1
Net (increase) decrease in noncash operating working capital	$ 4.2	$ (30.4)

Assets and Liabilities Measur_3

Assets and Liabilities Measured at Fair Value (Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financial assets
Marketable securities, current	$ 6.1	$ 7.1
U.S. Corporate bonds	4.5	4.4
Non U.S. Corporate bonds
Financial assets
U.S. Corporate bonds	1.5	1.5
Recurring
Financial assets
Derivatives		0.6
Financial liabilities
Fair value, net asset (liability)	2.1	4.4
Recurring \| Fuel derivative
Financial assets
Derivatives	0.6
Recurring \| Deferred compensation plan liabilities
Financial liabilities
Deferred compensation plan liabilities	(23)	(20.2)
Recurring \| Deferred compensation plan assets
Financial assets
Deferred compensation plan assets	13.9	12.5
Recurring \| U.S. Government bonds
Financial assets
Marketable securities, current	3	3
Recurring \| U.S. Corporate bonds
Financial assets
Marketable securities, current	3.1	4.1
U.S. Corporate bonds	3	2.9
Recurring \| Non U.S. Corporate bonds
Financial assets
U.S. Corporate bonds	1.5
Recurring \| Non U.S. Government bonds
Financial assets
U.S. Corporate bonds		1.5
Recurring \| Level 1
Financial assets
Derivatives		0
Financial liabilities
Fair value, net asset (liability)	(9.1)	(7.7)
Recurring \| Level 1 \| Fuel derivative
Financial assets
Derivatives	0
Recurring \| Level 1 \| Deferred compensation plan liabilities
Financial liabilities
Deferred compensation plan liabilities	(23)	(20.2)
Recurring \| Level 1 \| Deferred compensation plan assets
Financial assets
Deferred compensation plan assets	13.9	12.5
Recurring \| Level 1 \| U.S. Government bonds
Financial assets
Marketable securities, current	0	0
Recurring \| Level 1 \| U.S. Corporate bonds
Financial assets
Marketable securities, current	0	0
U.S. Corporate bonds	0	0
Recurring \| Level 1 \| Non U.S. Corporate bonds
Financial assets
U.S. Corporate bonds	0
Recurring \| Level 1 \| Non U.S. Government bonds
Financial assets
U.S. Corporate bonds		0
Recurring \| Level 2
Financial assets
Derivatives		0
Financial liabilities
Fair value, net asset (liability)	10.6	11.5
Recurring \| Level 2 \| Fuel derivative
Financial assets
Derivatives	0
Recurring \| Level 2 \| Deferred compensation plan liabilities
Financial liabilities
Deferred compensation plan liabilities	0	0
Recurring \| Level 2 \| Deferred compensation plan assets
Financial assets
Deferred compensation plan assets	0	0
Recurring \| Level 2 \| U.S. Government bonds
Financial assets
Marketable securities, current	3	3
Recurring \| Level 2 \| U.S. Corporate bonds
Financial assets
Marketable securities, current	3.1	4.1
U.S. Corporate bonds	3	2.9
Recurring \| Level 2 \| Non U.S. Corporate bonds
Financial assets
U.S. Corporate bonds	1.5
Recurring \| Level 2 \| Non U.S. Government bonds
Financial assets
U.S. Corporate bonds		1.5
Recurring \| Level 3
Financial assets
Derivatives		0.6
Financial liabilities
Fair value, net asset (liability)	0.6	0.6
Recurring \| Level 3 \| Fuel derivative
Financial assets
Derivatives	0.6
Recurring \| Level 3 \| Deferred compensation plan liabilities
Financial liabilities
Deferred compensation plan liabilities	0	0
Recurring \| Level 3 \| Deferred compensation plan assets
Financial assets
Deferred compensation plan assets	0	0
Recurring \| Level 3 \| U.S. Government bonds
Financial assets
Marketable securities, current	0	0
Recurring \| Level 3 \| U.S. Corporate bonds
Financial assets
Marketable securities, current	0	0
U.S. Corporate bonds	0	0
Recurring \| Level 3 \| Non U.S. Corporate bonds
Financial assets
U.S. Corporate bonds	$ 0
Recurring \| Level 3 \| Non U.S. Government bonds
Financial assets
U.S. Corporate bonds		$ 0

Assets and Liabilities Measur_4

Assets and Liabilities Measured at Fair Value (Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current and long-term debt, excluding finance leases	$ (1,672.9)	$ (1,673)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current and long-term debt, excluding finance leases	$ (1,663.6)	$ (1,662.9)

Contingencies (Details)

Contingencies (Details) $ in Millions	3 Months Ended
Contingencies (Details) $ in Millions	Mar. 31, 2024 USD ($) superfund_site
Commitments and Contingencies Disclosure [Abstract]
Number of superfund sites for which company may be liable \| superfund_site	1
Workers' compensation deductible (per occurrence)	$ 1
General liability insurance deductible	3
Auto liability insurance deductible	0.3
Workers' compensation accrued liability	47.9
Outstanding letters of credit	$ 10.2

Lease Accounting (Narrative) (D

Lease Accounting (Narrative) (Details)	3 Months Ended
Lease Accounting (Narrative) (Details)	Mar. 31, 2024 extensionOption lease
Lessee, Lease, Description [Line Items]
Number of renewal options \| extensionOption	1
Number of leases with restrictive covenants	102
Land
Lessee, Lease, Description [Line Items]
Number of leases	451
Terminal
Lessee, Lease, Description [Line Items]
Number of leases	1
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	2 years
Lease renewal term (in years)	5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term (in years)	36 years
Lease renewal term (in years)	20 years

Lease Accounting (Leases Reflec

Lease Accounting (Leases Reflected on Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets
Operating (Right-of-use)	$ 452.8	$ 452.1
Finance	111.9	113.8
Total leased assets	564.7	565.9
Accumulated depreciation	46.1	42.6
Current
Operating	22.2	22.1
Finance	11.3	11
Noncurrent
Operating	452.1	450.3
Finance	114.2	115.7
Total lease liabilities	$ 599.8	$ 599.1
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,784.2 and $1,739.2 at 2024 and 2023, respectively	Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,784.2 and $1,739.2 at 2024 and 2023, respectively
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Trade accounts payable and accrued liabilities	Trade accounts payable and accrued liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Current maturities of long-term debt	Current maturities of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Long-term debt, including capitalized lease obligations	Long-term debt, including capitalized lease obligations

Lease Accounting (Lease Cost) (

Lease Accounting (Lease Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Leases [Abstract]
Operating lease cost	$ 14.1	$ 13.4
Finance lease cost
Amortization of leased assets	3.7	3.8
Interest on lease liabilities	2.1	2.4
Net lease costs	$ 19.9	$ 19.6

Lease Accounting (Cash Flow Inf

Lease Accounting (Cash Flow Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash paid for amounts included in the measurement of liabilities
Operating cash flows from operating leases	$ 13.1	$ 12.3
Operating cash flows from finance leases	2.1	2.4
Financing cash flows from finance leases	$ 2.9	$ 2.8

Lease Accounting (Maturity of L

Lease Accounting (Maturity of Lease Liability) (Details) $ in Millions	Mar. 31, 2024 USD ($)
Operating leases
2024	$ 40.1
2025	53.2
2026	52.5
2027	51.7
2028	51.2
After 2028	550
Total lease payments	798.7
less: interest	324.4
Present value of lease liabilities	474.3
Finance leases
2024	14.6
2025	18.5
2026	17.4
2027	16.3
2028	15.6
After 2028	106.9
Total lease payments	189.3
less: interest	63.8
Present value of lease liabilities	$ 125.5

Lease Accounting (Lease Term an

Lease Accounting (Lease Term and Discount Rate) (Details)	Mar. 31, 2024
Weighted average remaining lease term (years)
Finance leases	12 years
Operating leases	15 years
Weighted average discount rate
Finance leases	6.80%
Operating leases	6.60%

Business Segments (Narrative) (

Business Segments (Narrative) (Details)	3 Months Ended
Business Segments (Narrative) (Details)	Mar. 31, 2024 segment
Segment Reporting [Abstract]
Number of operating segments	1

Business Segments (Schedule of

Business Segments (Schedule of Information by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total assets	$ 4,307		$ 4,340.1
External Revenues	4,843.7	$ 5,077.2
Income (Loss)	66	106.3
Corporate and other assets
Segment Reporting Information [Line Items]
Total assets	200.1
External Revenues	0.1	0.1
Income (Loss)	(19.5)	(19.6)
Marketing \| Marketing
Segment Reporting Information [Line Items]
Total assets	4,106.9
External Revenues	4,843.6	5,077.1
Income (Loss)	$ 85.5	$ 125.9