Murphy USA (MUSA) 10-Q 29 Oct 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page	9 Months Ended
	Sep. 30, 2020shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
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	28,567,716
Amendment Flag	false
Entity Central Index Key	0001573516
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 317.5			$ 280.3
Accounts receivable—trade, less allowance for doubtful accounts of $0.1 at 2020 and $1.2 at 2019	142.7			172.9
Inventories, at lower of cost or market	268.1			227.6
Prepaid expenses and other current assets	14.9			30
Total current assets	743.2			710.8
Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,151.3 at 2020 and $1,079.2 at 2019	1,854			1,807.3
Other assets	191			169.1
Total assets	2,788.2			2,687.2
Current liabilities
Current maturities of long-term debt	51.2			38.8
Trade accounts payable and accrued liabilities	442.8			466.2
Income taxes payable	19.4			0
Total current liabilities	513.4			505
Long-term debt, including capitalized lease obligations	963.2			999.3
Deferred income taxes	217.5			216.7
Asset retirement obligations	34			32.8
Deferred credits and other liabilities	164.4			130.4
Total liabilities	1,892.5			1,884.2
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 2020 and 2019, respectively)	0.5			0.5
Treasury stock (18,199,448 and 16,307,048 shares held at 2020 and 2019, respectively)	(1,321.8)			(1,099.8)
Additional paid in capital (APIC)	530			538.7
Retained earnings	1,689.1			1,362.9
Accumulated other comprehensive income (loss) (AOCI)	(2.1)			0.7
Total stockholders' equity	895.7	$ 918	$ 746.8	803	$ 779	$ 816.3	$ 797.8	$ 807.3
Total liabilities and stockholders' equity	$ 2,788.2			$ 2,687.2

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 0.1	$ 1.2
Property, plant and equipment, accumulated depreciation and amortization	$ 1,151.3	$ 1,079.2
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	$ 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)	18,199,448	16,307,048

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Revenues
Total operating revenues		$ 2,839	$ 3,657.6	$ 8,403.4	$ 10,574.4
Operating Expenses
Depreciation and amortization		40.6	37.6	119.5	113.8
Selling, general and administrative		53.7	36	130	105.7
Accretion of asset retirement obligations		0.6	0.6	1.7	1.6
Total operating expenses		2,738.7	3,537.1	7,938.2	10,379.6
Net settlement proceeds		0	0	0	0.1
Gain (loss) on sale of assets		0	0.2	1.4	0.1
Income (loss) from operations		100.3	120.7	466.6	195
Other income (expense)
Interest income		0	0.8	1	2.4
Interest expense		(12.4)	(15.3)	(38.7)	(42.1)
Loss on early debt extinguishment		0	(14.8)	0	(14.8)
Other nonoperating income (expense)		0.2	(0.1)	(0.5)	0
Total other income (expense)		(12.2)	(29.4)	(38.2)	(54.5)
Income (loss) before income taxes		88.1	91.3	428.4	140.5
Income tax expense (benefit)		21.2	22.1	103.3	33.3
Net Income		$ 66.9	$ 69.2	$ 325.1	$ 107.2
Basic and Diluted Earnings Per Common Share
Basic (in dollars per share)		$ 2.30	$ 2.20	$ 11	$ 3.35
Diluted (in dollars per share)		$ 2.27	$ 2.18	$ 10.88	$ 3.33
Weighted-Average Common Shares Outstanding (in thousands):
Basic (in shares)		29,111	31,447	29,546	31,961
Diluted (in shares)		29,499	31,704	29,887	32,189
Supplemental information:
Excise taxes		$ 447	$ 498.9	$ 1,300.7	$ 1,452.5
Product
Operating Revenues
Total operating revenues	[1]	2,056	2,965.5	6,125.1	8,595
Operating Expenses
Operating expenses	[1]	1,862.2	2,749.6	5,409.8	8,104.8
Merchandise sales
Operating Revenues
Total operating revenues		756.8	681.1	2,211.4	1,946.1
Operating Expenses
Operating expenses		638.7	569.9	1,867.4	1,631.9
Other operating revenues
Operating Revenues
Total operating revenues		26.2	11	66.9	33.3
Operating Expenses
Operating expenses		$ 142.9	$ 143.4	$ 409.8	$ 421.8
[1]	Includes excise taxes of $447.0 million for the three months ended September 30, 2020, $498.9 million for the three months ended September 30, 2019, $1,300.7 million for the nine months ended September 30, 2020 and $1,452.5 million the nine months ended September 30, 2019.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 66.9	$ 69.2	$ 325.1	$ 107.2
Interest rate swap:
Realized gain (loss)	(0.4)	0	(0.5)	0
Unrealized gain (loss)	0.5	0	(3.7)	0
Reclassified to interest expense	0.4	0	0.5	0
Total	0.5	0	(3.7)	0
Deferred income tax (benefit) expense	0.1	0	(0.9)	0
Other comprehensive income (loss)	0.4	0	(2.8)	0
Comprehensive income	$ 67.3	$ 69.2	$ 322.3	$ 107.2

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Activities
Net income	$ 66.9	$ 168.9	$ 89.3	$ 69.2	$ 32.7	$ 5.3	$ 325.1	$ 107.2
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	40.6			37.6			119.5	113.8
Deferred and noncurrent income tax charges (credits)							1.7	6.9
Accretion of asset retirement obligations	0.6			0.6			1.7	1.6	$ 2.1
Pretax (gains) losses from sale of assets	0			(0.2)			(1.4)	(0.1)
Net (increase) decrease in noncash operating working capital							(2.2)	(3.7)
Loss on early debt extinguishment	0			14.8			0	14.8
Other operating activities - net							23.4	11.1
Net cash provided by (required by) operating activities							467.8	251.6
Investing Activities
Property additions							(169.4)	(153.7)
Proceeds from sale of assets							7.7	2.4
Other investing activities - net							(1.6)	(0.7)
Net cash provided by (required by) investing activities							(163.3)	(152)
Financing Activities
Purchase of treasury stock							(230.5)	(139.1)
Borrowings of debt							0	693.7
Repayments of debt							(26.1)	(573.1)
Debt issuance costs							0	(3.1)
Early debt extinguishment costs							0	(10.4)
Amounts related to share-based compensation							(10.7)	(4.4)
Net cash provided by (required by) financing activities							(267.3)	(36.4)
Net increase (decrease) in cash, cash equivalents, and restricted cash							37.2	63.2
Cash, cash equivalents, and restricted cash at beginning of period			$ 280.3			$ 184.5	280.3	184.5	184.5
Cash, cash equivalents, and restricted cash at end of period	$ 317.5			$ 247.7			$ 317.5	$ 247.7	$ 280.3

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Treasury Stock	APIC	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	AOCI
Beginning balance (in shares) at Dec. 31, 2018			46,767,164
Beginning balance at Dec. 31, 2018	$ 807.3		$ 0.5	$ (940.3)	$ 539	$ 1,208.1		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5.3					5.3
Loss on interest rate hedge, net of tax	0
Purchase of treasury stock	(13.3)			(13.3)
Issuance of treasury stock	0			5.6	(5.6)
Amounts related to share-based compensation	(4.1)				(4.1)
Share-based compensation expense	2.6				2.6
Ending balance (in shares) at Mar. 31, 2019			46,767,164
Ending balance at Mar. 31, 2019	797.8		$ 0.5	(948)	531.9	1,213.4		0
Beginning balance (in shares) at Dec. 31, 2018			46,767,164
Beginning balance at Dec. 31, 2018	807.3		$ 0.5	(940.3)	539	1,208.1		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	107.2
Ending balance (in shares) at Sep. 30, 2019			46,767,164
Ending balance at Sep. 30, 2019	779		$ 0.5	(1,073.2)	536.4	1,315.3		0
Beginning balance (in shares) at Mar. 31, 2019			46,767,164
Beginning balance at Mar. 31, 2019	797.8		$ 0.5	(948)	531.9	1,213.4		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	32.7					32.7
Loss on interest rate hedge, net of tax	0
Purchase of treasury stock	(16.8)			(16.8)
Issuance of treasury stock	0			0.1	(0.1)
Amounts related to share-based compensation	(0.2)				(0.2)
Share-based compensation expense	2.8				2.8
Ending balance (in shares) at Jun. 30, 2019			46,767,164
Ending balance at Jun. 30, 2019	816.3		$ 0.5	(964.7)	534.4	1,246.1		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	69.2					69.2
Loss on interest rate hedge, net of tax	0
Purchase of treasury stock	(109)			(109)
Issuance of treasury stock	0			0.5	(0.5)
Amounts related to share-based compensation	(0.1)				(0.1)
Share-based compensation expense	2.6				2.6
Ending balance (in shares) at Sep. 30, 2019			46,767,164
Ending balance at Sep. 30, 2019	779		$ 0.5	(1,073.2)	536.4	1,315.3		0
Beginning balance (in shares) at Dec. 31, 2019			46,767,164
Beginning balance at Dec. 31, 2019	803	$ 1.1	$ 0.5	(1,099.8)	538.7	1,362.9	$ 1.1	0.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	89.3					89.3
Loss on interest rate hedge, net of tax	(2.7)							(2.7)
Purchase of treasury stock	(140.6)			(140.6)
Issuance of treasury stock	(0.5)			5.2	(5.7)
Amounts related to share-based compensation	(5.6)				(5.6)
Share-based compensation expense	2.8				2.8
Ending balance (in shares) at Mar. 31, 2020			46,767,164
Ending balance at Mar. 31, 2020	746.8		$ 0.5	(1,235.2)	530.2	1,453.3		(2)
Beginning balance (in shares) at Dec. 31, 2019			46,767,164
Beginning balance at Dec. 31, 2019	803	$ 1.1	$ 0.5	(1,099.8)	538.7	1,362.9	$ 1.1	0.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	325.1
Loss on interest rate hedge, net of tax	0.4							0.4
Ending balance (in shares) at Sep. 30, 2020			46,767,164
Ending balance at Sep. 30, 2020	895.7		$ 0.5	(1,321.8)	530	1,689.1		(2.1)
Beginning balance (in shares) at Mar. 31, 2020			46,767,164
Beginning balance at Mar. 31, 2020	746.8		$ 0.5	(1,235.2)	530.2	1,453.3		(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	168.9					168.9		(0.5)
Loss on interest rate hedge, net of tax	(0.5)							(0.5)
Purchase of treasury stock	0			0
Issuance of treasury stock				0	0
Amounts related to share-based compensation	0				0
Share-based compensation expense	2.8				2.8
Ending balance (in shares) at Jun. 30, 2020			46,767,164
Ending balance at Jun. 30, 2020	918		$ 0.5	(1,235.2)	533	1,622.2		(2.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	66.9					66.9		0.4
Purchase of treasury stock	(89.9)			(89.9)
Issuance of treasury stock	0			3.3	(3.3)
Amounts related to share-based compensation	(5.1)				(5.1)
Share-based compensation expense	5.4				5.4
Ending balance (in shares) at Sep. 30, 2020			46,767,164
Ending balance at Sep. 30, 2020	$ 895.7		$ 0.5	$ (1,321.8)	$ 530	$ 1,689.1		$ (2.1)

Description of Business and Bas

Description of Business and Basis of Presentation	9 Months Ended
	Sep. 30, 2020
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” or the “Company”) markets refined products through a network of retail gasoline stations and to unbranded wholesale customers. Murphy USA’s owned retail stations are almost all located in close proximity to Walmart stores in 25 states and use the brand name Murphy USA®. Murphy USA also markets gasoline and other products at standalone stations under the Murphy Express brand. At September 30, 2020, Murphy USA had a total of 1,488 Company stations of which 1,151 were Murphy USA and 337 were Murphy Express. 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. 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, 2019, 2018 and 2017, 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 18, 2020. Recently Issued Accounting Standards — In March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting". This standard included optional guidance for a limited period of time to help ease the burden in accounting for the effects of reference rate reform. The new standard is effective for all entities through December 31, 2022. The Company does not expect the adoption of this standard to have a material impact on the Company's consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract". This ASU aligns the accounting treatment for capitalizing implementation costs incurred by customers in cloud computing arrangements in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This guidance was effective for the Company on January 1, 2020. The amendments in this update were applied prospectively to all implementation costs incurred after the date of adoption. The Company assessed the effect that this ASU had on our financial position, results of operations, and disclosures and determined that this update did not have a material impact on the Company's consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments." ASU 2016-13 was subsequently modified by ASU 2018-19, ASU 2019-04, ASU 2019-05, and ASU 2019-11. This ASU changes the way entities recognize impairment of many financial assets by requiring immediate recognition of estimated credit losses expected to occur over their remaining life, which will result in timelier recognition of losses. ASU 2016-13 and the associated modifications were effective for the Company on January 1, 2020. ASC 326 requires a modified retrospective approach with an adjustment at the beginning of the year for any adjustment due to its adoption.

Revenues

Revenues	9 Months Ended
	Sep. 30, 2020
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 continues to account for these 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 and nine months ended September 30, 2020 and 2019, respectively: Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 1,867.8 $ — $ 1,867.8 $ 2,660.8 $ — $ 2,660.8 Petroleum product sales (at wholesale) 188.2 — 188.2 304.7 — 304.7 Total petroleum product sales 2,056.0 — 2,056.0 2,965.5 — 2,965.5 Merchandise sales 756.8 — 756.8 681.1 — 681.1 Other operating revenues: RINs 25.2 — 25.2 8.6 — 8.6 Other revenues 2 1.1 (0.1) 1.0 2.4 — 2.4 Total revenues $ 2,839.1 $ (0.1) $ 2,839.0 $ 3,657.6 $ — $ 3,657.6 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes and other miscellaneous items Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 5,558.8 — $ 5,558.8 $ 7,717.7 $ — $ 7,717.7 Petroleum product sales (at wholesale) 566.3 — 566.3 877.3 — 877.3 Total petroleum product sales 6,125.1 — 6,125.1 8,595.0 — 8,595.0 Merchandise sales 2,211.4 — 2,211.4 1,946.1 — 1,946.1 Other operating revenues: RINs 63.3 — 63.3 28.6 — 28.6 Other revenues 2 3.6 — 3.6 4.6 0.1 4.7 Total revenues $ 8,403.4 $ — $ 8,403.4 $ 10,574.3 $ 0.1 $ 10,574.4 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes and 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. The most significant judgment with respect to merchandise sales revenue is determining whether we are the principal or agent for some categories of merchandise such as 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. In June 2018, the Company initiated a loyalty pilot program through a limited number of its retail locations. The customers earn rewards based on their spending or other promotional activities. This program creates a performance obligation which requires us to defer a portion of sales revenue to the loyalty program participants until they redeem their rewards or the rewards expire. The rewards may be redeemed for merchandise or cash discounts on fuel purchases. The program was rolled out chain-wide in March 2019. The deferred revenue balances at September 30, 2020 and December 31, 2019 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	9 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consisted of the following: (Millions of dollars) September 30, December 31, Finished products - First-In, First-Out ("FIFO") basis $ 203.6 $ 259.2 Less: Last-In, First-Out ("LIFO") reserve - finished products (86.3) (160.8) Finished products - LIFO basis 117.3 98.4 Store merchandise for resale 143.9 123.0 Materials and supplies 6.9 6.2 Total inventories $ 268.1 $ 227.6

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: (Millions of dollars) September 30, December 31, 5.625% senior notes due 2027 (net of unamortized discount of $2.5 at September 30, 2020 and $2.7 at December 2019) $ 297.5 $ 297.3 4.75% senior notes due 2029 (net of unamortized discount of $5.6 at September 30, 2020 and $6.1 at December 31, 2019) 494.4 493.9 Term loan due 2023 (effective interest rate of 3.35% at September 30, 2020 and 4.31% at December 31, 2019) 225.0 250.0 Capitalized lease obligations, vehicles, due through 2023 2.1 2.4 Less unamortized debt issuance costs (4.6) (5.5) Total long-term debt 1,014.4 1,038.1 Less current maturities 51.2 38.8 Total long-term debt, net of current $ 963.2 $ 999.3 Senior Notes On April 25, 2017, Murphy Oil USA, Inc., 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 Murphy USA, and are guaranteed by certain 100% owned subsidiaries that guarantee our credit facilities. The indenture governing the 2027 Senior Notes contains restrictive covenants that limit, among other things, the ability of Murphy USA, Murphy Oil USA, Inc. 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, Murphy Oil USA, Inc., 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 the $500 million aggregate principal amount of its senior notes due 2023. The 2029 Senior Notes are fully and unconditionally guaranteed by Murphy USA, and are guaranteed by certain 100% owned 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. The 2027 and 2029 Senior Notes and the 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 2027 and 2029 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. Credit Facilities and Term Loan In August 2019, we amended and extended our existing credit agreement. The maturity date of the agreement was extended to August 2024. The credit agreement provides for a committed $325 million asset-based loan (ABL) facility (with availability subject to the borrowing base described below) and a $250.0 million term loan facility. It also provides for a $150 million uncommitted incremental facility. On August 27, 2019, Murphy Oil USA, Inc. borrowed $200 million under the term loan facility that has a four The borrowing base is, at any time of determination, the amount (net of reserves) equal to the sum of: • 100% of eligible cash at such time, plus • 90% of eligible credit card receivables at such time, plus • 90% of eligible investment grade accounts, plus • 85% of eligible other accounts, plus • 80% of eligible midstream refined products inventory at such time, plus • 75% of eligible retail refined products inventory at such time, plus the lesser of (i) 70% of the average cost of eligible retail merchandise inventory at such time and (ii) 85% of the net orderly liquidation value of eligible retail merchandise inventory at such time. The ABL facility includes a $100 million sublimit for the issuance of letters of credit. Letters of credit issued under the ABL facility reduce availability under the ABL facility. Interest payable on the credit facilities is based on either: • the London interbank offered rate, adjusted for statutory reserve requirements (the “Adjusted LIBO Rate”); or • the Alternate Base Rate, which is defined as the highest of (a) 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 LIBO Rate plus 1.00% per annum, plus, (A) in the case of Adjusted LIBO Rate borrowings, (i) with respect to the ABL facility, spreads ranging from 1.50% to 2.00% per annum depending on a total debt to EBITDA ratio under the ABL facility or (ii) with respect to the term loan facility, spreads ranging from 2.50% to 2.75% per annum depending on a total debt to EBITDA ratio and (B) in the case of Alternate Base Rate borrowings, (i) with respect to the ABL facility, spreads ranging from 0.50% to 1.00% per annum depending on a total debt to EBITDA ratio or (ii) with respect to the term loan facility, spreads ranging from 1.50% to 1.75% per annum depending on a total debt to EBITDA ratio. The interest rate period with respect to the Adjusted LIBO Rate interest rate option can be set at one two three The credit agreement contains certain covenants that limit, among other things, the ability of us and our 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. In addition, the credit agreement requires us to maintain a minimum fixed charge coverage ratio of 1.0 to 1.0 when availability for at least three The credit agreement contains restrictions on certain payments, including dividends, when availability under the credit agreement is less than or equal to the greater of $100 million and 25% of the lesser of the revolving commitments and the borrowing base and our fixed charge coverage ratio is less than 1.0 to 1.0 (unless availability under the credit agreement is greater than $100 million and 40% of the lesser of the revolving commitments and the borrowing base). As of September 30, 2020, our ability to make restricted payments was not limited as our fixed charge coverage ratio was greater than 1.0 to 1.0, at 1.14.

Asset Retirement Obligations (A

Asset Retirement Obligations (ARO)	9 Months Ended
	Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations (ARO)	Asset Retirement Obligations (ARO) The majority of the ARO recognized by the Company at September 30, 2020 and December 31, 2019 is related to the estimated costs to dismantle and abandon certain of its retail gasoline stations. 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) September 30, December 31, Balance at beginning of period $ 32.8 $ 30.7 Accretion expense 1.7 2.1 Settlements of liabilities (0.7) (0.4) Liabilities incurred 0.2 0.4 Balance at end of period $ 34.0 $ 32.8 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	9 Months Ended
	Sep. 30, 2020
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 and nine month periods ended September 30, 2020 and 2019, the Company’s approximate effective tax rates were as follows: 2020 2019 Three months ended September 30, 24.1% 24.2% Nine months ended September 30, 24.1% 23.7% In the nine months ended September 30, 2020, the Company recognized approximately $1.4 million of excess tax benefits related to stock compensation for employees and $1.7 million for other discrete tax items. For the nine months ended September 30, 2019, the Company recognized a tax benefit of approximately $0.9 million of excess tax benefits related to stock compensation. As of September 30, 2020, the earliest year remaining open for federal examination is 2017 and for certain states it ranges from 2014 to 2018. Although the Company believes that recorded liabilities for uncertain tax positions are adequate, additional gains or losses could occur in future periods from resolution of outstanding unsettled matters.

Incentive Plans

Incentive Plans	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Incentive Plans	Incentive Plans 2013 Long-Term Incentive Plan Effective August 30, 2013, certain of our employees participate in the Murphy USA 2013 Long-Term Incentive Plan which was subsequently amended and restated effective as of February 8, 2017 (the “MUSA 2013 Plan”). The MUSA 2013 Plan authorizes 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), 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. 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. In February 2020, the Committee granted nonqualified stock options to certain employees of the Company. The Black-Scholes valuation for these awards was $28.28 per option. Assumptions used to value awards: Dividend yield — % Expected volatility 28.1 % Risk-free interest rate 1.5 % Expected life (years) 4.7 Stock price at valuation date $ 106.72 Changes in options outstanding for Company employees during the period from December 31, 2019 to September 30, 2020 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 12/31/2019 392,300 $ 68.52 Granted 79,200 105.57 Exercised (148,800) 64.21 Outstanding at 9/30/2020 322,700 $ 79.60 4.9 $ 15.7 Exercisable at 9/30/2020 110,700 $ 66.91 3.5 $ 6.8 RESTRICTED STOCK UNITS (MUSA 2013 Plan) – 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 2013 Plan, are valued at the grant date fair value, and vest over 3 years. Changes in restricted stock units outstanding for Company employees during the period from December 31, 2019 to September 30, 2020 are presented in the following table: Employee RSUs Number of units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at 12/31/2019 198,915 $ 70.58 Granted 55,395 $ 90.64 Vested and issued (59,324) $ 66.31 $ 6.4 Forfeited (8,680) $ 78.06 Outstanding at 9/30/2020 186,306 $ 77.56 $ 23.9 PERFORMANCE-BASED RESTRICTED STOCK UNITS (MUSA 2013 Plan) – In February 2020, the Committee awarded performance-based restricted stock units (performance units) to certain employees. Half of the performance units vest based on a 3-year return on average capital employed (ROACE) calculation and the other half vest based on a 3-year total shareholder return (TSR) calculation that compares MUSA to a group of 18 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 $142.07 per unit. For the ROACE portion of the awards, the valuation will be based on the grant date fair value of $106.72 per unit and the number of awards will be periodically assessed to determine the probability of vesting. Changes in performance-based restricted stock units outstanding for Company employees during the period from December 31, 2019 to September 30, 2020 are presented in the following table: Employee PSU's Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at 12/31/2019 131,200 $ 82.98 Granted 64,050 $ 123.65 Vested and issued (65,745) $ 85.04 $ 7.0 Forfeited (405) $ 65.75 Outstanding at 9/30/2020 129,100 $ 97.19 $ 16.6 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 “Directors Plan”). The directors for Murphy USA are compensated with a mixture of cash payments and equity-based awards. Awards under the Directors Plan may be in the form of restricted stock, restricted stock units, stock options, or a combination thereof. An aggregate of 500,000 shares of common stock shall be available for issuance of grants under the Directors Plan. RESTRICTED STOCK UNITS (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. These awards typically vest at the end of three years. Changes in restricted stock units outstanding for Company non-employee directors during the period from December 31, 2019 to September 30, 2020 are presented in the following table: Director RSU's Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at 12/31/2019 33,607 $ 70.68 Granted 9,744 $ 105.33 Vested and issued (12,404) $ 66.01 $ 1.3 Outstanding at 9/30/2020 30,947 $ 83.46 $ 4.0

Financial Instruments and Risk

Financial Instruments and Risk Management	9 Months Ended
	Sep. 30, 2020
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 Statement 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 occur. As of September 30, 2020, all current commodity derivative activity is immaterial. At September 30, 2020 there was no cash deposit and at December 31, 2019 the cash deposit was $1.0 million 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 September 30, 2020 or December 31, 2019. Interest Rate Risks

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2020
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 July 24, 2019, the Board of Directors approved an up to $400 million share repurchase program to be executed over the two The following table provides a reconciliation of basic and diluted earnings per share computations for the three and nine months ended September 30, 2020 and 2019: Three Months Ended Nine Months Ended (Millions of dollars, except share and per share amounts) 2020 2019 2020 2019 Earnings per common share: Net income per share - basic Net income attributable to common stockholders $ 66.9 $ 69.2 $ 325.1 $ 107.2 Weighted average common shares outstanding (in thousands) 29,111 31,447 29,546 31,961 Earnings per common share $ 2.30 $ 2.20 $ 11.00 $ 3.35 Earnings per common share - assuming dilution: Net income per share - diluted Net income attributable to common stockholders $ 66.9 $ 69.2 $ 325.1 $ 107.2 Weighted average common shares outstanding (in thousands) 29,111 31,447 29,546 31,961 Common equivalent shares: Dilutive share-based awards 388 257 341 228 Weighted average common shares outstanding - assuming dilution (in thousands) 29,499 31,704 29,887 32,189 Earnings per common share assuming dilution $ 2.27 $ 2.18 $ 10.88 $ 3.33 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. For the reported periods, the number of time-based restricted stock units, performance based units and non-qualified stock options that are excluded due to their anti-dilutive nature is immaterial.

Other Financial Information

Other Financial Information	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Financial Information	Other Financial Information CASH FLOW DISCLOSURES — Cash income taxes paid, net of refunds, were $66.5 million and $16.2 million for the nine month periods ended September 30, 2020 and 2019, respectively. Interest paid, net of amounts capitalized, was $39.0 million and $46.0 million for the nine month periods ended September 30, 2020 and 2019, respectively. CHANGES IN WORKING CAPITAL: Nine Months Ended (Millions of dollars) 2020 2019 Accounts receivable $ 31.0 $ (25.4) Inventories (40.6) (12.3) Prepaid expenses and other current assets 15.3 6.8 Accounts payable and accrued liabilities (27.3) 27.2 Income taxes payable 19.4 — Net (increase) decrease in noncash operating working capital $ (2.2) $ (3.7)

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Assets and Liabilities Measure 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. At the balance sheet date, the fair value of derivative contracts was determined using NYMEX quoted values but was immaterial. The following table presents the carrying amounts and estimated fair values of financial instruments held by the Company at September 30, 2020 and December 31, 2019. 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 excludes Cash and cash equivalents, Accounts receivable-trade, Restricted cash, 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. At September 30, 2020 At December 31, 2019 Carrying Carrying (Millions of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt $ (1,014.4) $ (1,043.5) $ (1,038.1) $ (1,069.4)

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2020
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. The Company believes costs related to these sites will not have a material adverse effect on Murphy USA’s net income, financial condition or liquidity in a future period. Certain environmental expenditures are likely to be recovered by the Company from other sources, primarily environmental funds maintained by certain states. Since no assurance can be given that future recoveries from other sources will occur, the Company has not recorded a benefit for likely recoveries at September 30, 2020, 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. 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 September 30, 2020. 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. 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. Other than as noted above, Murphy USA is engaged in a number of other legal proceedings, all of which the Company considers routine and incidental to its business. Based on information currently available to the Company, the ultimate resolution of those 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 September 30, 2020, 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 $26.7 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.

Lease Accounting

Lease Accounting	9 Months Ended
	Sep. 30, 2020
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 approximately 1 year to 20 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 station 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 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 222 stations, one terminal, a hangar and various equipment. Our lease agreements do not contain any material residual value guarantees and approximately 102 sites leased from Walmart 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 September 30, December 31, Assets Operating (Right-of-use) Other Assets $ 146.3 $ 124.2 Finance Property, plant, and equipment, at cost, less accumulated depreciation of $2.7 at September 30, 2020 and $2.2 at December 31, 2019 2.6 3.0 Total leased assets $ 148.9 $ 127.2 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 7.7 $ 6.8 Finance Current maturities of long-term debt 1.2 1.2 Noncurrent Operating Deferred credits and other liabilities 140.7 118.5 Finance Long-term debt, including capitalized lease obligations 0.9 1.2 Total lease liabilities $ 150.5 $ 127.7 Lease Cost: Three Months Ended Nine Months Ended (Millions of dollars) Classification 2020 2019 2020 2019 Operating lease cost Station and other operating expenses $ 4.4 $ 3.7 $ 12.4 $ 10.8 Finance lease cost Amortization of leased assets Depreciation & amortization expense 0.3 0.3 1.0 0.9 Interest on lease liabilities Interest expense — — 0.1 0.1 Net lease costs $ 4.7 $ 4.0 $ 13.5 $ 11.8 Cash flow information: Nine Months Ended (Millions of dollars) 2020 2019 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 11.4 $ 10.2 Operating cash flows from finance leases $ 0.1 $ 0.1 Financing cash flows from finance leases $ 1.1 $ 1.1 Maturity of Lease Liabilities at September 30, 2020: (Millions of dollars) Operating leases Finance leases 2020 $ 4.1 $ 0.4 2021 16.5 1.1 2022 15.6 0.6 2023 15.1 0.1 2024 14.6 — After 2024 176.7 — Total lease payments 242.6 2.2 less: interest 94.2 0.1 Present value of lease liabilities $ 148.4 $ 2.1 Lease Term and Discount Rate: Nine Months Ended 2020 Weighted average remaining lease term (years) Finance leases 1.9 Operating leases 15.8 Weighted average discount rate Finance leases 4.6 % Operating leases 5.8 %
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 approximately 1 year to 20 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 station 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 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 222 stations, one terminal, a hangar and various equipment. Our lease agreements do not contain any material residual value guarantees and approximately 102 sites leased from Walmart 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 September 30, December 31, Assets Operating (Right-of-use) Other Assets $ 146.3 $ 124.2 Finance Property, plant, and equipment, at cost, less accumulated depreciation of $2.7 at September 30, 2020 and $2.2 at December 31, 2019 2.6 3.0 Total leased assets $ 148.9 $ 127.2 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 7.7 $ 6.8 Finance Current maturities of long-term debt 1.2 1.2 Noncurrent Operating Deferred credits and other liabilities 140.7 118.5 Finance Long-term debt, including capitalized lease obligations 0.9 1.2 Total lease liabilities $ 150.5 $ 127.7 Lease Cost: Three Months Ended Nine Months Ended (Millions of dollars) Classification 2020 2019 2020 2019 Operating lease cost Station and other operating expenses $ 4.4 $ 3.7 $ 12.4 $ 10.8 Finance lease cost Amortization of leased assets Depreciation & amortization expense 0.3 0.3 1.0 0.9 Interest on lease liabilities Interest expense — — 0.1 0.1 Net lease costs $ 4.7 $ 4.0 $ 13.5 $ 11.8 Cash flow information: Nine Months Ended (Millions of dollars) 2020 2019 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 11.4 $ 10.2 Operating cash flows from finance leases $ 0.1 $ 0.1 Financing cash flows from finance leases $ 1.1 $ 1.1 Maturity of Lease Liabilities at September 30, 2020: (Millions of dollars) Operating leases Finance leases 2020 $ 4.1 $ 0.4 2021 16.5 1.1 2022 15.6 0.6 2023 15.1 0.1 2024 14.6 — After 2024 176.7 — Total lease payments 242.6 2.2 less: interest 94.2 0.1 Present value of lease liabilities $ 148.4 $ 2.1 Lease Term and Discount Rate: Nine Months Ended 2020 Weighted average remaining lease term (years) Finance leases 1.9 Operating leases 15.8 Weighted average discount rate Finance leases 4.6 % Operating leases 5.8 %

Business Segment

Business Segment	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Business Segment	Business Segment The Company's operations have one reportable segment which is Marketing. The 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 ("PS&W") group. As the primary purpose of the PS&W 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 performed by these groups. As such, they are all treated as one segment for reporting purposes as they sell the same products. This Marketing segment contains essentially all of the revenue generating functions of the Company. Results not included in the reportable segment include Corporate and Other Assets. Net settlement proceeds from litigation are included in Corporate and other assets operating income. The reportable segment was determined based on information reviewed by the Chief Operating Decision Maker (CODM). Three Months Ended September 30, 2020 September 30, 2019 Total Assets at External Revenues Income (Loss) External Revenues Income (Loss) (Millions of dollars) September 30, 2020 Marketing $ 2,358.1 $ 2,839.1 $ 81.7 $ 3,657.6 $ 94.0 Corporate and other assets 430.1 (0.1) (14.8) — (24.8) Total $ 2,788.2 $ 2,839.0 $ 66.9 $ 3,657.6 $ 69.2 Nine Months Ended September 30, 2020 September 30, 2019 External Revenues Income (Loss) External Revenues Income (Loss) (Millions of dollars) Marketing $ 8,403.4 $ 362.2 $ 10,574.3 $ 154.7 Corporate and other assets — (37.1) 0.1 (47.5) Total $ 8,403.4 $ 325.1 $ 10,574.4 $ 107.2

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsOn October 28, 2020, Murphy USA Inc. issued a news release announcing an updated capital allocation strategy for the Company including a new $500 million share repurchase program to begin upon completion of the current $400 million authorization and available to be executed by December 31, 2023, and the institution of a quarterly dividend to common stockholders. The dividend of $0.25 per share, or $1.00 per share on an annualized basis, will be paid on December 1, 2020, to shareholders of record as of November 13, 2020.

Guarantor Subsidiaries

Guarantor Subsidiaries	9 Months Ended
	Sep. 30, 2020
Guarantor Subsidiaries [Abstract]
Guarantor Subsidiaries	Guarantor Subsidiaries Murphy USA Inc. ("Parent Company") and certain of the Company’s 100% owned, domestic subsidiaries (the “Guarantor Subsidiaries”) fully and unconditionally guarantee, on a joint and several basis, certain of the outstanding indebtedness of Murphy Oil USA, Inc. (the "Issuer"), including the 5.625% senior notes due 2027 and the 4.75% senior notes due 2029. The following consolidating schedules present financial information on a consolidated basis in conformity with the SEC’s Regulation S-X Rule 3-10(d): CONSOLIDATING BALANCE SHEET (Millions of dollars, except share amounts) September 30, 2020 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 315.8 $ 1.7 $ — $ — $ 317.5 Accounts receivable—trade, less allowance for doubtful accounts of $0.1 in 2020 — 142.6 0.1 — — 142.7 Inventories, at lower of cost or market — 268.1 — — — 268.1 Prepaid expenses and other current assets — 14.8 0.1 — — 14.9 Total current assets — 741.3 1.9 — — 743.2 Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,151.3 in 2020 — 1,842.8 11.2 — — 1,854.0 Investments in subsidiaries 2,916.9 143.4 — — (3,060.3) — Other assets — 191.0 — — — 191.0 Total assets $ 2,916.9 $ 2,918.5 $ 13.1 $ — $ (3,060.3) $ 2,788.2 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 51.2 $ — $ — $ — $ 51.2 Inter-company accounts payable 230.9 (39.2) (37.4) (154.3) — — Trade accounts payable and accrued liabilities — 442.5 0.3 — — 442.8 Income taxes payable — 19.8 (0.4) — — 19.4 Total current liabilities 230.9 474.3 (37.5) (154.3) — 513.4 Long-term debt, including capitalized lease obligations — 963.2 — — — 963.2 Deferred income taxes — 217.5 — — — 217.5 Asset retirement obligations — 34.0 — — — 34.0 Deferred credits and other liabilities — 164.4 — — — 164.4 Total liabilities 230.9 1,853.4 (37.5) (154.3) — 1,892.5 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par 0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2020) 0.5 — 0.1 — (0.1) 0.5 Treasury Stock (18,199,448 shares held at September 30, 2020) (1,321.8) — — — — (1,321.8) Additional paid in capital (APIC) 1,179.8 579.1 52.0 87.5 (1,368.4) 530.0 Retained earnings 2,827.5 488.1 (1.5) 66.8 (1,691.8) 1,689.1 Accumulated other comprehensive income (loss) (AOCI) — (2.1) — — — (2.1) Total stockholders' equity 2,686.0 1,065.1 50.6 154.3 (3,060.3) 895.7 Total liabilities and stockholders' equity $ 2,916.9 $ 2,918.5 $ 13.1 $ — $ (3,060.3) $ 2,788.2 CONSOLIDATING BALANCE SHEET (Millions of dollars, except share amounts) December 31, 2019 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 279.4 $ 0.9 $ — $ — $ 280.3 Accounts receivable—trade, less allowance for doubtful accounts of $1.2 in 2019 — 173.0 (0.1) — — 172.9 Inventories, at lower of cost or market — 227.6 — — — 227.6 Prepaid expenses and other current assets — 29.6 0.4 — — 30.0 Total current assets — 709.6 1.2 — — 710.8 Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,079.2 in 2019 — 1,799.1 8.2 — — 1,807.3 Investments in subsidiaries 2,591.8 143.9 — — (2,735.7) — Other assets — 169.1 — — — 169.1 Total assets $ 2,591.8 $ 2,821.7 $ 9.4 $ — $ (2,735.7) $ 2,687.2 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 38.8 $ — $ — $ — $ 38.8 Inter-company accounts payable (0.1) 196.1 (41.7) (154.3) — — Trade accounts payable and accrued liabilities — 466.2 — — — 466.2 Total current liabilities (0.1) 701.1 (41.7) (154.3) — 505.0 Long-term debt, including capitalized lease obligations — 999.3 — — — 999.3 Deferred income taxes — 216.7 — — — 216.7 Asset retirement obligations — 32.8 — — — 32.8 Deferred credits and other liabilities — 130.4 — — — 130.4 Total liabilities (0.1) 2,080.3 (41.7) (154.3) — 1,884.2 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at December 31, 2019) 0.5 — 0.1 — (0.1) 0.5 Treasury Stock (16,307,048 shares held at December 31, 2019 ) (1,099.8) — — — — (1,099.8) Additional paid in capital (APIC) 1,188.8 578.8 52.0 87.5 (1,368.4) 538.7 Retained earnings 2,502.4 161.9 (1.0) 66.8 (1,367.2) 1,362.9 Accumulated other comprehensive income (AOCI) — 0.7 — — — 0.7 Total stockholders' equity 2,591.9 741.4 51.1 154.3 (2,735.7) 803.0 Total liabilities and stockholders' equity $ 2,591.8 $ 2,821.7 $ 9.4 $ — $ (2,735.7) $ 2,687.2 CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Three Months Ended September 30, 2020 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,056.0 $ — $ — $ — $ 2,056.0 Merchandise sales — 756.8 — — — 756.8 Other operating revenues — 26.1 0.1 — — 26.2 Total operating revenues — 2,838.9 0.1 — — 2,839.0 Operating Expenses Petroleum product cost of goods sold — 1,862.2 — — — 1,862.2 Merchandise cost of goods sold — 638.7 — — — 638.7 Station and other operating expenses — 142.8 0.1 — — 142.9 Depreciation and amortization — 40.5 0.1 — — 40.6 Selling, general and administrative — 53.7 — — — 53.7 Accretion of asset retirement obligations — 0.6 — — — 0.6 Total operating expenses — 2,738.5 0.2 — — 2,738.7 Net settlement proceeds — — — — — — Gain (loss) on sale of assets — — — — — — Income (loss) from operations — 100.4 (0.1) — — 100.3 Other income (expense) Interest income — — — — — — Interest expense — (12.4) — — — (12.4) Other nonoperating income — 0.4 (0.2) — — 0.2 Total other income (expense) — (12.0) (0.2) — — (12.2) Income (loss) before income taxes — 88.4 (0.3) — — 88.1 Income tax expense — 21.3 (0.1) — — 21.2 Income (loss) — 67.1 (0.2) — — 66.9 Equity earnings in affiliates, net of tax 66.9 (0.2) — — (66.7) — Net Income (Loss) 66.9 66.9 (0.2) — (66.7) 66.9 Other comprehensive loss — 0.4 — — — 0.4 Comprehensive income (loss) $ 66.9 $ 67.3 $ (0.2) $ — $ (66.7) $ 67.3 CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Three Months Ended September 30, 2019 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,965.5 $ — $ — $ — $ 2,965.5 Merchandise sales — 681.1 — — — 681.1 Other operating revenues — 11.0 — — — 11.0 Total operating revenues — 3,657.6 — — — 3,657.6 Operating Expenses Petroleum product cost of goods sold — 2,749.6 — — — 2,749.6 Merchandise cost of goods sold — 569.9 — — — 569.9 Station and other operating expenses — 143.4 — — — 143.4 Depreciation and amortization — 37.6 — — — 37.6 Selling, general and administrative — 36.0 — — — 36.0 Accretion of asset retirement obligations — 0.6 — — — 0.6 Total operating expenses — 3,537.1 — — — 3,537.1 Net settlement proceeds — — — — — — Gain (loss) on sale of assets — 0.2 — — — 0.2 Income (loss) from operations — 120.7 — — — 120.7 Other income (expense) Interest income — 0.8 — — — 0.8 Interest expense — (15.3) — — — (15.3) Loss on early debt extinguishment — (14.8) — — — (14.8) Other nonoperating income — — (0.1) — — (0.1) Total other income (expense) — (29.3) (0.1) — — (29.4) Income (loss) before income taxes — 91.4 (0.1) — — 91.3 Income tax expense — 22.1 — — — 22.1 Income (loss) — 69.3 (0.1) — — 69.2 Equity earnings in affiliates, net of tax 69.2 (0.1) — — (69.1) — Net Income (Loss) 69.2 69.2 (0.1) — (69.1) 69.2 Other comprehensive income (loss) — — — — — — Comprehensive income (loss) $ 69.2 $ 69.2 $ (0.1) $ — $ (69.1) $ 69.2 CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Nine Months Ended September 30, 2020 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 6,125.1 $ — $ — $ — $ 6,125.1 Merchandise sales — 2,211.4 — — — 2,211.4 Other operating revenues — 66.8 0.1 — — 66.9 Total operating revenues — 8,403.3 0.1 — — 8,403.4 Operating Expenses Petroleum product cost of goods sold — 5,409.8 — — — 5,409.8 Merchandise cost of goods sold — 1,867.4 — — — 1,867.4 Station and other operating expenses — 409.7 0.1 — — 409.8 Depreciation and amortization — 119.3 0.2 — — 119.5 Selling, general and administrative — 130.0 — — — 130.0 Accretion of asset retirement obligations — 1.7 — — — 1.7 Total operating expenses — 7,937.9 0.3 — — 7,938.2 Gain (loss) on sale of assets — 1.4 — — — 1.4 Income (loss) from operations — 466.8 (0.2) — — 466.6 Other income (expense) Interest income — 1.0 — — — 1.0 Interest expense — (38.7) — — — (38.7) Loss on early debt extinguishment — — — — — — Other nonoperating income — — (0.5) — — (0.5) Total other income (expense) — (37.7) (0.5) — — (38.2) Income (loss) before income taxes — 429.1 (0.7) — — 428.4 Income tax expense — 103.5 (0.2) — — 103.3 Income (loss) — 325.6 (0.5) — — 325.1 Equity earnings in affiliates, net of tax 325.1 (0.5) — — (324.6) — Net Income (Loss) 325.1 325.1 (0.5) — (324.6) 325.1 Other comprehensive income (loss) — (2.8) — — — (2.8) Comprehensive income (loss) $ 325.1 $ 322.3 $ (0.5) $ — $ (324.6) $ 322.3 CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Nine Months Ended September 30, 2019 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 8,595.0 $ — $ — $ — $ 8,595.0 Merchandise sales — 1,946.1 — — — 1,946.1 Other operating revenues — 33.3 — — — 33.3 Total operating revenues — 10,574.4 — — — 10,574.4 Operating Expenses Petroleum product cost of goods sold — 8,104.8 — — — 8,104.8 Merchandise cost of goods sold — 1,631.9 — — — 1,631.9 Station and other operating expenses — 421.8 — — — 421.8 Depreciation and amortization — 113.8 — — — 113.8 Selling, general and administrative — 105.7 — — — 105.7 Accretion of asset retirement obligations — 1.6 — — — 1.6 Total operating expenses — 10,379.6 — — — 10,379.6 Net settlement proceeds — 0.1 — — — 0.1 Gain (loss) on sale of assets — 0.1 — — — 0.1 Income (loss) from operations — 195.0 — — — 195.0 Other income (expense) Interest income — 2.4 — — — 2.4 Interest expense — (42.1) — — — (42.1) Loss on early debt extinguishment — (14.8) — — — (14.8) Other nonoperating income — 0.5 (0.5) — — — Total other income (expense) — (54.0) (0.5) — — (54.5) Income (loss) before income taxes — 141.0 (0.5) — — 140.5 Income tax expense — 33.4 (0.1) — — 33.3 Income (loss) — 107.6 (0.4) — — 107.2 Equity earnings in affiliates, net of tax 107.2 (0.4) — — (106.8) — Net Income (Loss) 107.2 107.2 (0.4) — (106.8) 107.2 Other comprehensive income (loss) — — — — — — Comprehensive income (loss) $ 107.2 $ 107.2 $ (0.4) $ — $ (106.8) $ 107.2 CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Nine Months Ended September 30, 2020 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 325.1 $ 325.1 $ (0.5) $ — $ (324.6) $ 325.1 Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities Depreciation and amortization — 119.3 0.2 — — 119.5 Deferred and noncurrent income tax charges (credits) — 1.7 — — — 1.7 Accretion of asset retirement obligations — 1.7 — — — 1.7 (Gain) loss on sale of assets — (1.4) — — — (1.4) Net (increase) decrease in noncash operating working capital — (2.1) (0.1) — — (2.2) Equity in earnings of affiliates (325.1) 0.5 — — 324.6 — Other operating activities - net — 23.4 — — — 23.4 Net cash provided by (required by) operating activities — 468.2 (0.4) — — 467.8 Investing Activities Property additions — (166.2) (3.2) — — (169.4) Proceeds from sale of assets — 7.7 — — — 7.7 Other investing activities - net — (1.6) — — — (1.6) Net cash provided by (required by) investing activities — (160.1) (3.2) — — (163.3) Financing Activities Purchase of treasury stock (230.5) — — — — (230.5) Borrowings of debt — — — — — — Repayments of debt — (26.1) — — — (26.1) Amounts related to share-based compensation — (10.7) — — — (10.7) Net distributions to parent 230.5 (234.9) 4.4 — — — Net cash provided by (required by) financing activities — (271.7) 4.4 — — (267.3) Net increase (decrease) in cash and cash equivalents — 36.4 0.8 — — 37.2 Cash, cash equivalents, and restricted cash at January 1 — 279.4 0.9 — — 280.3 Cash, cash equivalents, and restricted cash at September 30 $ — $ 315.8 $ 1.7 $ — $ — $ 317.5 CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Nine Months Ended September 30, 2019 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 107.2 $ 107.2 $ (0.4) $ — $ (106.8) $ 107.2 Adjustments to reconcile net income (loss) to net cash provided by (required by)operating activities Depreciation and amortization — 113.8 — — — 113.8 Deferred and noncurrent income tax charges (credits) — 6.9 — — — 6.9 Accretion of asset retirement obligations — 1.6 — — — 1.6 Pretax (gains) losses from sale of assets — (0.1) — — — (0.1) Net (increase) decrease in noncash operating working capital — (3.6) (0.1) — — (3.7) Equity in earnings of affiliates (107.2) 0.4 — — 106.8 — Loss on early debt extinguishment — 14.8 — — — 14.8 Other operating activities - net — 11.1 — — — 11.1 Net cash provided by (required by) operating activities — 252.1 (0.5) — — 251.6 Investing Activities Property additions — (149.3) (4.4) — — (153.7) Proceeds from sale of assets — 2.4 — — — 2.4 Other investing activities - net — (0.7) — — — (0.7) Net cash provided by (required by) investing activities — (147.6) (4.4) — — (152.0) Financing Activities Purchase of treasury stock (139.1) — — — — (139.1) Borrowings of debt — 693.7 — — — 693.7 Repayments of debt — (573.1) — — — (573.1) Debt issuance costs — (3.1) — — — (3.1) Early debt extinguishment costs — (10.4) — — — (10.4) Amounts related to share-based compensation — (4.4) — — — (4.4) Net distributions to parent 139.1 (144.3) 5.2 — — — Net cash provided by (required) by financing activities — (41.6) 5.2 — — (36.4) Net increase (decrease) in cash and cash equivalents — 62.9 0.3 — — 63.2 Cash, cash equivalents, and restricted cash at January 1 — 184.0 0.5 — — 184.5 Cash, cash equivalents, and restricted cash at September 30 $ — $ 246.9 $ 0.8 $ — $ — $ 247.7 CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Nine Months Ended September 30, 2020 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2019 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Issuance of common stock — — — — — — Balance as of March 31, 2020 0.5 — 0.1 — (0.1) 0.5 Issuance of common stock — — — — — — Balance as of June 30, 2020 0.5 — 0.1 — (0.1) 0.5 Issuance of common stock — — — — — — Balance as of September 30, 2020 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Treasury Stock Balance as of December 31, 2019 $ (1,099.8) $ — $ — $ — $ — $ (1,099.8) Issuance of treasury stock 5.2 — — — — 5.2 Repurchase of treasury stock (140.6) — — — — (140.6) Balance as of March 31, 2020 (1,235.2) — — — — (1,235.2) Issuance of treasury stock — — — — — — Repurchase of treasury stock — — — — — — Balance as of June 30, 2020 (1,235.2) — — — — (1,235.2) Issuance of treasury stock 3.3 — — — — 3.3 Repurchase of treasury stock (89.9) — — — — (89.9) Balance as of September 30, 2020 $ (1,321.8) $ — $ — $ — $ — $ (1,321.8) APIC Balance as of December 31, 2019 $ 1,188.8 $ 578.8 $ 52.0 $ 87.5 $ (1,368.4) $ 538.7 Issuance of treasury stock (5.7) — — — — (5.7) Amounts related to share-based compensation — (5.6) — — — (5.6) Share-based compensation expense — 2.8 — — — 2.8 Balance as of March 31, 2020 1,183.1 576.0 52.0 87.5 (1,368.4) 530.2 Issuance of treasury stock — — — — — — Amounts related to share-based compensation — — — — — — Share-based compensation expense — 2.8 — — — 2.8 Balance as of June 30, 2020 1,183.1 578.8 52.0 87.5 (1,368.4) 533.0 Issuance of treasury stock (3.3) — — — — (3.3) Amounts related to share-based compensation — (5.1) — — — (5.1) Share-based compensation expense — 5.4 — — — 5.4 Balance as of September 30, 2020 $ 1,179.8 $ 579.1 $ 52.0 $ 87.5 $ (1,368.4) $ 530.0 (Millions of dollars) Nine Months Ended September 30, 2020 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Retained Earnings Balance as of December 31, 2019 $ 2,502.4 $ 161.9 $ (1.0) $ 66.8 $ (1,367.2) $ 1,362.9 Cumulative effect of a change in accounting principle — 1.1 — — — 1.1 Net income (loss) 89.3 89.3 (0.1) — (89.2) 89.3 Balance as of March 31, 2020 2,591.7 252.3 (1.1) 66.8 (1,456.4) 1,453.3 Net income (loss) 168.9 168.9 (0.2) — (168.7) 168.9 Balance as of June 30, 2020 2,760.6 421.2 (1.3) 66.8 (1,625.1) 1,622.2 Net income (loss) 66.9 66.9 (0.2) — (66.7) 66.9 Balance as of September 30, 2020 $ 2,827.5 $ 488.1 $ (1.5) $ 66.8 $ (1,691.8) $ 1,689.1 AOCI Balance as of December 31, 2019 $ — $ 0.7 $ — $ — $ — $ 0.7 Other comprehensive income (loss) — (2.7) — — — (2.7) Balance as of March 31, 2020 — (2.0) — — — (2.0) Net income (loss) — (0.5) — — — (0.5) Balance as of June 30, 2020 — (2.5) — — — (2.5) Net income (loss) — 0.4 — — — 0.4 Balance as of September 30, 2020 $ — $ (2.1) $ — $ — $ — $ (2.1) CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Nine Months Ended September 30, 2019 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2018 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Issuance of common stock — — — — — — Balance as of March 31, 2019 0.5 — 0.1 — (0.1) $ 0.5 Issuance of common stock — — — — — — Balance as of June 30, 2019 0.5 — 0.1 — (0.1) 0.5 Issuance of common stock — — — — — — Balance as of September 30, 2019 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Treasury Stock Balance as of December 31, 2018 $ (940.3) $ — $ — $ — $ — $ (940.3) Issuance of treasury stock 5.6 — — — — 5.6 Repurchase of treasury stock (13.3) — — — — (13.3) Balance as of March 31, 2019 (948.0) — — — — (948.0) Issuance of treasury stock 0.1 — — — — 0.1 Repurchase of treasury stock (16.8) — — — — (16.8) Balance as of June 30, 2019 (964.7) — — — — (964.7) Issuance of treasury stock 0.5 — — — — 0.5 Repurchase of treasury stock (109.0) — — — — (109.0) Balance as of September 30, 2019 $ (1,073.2) $ — $ — $ — $ — $ (1,073.2) APIC Balance as of December 31, 2018 $ 1,195.1 $ 572.8 $ 52.0 $ 87.5 $ (1,368.4) $ 539.0 Issuance of treasury stock (5.6) — — — — (5.6) Amounts related to share-based compensation — (4.1) — — — (4.1) Share-based compensation expense — 2.6 — — — 2.6 Balance as of March 31, 2019 1,189.5 571.3 52.0 87.5 (1,368.4) $ 531.9 Issuance of treasury stock (0.1) — — — — (0.1) Amounts related to share-based compensation — (0.2) — — — (0.2) Share-based compensation expense — 2.8 — — — 2.8 Balance as of June 30, 2019 1,189.4 573.9 52.0 87.5 (1,368.4) 534.4 Issuance of treasury stock (0.5) (0.5) Amounts related to share-based compensation — (0.1) — — — (0.1) Share-based compensation expense — 2.6 — — — 2.6 Balance as of September 30, 2019 $ 1,188.9 $ 576.4 $ 52.0 $ 87.5 $ (1,368.4) $ 536.4 (Millions of dollars) Nine Months Ended September 30, 2019 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Retained Earnings Balance as of December 31, 2018 $ 2,181.8 $ 172.9 $ (0.5) $ 66.8 $ (1,212.9) $ 1,208.1 Net income (loss) 5.3 5.3 (0.2) — (5.1) 5.3 Balance as of March 31, 2019 2,187.1 178.2 (0.7) 66.8 (1,218.0) 1,213.4 Net income (loss) 32.7 32.7 (0.1) — (32.6) 32.7 Balance as of June 30, 2019 2,219.8 210.9 (0.8) 66.8 (1,250.6) 1,246.1 Net income (loss) 69.2 69.2 (0.1) — (69.1) 69.2 Balance as of September 30, 2019 $ 2,289.0 $ 280.1 $ (0.9) $ 66.8 $ (1,319.7) $ 1,315.3 AOCI Balance as of December 31, 2018 $ — $ — $ — $ — $ — $ — Other comprehensive income (loss) — — — — — — Balance as of March 31, 2019 — — — — — — Other comprehensive income (loss) — — — — — — Balance as of June 30, 2019 — — — — — — Other comprehensive income (loss) — — — — — — Balance as of September 30, 2019 $ — $ — $ — $ — $ — $ —

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	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. 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 March 2020, the FASB issued ASU 2020-04, "Reference Rate Reform (Topic 848) - Facilitation of the Effects of Reference Rate Reform on Financial Reporting". This standard included optional guidance for a limited period of time to help ease the burden in accounting for the effects of reference rate reform. The new standard is effective for all entities through December 31, 2022. The Company does not expect the adoption of this standard to have a material impact on the Company's consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, "Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract". This ASU aligns the accounting treatment for capitalizing implementation costs incurred by customers in cloud computing arrangements in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This guidance was effective for the Company on January 1, 2020. The amendments in this update were applied prospectively to all implementation costs incurred after the date of adoption. The Company assessed the effect that this ASU had on our financial position, results of operations, and disclosures and determined that this update did not have a material impact on the Company's consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments." ASU 2016-13 was subsequently modified by ASU 2018-19, ASU 2019-04, ASU 2019-05, and ASU 2019-11. This ASU changes the way entities recognize impairment of many financial assets by requiring immediate recognition of estimated credit losses expected to occur over their remaining life, which will result in timelier recognition of losses. ASU 2016-13 and the associated modifications were effective for the Company on January 1, 2020. ASC 326 requires a modified retrospective approach with an adjustment at the beginning of the year for any adjustment due to its adoption.
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 continues to account for these transactions as non-monetary exchanges under existing accounting guidance and typically reports these on a net basis in the Consolidated Statements of Income. 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. The most significant judgment with respect to merchandise sales revenue is determining whether we are the principal or agent for some categories of merchandise such as 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. In June 2018, the Company initiated a loyalty pilot program through a limited number of its retail locations. The customers earn rewards based on their spending or other promotional activities. This program creates a performance obligation which requires us to defer a portion of sales revenue to the loyalty program participants until they redeem their rewards or the rewards expire. The rewards may be redeemed for merchandise or cash discounts on fuel purchases. The program was rolled out chain-wide in March 2019. The deferred revenue balances at September 30, 2020 and December 31, 2019 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.
Lease Accounting	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.

Revenues (Tables)

Revenues (Tables)	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables disaggregate our revenues by major source for the three and nine months ended September 30, 2020 and 2019, respectively: Three Months Ended September 30, 2020 Three Months Ended September 30, 2019 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 1,867.8 $ — $ 1,867.8 $ 2,660.8 $ — $ 2,660.8 Petroleum product sales (at wholesale) 188.2 — 188.2 304.7 — 304.7 Total petroleum product sales 2,056.0 — 2,056.0 2,965.5 — 2,965.5 Merchandise sales 756.8 — 756.8 681.1 — 681.1 Other operating revenues: RINs 25.2 — 25.2 8.6 — 8.6 Other revenues 2 1.1 (0.1) 1.0 2.4 — 2.4 Total revenues $ 2,839.1 $ (0.1) $ 2,839.0 $ 3,657.6 $ — $ 3,657.6 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes and other miscellaneous items Nine Months Ended September 30, 2020 Nine Months Ended September 30, 2019 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 5,558.8 — $ 5,558.8 $ 7,717.7 $ — $ 7,717.7 Petroleum product sales (at wholesale) 566.3 — 566.3 877.3 — 877.3 Total petroleum product sales 6,125.1 — 6,125.1 8,595.0 — 8,595.0 Merchandise sales 2,211.4 — 2,211.4 1,946.1 — 1,946.1 Other operating revenues: RINs 63.3 — 63.3 28.6 — 28.6 Other revenues 2 3.6 — 3.6 4.6 0.1 4.7 Total revenues $ 8,403.4 $ — $ 8,403.4 $ 10,574.3 $ 0.1 $ 10,574.4 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes and other miscellaneous items

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Summary of Inventory	Inventories consisted of the following: (Millions of dollars) September 30, December 31, Finished products - First-In, First-Out ("FIFO") basis $ 203.6 $ 259.2 Less: Last-In, First-Out ("LIFO") reserve - finished products (86.3) (160.8) Finished products - LIFO basis 117.3 98.4 Store merchandise for resale 143.9 123.0 Materials and supplies 6.9 6.2 Total inventories $ 268.1 $ 227.6

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt consisted of the following: (Millions of dollars) September 30, December 31, 5.625% senior notes due 2027 (net of unamortized discount of $2.5 at September 30, 2020 and $2.7 at December 2019) $ 297.5 $ 297.3 4.75% senior notes due 2029 (net of unamortized discount of $5.6 at September 30, 2020 and $6.1 at December 31, 2019) 494.4 493.9 Term loan due 2023 (effective interest rate of 3.35% at September 30, 2020 and 4.31% at December 31, 2019) 225.0 250.0 Capitalized lease obligations, vehicles, due through 2023 2.1 2.4 Less unamortized debt issuance costs (4.6) (5.5) Total long-term debt 1,014.4 1,038.1 Less current maturities 51.2 38.8 Total long-term debt, net of current $ 963.2 $ 999.3

Asset Retirement Obligations _2

Asset Retirement Obligations (ARO) (Tables)	9 Months Ended
	Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]
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) September 30, December 31, Balance at beginning of period $ 32.8 $ 30.7 Accretion expense 1.7 2.1 Settlements of liabilities (0.7) (0.4) Liabilities incurred 0.2 0.4 Balance at end of period $ 34.0 $ 32.8

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Summary of Effective Income Tax Rates	For the three and nine month periods ended September 30, 2020 and 2019, the Company’s approximate effective tax rates were as follows: 2020 2019 Three months ended September 30, 24.1% 24.2% Nine months ended September 30, 24.1% 23.7%

Incentive Plans (Tables)

Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	Assumptions used to value awards: Dividend yield — % Expected volatility 28.1 % Risk-free interest rate 1.5 % Expected life (years) 4.7 Stock price at valuation date $ 106.72
Share-based Payment Arrangement, Option, Activity	Changes in options outstanding for Company employees during the period from December 31, 2019 to September 30, 2020 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 12/31/2019 392,300 $ 68.52 Granted 79,200 105.57 Exercised (148,800) 64.21 Outstanding at 9/30/2020 322,700 $ 79.60 4.9 $ 15.7 Exercisable at 9/30/2020 110,700 $ 66.91 3.5 $ 6.8
Share-based Payment Arrangement, Restricted Stock Unit, Activity	Changes in restricted stock units outstanding for Company employees during the period from December 31, 2019 to September 30, 2020 are presented in the following table: Employee RSUs Number of units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at 12/31/2019 198,915 $ 70.58 Granted 55,395 $ 90.64 Vested and issued (59,324) $ 66.31 $ 6.4 Forfeited (8,680) $ 78.06 Outstanding at 9/30/2020 186,306 $ 77.56 $ 23.9 Changes in performance-based restricted stock units outstanding for Company employees during the period from December 31, 2019 to September 30, 2020 are presented in the following table: Employee PSU's Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at 12/31/2019 131,200 $ 82.98 Granted 64,050 $ 123.65 Vested and issued (65,745) $ 85.04 $ 7.0 Forfeited (405) $ 65.75 Outstanding at 9/30/2020 129,100 $ 97.19 $ 16.6 Changes in restricted stock units outstanding for Company non-employee directors during the period from December 31, 2019 to September 30, 2020 are presented in the following table: Director RSU's Number of Units Weighted Average Grant Date Fair Value Total Fair Value (Millions of Dollars) Outstanding at 12/31/2019 33,607 $ 70.68 Granted 9,744 $ 105.33 Vested and issued (12,404) $ 66.01 $ 1.3 Outstanding at 9/30/2020 30,947 $ 83.46 $ 4.0

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings Per Share Computations	The following table provides a reconciliation of basic and diluted earnings per share computations for the three and nine months ended September 30, 2020 and 2019: Three Months Ended Nine Months Ended (Millions of dollars, except share and per share amounts) 2020 2019 2020 2019 Earnings per common share: Net income per share - basic Net income attributable to common stockholders $ 66.9 $ 69.2 $ 325.1 $ 107.2 Weighted average common shares outstanding (in thousands) 29,111 31,447 29,546 31,961 Earnings per common share $ 2.30 $ 2.20 $ 11.00 $ 3.35 Earnings per common share - assuming dilution: Net income per share - diluted Net income attributable to common stockholders $ 66.9 $ 69.2 $ 325.1 $ 107.2 Weighted average common shares outstanding (in thousands) 29,111 31,447 29,546 31,961 Common equivalent shares: Dilutive share-based awards 388 257 341 228 Weighted average common shares outstanding - assuming dilution (in thousands) 29,499 31,704 29,887 32,189 Earnings per common share assuming dilution $ 2.27 $ 2.18 $ 10.88 $ 3.33

Other Financial Information (Ta

Other Financial Information (Tables)	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Changes in Operating Working Capital	CHANGES IN WORKING CAPITAL: Nine Months Ended (Millions of dollars) 2020 2019 Accounts receivable $ 31.0 $ (25.4) Inventories (40.6) (12.3) Prepaid expenses and other current assets 15.3 6.8 Accounts payable and accrued liabilities (27.3) 27.2 Income taxes payable 19.4 — Net (increase) decrease in noncash operating working capital $ (2.2) $ (3.7)

Assets and Liabilities Measur_2

Assets and Liabilities Measured at Fair Value (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
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 September 30, 2020 and December 31, 2019. 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 excludes Cash and cash equivalents, Accounts receivable-trade, Restricted cash, 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. At September 30, 2020 At December 31, 2019 Carrying Carrying (Millions of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt $ (1,014.4) $ (1,043.5) $ (1,038.1) $ (1,069.4)

Lease Accounting (Tables)

Lease Accounting (Tables)	9 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Lessee, Lease	Leases are reflected in the following balance sheet accounts: (Millions of dollars) Classification September 30, December 31, Assets Operating (Right-of-use) Other Assets $ 146.3 $ 124.2 Finance Property, plant, and equipment, at cost, less accumulated depreciation of $2.7 at September 30, 2020 and $2.2 at December 31, 2019 2.6 3.0 Total leased assets $ 148.9 $ 127.2 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 7.7 $ 6.8 Finance Current maturities of long-term debt 1.2 1.2 Noncurrent Operating Deferred credits and other liabilities 140.7 118.5 Finance Long-term debt, including capitalized lease obligations 0.9 1.2 Total lease liabilities $ 150.5 $ 127.7
Lease, Cost	Lease Cost: Three Months Ended Nine Months Ended (Millions of dollars) Classification 2020 2019 2020 2019 Operating lease cost Station and other operating expenses $ 4.4 $ 3.7 $ 12.4 $ 10.8 Finance lease cost Amortization of leased assets Depreciation & amortization expense 0.3 0.3 1.0 0.9 Interest on lease liabilities Interest expense — — 0.1 0.1 Net lease costs $ 4.7 $ 4.0 $ 13.5 $ 11.8 Cash flow information: Nine Months Ended (Millions of dollars) 2020 2019 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 11.4 $ 10.2 Operating cash flows from finance leases $ 0.1 $ 0.1 Financing cash flows from finance leases $ 1.1 $ 1.1 Maturity of Lease Liabilities at September 30, 2020: (Millions of dollars) Operating leases Finance leases 2020 $ 4.1 $ 0.4 2021 16.5 1.1 2022 15.6 0.6 2023 15.1 0.1 2024 14.6 — After 2024 176.7 — Total lease payments 242.6 2.2 less: interest 94.2 0.1 Present value of lease liabilities $ 148.4 $ 2.1 Nine Months Ended 2020 Weighted average remaining lease term (years) Finance leases 1.9 Operating leases 15.8 Weighted average discount rate Finance leases 4.6 % Operating leases 5.8 %
Finance Lease, Liability, Maturity	Maturity of Lease Liabilities at September 30, 2020: (Millions of dollars) Operating leases Finance leases 2020 $ 4.1 $ 0.4 2021 16.5 1.1 2022 15.6 0.6 2023 15.1 0.1 2024 14.6 — After 2024 176.7 — Total lease payments 242.6 2.2 less: interest 94.2 0.1 Present value of lease liabilities $ 148.4 $ 2.1
Lessee, Operating Lease, Liability, Maturity	Maturity of Lease Liabilities at September 30, 2020: (Millions of dollars) Operating leases Finance leases 2020 $ 4.1 $ 0.4 2021 16.5 1.1 2022 15.6 0.6 2023 15.1 0.1 2024 14.6 — After 2024 176.7 — Total lease payments 242.6 2.2 less: interest 94.2 0.1 Present value of lease liabilities $ 148.4 $ 2.1

Business Segment (Tables)

Business Segment (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Summary of Information by Business Segment	Three Months Ended September 30, 2020 September 30, 2019 Total Assets at External Revenues Income (Loss) External Revenues Income (Loss) (Millions of dollars) September 30, 2020 Marketing $ 2,358.1 $ 2,839.1 $ 81.7 $ 3,657.6 $ 94.0 Corporate and other assets 430.1 (0.1) (14.8) — (24.8) Total $ 2,788.2 $ 2,839.0 $ 66.9 $ 3,657.6 $ 69.2 Nine Months Ended September 30, 2020 September 30, 2019 External Revenues Income (Loss) External Revenues Income (Loss) (Millions of dollars) Marketing $ 8,403.4 $ 362.2 $ 10,574.3 $ 154.7 Corporate and other assets — (37.1) 0.1 (47.5) Total $ 8,403.4 $ 325.1 $ 10,574.4 $ 107.2

Guarantor Subsidiaries (Tables)

Guarantor Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2020
Guarantor Subsidiaries [Abstract]
Consolidating Balance Sheet	CONSOLIDATING BALANCE SHEET (Millions of dollars, except share amounts) September 30, 2020 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 315.8 $ 1.7 $ — $ — $ 317.5 Accounts receivable—trade, less allowance for doubtful accounts of $0.1 in 2020 — 142.6 0.1 — — 142.7 Inventories, at lower of cost or market — 268.1 — — — 268.1 Prepaid expenses and other current assets — 14.8 0.1 — — 14.9 Total current assets — 741.3 1.9 — — 743.2 Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,151.3 in 2020 — 1,842.8 11.2 — — 1,854.0 Investments in subsidiaries 2,916.9 143.4 — — (3,060.3) — Other assets — 191.0 — — — 191.0 Total assets $ 2,916.9 $ 2,918.5 $ 13.1 $ — $ (3,060.3) $ 2,788.2 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 51.2 $ — $ — $ — $ 51.2 Inter-company accounts payable 230.9 (39.2) (37.4) (154.3) — — Trade accounts payable and accrued liabilities — 442.5 0.3 — — 442.8 Income taxes payable — 19.8 (0.4) — — 19.4 Total current liabilities 230.9 474.3 (37.5) (154.3) — 513.4 Long-term debt, including capitalized lease obligations — 963.2 — — — 963.2 Deferred income taxes — 217.5 — — — 217.5 Asset retirement obligations — 34.0 — — — 34.0 Deferred credits and other liabilities — 164.4 — — — 164.4 Total liabilities 230.9 1,853.4 (37.5) (154.3) — 1,892.5 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par 0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at September 30, 2020) 0.5 — 0.1 — (0.1) 0.5 Treasury Stock (18,199,448 shares held at September 30, 2020) (1,321.8) — — — — (1,321.8) Additional paid in capital (APIC) 1,179.8 579.1 52.0 87.5 (1,368.4) 530.0 Retained earnings 2,827.5 488.1 (1.5) 66.8 (1,691.8) 1,689.1 Accumulated other comprehensive income (loss) (AOCI) — (2.1) — — — (2.1) Total stockholders' equity 2,686.0 1,065.1 50.6 154.3 (3,060.3) 895.7 Total liabilities and stockholders' equity $ 2,916.9 $ 2,918.5 $ 13.1 $ — $ (3,060.3) $ 2,788.2 CONSOLIDATING BALANCE SHEET (Millions of dollars, except share amounts) December 31, 2019 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 279.4 $ 0.9 $ — $ — $ 280.3 Accounts receivable—trade, less allowance for doubtful accounts of $1.2 in 2019 — 173.0 (0.1) — — 172.9 Inventories, at lower of cost or market — 227.6 — — — 227.6 Prepaid expenses and other current assets — 29.6 0.4 — — 30.0 Total current assets — 709.6 1.2 — — 710.8 Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,079.2 in 2019 — 1,799.1 8.2 — — 1,807.3 Investments in subsidiaries 2,591.8 143.9 — — (2,735.7) — Other assets — 169.1 — — — 169.1 Total assets $ 2,591.8 $ 2,821.7 $ 9.4 $ — $ (2,735.7) $ 2,687.2 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 38.8 $ — $ — $ — $ 38.8 Inter-company accounts payable (0.1) 196.1 (41.7) (154.3) — — Trade accounts payable and accrued liabilities — 466.2 — — — 466.2 Total current liabilities (0.1) 701.1 (41.7) (154.3) — 505.0 Long-term debt, including capitalized lease obligations — 999.3 — — — 999.3 Deferred income taxes — 216.7 — — — 216.7 Asset retirement obligations — 32.8 — — — 32.8 Deferred credits and other liabilities — 130.4 — — — 130.4 Total liabilities (0.1) 2,080.3 (41.7) (154.3) — 1,884.2 Stockholders' Equity Preferred Stock, par $0.01 (authorized 20,000,000 shares, none outstanding) — — — — — — Common Stock, par $0.01 (authorized 200,000,000 shares, 46,767,164 shares issued at December 31, 2019) 0.5 — 0.1 — (0.1) 0.5 Treasury Stock (16,307,048 shares held at December 31, 2019 ) (1,099.8) — — — — (1,099.8) Additional paid in capital (APIC) 1,188.8 578.8 52.0 87.5 (1,368.4) 538.7 Retained earnings 2,502.4 161.9 (1.0) 66.8 (1,367.2) 1,362.9 Accumulated other comprehensive income (AOCI) — 0.7 — — — 0.7 Total stockholders' equity 2,591.9 741.4 51.1 154.3 (2,735.7) 803.0 Total liabilities and stockholders' equity $ 2,591.8 $ 2,821.7 $ 9.4 $ — $ (2,735.7) $ 2,687.2
Consolidating Income Statement	CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Three Months Ended September 30, 2020 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,056.0 $ — $ — $ — $ 2,056.0 Merchandise sales — 756.8 — — — 756.8 Other operating revenues — 26.1 0.1 — — 26.2 Total operating revenues — 2,838.9 0.1 — — 2,839.0 Operating Expenses Petroleum product cost of goods sold — 1,862.2 — — — 1,862.2 Merchandise cost of goods sold — 638.7 — — — 638.7 Station and other operating expenses — 142.8 0.1 — — 142.9 Depreciation and amortization — 40.5 0.1 — — 40.6 Selling, general and administrative — 53.7 — — — 53.7 Accretion of asset retirement obligations — 0.6 — — — 0.6 Total operating expenses — 2,738.5 0.2 — — 2,738.7 Net settlement proceeds — — — — — — Gain (loss) on sale of assets — — — — — — Income (loss) from operations — 100.4 (0.1) — — 100.3 Other income (expense) Interest income — — — — — — Interest expense — (12.4) — — — (12.4) Other nonoperating income — 0.4 (0.2) — — 0.2 Total other income (expense) — (12.0) (0.2) — — (12.2) Income (loss) before income taxes — 88.4 (0.3) — — 88.1 Income tax expense — 21.3 (0.1) — — 21.2 Income (loss) — 67.1 (0.2) — — 66.9 Equity earnings in affiliates, net of tax 66.9 (0.2) — — (66.7) — Net Income (Loss) 66.9 66.9 (0.2) — (66.7) 66.9 Other comprehensive loss — 0.4 — — — 0.4 Comprehensive income (loss) $ 66.9 $ 67.3 $ (0.2) $ — $ (66.7) $ 67.3 CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Three Months Ended September 30, 2019 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,965.5 $ — $ — $ — $ 2,965.5 Merchandise sales — 681.1 — — — 681.1 Other operating revenues — 11.0 — — — 11.0 Total operating revenues — 3,657.6 — — — 3,657.6 Operating Expenses Petroleum product cost of goods sold — 2,749.6 — — — 2,749.6 Merchandise cost of goods sold — 569.9 — — — 569.9 Station and other operating expenses — 143.4 — — — 143.4 Depreciation and amortization — 37.6 — — — 37.6 Selling, general and administrative — 36.0 — — — 36.0 Accretion of asset retirement obligations — 0.6 — — — 0.6 Total operating expenses — 3,537.1 — — — 3,537.1 Net settlement proceeds — — — — — — Gain (loss) on sale of assets — 0.2 — — — 0.2 Income (loss) from operations — 120.7 — — — 120.7 Other income (expense) Interest income — 0.8 — — — 0.8 Interest expense — (15.3) — — — (15.3) Loss on early debt extinguishment — (14.8) — — — (14.8) Other nonoperating income — — (0.1) — — (0.1) Total other income (expense) — (29.3) (0.1) — — (29.4) Income (loss) before income taxes — 91.4 (0.1) — — 91.3 Income tax expense — 22.1 — — — 22.1 Income (loss) — 69.3 (0.1) — — 69.2 Equity earnings in affiliates, net of tax 69.2 (0.1) — — (69.1) — Net Income (Loss) 69.2 69.2 (0.1) — (69.1) 69.2 Other comprehensive income (loss) — — — — — — Comprehensive income (loss) $ 69.2 $ 69.2 $ (0.1) $ — $ (69.1) $ 69.2 CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Nine Months Ended September 30, 2020 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 6,125.1 $ — $ — $ — $ 6,125.1 Merchandise sales — 2,211.4 — — — 2,211.4 Other operating revenues — 66.8 0.1 — — 66.9 Total operating revenues — 8,403.3 0.1 — — 8,403.4 Operating Expenses Petroleum product cost of goods sold — 5,409.8 — — — 5,409.8 Merchandise cost of goods sold — 1,867.4 — — — 1,867.4 Station and other operating expenses — 409.7 0.1 — — 409.8 Depreciation and amortization — 119.3 0.2 — — 119.5 Selling, general and administrative — 130.0 — — — 130.0 Accretion of asset retirement obligations — 1.7 — — — 1.7 Total operating expenses — 7,937.9 0.3 — — 7,938.2 Gain (loss) on sale of assets — 1.4 — — — 1.4 Income (loss) from operations — 466.8 (0.2) — — 466.6 Other income (expense) Interest income — 1.0 — — — 1.0 Interest expense — (38.7) — — — (38.7) Loss on early debt extinguishment — — — — — — Other nonoperating income — — (0.5) — — (0.5) Total other income (expense) — (37.7) (0.5) — — (38.2) Income (loss) before income taxes — 429.1 (0.7) — — 428.4 Income tax expense — 103.5 (0.2) — — 103.3 Income (loss) — 325.6 (0.5) — — 325.1 Equity earnings in affiliates, net of tax 325.1 (0.5) — — (324.6) — Net Income (Loss) 325.1 325.1 (0.5) — (324.6) 325.1 Other comprehensive income (loss) — (2.8) — — — (2.8) Comprehensive income (loss) $ 325.1 $ 322.3 $ (0.5) $ — $ (324.6) $ 322.3 CONSOLIDATING INCOME STATEMENT AND COMPREHENSIVE INCOME (Millions of dollars) Nine Months Ended September 30, 2019 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 8,595.0 $ — $ — $ — $ 8,595.0 Merchandise sales — 1,946.1 — — — 1,946.1 Other operating revenues — 33.3 — — — 33.3 Total operating revenues — 10,574.4 — — — 10,574.4 Operating Expenses Petroleum product cost of goods sold — 8,104.8 — — — 8,104.8 Merchandise cost of goods sold — 1,631.9 — — — 1,631.9 Station and other operating expenses — 421.8 — — — 421.8 Depreciation and amortization — 113.8 — — — 113.8 Selling, general and administrative — 105.7 — — — 105.7 Accretion of asset retirement obligations — 1.6 — — — 1.6 Total operating expenses — 10,379.6 — — — 10,379.6 Net settlement proceeds — 0.1 — — — 0.1 Gain (loss) on sale of assets — 0.1 — — — 0.1 Income (loss) from operations — 195.0 — — — 195.0 Other income (expense) Interest income — 2.4 — — — 2.4 Interest expense — (42.1) — — — (42.1) Loss on early debt extinguishment — (14.8) — — — (14.8) Other nonoperating income — 0.5 (0.5) — — — Total other income (expense) — (54.0) (0.5) — — (54.5) Income (loss) before income taxes — 141.0 (0.5) — — 140.5 Income tax expense — 33.4 (0.1) — — 33.3 Income (loss) — 107.6 (0.4) — — 107.2 Equity earnings in affiliates, net of tax 107.2 (0.4) — — (106.8) — Net Income (Loss) 107.2 107.2 (0.4) — (106.8) 107.2 Other comprehensive income (loss) — — — — — — Comprehensive income (loss) $ 107.2 $ 107.2 $ (0.4) $ — $ (106.8) $ 107.2
Consolidating Statement of Cash Flow	CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Nine Months Ended September 30, 2020 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 325.1 $ 325.1 $ (0.5) $ — $ (324.6) $ 325.1 Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities Depreciation and amortization — 119.3 0.2 — — 119.5 Deferred and noncurrent income tax charges (credits) — 1.7 — — — 1.7 Accretion of asset retirement obligations — 1.7 — — — 1.7 (Gain) loss on sale of assets — (1.4) — — — (1.4) Net (increase) decrease in noncash operating working capital — (2.1) (0.1) — — (2.2) Equity in earnings of affiliates (325.1) 0.5 — — 324.6 — Other operating activities - net — 23.4 — — — 23.4 Net cash provided by (required by) operating activities — 468.2 (0.4) — — 467.8 Investing Activities Property additions — (166.2) (3.2) — — (169.4) Proceeds from sale of assets — 7.7 — — — 7.7 Other investing activities - net — (1.6) — — — (1.6) Net cash provided by (required by) investing activities — (160.1) (3.2) — — (163.3) Financing Activities Purchase of treasury stock (230.5) — — — — (230.5) Borrowings of debt — — — — — — Repayments of debt — (26.1) — — — (26.1) Amounts related to share-based compensation — (10.7) — — — (10.7) Net distributions to parent 230.5 (234.9) 4.4 — — — Net cash provided by (required by) financing activities — (271.7) 4.4 — — (267.3) Net increase (decrease) in cash and cash equivalents — 36.4 0.8 — — 37.2 Cash, cash equivalents, and restricted cash at January 1 — 279.4 0.9 — — 280.3 Cash, cash equivalents, and restricted cash at September 30 $ — $ 315.8 $ 1.7 $ — $ — $ 317.5 CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Nine Months Ended September 30, 2019 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 107.2 $ 107.2 $ (0.4) $ — $ (106.8) $ 107.2 Adjustments to reconcile net income (loss) to net cash provided by (required by)operating activities Depreciation and amortization — 113.8 — — — 113.8 Deferred and noncurrent income tax charges (credits) — 6.9 — — — 6.9 Accretion of asset retirement obligations — 1.6 — — — 1.6 Pretax (gains) losses from sale of assets — (0.1) — — — (0.1) Net (increase) decrease in noncash operating working capital — (3.6) (0.1) — — (3.7) Equity in earnings of affiliates (107.2) 0.4 — — 106.8 — Loss on early debt extinguishment — 14.8 — — — 14.8 Other operating activities - net — 11.1 — — — 11.1 Net cash provided by (required by) operating activities — 252.1 (0.5) — — 251.6 Investing Activities Property additions — (149.3) (4.4) — — (153.7) Proceeds from sale of assets — 2.4 — — — 2.4 Other investing activities - net — (0.7) — — — (0.7) Net cash provided by (required by) investing activities — (147.6) (4.4) — — (152.0) Financing Activities Purchase of treasury stock (139.1) — — — — (139.1) Borrowings of debt — 693.7 — — — 693.7 Repayments of debt — (573.1) — — — (573.1) Debt issuance costs — (3.1) — — — (3.1) Early debt extinguishment costs — (10.4) — — — (10.4) Amounts related to share-based compensation — (4.4) — — — (4.4) Net distributions to parent 139.1 (144.3) 5.2 — — — Net cash provided by (required) by financing activities — (41.6) 5.2 — — (36.4) Net increase (decrease) in cash and cash equivalents — 62.9 0.3 — — 63.2 Cash, cash equivalents, and restricted cash at January 1 — 184.0 0.5 — — 184.5 Cash, cash equivalents, and restricted cash at September 30 $ — $ 246.9 $ 0.8 $ — $ — $ 247.7
Consolidating Statement of Changes in Equity	CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Nine Months Ended September 30, 2020 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2019 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Issuance of common stock — — — — — — Balance as of March 31, 2020 0.5 — 0.1 — (0.1) 0.5 Issuance of common stock — — — — — — Balance as of June 30, 2020 0.5 — 0.1 — (0.1) 0.5 Issuance of common stock — — — — — — Balance as of September 30, 2020 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Treasury Stock Balance as of December 31, 2019 $ (1,099.8) $ — $ — $ — $ — $ (1,099.8) Issuance of treasury stock 5.2 — — — — 5.2 Repurchase of treasury stock (140.6) — — — — (140.6) Balance as of March 31, 2020 (1,235.2) — — — — (1,235.2) Issuance of treasury stock — — — — — — Repurchase of treasury stock — — — — — — Balance as of June 30, 2020 (1,235.2) — — — — (1,235.2) Issuance of treasury stock 3.3 — — — — 3.3 Repurchase of treasury stock (89.9) — — — — (89.9) Balance as of September 30, 2020 $ (1,321.8) $ — $ — $ — $ — $ (1,321.8) APIC Balance as of December 31, 2019 $ 1,188.8 $ 578.8 $ 52.0 $ 87.5 $ (1,368.4) $ 538.7 Issuance of treasury stock (5.7) — — — — (5.7) Amounts related to share-based compensation — (5.6) — — — (5.6) Share-based compensation expense — 2.8 — — — 2.8 Balance as of March 31, 2020 1,183.1 576.0 52.0 87.5 (1,368.4) 530.2 Issuance of treasury stock — — — — — — Amounts related to share-based compensation — — — — — — Share-based compensation expense — 2.8 — — — 2.8 Balance as of June 30, 2020 1,183.1 578.8 52.0 87.5 (1,368.4) 533.0 Issuance of treasury stock (3.3) — — — — (3.3) Amounts related to share-based compensation — (5.1) — — — (5.1) Share-based compensation expense — 5.4 — — — 5.4 Balance as of September 30, 2020 $ 1,179.8 $ 579.1 $ 52.0 $ 87.5 $ (1,368.4) $ 530.0 (Millions of dollars) Nine Months Ended September 30, 2020 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Retained Earnings Balance as of December 31, 2019 $ 2,502.4 $ 161.9 $ (1.0) $ 66.8 $ (1,367.2) $ 1,362.9 Cumulative effect of a change in accounting principle — 1.1 — — — 1.1 Net income (loss) 89.3 89.3 (0.1) — (89.2) 89.3 Balance as of March 31, 2020 2,591.7 252.3 (1.1) 66.8 (1,456.4) 1,453.3 Net income (loss) 168.9 168.9 (0.2) — (168.7) 168.9 Balance as of June 30, 2020 2,760.6 421.2 (1.3) 66.8 (1,625.1) 1,622.2 Net income (loss) 66.9 66.9 (0.2) — (66.7) 66.9 Balance as of September 30, 2020 $ 2,827.5 $ 488.1 $ (1.5) $ 66.8 $ (1,691.8) $ 1,689.1 AOCI Balance as of December 31, 2019 $ — $ 0.7 $ — $ — $ — $ 0.7 Other comprehensive income (loss) — (2.7) — — — (2.7) Balance as of March 31, 2020 — (2.0) — — — (2.0) Net income (loss) — (0.5) — — — (0.5) Balance as of June 30, 2020 — (2.5) — — — (2.5) Net income (loss) — 0.4 — — — 0.4 Balance as of September 30, 2020 $ — $ (2.1) $ — $ — $ — $ (2.1) CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Nine Months Ended September 30, 2019 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2018 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Issuance of common stock — — — — — — Balance as of March 31, 2019 0.5 — 0.1 — (0.1) $ 0.5 Issuance of common stock — — — — — — Balance as of June 30, 2019 0.5 — 0.1 — (0.1) 0.5 Issuance of common stock — — — — — — Balance as of September 30, 2019 $ 0.5 $ — $ 0.1 $ — $ (0.1) $ 0.5 Treasury Stock Balance as of December 31, 2018 $ (940.3) $ — $ — $ — $ — $ (940.3) Issuance of treasury stock 5.6 — — — — 5.6 Repurchase of treasury stock (13.3) — — — — (13.3) Balance as of March 31, 2019 (948.0) — — — — (948.0) Issuance of treasury stock 0.1 — — — — 0.1 Repurchase of treasury stock (16.8) — — — — (16.8) Balance as of June 30, 2019 (964.7) — — — — (964.7) Issuance of treasury stock 0.5 — — — — 0.5 Repurchase of treasury stock (109.0) — — — — (109.0) Balance as of September 30, 2019 $ (1,073.2) $ — $ — $ — $ — $ (1,073.2) APIC Balance as of December 31, 2018 $ 1,195.1 $ 572.8 $ 52.0 $ 87.5 $ (1,368.4) $ 539.0 Issuance of treasury stock (5.6) — — — — (5.6) Amounts related to share-based compensation — (4.1) — — — (4.1) Share-based compensation expense — 2.6 — — — 2.6 Balance as of March 31, 2019 1,189.5 571.3 52.0 87.5 (1,368.4) $ 531.9 Issuance of treasury stock (0.1) — — — — (0.1) Amounts related to share-based compensation — (0.2) — — — (0.2) Share-based compensation expense — 2.8 — — — 2.8 Balance as of June 30, 2019 1,189.4 573.9 52.0 87.5 (1,368.4) 534.4 Issuance of treasury stock (0.5) (0.5) Amounts related to share-based compensation — (0.1) — — — (0.1) Share-based compensation expense — 2.6 — — — 2.6 Balance as of September 30, 2019 $ 1,188.9 $ 576.4 $ 52.0 $ 87.5 $ (1,368.4) $ 536.4 (Millions of dollars) Nine Months Ended September 30, 2019 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Retained Earnings Balance as of December 31, 2018 $ 2,181.8 $ 172.9 $ (0.5) $ 66.8 $ (1,212.9) $ 1,208.1 Net income (loss) 5.3 5.3 (0.2) — (5.1) 5.3 Balance as of March 31, 2019 2,187.1 178.2 (0.7) 66.8 (1,218.0) 1,213.4 Net income (loss) 32.7 32.7 (0.1) — (32.6) 32.7 Balance as of June 30, 2019 2,219.8 210.9 (0.8) 66.8 (1,250.6) 1,246.1 Net income (loss) 69.2 69.2 (0.1) — (69.1) 69.2 Balance as of September 30, 2019 $ 2,289.0 $ 280.1 $ (0.9) $ 66.8 $ (1,319.7) $ 1,315.3 AOCI Balance as of December 31, 2018 $ — $ — $ — $ — $ — $ — Other comprehensive income (loss) — — — — — — Balance as of March 31, 2019 — — — — — — Other comprehensive income (loss) — — — — — — Balance as of June 30, 2019 — — — — — — Other comprehensive income (loss) — — — — — — Balance as of September 30, 2019 $ — $ — $ — $ — $ — $ —

Description of Business and B_3

Description of Business and Basis of Presentation (Details)	Aug. 30, 2013	Mar. 31, 2013USD ($)shares	Sep. 30, 2020stationstate$ / shares	Jan. 01, 2020USD ($)	Dec. 31, 2019$ / shares	Sep. 30, 2013$ / shares
Product Information [Line Items]
Number of states in which entity operates | state			25
Number of stations			1,488
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 (percent)	100.00%
Accounting Standards Update 2016-13
Product Information [Line Items]
Allowance for credit loss | $				$ 1,100,000
Murphy USA
Product Information [Line Items]
Number of stations			1,151
Murphy Express
Product Information [Line Items]
Number of stations			337

Revenues (Disaggregation of Rev

Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 2,839	$ 3,657.6	$ 8,403.4	$ 10,574.4
Total petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue	2,056	2,965.5	6,125.1	8,595
Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue	1,867.8	2,660.8	5,558.8	7,717.7
Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue	188.2	304.7	566.3	877.3
Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	756.8	681.1	2,211.4	1,946.1
RINs
Disaggregation of Revenue [Line Items]
Revenue	25.2	8.6	63.3	28.6
Other revenues
Disaggregation of Revenue [Line Items]
Revenue	1	2.4	3.6	4.7
Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Revenue	2,839.1	3,657.6	8,403.4	10,574.3
Operating Segments | Marketing | Total petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue	2,056	2,965.5	6,125.1	8,595
Operating Segments | Marketing | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue	1,867.8	2,660.8	5,558.8	7,717.7
Operating Segments | Marketing | Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue	188.2	304.7	566.3	877.3
Operating Segments | Marketing | Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	756.8	681.1	2,211.4	1,946.1
Operating Segments | Marketing | RINs
Disaggregation of Revenue [Line Items]
Revenue	25.2	8.6	63.3	28.6
Operating Segments | Marketing | Other revenues
Disaggregation of Revenue [Line Items]
Revenue	1.1	2.4	3.6	4.6
Corporate and other assets
Disaggregation of Revenue [Line Items]
Revenue	(0.1)	0	0	0.1
Corporate and other assets | Total petroleum product sales
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corporate and other assets | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corporate and other assets | Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corporate and other assets | Merchandise sales
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corporate and other assets | RINs
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Corporate and other assets | Other revenues
Disaggregation of Revenue [Line Items]
Revenue	$ (0.1)	$ 0	$ 0	$ 0.1

Revenues (Narrative) (Details)

Revenues (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Trade accounts receivable	$ 142.7	$ 172.9
Receivables related to contracts with customers
Disaggregation of Revenue [Line Items]
Trade accounts receivable	$ 74	$ 96
RINs
Disaggregation of Revenue [Line Items]
Collection period	5 days
Bulk pipelines sales
Disaggregation of Revenue [Line Items]
Collection period	7 days
Product Sales, Petroleum, Wholesale Rack Sales
Disaggregation of Revenue [Line Items]
Collection period	10 days
Minimum | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Collection period	2 days
Maximum | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Collection period	7 days

Inventories (Summary Of Invento

Inventories (Summary Of Inventory) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Finished products - First-In, First-Out ("FIFO") basis	$ 203.6	$ 259.2
Less: Last-In, First-Out ("LIFO") reserve - finished products	(86.3)	(160.8)
Finished products - LIFO basis	117.3	98.4
Store merchandise for resale	143.9	123
Materials and supplies	6.9	6.2
Total inventories	$ 268.1	$ 227.6

Inventories - Narrative (Detail

Inventories - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
LIFO inventories in excess of carrying value	$ 86.3	$ 160.8

Long-Term Debt (Summary Of Long

Long-Term Debt (Summary Of Long-Term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 13, 2019	Apr. 25, 2017
Debt Instrument [Line Items]
Capitalized lease obligations, vehicles, due through 2023	$ 2.1	$ 2.4
Less unamortized debt issuance costs	(4.6)	(5.5)
Total long-term debt	1,014.4	1,038.1
Less current maturities	51.2	38.8
Total long-term debt, net of current	963.2	999.3
Senior Notes | 5.625% senior notes due 2027
Debt Instrument [Line Items]
Long-term debt, gross	$ 297.5	297.3
Stated interest rate	5.625%			5.625%
Unamortized discount	$ 2.5	2.7
Senior Notes | 4.75% senior notes due 2029
Debt Instrument [Line Items]
Stated interest rate	4.75%
Secured Debt | 4.75% senior notes due 2029 | Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	$ 494.4	493.9
Stated interest rate	4.75%		4.75%
Unamortized discount	$ 5.6	6.1
Secured Debt | Term loan due 2023 | Term facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 225	$ 250
Effective interest rate	3.35%	4.31%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	Apr. 01, 2020	Dec. 31, 2019	Sep. 13, 2019	Aug. 27, 2019	Sep. 30, 2020	Sep. 30, 2019	Aug. 31, 2019	Apr. 25, 2017
Debt Instrument [Line Items]
Repayments of debt					$ 26,100,000	$ 573,100,000
Dividend restrictions					The credit agreement contains restrictions on certain payments, including dividends, when availability under the credit agreement is less than or equal to the greater of 100000000 and 0.25 of the lesser of the revolving commitments and the borrowing base and our fixed charge coverage ratio is less than 1 to 1.0 (unless availability under the credit agreement is greater than 100000000 and 0.4 of the lesser of the revolving commitments and the borrowing base). As of 44104, our ability to make restricted payments was not limited as our fixed charge coverage ratio was greater than 1 to 1.0, at 1.14..
Fixed charge coverage ratio					1.14
Fixed charge coverage ratio threshold, percentage of aggregate facility commitments and borrowing base					17.50%
Fixed charge coverage ratio threshold, amount of aggregate facility commitments and borrowing base					$ 70,000,000
Secured debt to EBITDA ratio					0.32
Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio					1
Period for fixed charge coverage ratio threshold (in days)					3 days
Dividend restriction threshold as amount of availability					$ 100,000,000
Dividend restriction threshold as a percentage of revolving commitments and borrowing base					25.00%
Dividend restrictions, fixed charge coverage ratio					1
Maximum
Debt Instrument [Line Items]
Secured debt to EBITDA ratio					4.5
Dividend restriction threshold as a percentage of revolving commitments and borrowing base with consideration of fixed charge coverage ratio					40.00%
Federal Funds Rate
Debt Instrument [Line Items]
Spread over variable rate (percent)					0.50%
LIBOR
Debt Instrument [Line Items]
Spread over variable rate (percent)					1.00%
Interest period one (in months)					1 month
Interest period two (in months)					2 months
Interest period three (in months)					3 months
Interest period four (in months)					6 months
Cash
Debt Instrument [Line Items]
Percentage of asset available to borrow against					100.00%
Credit Card Receivables
Debt Instrument [Line Items]
Percentage of asset available to borrow against					90.00%
Investment Grade Accounts
Debt Instrument [Line Items]
Percentage of asset available to borrow against					90.00%
Other Accounts
Debt Instrument [Line Items]
Percentage of asset available to borrow against					85.00%
Midstream Refined Products Inventory
Debt Instrument [Line Items]
Percentage of asset available to borrow against					80.00%
Refined Retail Products Inventory
Debt Instrument [Line Items]
Percentage of asset available to borrow against					75.00%
Retail Merchandise Inventory
Debt Instrument [Line Items]
Percentage of asset available to borrow against					70.00%
Percentage of net orderly liquidation value available to borrow against					85.00%
ABL facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 325,000,000
ABL facility | LIBOR | Minimum
Debt Instrument [Line Items]
Spread over variable rate (percent)					1.50%
ABL facility | LIBOR | Maximum
Debt Instrument [Line Items]
Spread over variable rate (percent)					2.00%
ABL facility | Alternate Base Rate | Minimum
Debt Instrument [Line Items]
Spread over variable rate (percent)					0.50%
ABL facility | Alternate Base Rate | Maximum
Debt Instrument [Line Items]
Spread over variable rate (percent)					1.00%
Term facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							250,000,000
Proceeds borrowed from credit facility		$ 50,000,000		$ 200,000,000
Term of facility				4 years
Repayments of debt				$ 57,000,000
Asset-based loan facility, portion included in current maturities		$ 250,000,000			$ 225,000,000
Quarterly principal payments	$ 12,500,000
Term facility | LIBOR | Minimum
Debt Instrument [Line Items]
Spread over variable rate (percent)					2.50%
Term facility | LIBOR | Maximum
Debt Instrument [Line Items]
Spread over variable rate (percent)					2.75%
Term facility | Alternate Base Rate | Minimum
Debt Instrument [Line Items]
Spread over variable rate (percent)					1.50%
Term facility | Alternate Base Rate | Maximum
Debt Instrument [Line Items]
Spread over variable rate (percent)					1.75%
Uncommitted incremental facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							150,000,000
Letters of credit
Debt Instrument [Line Items]
Line of credit facility, sublimit							$ 100,000,000
Asset Based Loan Facility
Debt Instrument [Line Items]
Remaining loan amount available					$ 197,300,000
5.625% Senior Notes Due 2027 | 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 | Senior Notes
Debt Instrument [Line Items]
Senior notes, principal amount			$ 500,000,000
Interest rate					4.75%
4.75% senior notes due 2029 | ABL facility | Line of Credit
Debt Instrument [Line Items]
Interest rate			4.75%		4.75%
Term loan due 2023 | Senior Notes
Debt Instrument [Line Items]
Redemption of aggregate principal amount			$ 500,000,000
Asset Based Loan Facility
Debt Instrument [Line Items]
Asset-based loan facility, portion included in current maturities					$ 0

Asset Retirement Obligations _3

Asset Retirement Obligations (ARO) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Asset Retirement Obligation Roll Forward
Balance at beginning of period			$ 32.8	$ 30.7	$ 30.7
Accretion expense	$ 0.6	$ 0.6	1.7	$ 1.6	2.1
Settlements of liabilities			(0.7)		(0.4)
Liabilities incurred			0.2		0.4
Balance at end of period	$ 34		$ 34		$ 32.8

Income Taxes (Summary of Effect

Income Taxes (Summary of Effective Income Tax Rates) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Effective tax rate	24.10%	24.20%	24.10%	23.70%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Total excess tax benefits	$ 1.4	$ 0.9
Other discrete tax items	$ 1.7

Incentive Plans (Narrative) (De

Incentive Plans (Narrative) (Details)	Aug. 30, 2013USD ($)shares	Feb. 29, 2020$ / sharescompany	Sep. 30, 2020USD ($)$ / shares	Sep. 30, 2019USD ($)	Aug. 08, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation | $			$ 11,000,000	$ 8,000,000
Total income tax benefits realized from tax deductions related to stock option exercises under share-based payment arrangements | $			$ 800,000	$ 100,000
Performance Units
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)			$ 123.65
2013 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for incentive plan (no more than) (in shares) | shares	5,500,000
Number of shares per employee (no more than) (in shares) | shares	1,000,000
Award expiration period		7 years
2013 Long-Term Incentive Plan | Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum amount payable | $	$ 5,000,000
2013 Long-Term Incentive Plan | Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted, fair value (in dollars per share)		$ 28.28
2013 Long-Term Incentive Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			3 years
2013 Long-Term Incentive 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
Restricted stock units issued, weighted average grant date fair value (in dollars per share)		$ 106.72
2013 Long-Term Incentive 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 | company		18
Restricted stock units issued, weighted average grant date fair value (in dollars per share)		$ 142.07
2013 Stock Plan For 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) | shares					500,000
2013 Stock Plan For Non-Employee Directors | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			3 years
Restricted stock units issued, weighted average grant date fair value (in dollars per share)			$ 105.33

Incentive Plans (Valuation Assu

Incentive Plans (Valuation Assumptions) (Details) - 2013 Long-Term Incentive Plan	1 Months Ended
	Feb. 29, 2020$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Expected volatility	28.10%
Risk-free interest rate	1.50%
Expected life (years)	4 years 8 months 12 days
Stock price at valuation date (in dollars per share)	$ 106.72

Incentive Plans (Summary of Cha

Incentive Plans (Summary of Changes in Stock Options Outstanding) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)$ / sharesshares
Number of Shares (in shares)
Beginning balance (in shares) | shares	392,300
Granted (in shares) | shares	79,200
Exercised (in shares) | shares	(148,800)
Ending balance (in shares) | shares	322,700
Exercisable (in shares) | shares	110,700
Weighted Average Exercise Price (in dollars per share)
Beginning balance (in dollars per share) | $ / shares	$ 68.52
Granted (in dollars per share) | $ / shares	105.57
Exercised (in dollars per share) | $ / shares	64.21
Ending balance (in dollars per share) | $ / shares	79.60
Exercisable (in dollars per share) | $ / shares	$ 66.91
Options outstanding, average remaining life (in years)	4 years 10 months 24 days
Options exercisable, average remaining life (in years)	3 years 6 months
Options outstanding, aggregate intrinsic value | $	$ 15.7
Options exercisable, aggregate intrinsic value | $	$ 6.8

Incentive Plans (Summary of Res

Incentive Plans (Summary of Restricted Stock Units Activity) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)$ / sharesshares
Time-Based Restricted Stock Units
Number of Shares (in shares)
Beginning balance (in shares) | shares	198,915
Granted (in shares) | shares	55,395
Vested and issued (in shares) | shares	(59,324)
Forfeited (in shares) | shares	(8,680)
Ending balance (in shares) | shares	186,306
Weighted Average Grant Date Fair Value (in dollars per share)
Beginning balance (in dollars per share) | $ / shares	$ 70.58
Granted (in dollars per share) | $ / shares	90.64
Vested and issued (in dollars per share) | $ / shares	66.31
Forfeited (in dollars per share) | $ / shares	78.06
Ending balance (in dollars per share) | $ / shares	$ 77.56
Total fair value, vested | $	$ 6.4
Total fair value, outstanding | $	$ 23.9
Performance Units
Number of Shares (in shares)
Beginning balance (in shares) | shares	131,200
Granted (in shares) | shares	64,050
Vested and issued (in shares) | shares	(65,745)
Forfeited (in shares) | shares	(405)
Ending balance (in shares) | shares	129,100
Weighted Average Grant Date Fair Value (in dollars per share)
Beginning balance (in dollars per share) | $ / shares	$ 82.98
Granted (in dollars per share) | $ / shares	123.65
Vested and issued (in dollars per share) | $ / shares	85.04
Forfeited (in dollars per share) | $ / shares	65.75
Ending balance (in dollars per share) | $ / shares	$ 97.19
Total fair value, vested | $	$ 7
Total fair value, outstanding | $	$ 16.6
Restricted Stock Units | 2013 Stock Plan For Non-Employee Directors
Number of Shares (in shares)
Beginning balance (in shares) | shares	33,607
Granted (in shares) | shares	9,744
Vested and issued (in shares) | shares	(12,404)
Ending balance (in shares) | shares	30,947
Weighted Average Grant Date Fair Value (in dollars per share)
Beginning balance (in dollars per share) | $ / shares	$ 70.68
Granted (in dollars per share) | $ / shares	105.33
Vested and issued (in dollars per share) | $ / shares	66.01
Ending balance (in dollars per share) | $ / shares	$ 83.46
Total fair value, vested | $	$ 1.3
Total fair value, outstanding | $	$ 4

Financial Instruments and Ris_2

Financial Instruments and Risk Management (Details) - USD ($) $ in Millions	Mar. 27, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Sep. 27, 2019
Derivative [Line Items]
Realized loss on interest rate swap		$ 0.4	$ 0	$ 0.5	$ 0
Pretax gain (losses) on interest rate swap contracts		0.5	0	(3.7)	0
Deferred income tax expense (benefit)		0.1	$ 0	(0.9)	$ 0
Interest Rate Swap
Derivative [Line Items]
Derivative amount		127.5		127.5			$ 150
Notional amount, quarterly reduction	$ 7.5
Prepaid expenses and other current assets
Derivative [Line Items]
Cash deposits related to commodity derivative contracts		$ 0		$ 0		$ 1

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - USD ($)	Jul. 24, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 400,000,000
Stock repurchase program, period	2 years
January 2016 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, shares acquired (in shares)		2,018,934	1,597,731
Stock repurchase program, average price per share (in dollars per share)		$ 114.16	$ 87.09

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						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income per share - basic
Net income attributable to common stockholders	$ 66.9	$ 168.9	$ 89.3	$ 69.2	$ 32.7	$ 5.3	$ 325.1	$ 107.2
Weighted average common shares outstanding (in shares)	29,111			31,447			29,546	31,961
Earnings per common share (in dollars per share)	$ 2.30			$ 2.20			$ 11	$ 3.35
Net income per share - diluted
Net income attributable to common stockholders	$ 66.9	$ 168.9	$ 89.3	$ 69.2	$ 32.7	$ 5.3	$ 325.1	$ 107.2
Weighted average common shares outstanding (in shares)	29,111			31,447			29,546	31,961
Common equivalent shares:
Dilutive share-based awards (in shares)	388			257			341	228
Weighted average common shares outstanding - assuming dilution (in shares)	29,499			31,704			29,887	32,189
Earnings per common share assuming dilution (in dollars per share)	$ 2.27			$ 2.18			$ 10.88	$ 3.33

Other Financial Information (Na

Other Financial Information (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash income taxes paid (collected), net of refunds	$ 66.5	$ 16.2
Interest paid, net of amounts capitalized	$ 39	$ 46

Other Financial Information (Su

Other Financial Information (Summary of Changes in Operating Working Capital) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ 31	$ (25.4)
Inventories	(40.6)	(12.3)
Prepaid expenses and other current assets	15.3	6.8
Accounts payable and accrued liabilities	(27.3)	27.2
Income taxes payable	19.4	0
Net (increase) decrease in noncash operating working capital	$ (2.2)	$ (3.7)

Assets and Liabilities Measur_3

Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Carrying Amount
Financial liabilities
Current and long-term debt	$ (1,014.4)	$ (1,038.1)
Fair Value
Financial liabilities
Current and long-term debt	$ (1,043.5)	$ (1,069.4)

Contingencies (Details)

Contingencies (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)site
Loss Contingencies [Line Items]
Number of Superfund sites for which company may be liable | site	1
Outstanding letters of credit	$ 13
Workers Compensation Insurance Claims
Loss Contingencies [Line Items]
Insurance deductible amount	1
General Liability Insurance Claims
Loss Contingencies [Line Items]
Insurance deductible amount	3
Auto Liability Insurance Claims
Loss Contingencies [Line Items]
Insurance deductible amount	0.3
Insurance Claims
Loss Contingencies [Line Items]
Loss contingency accrual	$ 26.7

Lease Accounting (Narrative) (D

Lease Accounting (Narrative) (Details)	9 Months Ended
	Sep. 30, 2020contractsite
Lessee, Lease, Description [Line Items]
Number of leases with restrictive covenants | site	102
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Lease renewal term	5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	20 years
Lease renewal term	20 years
Land
Lessee, Lease, Description [Line Items]
Number of leases	222
Terminal
Lessee, Lease, Description [Line Items]
Number of leases	1
Hangar
Lessee, Lease, Description [Line Items]
Number of leases	1

Lease Accounting (Leases Reflec

Lease Accounting (Leases Reflected on Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets
Operating (Right-of-use)	$ 146.3	$ 124.2
Finance	2.6	3
Total leased assets	148.9	127.2
Current
Operating	7.7	6.8
Finance	1.2	1.2
Noncurrent
Operating	140.7	118.5
Finance	0.9	1.2
Total lease liabilities	150.5	127.7
Accumulated depreciation	$ 2.7	$ 2.2
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet

Lease Accounting (Lease Cost) (

Lease Accounting (Lease Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 4.4	$ 3.7	$ 12.4	$ 10.8
Finance lease cost
Amortization of leased assets	0.3	0.3	1	0.9
Interest on lease liabilities	0	0	0.1	0.1
Net lease costs	$ 4.7	$ 4	$ 13.5	$ 11.8

Lease Accounting (Cash Flow Inf

Lease Accounting (Cash Flow Information) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of liabilities
Operating cash flows from operating leases	$ 11.4	$ 10.2
Operating cash flows from finance leases	0.1	0.1
Financing cash flows from finance leases	$ 1.1	$ 1.1

Lease Accounting (Maturity of L

Lease Accounting (Maturity of Lease Liability) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Operating leases
2020	$ 4.1
2021	16.5
2022	15.6
2023	15.1
2024	14.6
After 2024	176.7
Total lease payments	242.6
less: interest	94.2
Present value of lease liabilities	148.4
Finance leases
2020	0.4
2021	1.1
2022	0.6
2023	0.1
2024	0
After 2024	0
Total lease payments	2.2
less: interest	0.1
Present value of lease liabilities	$ 2.1	$ 2.4

Lease Accounting (Lease Term an

Lease Accounting (Lease Term and Discount Rate) (Details)	Sep. 30, 2020
Weighted average remaining lease term (years)
Finance leases	1 year 10 months 24 days
Operating leases	15 years 9 months 18 days
Weighted average discount rate
Finance leases (percent)	4.60%
Operating leases (percent)	5.80%

Business Segment (Narrative) (D

Business Segment (Narrative) (Details)	9 Months Ended
	Sep. 30, 2020segment
Segment Reporting [Abstract]
Number of operating segments	1

Business Segment (Summary of In

Business Segment (Summary of Information by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 2,788.2						$ 2,788.2		$ 2,687.2
External revenues	2,839			$ 3,657.6			8,403.4	$ 10,574.4
Income (Loss)	66.9	$ 168.9	$ 89.3	69.2	$ 32.7	$ 5.3	325.1	107.2
Operating Segments | Marketing
Segment Reporting Information [Line Items]
Total assets	2,358.1						2,358.1
External revenues	2,839.1			3,657.6			8,403.4	10,574.3
Income (Loss)	81.7			94			362.2	154.7
Corporate and other assets
Segment Reporting Information [Line Items]
Total assets	430.1						430.1
External revenues	(0.1)			0			0	0.1
Income (Loss)	$ (14.8)			$ (24.8)			$ (37.1)	$ (47.5)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	Oct. 28, 2020	Jul. 24, 2019
Subsequent Event [Line Items]
Stock repurchase program, authorized amount		$ 400,000,000
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 500,000,000
Subsequent Event | Dividend, Quarterly Basis
Subsequent Event [Line Items]
Dividend payable (in dollars per share)	$ 0.25
Subsequent Event | Dividend, Annualized Basis
Subsequent Event [Line Items]
Dividend payable (in dollars per share)	$ 1

Guarantor Subsidiaries (Additio

Guarantor Subsidiaries (Additional Information) (Details) - Senior Notes	Sep. 30, 2020	Apr. 25, 2017
5.625% Senior Notes Due 2027
Debt Instrument [Line Items]
Interest rate	5.625%	5.625%
4.75% senior notes due 2029
Debt Instrument [Line Items]
Interest rate	4.75%

Guarantor Subsidiaries (Consoli

Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2013
Current assets
Cash and cash equivalents	$ 317.5			$ 280.3
Accounts receivable—trade, less allowance for doubtful accounts	142.7			172.9
Inventories, at lower of cost or market	268.1			227.6
Prepaid expenses and other current assets	14.9			30
Total current assets	743.2			710.8
Property, plant and equipment, at cost less accumulated depreciation and amortization	1,854			1,807.3
Investments in subsidiaries	0			0
Other assets	191			169.1
Total assets	2,788.2			2,687.2
Current liabilities
Current maturities of long-term debt	51.2			38.8
Inter-company accounts payable	0			0
Trade accounts payable and accrued liabilities	442.8			466.2
Income taxes payable	19.4			0
Total current liabilities	513.4			505
Long-term debt, including capitalized lease obligations	963.2			999.3
Deferred income taxes	217.5			216.7
Asset retirement obligations	34			32.8
Deferred credits and other liabilities	164.4			130.4
Total liabilities	1,892.5			1,884.2
Stockholders' Equity
Preferred Stock	0			0
Common Stock	0.5			0.5
Treasury Stock	(1,321.8)			(1,099.8)
Additional paid in capital (APIC)	530			538.7
Retained earnings	1,689.1			1,362.9
Accumulated other comprehensive income (loss) (AOCI)	(2.1)			0.7
Total stockholders' equity	895.7	$ 918	$ 746.8	803	$ 779	$ 816.3	$ 797.8	$ 807.3
Total liabilities and stockholders' equity	2,788.2			2,687.2
Allowance for doubtful accounts	0.1			1.2
Property, plant and equipment, accumulated depreciation and amortization	$ 1,151.3			$ 1,079.2
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					$ 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)	18,199,448			16,307,048
Eliminations
Current assets
Cash and cash equivalents	$ 0			$ 0
Accounts receivable—trade, less allowance for doubtful accounts	0			0
Inventories, at lower of cost or market	0			0
Prepaid expenses and other current assets	0			0
Total current assets	0			0
Property, plant and equipment, at cost less accumulated depreciation and amortization	0			0
Investments in subsidiaries	(3,060.3)			(2,735.7)
Other assets	0			0
Total assets	(3,060.3)			(2,735.7)
Current liabilities
Current maturities of long-term debt	0			0
Inter-company accounts payable	0			0
Trade accounts payable and accrued liabilities	0			0
Income taxes payable	0
Total current liabilities	0			0
Long-term debt, including capitalized lease obligations	0			0
Deferred income taxes	0			0
Asset retirement obligations	0			0
Deferred credits and other liabilities	0			0
Total liabilities	0			0
Stockholders' Equity
Preferred Stock	0			0
Common Stock	(0.1)			(0.1)
Treasury Stock	0			0
Additional paid in capital (APIC)	(1,368.4)			(1,368.4)
Retained earnings	(1,691.8)			(1,367.2)
Accumulated other comprehensive income (loss) (AOCI)	0			0
Total stockholders' equity	(3,060.3)			(2,735.7)
Total liabilities and stockholders' equity	(3,060.3)			(2,735.7)
Parent Company | Reportable Legal Entities
Current assets
Cash and cash equivalents	0			0
Accounts receivable—trade, less allowance for doubtful accounts	0			0
Inventories, at lower of cost or market	0			0
Prepaid expenses and other current assets	0			0
Total current assets	0			0
Property, plant and equipment, at cost less accumulated depreciation and amortization	0			0
Investments in subsidiaries	2,916.9			2,591.8
Other assets	0			0
Total assets	2,916.9			2,591.8
Current liabilities
Current maturities of long-term debt	0			0
Inter-company accounts payable	230.9			(0.1)
Trade accounts payable and accrued liabilities	0			0
Income taxes payable	0
Total current liabilities	230.9			(0.1)
Long-term debt, including capitalized lease obligations	0			0
Deferred income taxes	0			0
Asset retirement obligations	0			0
Deferred credits and other liabilities	0			0
Total liabilities	230.9			(0.1)
Stockholders' Equity
Preferred Stock	0			0
Common Stock	0.5			0.5
Treasury Stock	(1,321.8)			(1,099.8)
Additional paid in capital (APIC)	1,179.8			1,188.8
Retained earnings	2,827.5			2,502.4
Accumulated other comprehensive income (loss) (AOCI)	0			0
Total stockholders' equity	2,686			2,591.9
Total liabilities and stockholders' equity	2,916.9			2,591.8
Issuer | Reportable Legal Entities
Current assets
Cash and cash equivalents	315.8			279.4
Accounts receivable—trade, less allowance for doubtful accounts	142.6			173
Inventories, at lower of cost or market	268.1			227.6
Prepaid expenses and other current assets	14.8			29.6
Total current assets	741.3			709.6
Property, plant and equipment, at cost less accumulated depreciation and amortization	1,842.8			1,799.1
Investments in subsidiaries	143.4			143.9
Other assets	191			169.1
Total assets	2,918.5			2,821.7
Current liabilities
Current maturities of long-term debt	51.2			38.8
Inter-company accounts payable	(39.2)			196.1
Trade accounts payable and accrued liabilities	442.5			466.2
Income taxes payable	19.8
Total current liabilities	474.3			701.1
Long-term debt, including capitalized lease obligations	963.2			999.3
Deferred income taxes	217.5			216.7
Asset retirement obligations	34			32.8
Deferred credits and other liabilities	164.4			130.4
Total liabilities	1,853.4			2,080.3
Stockholders' Equity
Preferred Stock	0			0
Common Stock	0			0
Treasury Stock	0			0
Additional paid in capital (APIC)	579.1			578.8
Retained earnings	488.1			161.9
Accumulated other comprehensive income (loss) (AOCI)	(2.1)			0.7
Total stockholders' equity	1,065.1			741.4
Total liabilities and stockholders' equity	2,918.5			2,821.7
Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	1.7			0.9
Accounts receivable—trade, less allowance for doubtful accounts	0.1			(0.1)
Inventories, at lower of cost or market	0			0
Prepaid expenses and other current assets	0.1			0.4
Total current assets	1.9			1.2
Property, plant and equipment, at cost less accumulated depreciation and amortization	11.2			8.2
Investments in subsidiaries	0			0
Other assets	0			0
Total assets	13.1			9.4
Current liabilities
Current maturities of long-term debt	0			0
Inter-company accounts payable	(37.4)			(41.7)
Trade accounts payable and accrued liabilities	0.3			0
Income taxes payable	(0.4)
Total current liabilities	(37.5)			(41.7)
Long-term debt, including capitalized lease obligations	0			0
Deferred income taxes	0			0
Asset retirement obligations	0			0
Deferred credits and other liabilities	0			0
Total liabilities	(37.5)			(41.7)
Stockholders' Equity
Preferred Stock	0			0
Common Stock	0.1			0.1
Treasury Stock	0			0
Additional paid in capital (APIC)	52			52
Retained earnings	(1.5)			(1)
Accumulated other comprehensive income (loss) (AOCI)	0			0
Total stockholders' equity	50.6			51.1
Total liabilities and stockholders' equity	13.1			9.4
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	0			0
Accounts receivable—trade, less allowance for doubtful accounts	0			0
Inventories, at lower of cost or market	0			0
Prepaid expenses and other current assets	0			0
Total current assets	0			0
Property, plant and equipment, at cost less accumulated depreciation and amortization	0			0
Investments in subsidiaries	0			0
Other assets	0			0
Total assets	0			0
Current liabilities
Current maturities of long-term debt	0			0
Inter-company accounts payable	(154.3)			(154.3)
Trade accounts payable and accrued liabilities	0			0
Income taxes payable	0
Total current liabilities	(154.3)			(154.3)
Long-term debt, including capitalized lease obligations	0			0
Deferred income taxes	0			0
Asset retirement obligations	0			0
Deferred credits and other liabilities	0			0
Total liabilities	(154.3)			(154.3)
Stockholders' Equity
Preferred Stock	0			0
Common Stock	0			0
Treasury Stock	0			0
Additional paid in capital (APIC)	87.5			87.5
Retained earnings	66.8			66.8
Accumulated other comprehensive income (loss) (AOCI)	0			0
Total stockholders' equity	154.3			154.3
Total liabilities and stockholders' equity	$ 0			$ 0

Guarantor Subsidiaries (Conso_2

Guarantor Subsidiaries (Consolidating Balance Sheet 2) (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2013
Guarantor Subsidiaries [Abstract]
Allowance for doubtful accounts	$ 0.1	$ 1.2
Property, plant and equipment, accumulated depreciation and amortization	$ 1,151.3	$ 1,079.2
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	$ 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)	18,199,448	16,307,048

Guarantor Subsidiaries (Conso_3

Guarantor Subsidiaries (Consolidating Income Statement and Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended		12 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Revenues
Total operating revenues		$ 2,839			$ 3,657.6			$ 8,403.4	$ 10,574.4
Operating Expenses
Depreciation and amortization		40.6			37.6			119.5	113.8
Selling, general and administrative		53.7			36			130	105.7
Accretion of asset retirement obligations		0.6			0.6			1.7	1.6	$ 2.1
Total operating expenses		2,738.7			3,537.1			7,938.2	10,379.6
Net settlement proceeds		0			0			0	0.1
Gain (loss) on sale of assets		0			0.2			1.4	0.1
Income (loss) from operations		100.3			120.7			466.6	195
Other income (expense)
Interest income		0			0.8			1	2.4
Interest expense		(12.4)			(15.3)			(38.7)	(42.1)
Loss on early debt extinguishment		0			(14.8)			0	(14.8)
Other nonoperating income (expense)		0.2			(0.1)			(0.5)	0
Total other income (expense)		(12.2)			(29.4)			(38.2)	(54.5)
Income (loss) before income taxes		88.1			91.3			428.4	140.5
Income tax expense (benefit)		21.2			22.1			103.3	33.3
Income (loss)		66.9			69.2			325.1	107.2
Equity earnings in affiliates, net of tax		0			0			0	0
Net Income		66.9	$ 168.9	$ 89.3	69.2	$ 32.7	$ 5.3	325.1	107.2
Other comprehensive income (loss)		0.4			0			(2.8)	0
Comprehensive income		67.3			69.2			322.3	107.2
Eliminations
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Depreciation and amortization		0			0			0	0
Selling, general and administrative		0			0			0	0
Accretion of asset retirement obligations		0			0			0	0
Total operating expenses		0			0			0	0
Net settlement proceeds		0			0				0
Gain (loss) on sale of assets		0			0			0	0
Income (loss) from operations		0			0			0	0
Other income (expense)
Interest income		0			0			0	0
Interest expense		0			0			0	0
Loss on early debt extinguishment					0			0	0
Other nonoperating income (expense)		0			0			0	0
Total other income (expense)		0			0			0	0
Income (loss) before income taxes		0			0			0	0
Income tax expense (benefit)		0			0			0	0
Income (loss)		0			0			0	0
Equity earnings in affiliates, net of tax		(66.7)			(69.1)			(324.6)	(106.8)
Net Income		(66.7)			(69.1)			(324.6)	(106.8)
Other comprehensive income (loss)		0			0			0	0
Comprehensive income		(66.7)			(69.1)			(324.6)	(106.8)
Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Depreciation and amortization		0			0			0	0
Selling, general and administrative		0			0			0	0
Accretion of asset retirement obligations		0			0			0	0
Total operating expenses		0			0			0	0
Net settlement proceeds		0			0				0
Gain (loss) on sale of assets		0			0			0	0
Income (loss) from operations		0			0			0	0
Other income (expense)
Interest income		0			0			0	0
Interest expense		0			0			0	0
Loss on early debt extinguishment					0			0	0
Other nonoperating income (expense)		0			0			0	0
Total other income (expense)		0			0			0	0
Income (loss) before income taxes		0			0			0	0
Income tax expense (benefit)		0			0			0	0
Income (loss)		0			0			0	0
Equity earnings in affiliates, net of tax		66.9			69.2			325.1	107.2
Net Income		66.9			69.2			325.1	107.2
Other comprehensive income (loss)		0			0			0	0
Comprehensive income		66.9			69.2			325.1	107.2
Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		2,838.9			3,657.6			8,403.3	10,574.4
Operating Expenses
Depreciation and amortization		40.5			37.6			119.3	113.8
Selling, general and administrative		53.7			36			130	105.7
Accretion of asset retirement obligations		0.6			0.6			1.7	1.6
Total operating expenses		2,738.5			3,537.1			7,937.9	10,379.6
Net settlement proceeds		0			0				0.1
Gain (loss) on sale of assets		0			0.2			1.4	0.1
Income (loss) from operations		100.4			120.7			466.8	195
Other income (expense)
Interest income		0			0.8			1	2.4
Interest expense		(12.4)			(15.3)			(38.7)	(42.1)
Loss on early debt extinguishment					(14.8)			0	(14.8)
Other nonoperating income (expense)		0.4			0			0	0.5
Total other income (expense)		(12)			(29.3)			(37.7)	(54)
Income (loss) before income taxes		88.4			91.4			429.1	141
Income tax expense (benefit)		21.3			22.1			103.5	33.4
Income (loss)		67.1			69.3			325.6	107.6
Equity earnings in affiliates, net of tax		(0.2)			(0.1)			(0.5)	(0.4)
Net Income		66.9			69.2			325.1	107.2
Other comprehensive income (loss)		0.4			0			(2.8)	0
Comprehensive income		67.3			69.2			322.3	107.2
Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.1			0			0.1	0
Operating Expenses
Depreciation and amortization		0.1			0			0.2	0
Selling, general and administrative		0			0			0	0
Accretion of asset retirement obligations		0			0			0	0
Total operating expenses		0.2			0			0.3	0
Net settlement proceeds		0			0				0
Gain (loss) on sale of assets		0			0			0	0
Income (loss) from operations		(0.1)			0			(0.2)	0
Other income (expense)
Interest income		0			0			0	0
Interest expense		0			0			0	0
Loss on early debt extinguishment					0			0	0
Other nonoperating income (expense)		(0.2)			(0.1)			(0.5)	(0.5)
Total other income (expense)		(0.2)			(0.1)			(0.5)	(0.5)
Income (loss) before income taxes		(0.3)			(0.1)			(0.7)	(0.5)
Income tax expense (benefit)		(0.1)			0			(0.2)	(0.1)
Income (loss)		(0.2)			(0.1)			(0.5)	(0.4)
Equity earnings in affiliates, net of tax		0			0			0	0
Net Income		(0.2)			(0.1)			(0.5)	(0.4)
Other comprehensive income (loss)		0			0			0	0
Comprehensive income		(0.2)			(0.1)			(0.5)	(0.4)
Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Depreciation and amortization		0			0			0	0
Selling, general and administrative		0			0			0	0
Accretion of asset retirement obligations		0			0			0	0
Total operating expenses		0			0			0	0
Net settlement proceeds		0			0				0
Gain (loss) on sale of assets		0			0			0	0
Income (loss) from operations		0			0			0	0
Other income (expense)
Interest income		0			0			0	0
Interest expense		0			0			0	0
Loss on early debt extinguishment					0			0	0
Other nonoperating income (expense)		0			0			0	0
Total other income (expense)		0			0			0	0
Income (loss) before income taxes		0			0			0	0
Income tax expense (benefit)		0			0			0	0
Income (loss)		0			0			0	0
Equity earnings in affiliates, net of tax		0			0			0	0
Net Income		0			0			0	0
Other comprehensive income (loss)		0			0			0	0
Comprehensive income		0			0			0	0
Product
Operating Revenues
Total operating revenues	[1]	2,056			2,965.5			6,125.1	8,595
Operating Expenses
Operating expenses	[1]	1,862.2			2,749.6			5,409.8	8,104.8
Product | Eliminations
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Product | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Product | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		2,056			2,965.5			6,125.1	8,595
Operating Expenses
Operating expenses		1,862.2			2,749.6			5,409.8	8,104.8
Product | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Product | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Merchandise sales
Operating Revenues
Total operating revenues		756.8			681.1			2,211.4	1,946.1
Operating Expenses
Operating expenses		638.7			569.9			1,867.4	1,631.9
Merchandise sales | Eliminations
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Merchandise sales | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Merchandise sales | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		756.8			681.1			2,211.4	1,946.1
Operating Expenses
Operating expenses		638.7			569.9			1,867.4	1,631.9
Merchandise sales | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Merchandise sales | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Other operating revenues
Operating Revenues
Total operating revenues		26.2			11			66.9	33.3
Operating Expenses
Operating expenses		142.9			143.4			409.8	421.8
Other operating revenues | Eliminations
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Other operating revenues | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		0			0			0	0
Other operating revenues | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		26.1			11			66.8	33.3
Operating Expenses
Operating expenses		142.8			143.4			409.7	421.8
Other operating revenues | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.1			0			0.1	0
Operating Expenses
Operating expenses		0.1			0			0.1	0
Other operating revenues | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0			0			0	0
Operating Expenses
Operating expenses		$ 0			$ 0			$ 0	$ 0
[1]	Includes excise taxes of $447.0 million for the three months ended September 30, 2020, $498.9 million for the three months ended September 30, 2019, $1,300.7 million for the nine months ended September 30, 2020 and $1,452.5 million the nine months ended September 30, 2019.

Guarantor Subsidiaries (Conso_4

Guarantor Subsidiaries (Consolidating Statement of Cash Flow) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Activities
Net income	$ 66.9	$ 168.9	$ 89.3	$ 69.2	$ 32.7	$ 5.3	$ 325.1	$ 107.2
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	40.6			37.6			119.5	113.8
Deferred and noncurrent income tax charges (credits)							1.7	6.9
Accretion of asset retirement obligations	0.6			0.6			1.7	1.6	$ 2.1
(Gain) loss on sale of assets	0			(0.2)			(1.4)	(0.1)
Net (increase) decrease in noncash operating working capital							(2.2)	(3.7)
Equity in earnings of affiliates	0			0			0	0
Loss on early debt extinguishment	0			14.8			0	14.8
Other operating activities - net							23.4	11.1
Net cash provided by (required by) operating activities							467.8	251.6
Investing Activities
Property additions							(169.4)	(153.7)
Proceeds from sale of assets							7.7	2.4
Other investing activities - net							(1.6)	(0.7)
Net cash provided by (required by) investing activities							(163.3)	(152)
Financing Activities
Purchase of treasury stock							(230.5)	(139.1)
Borrowings of debt							0	693.7
Repayments of debt							(26.1)	(573.1)
Debt issuance costs							0	(3.1)
Early debt extinguishment costs							0	(10.4)
Amounts related to share-based compensation							(10.7)	(4.4)
Net distributions to parent							0	0
Net cash provided by (required by) financing activities							(267.3)	(36.4)
Net increase (decrease) in cash, cash equivalents, and restricted cash							37.2	63.2
Cash, cash equivalents, and restricted cash at beginning of period			280.3			184.5	280.3	184.5	184.5
Cash, cash equivalents, and restricted cash at end of period	317.5			247.7			317.5	247.7	280.3
Eliminations
Operating Activities
Net income	(66.7)			(69.1)			(324.6)	(106.8)
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0			0			0	0
Deferred and noncurrent income tax charges (credits)							0	0
Accretion of asset retirement obligations	0			0			0	0
(Gain) loss on sale of assets	0			0			0	0
Net (increase) decrease in noncash operating working capital							0	0
Equity in earnings of affiliates	66.7			69.1			324.6	106.8
Loss on early debt extinguishment				0			0	0
Other operating activities - net							0	0
Net cash provided by (required by) operating activities							0	0
Investing Activities
Property additions							0	0
Proceeds from sale of assets							0	0
Other investing activities - net							0	0
Net cash provided by (required by) investing activities							0	0
Financing Activities
Purchase of treasury stock							0	0
Borrowings of debt							0	0
Repayments of debt							0	0
Debt issuance costs								0
Early debt extinguishment costs								0
Amounts related to share-based compensation							0	0
Net distributions to parent							0	0
Net cash provided by (required by) financing activities							0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash							0	0
Cash, cash equivalents, and restricted cash at beginning of period			0			0	0	0	0
Cash, cash equivalents, and restricted cash at end of period	0			0			0	0	0
Parent Company | Reportable Legal Entities
Operating Activities
Net income	66.9			69.2			325.1	107.2
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0			0			0	0
Deferred and noncurrent income tax charges (credits)							0	0
Accretion of asset retirement obligations	0			0			0	0
(Gain) loss on sale of assets	0			0			0	0
Net (increase) decrease in noncash operating working capital							0	0
Equity in earnings of affiliates	(66.9)			(69.2)			(325.1)	(107.2)
Loss on early debt extinguishment				0			0	0
Other operating activities - net							0	0
Net cash provided by (required by) operating activities							0	0
Investing Activities
Property additions							0	0
Proceeds from sale of assets							0	0
Other investing activities - net							0	0
Net cash provided by (required by) investing activities							0	0
Financing Activities
Purchase of treasury stock							(230.5)	(139.1)
Borrowings of debt							0	0
Repayments of debt							0	0
Debt issuance costs								0
Early debt extinguishment costs								0
Amounts related to share-based compensation							0	0
Net distributions to parent							230.5	139.1
Net cash provided by (required by) financing activities							0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash							0	0
Cash, cash equivalents, and restricted cash at beginning of period			0			0	0	0	0
Cash, cash equivalents, and restricted cash at end of period	0			0			0	0	0
Issuer | Reportable Legal Entities
Operating Activities
Net income	66.9			69.2			325.1	107.2
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	40.5			37.6			119.3	113.8
Deferred and noncurrent income tax charges (credits)							1.7	6.9
Accretion of asset retirement obligations	0.6			0.6			1.7	1.6
(Gain) loss on sale of assets	0			(0.2)			(1.4)	(0.1)
Net (increase) decrease in noncash operating working capital							(2.1)	(3.6)
Equity in earnings of affiliates	0.2			0.1			0.5	0.4
Loss on early debt extinguishment				14.8			0	14.8
Other operating activities - net							23.4	11.1
Net cash provided by (required by) operating activities							468.2	252.1
Investing Activities
Property additions							(166.2)	(149.3)
Proceeds from sale of assets							7.7	2.4
Other investing activities - net							(1.6)	(0.7)
Net cash provided by (required by) investing activities							(160.1)	(147.6)
Financing Activities
Purchase of treasury stock							0	0
Borrowings of debt							0	693.7
Repayments of debt							(26.1)	(573.1)
Debt issuance costs								(3.1)
Early debt extinguishment costs								(10.4)
Amounts related to share-based compensation							(10.7)	(4.4)
Net distributions to parent							(234.9)	(144.3)
Net cash provided by (required by) financing activities							(271.7)	(41.6)
Net increase (decrease) in cash, cash equivalents, and restricted cash							36.4	62.9
Cash, cash equivalents, and restricted cash at beginning of period			279.4			184	279.4	184	184
Cash, cash equivalents, and restricted cash at end of period	315.8			246.9			315.8	246.9	279.4
Guarantor Subsidiaries | Reportable Legal Entities
Operating Activities
Net income	(0.2)			(0.1)			(0.5)	(0.4)
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0.1			0			0.2	0
Deferred and noncurrent income tax charges (credits)							0	0
Accretion of asset retirement obligations	0			0			0	0
(Gain) loss on sale of assets	0			0			0	0
Net (increase) decrease in noncash operating working capital							(0.1)	(0.1)
Equity in earnings of affiliates	0			0			0	0
Loss on early debt extinguishment				0			0	0
Other operating activities - net							0	0
Net cash provided by (required by) operating activities							(0.4)	(0.5)
Investing Activities
Property additions							(3.2)	(4.4)
Proceeds from sale of assets							0	0
Other investing activities - net							0	0
Net cash provided by (required by) investing activities							(3.2)	(4.4)
Financing Activities
Purchase of treasury stock							0	0
Borrowings of debt							0	0
Repayments of debt							0	0
Debt issuance costs								0
Early debt extinguishment costs								0
Amounts related to share-based compensation							0	0
Net distributions to parent							4.4	5.2
Net cash provided by (required by) financing activities							4.4	5.2
Net increase (decrease) in cash, cash equivalents, and restricted cash							0.8	0.3
Cash, cash equivalents, and restricted cash at beginning of period			0.9			0.5	0.9	0.5	0.5
Cash, cash equivalents, and restricted cash at end of period	1.7			0.8			1.7	0.8	0.9
Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Activities
Net income	0			0			0	0
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0			0			0	0
Deferred and noncurrent income tax charges (credits)							0	0
Accretion of asset retirement obligations	0			0			0	0
(Gain) loss on sale of assets	0			0			0	0
Net (increase) decrease in noncash operating working capital							0	0
Equity in earnings of affiliates	0			0			0	0
Loss on early debt extinguishment				0			0	0
Other operating activities - net							0	0
Net cash provided by (required by) operating activities							0	0
Investing Activities
Property additions							0	0
Proceeds from sale of assets							0	0
Other investing activities - net							0	0
Net cash provided by (required by) investing activities							0	0
Financing Activities
Purchase of treasury stock							0	0
Borrowings of debt							0	0
Repayments of debt							0	0
Debt issuance costs								0
Early debt extinguishment costs								0
Amounts related to share-based compensation							0	0
Net distributions to parent							0	0
Net cash provided by (required by) financing activities							0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash							0	0
Cash, cash equivalents, and restricted cash at beginning of period			$ 0			$ 0	0	0	0
Cash, cash equivalents, and restricted cash at end of period	$ 0			$ 0			$ 0	$ 0	$ 0

Guarantor Subsidiaries (Conso_5

Guarantor Subsidiaries (Consolidating Statement of Changes In Equity) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 918,000	$ 746,800	$ 803,000	$ 816,300	$ 797,800	$ 807,300	$ 803,000	$ 807,300
Issuance of treasury stock	0		(500)	0	0	0
Repurchase of treasury stock	(89,900)	0	(140,600)	(109,000)	(16,800)	(13,300)
Amounts related to share-based compensation	(5,100)	0	(5,600)	(100)	(200)	(4,100)
Share-based compensation expense	5,400	2,800	2,800	2,600	2,800	2,600
Net income	66,900	168,900	89,300	69,200	32,700	5,300	325,100	107,200
Ending balance	895,700	918,000	746,800	779,000	816,300	797,800	895,700	779,000
Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,100				1,100
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	500	500	500	500	500	500	500	500
Issuance of common stock	0	0	0	0	0	0
Ending balance	500	500	500	500	500	500	500	500
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,235,200)	(1,235,200)	(1,099,800)	(964,700)	(948,000)	(940,300)	(1,099,800)	(940,300)
Issuance of treasury stock	3,300	0	5,200	500	100	5,600
Repurchase of treasury stock	(89,900)	0	(140,600)	(109,000)	(16,800)	(13,300)
Ending balance	(1,321,800)	(1,235,200)	(1,235,200)	(1,073,200)	(964,700)	(948,000)	(1,321,800)	(1,073,200)
APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	533,000	530,200	538,700	534,400	531,900	539,000	538,700	539,000
Issuance of treasury stock	(3,300)	0	(5,700)	(500)	(100)	(5,600)
Amounts related to share-based compensation	(5,100)	0	(5,600)	(100)	(200)	(4,100)
Share-based compensation expense	5,400	2,800	2,800	2,600	2,800	2,600
Ending balance	530,000	533,000	530,200	536,400	534,400	531,900	530,000	536,400
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,622,200	1,453,300	1,362,900	1,246,100	1,213,400	1,208,100	1,362,900	1,208,100
Net income	66,900	168,900	89,300	69,200	32,700	5,300
Ending balance	1,689,100	1,622,200	1,453,300	1,315,300	1,246,100	1,213,400	1,689,100	1,315,300
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,100				1,100
AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,500)	(2,000)	700	0	0	0	700	0
Other comprehensive income (loss)			(2,700)	0	0	0
Net income	400	(500)
Ending balance	(2,100)	(2,500)	(2,000)	0	0	0	(2,100)	0
Eliminations
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(2,735,700)				(2,735,700)
Net income	(66,700)			(69,100)			(324,600)	(106,800)
Ending balance	(3,060,300)						(3,060,300)
Eliminations | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(100)	(100)	(100)	(100)	(100)	(100)	(100)	(100)
Ending balance	(100)	(100)	(100)	(100)	(100)	(100)	(100)	(100)
Eliminations | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Eliminations | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)
Ending balance	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)	(1,368,400)
Eliminations | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,625,100)	(1,456,400)	(1,367,200)	(1,250,600)	(1,218,000)	(1,212,900)	(1,367,200)	(1,212,900)
Net income	(66,700)	(168,700)	(89,200)	(69,100)	(32,600)	(5,100)
Ending balance	(1,691,800)	(1,625,100)	(1,456,400)	(1,319,700)	(1,250,600)	(1,218,000)	(1,691,800)	(1,319,700)
Eliminations | AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Parent Company | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			2,591,900				2,591,900
Net income	66,900			69,200			325,100	107,200
Ending balance	2,686,000						2,686,000
Parent Company | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	500	500	500	500	500	500	500	500
Ending balance	500	500	500	500	500	500	500	500
Parent Company | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,235,200)	(1,235,200)	(1,099,800)	(964,700)	(948,000)	(940,300)	(1,099,800)	(940,300)
Issuance of treasury stock	3,300	0	5,200	500	100	5,600
Repurchase of treasury stock	(89,900)	0	(140,600)	(109,000)	(16,800)	(13,300)
Ending balance	(1,321,800)	(1,235,200)	(1,235,200)	(1,073,200)	(964,700)	(948,000)	(1,321,800)	(1,073,200)
Parent Company | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,183,100	1,183,100	1,188,800	1,189,400	1,189,500	1,195,100	1,188,800	1,195,100
Issuance of treasury stock	(3,300)	0	(5,700)	(500)	(100)	(5,600)
Ending balance	1,179,800	1,183,100	1,183,100	1,188,900	1,189,400	1,189,500	1,179,800	1,188,900
Parent Company | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,760,600	2,591,700	2,502,400	2,219,800	2,187,100	2,181,800	2,502,400	2,181,800
Net income	66,900	168,900	89,300	69,200	32,700	5,300
Ending balance	2,827,500	2,760,600	2,591,700	2,289,000	2,219,800	2,187,100	2,827,500	2,289,000
Parent Company | Reportable Legal Entities | AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Issuer | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			741,400				741,400
Net income	66,900			69,200			325,100	107,200
Ending balance	1,065,100						1,065,100
Issuer | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Issuer | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Issuer | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	578,800	576,000	578,800	573,900	571,300	572,800	578,800	572,800
Amounts related to share-based compensation	(5,100)	0	(5,600)	(100)	(200)	(4,100)
Share-based compensation expense	5,400	2,800	2,800	2,600	2,800	2,600
Ending balance	579,100	578,800	576,000	576,400	573,900	571,300	579,100	576,400
Issuer | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	421,200	252,300	161,900	210,900	178,200	172,900	161,900	172,900
Net income	66,900	168,900	89,300	69,200	32,700	5,300
Ending balance	488,100	421,200	252,300	280,100	210,900	178,200	488,100	280,100
Issuer | Reportable Legal Entities | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,100				1,100
Issuer | Reportable Legal Entities | AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,500)	(2,000)	700	0	0	0	700	0
Other comprehensive income (loss)			(2,700)
Net income		(500)
Ending balance	(2,100)	(2,500)	(2,000)	0	0	0	(2,100)	0
Guarantor Subsidiaries | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			51,100				51,100
Net income	(200)			(100)			(500)	(400)
Ending balance	50,600						50,600
Guarantor Subsidiaries | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	100	100	100	100	100	100	100	100
Ending balance	100	100	100	100	100	100	100	100
Guarantor Subsidiaries | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Guarantor Subsidiaries | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	52,000	52,000	52,000	52,000	52,000	52,000	52,000	52,000
Ending balance	52,000	52,000	52,000	52,000	52,000	52,000	52,000	52,000
Guarantor Subsidiaries | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,300)	(1,100)	(1,000)	(800)	(700)	(500)	(1,000)	(500)
Net income	(200)	(200)	(100)	(100)	(100)	(200)
Ending balance	(1,500)	(1,300)	(1,100)	(900)	(800)	(700)	(1,500)	(900)
Guarantor Subsidiaries | Reportable Legal Entities | AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Non-Guarantor Subsidiaries | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			154,300				154,300
Net income	0			0			0	0
Ending balance	154,300						154,300
Non-Guarantor Subsidiaries | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Non-Guarantor Subsidiaries | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	0	0	0	0	0	0	0	0
Non-Guarantor Subsidiaries | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	87,500	87,500	87,500	87,500	87,500	87,500	87,500	87,500
Ending balance	87,500	87,500	87,500	87,500	87,500	87,500	87,500	87,500
Non-Guarantor Subsidiaries | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	66,800	66,800	66,800	66,800	66,800	66,800	66,800	66,800
Ending balance	66,800	66,800	66,800	66,800	66,800	66,800	66,800	66,800
Non-Guarantor Subsidiaries | Reportable Legal Entities | AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0
Ending balance	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0