Murphy USA (MUSA) 10-Q 1 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	3 Months Ended
	Mar. 31, 2019shares
Document And Entity Information [Abstract]
Entity Registrant Name	Murphy USA Inc.
Trading Symbol	MUSA
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Entity Central Index Key	0001573516
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Common Stock, Shares Outstanding	32,170,405

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 180.4	$ 184.5	$ 144.1	$ 170
Accounts receivable—trade, less allowance for doubtful accounts of $1.1 in 2019 and in 2018	227.3	138.8
Inventories, at lower of cost or market	178.7	221.5
Prepaid expenses and other current assets	26.5	25.3
Total current assets	612.9	570.1
Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,013.3 in 2019 and $974.2 in 2018	1,738.1	1,748.2
Other assets	153.4	42.5
Total assets	2,504.4	2,360.8
Current liabilities
Current maturities of long-term debt	21.3	21.2
Trade accounts payable and accrued liabilities	512	456.9
Total current liabilities	533.3	478.1
Long-term debt, including capitalized lease obligations	838	842.1
Deferred income taxes	189.8	192.2
Asset retirement obligations	31.2	30.7
Deferred credits and other liabilities	114.3	10.4
Total liabilities	1,706.6	1,553.5
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 2019 and 2018, respectively)	0.5	0.5
Treasury stock (14,569,759 and 14,505,681 shares held at 2019 and 2018, respectively)	(948)	(940.3)
Additional paid in capital (APIC)	531.9	539
Retained earnings	1,213.4	1,208.1
Total stockholders' equity	797.8	807.3	$ 705.3	$ 738.4
Total liabilities and stockholders' equity	$ 2,504.4	$ 2,360.8

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1.1	$ 1.1
Property, plant and equipment, accumulated depreciation and amortization	$ 1,013.3	$ 974.2
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)	14,596,759	14,505,681

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Operating Revenues
Total operating revenues		$ 3,116.4	$ 3,244.2
Operating Expenses
Depreciation and amortization		39.7	31.8
Selling, general and administrative		34.6	34.5
Accretion of asset retirement obligations		0.5	0.5
Total operating expenses		3,097.8	3,231.5
Net settlement proceeds		0.1	47
Gain (loss) on sale of assets		(0.1)	0.3
Income (loss) from operations		18.6	60
Other income (expense)
Interest income		0.7	0.3
Interest expense		(13.6)	(13)
Other nonoperating income (expense)		0.2	0
Total other income (expense)		(12.7)	(12.7)
Income (loss) before income taxes		5.9	47.3
Income tax expense (benefit)		0.6	8
Net Income (Loss)		$ 5.3	$ 39.3
Basic and Diluted Earnings Per Common Share
Basic (in dollars per share)		$ 0.16	$ 1.17
Diluted (in dollars per share)		$ 0.16	$ 1.16
Weighted-Average Common Shares Outstanding:
Basic (in shares)		32,206	33,698
Diluted (in shares)		32,420	34,062
Supplemental information:
Excise taxes		$ 455.3	$ 434.4
Product
Operating Revenues
Total operating revenues	[1]	2,499.8	2,637.6
Operating Expenses
Operating expenses	[1]	2,381.5	2,561.1
Merchandise
Operating Revenues
Total operating revenues		606.2	567.7
Operating Expenses
Operating expenses		508.7	476.2
Other
Operating Revenues
Total operating revenues		10.4	38.9
Operating Expenses
Operating expenses		$ 132.8	$ 127.4
[1]	Three Months EndedMarch 31, Three Months EndedMarch 31,(Millions of dollars, except per share amounts) 2019 2018(a) Includes excise taxes of: $455.3 $434.4

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Operating Activities
Net income (loss)	$ 5.3	$ 39.3
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	39.7	31.8
Deferred and noncurrent income tax charges (credits)	(2.4)	1.1
Accretion of asset retirement obligations	0.5	0.5	$ 2
Pretax (gains) losses from sale of assets	0.1	(0.3)
Net (increase) decrease in noncash operating working capital	1.7	36
Other operating activities - net	3.2	(1)
Net cash provided by (required by) operating activities	48.1	107.4
Investing Activities
Property additions	(30.5)	(48.7)
Proceeds from sale of assets	1.1	1.1
Other investing activities - net	(0.1)	(4.7)
Net cash provided by (required by) investing activities	(29.5)	(52.3)
Financing Activities
Purchase of treasury stock	(13.3)	(71.7)
Repayments of debt	(5.4)	(5.3)
Amounts related to share-based compensation	(4)	(2.9)
Net cash provided by (required by) financing activities	(22.7)	(79.9)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(4.1)	(24.8)
Cash, cash equivalents, and restricted cash at beginning of period	184.5	170	170
Cash, cash equivalents, and restricted cash at end of period	180.4	145.2	184.5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations [Abstract]
Cash and cash equivalents				$ 180.4	$ 184.5	$ 144.1	$ 170
Restricted cash				0	0	1.1	0
Cash, cash equivalents, and restricted cash	$ 184.5	$ 170	$ 170	$ 180.4	$ 184.5	$ 145.2	$ 170

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	APIC	Retained Earnings
Beginning balance at Dec. 31, 2017	$ 738.4	$ 0.5	$ (806.5)	$ 549.9	$ 994.5
Balance (in shares) at Dec. 31, 2017		46,767,164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	39.3				39.3
Purchase of treasury stock	(71.7)		(71.7)
Issuance of treasury stock	0		4.4	(4.4)
Amounts related to share-based compensation	(2.9)			(2.9)
Share-based compensation expense	2.2			2.2
Ending balance at Mar. 31, 2018	705.3	$ 0.5	(873.8)	544.8	1,033.8
Balance (in shares) at Mar. 31, 2018		46,767,164
Beginning balance at Dec. 31, 2018	807.3	$ 0.5	(940.3)	539	1,208.1
Balance (in shares) at Dec. 31, 2018		46,767,164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5.3				5.3
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 at Mar. 31, 2019	$ 797.8	$ 0.5	$ (948)	$ 531.9	$ 1,213.4
Balance (in shares) at Mar. 31, 2019		46,767,164

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2019
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 26 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 March 31, 2019 , Murphy USA had a total of 1,473 Company stations of which 1,160 were Murphy USA and 313 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, 2018 , 2017 and 2016 , 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 19, 2019. Recently Issued Accounting Standards — In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting by recognizing lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under current GAAP. ASU 2016-02 requires that a lessee should recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term on the balance sheet. We adopted ASU 2016-02 as of January 1, 2019, using the modified retrospective approach. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification. We also elected the practical expedient related to land easements, allowing us to carry forward our accounting treatment for land easements on existing agreements. In addition, we elected the hindsight practical expedient to determine the lease term for existing leases. Our election of the hindsight practical expedient resulted in the shortening of lease terms for certain existing leases and the useful lives of corresponding leasehold improvements. In our application of hindsight, we evaluated the performance of the leased stores and the associated markets in relation to our overall real estate strategies, which resulted in the determination that renewal options would not be reasonably certain in determining the expected lease term. Adoption of the new standard resulted in the recording of additional net lease assets and lease liabilities of approximately $110.4 million and $110.7 million , respectively. The standard did not materially impact our consolidated net earnings and had no impact on cash flows. See Note 13 "Lease Accounting" for further details. 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 is effective for the Company on January 1, 2020. Early adoption is permitted. The amendments in this update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently assessing the effect that this ASU will have on our financial position, results of operations, and disclosures but does not expect this update to have a material impact on the Company's consolidated financial statements.

Revenues

Revenues	3 Months Ended
	Mar. 31, 2019
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 disaggregates our revenue by major source for the three months ended March 31, 2019 and 2018 , respectively: Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 2,238.7 $ — $ 2,238.7 $ 2,339.7 $ — $ 2,339.7 Petroleum product sales (at wholesale) 1 261.1 — 261.1 297.9 — 297.9 Total petroleum product sales 2,499.8 — 2,499.8 2,637.6 — 2,637.6 Merchandise sales 606.2 — 606.2 567.7 — 567.7 Other operating revenues: RINs 9.1 — 9.1 37.4 — 37.4 Other revenues 2 1.2 0.1 1.3 1.1 0.4 1.5 Total revenues $ 3,116.3 $ 0.1 $ 3,116.4 $ 3,243.8 $ 0.4 $ 3,244.2 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes 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 to seven days, depending on the terms with the particular credit/debit card providers. Payment fees retained by the credit/debit card providers are recorded as station and other operating expenses. 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. The rewards may be redeemed for merchandise or cash discounts on fuel purchases. The program was rolled out chain-wide in March 2019. Due to the limited nature of the pilot program and the short amount of time the program has been in effect at scale, the deferred revenues recorded in the three months ended March 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 Trade accounts receivable on the balance sheet represents both receivables related to contracts with customers and other trade receivables. At March 31, 2019 and December 31, 2018 , we had $169.9 million and $79.4 million of receivables, respectively, related to contracts with customers recorded. All of the trade accounts receivable related to contracts with customers outstanding at the end of each period were collected during the succeeding quarter. These receivables were generally related to credit and debit card transactions along with short term bulk and wholesale sales from our customers, which have a very short settlement window.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consisted of the following: (Millions of dollars) March 31, December 31, Finished products - First-In, First-Out ("FIFO") basis $ 247.2 $ 219.4 Less: Last-In, First-Out ("LIFO") reserve - finished products (181.3 ) (115.5 ) Finished products - LIFO basis 65.9 103.9 Store merchandise for resale 101.3 107.2 Materials and supplies 11.5 10.4 Total inventories $ 178.7 $ 221.5 At March 31, 2019 and December 31, 2018 , the replacement cost (market value) of LIFO inventories exceeded the LIFO carrying value by $181.3 million and $115.5 million , respectively.

Long-Term Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: (Millions of dollars) March 31, December 31, 6.00% senior notes due 2023 (net of unamortized discount of $3.9 at March 31, 2019 and $4.1 at December 2018) $ 496.1 $ 495.9 5.625% senior notes due 2027 (net of unamortized discount of $3.0 at March 31, 2019 and $3.1 at December 2018) 297.0 296.9 Term loan due 2020 (effective interest rate of 5.052% at March 31, 2019) 67.0 72.0 Capitalized lease obligations, vehicles, due through 2022 2.6 2.3 Less unamortized debt issuance costs (3.4 ) (3.8 ) Total long-term debt 859.3 863.3 Less current maturities 21.3 21.2 Total long-term debt, net of current $ 838.0 $ 842.1 Senior Notes On August 14, 2013, Murphy Oil USA, Inc., our primary operating subsidiary, issued 6.00% Senior Notes due 2023 (the “2023 Senior Notes”) in an aggregate principal amount of $500 million . The 2023 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 2023 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 April 25, 2017, Murphy Oil USA, Inc., 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 are essentially identical to the covenants for the 2023 Senior Notes. The 2023 and 2027 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 2023 and 2027 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 March 2016, we amended and extended our existing credit agreement. The credit agreement provides for a committed $450 million asset-based loan (ABL) facility (with availability subject to the borrowing base described below) and a $200 million term loan facility. It also provides for a $150 million uncommitted incremental facility. On March 10, 2016, Murphy Oil USA, Inc. borrowed $200 million under the term loan facility that has a four -year term with a current outstanding principal of $67 million . As of March 31, 2019 , we have zero outstanding under our ABL facility. 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 product supply/wholesale 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 $200 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 federal funds effective rate 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 , or six months as selected by us in accordance with the terms of the credit agreement. 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 consecutive business days is less than the greater of (a) 17.5% of the lesser of the aggregate ABL facility commitments and the borrowing base and (b) $70 million (including as of the most recent fiscal quarter end on the first date when availability is less than such amount), as well as a maximum secured total debt to EBITDA ratio of 4.5 to 1.0 at any time when term facility commitments or term loans are outstanding. As of March 31, 2019 , our fixed charge coverage ratio was 1.25 . Our secured debt to EBITDA ratio as of March 31, 2019 was 0.16 to 1.0. 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 March 31, 2019 and December 31, 2018 , our ability to make restricted payments was not limited as our fixed charge coverage ratio was greater than 1.0 to 1.0. All obligations under the credit agreement are guaranteed by Murphy USA and the subsidiary guarantors party thereto, and all obligations under the credit agreement, including the guarantees of those obligations, are secured by certain assets of Murphy USA, Murphy Oil USA, Inc. and the guarantors party thereto.

Asset Retirement Obligations (A

Asset Retirement Obligations (ARO)	3 Months Ended
	Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations (ARO)	Asset Retirement Obligations (ARO) The majority of the ARO recognized by the Company at March 31, 2019 and December 31, 2018 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) March 31, December 31, Balance at beginning of period $ 30.7 $ 28.2 Accretion expense 0.5 2.0 Settlements of liabilities — (0.3 ) Liabilities incurred — 0.8 Balance at end of period $ 31.2 $ 30.7 The estimation of future ARO is based on a number of assumptions requiring professional judgment. The Company cannot predict the type of revisions to these assumptions that may be required in future periods due to the lack of availability of additional information.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
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 month periods ended March 31, 2019 and 2018 , the Company’s approximate effective tax rates were as follows: 2019 2018 Three months ended March 31, 10.9% 16.8% The effective tax rate for the three months ended March 31, 2019 was lower than the prior year primarily due to the effects of stock compensation excess tax benefits on a lower pretax income. In the three months ended March 31, 2019 , the Company recognized approximately $0.8 million of excess tax benefits related to stock compensation for employees. For the three months ended March 31, 2018 , the Company recorded benefits from two discrete tax items, which were approximately $0.7 million of excess tax benefits related to stock compensation and a tax benefit of approximately $3.1 million related to the settlement of prior year state uncertain tax positions. The Company was included in Murphy Oil’s tax returns for the periods prior to the separation. The statute of several jurisdictions remains subject to audit by taxing authorities. As of March 31, 2019 , the earliest year remaining open for Federal examination is 2015 and for the states it ranges from 2013 - 2017 . In addition to the pre-separation state returns being open under statute, certain federal and state tax returns post separation are also open under statute for examination. 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	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [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 . On February 6, 2019, the Committee granted nonqualified stock options for 99,400 shares at an exercise price of $76.15 per share under the terms of the MUSA 2013 Plan. The Black-Scholes valuation for these awards is $20.48 per option. The Committee also awarded time-based restricted stock units and performance-based restricted stock units (performance units) to certain employees on the same date. There were 26,550 time-based restricted units granted at a grant date fair value of $76.15 along with 53,100 performance units. 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 16 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 $100.65 per unit. For the ROACE portion of the awards, the valuation will be based on the grant date fair value of $76.15 per unit and the number of awards will be periodically assessed to determine the probability of vesting. On March 26, 2019, the Committee also granted 46,725 time-based restricted stock units granted to certain employees with a grant date fair value of $82.84 per unit. 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. During the first quarter of 2019 , the Company issued 13,086 restricted stock units to its non-employee directors at a grant date fair value of $76.63 per share. These shares vest in three years from the grant date. For the three months ended March 31, 2019 and 2018 , share-based compensation was $2.6 million and $2.2 million , respectively. The income tax benefit realized for the tax deductions from options exercised for the three months ended March 31, 2019 and 2018 was none and $0.1 million , respectively.

Financial Instruments and Risk

Financial Instruments and Risk Management	3 Months Ended
	Mar. 31, 2019
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. 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 creditworthy major financial institutions or over national exchanges such as the New York Mercantile Exchange (“NYMEX”). As of March 31, 2019 , all current derivative activity is immaterial. At March 31, 2019 and December 31, 2018 , cash deposits of $1.5 million and $1.0 million related to commodity derivative contracts were reported in Prepaid expenses and other current assets in the Consolidated Balance Sheets, respectively. These cash deposits have not been used to increase the reported net assets or reduce the reported net liabilities on the derivative contracts at March 31, 2019 or December 31, 2018 , respectively.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2019
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. Upon the completion of the most recent repurchase plan authorized by the Murphy USA Inc. Board of Directors in December 2017, the Company remains committed to share repurchases under quarterly allocations in line with its past practice, subject to market conditions and cash availability. For the three months ended March 31, 2019 , the Company acquired 177,074 shares of common stock for an average price of $74.86 per share including brokerage fees and for the three months ended March 31, 2018, 928,934 shares were repurchased for an average price of $77.18 per share. The following table provides a reconciliation of basic and diluted earnings per share computations for the three months ended March 31, 2019 and 2018 : Three Months Ended (Millions of dollars, except share and per share amounts) 2019 2018 Earnings per common share: Net income per share - basic Net income attributable to common stockholders $ 5.3 $ 39.3 Weighted average common shares outstanding (in thousands) 32,206 33,698 Earnings per common share $ 0.16 $ 1.17 Earnings per common share - assuming dilution: Net income per share - diluted Net income attributable to common stockholders $ 5.3 $ 39.3 Weighted average common shares outstanding (in thousands) 32,206 33,698 Common equivalent shares: Dilutive share-based awards 214 364 Weighted average common shares outstanding - assuming dilution (in thousands) 32,420 34,062 Earnings per common share assuming dilution $ 0.16 $ 1.16 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	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Financial Information	Other Financial Information CASH FLOW DISCLOSURES — Cash income taxes paid (collected), net of refunds, were $0.7 million and $2.6 million for the three month periods ended March 31, 2019 and 2018 , respectively. Interest paid, net of amounts capitalized, was $16.2 million and $15.7 million for the three month periods ended March 31, 2019 and 2018 , respectively. CHANGES IN WORKING CAPITAL: Three Months Ended (Millions of dollars) 2019 2018 Accounts receivable $ (88.5 ) $ 27.2 Inventories 42.7 33.9 Prepaid expenses and other current assets (1.1 ) 8.9 Accounts payable and accrued liabilities 48.6 (35.2 ) Income taxes payable — 1.2 Net (increase) decrease in noncash operating working capital $ 1.7 $ 36.0

Assets and Liabilities Measured

Assets and Liabilities Measured at Fair Value	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 and December 31, 2018 . 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 March 31, 2019 At December 31, 2018 Carrying Carrying (Millions of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt $ (859.3 ) $ (874.5 ) $ (863.3 ) $ (866.7 )

Contingencies

Contingencies	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 , 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 March 31, 2019 . 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 March 31, 2019 , 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 $19.9 million will be sufficient to cover the related liability for all insurance claims and that the ultimate disposition of these claims will have no material effect on the Company’s financial position and results of operations. The Company has obtained insurance coverage as appropriate for the business in which it is engaged, but may incur losses that are not covered by insurance or reserves, in whole or in part, and such losses could adversely affect our results of operations and financial position. TAX MATTERS — Murphy USA is subject to extensive tax liabilities imposed by multiple jurisdictions, including income taxes, indirect taxes (excise/duty, sales/use and gross receipts taxes), payroll taxes, franchise taxes, withholding taxes and ad valorem taxes. New tax laws and regulations and changes in existing tax laws and regulations are continuously being enacted or proposed that could result in increased expenditures for tax liabilities in the future. Many of these liabilities are subject to periodic audits by the respective taxing authority. Subsequent changes to our tax liabilities because of these audits may subject us to interest and penalties. OTHER MATTERS — In the normal course of its business, the Company is required under certain contracts with various governmental authorities and others to provide financial guarantees or letters of credit that may be drawn upon if the Company fails to perform under those contracts. At March 31, 2019 , the Company had contingent liabilities of $16.1 million on outstanding letters of credit. The Company has not accrued a liability in its balance sheet related to these financial guarantees and letters of credit because it is believed that the likelihood of having these drawn is remote.

Lease Accounting

Lease Accounting	3 Months Ended
	Mar. 31, 2019
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 five 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. We lease land for 209 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. 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 Leases are reflected in the following balance sheet accounts: (Millions of dollars) Classification March 31, Assets Operating (Right-of-use) Other Assets $ 110.4 Finance Property, plant, and equipment, at cost, less accumulated depreciation of $1.9 million 3.2 Total leased assets $ 113.6 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 6.3 Finance Current maturities of long-term debt 1.3 Noncurrent Operating Deferred credits and other liabilities 104.4 Finance Long-term debt, including capitalized lease obligations 1.4 Total lease liabilities $ 113.4 Lease Cost: Three Months Ended (Millions of dollars) Classification 2019 Operating lease cost Station and other operating expenses $ 3.5 Finance lease cost Amortization of leased assets Depreciation & amortization expense 0.3 Interest on lease liabilities Interest expense — Net lease costs $ 3.8 Cash flow information: Three Months Ended (Millions of dollars) 2019 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 3.3 Operating cash flows from finance leases $ — Financing cash flows from finance leases $ 0.4 Maturity of Lease Liabilities: (Millions of dollars) Operating leases Finance leases 2019 $ 10.3 $ 1.1 2020 13.5 1.1 2021 12.7 0.6 2022 11.8 0.1 2023 11.2 — After 2023 130.1 — Total lease payments 189.6 2.9 less: interest 78.9 0.2 Present value of lease liabilities $ 110.7 $ 2.7 The Company adopted ASU 2016-02 on January 1, 2019, and as required, the following disclosure is provided for periods prior to adoption. Future annual minimum lease payments and capital lease commitments as of December 31, 2018 were as follows: (Millions of dollars) Operating leases Capital leases 2019 $ 13.7 $ 1.5 2020 13.3 1.1 2021 12.5 0.6 2022 11.7 0.1 2023 11.1 — After 2023 122.6 — Total lease payments 184.9 3.3 less: interest — 0.2 Present value of minimum payments $ 184.9 $ 3.1 Lease Term and Discount Rate: Three Months Ended 2019 Weighted average remaining lease term (years) Finance leases 2.2 Operating leases 15.4 Weighted average discount rate Finance leases 4.8 % Operating leases 6.1 %
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 five 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. We lease land for 209 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. 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 Leases are reflected in the following balance sheet accounts: (Millions of dollars) Classification March 31, Assets Operating (Right-of-use) Other Assets $ 110.4 Finance Property, plant, and equipment, at cost, less accumulated depreciation of $1.9 million 3.2 Total leased assets $ 113.6 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 6.3 Finance Current maturities of long-term debt 1.3 Noncurrent Operating Deferred credits and other liabilities 104.4 Finance Long-term debt, including capitalized lease obligations 1.4 Total lease liabilities $ 113.4 Lease Cost: Three Months Ended (Millions of dollars) Classification 2019 Operating lease cost Station and other operating expenses $ 3.5 Finance lease cost Amortization of leased assets Depreciation & amortization expense 0.3 Interest on lease liabilities Interest expense — Net lease costs $ 3.8 Cash flow information: Three Months Ended (Millions of dollars) 2019 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 3.3 Operating cash flows from finance leases $ — Financing cash flows from finance leases $ 0.4 Maturity of Lease Liabilities: (Millions of dollars) Operating leases Finance leases 2019 $ 10.3 $ 1.1 2020 13.5 1.1 2021 12.7 0.6 2022 11.8 0.1 2023 11.2 — After 2023 130.1 — Total lease payments 189.6 2.9 less: interest 78.9 0.2 Present value of lease liabilities $ 110.7 $ 2.7 The Company adopted ASU 2016-02 on January 1, 2019, and as required, the following disclosure is provided for periods prior to adoption. Future annual minimum lease payments and capital lease commitments as of December 31, 2018 were as follows: (Millions of dollars) Operating leases Capital leases 2019 $ 13.7 $ 1.5 2020 13.3 1.1 2021 12.5 0.6 2022 11.7 0.1 2023 11.1 — After 2023 122.6 — Total lease payments 184.9 3.3 less: interest — 0.2 Present value of minimum payments $ 184.9 $ 3.1 Lease Term and Discount Rate: Three Months Ended 2019 Weighted average remaining lease term (years) Finance leases 2.2 Operating leases 15.4 Weighted average discount rate Finance leases 4.8 % Operating leases 6.1 %

Business Segment

Business Segment	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Business Segment	Business Segment The Company's operations have one operating 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 March 31, 2019 March 31, 2018 Total Assets at External Income External Income (Millions of dollars) March 31, 2019 Revenues (Loss) Revenues (Loss) Marketing $ 2,155.4 $ 3,116.3 $ 16.2 $ 3,243.8 $ 10.7 Corporate and other assets 349.0 0.1 (10.9 ) 0.4 28.6 Total $ 2,504.4 $ 3,116.4 $ 5.3 $ 3,244.2 $ 39.3

Guarantor Subsidiaries

Guarantor Subsidiaries	3 Months Ended
	Mar. 31, 2019
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 the Company, including the 6.00% senior notes due 2023 and the 5.625% senior notes due 2027. 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) March 31, 2019 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 Accounts receivable—trade, less allowance for doubtful accounts of $1.1 in 2019 — 227.3 — — — 227.3 Inventories, at lower of cost or market — 178.7 — — — 178.7 Prepaid expenses and other current assets — 26.3 0.2 — — 26.5 Total current assets — 612.2 0.7 — — 612.9 Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,013.3 in 2019 — 1,734.1 4.0 — — 1,738.1 Investments in subsidiaries 2,442.3 144.2 — — (2,586.5 ) — Other assets — 153.4 — — — 153.4 Total assets $ 2,442.3 $ 2,643.9 $ 4.7 $ — $ (2,586.5 ) $ 2,504.4 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 21.3 $ — $ — $ — $ 21.3 Inter-company accounts payable 13.2 187.8 (46.7 ) (154.3 ) — — Trade accounts payable and accrued liabilities — 512.0 — — — 512.0 Total current liabilities 13.2 721.1 (46.7 ) (154.3 ) — 533.3 Long-term debt, including capitalized lease obligations — 838.0 — — — 838.0 Deferred income taxes — 189.8 — — — 189.8 Asset retirement obligations — 31.2 — — — 31.2 Deferred credits and other liabilities — 114.3 — — — 114.3 Total liabilities 13.2 1,894.4 (46.7 ) (154.3 ) — 1,706.6 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 March 31, 2019) 0.5 — 0.1 — (0.1 ) 0.5 Treasury Stock (14,596,759 shares held at March 31, 2019) (948.0 ) — — — — (948.0 ) Additional paid in capital (APIC) 1,189.5 571.3 52.0 87.5 (1,368.4 ) 531.9 Retained earnings 2,187.1 178.2 (0.7 ) 66.8 (1,218.0 ) 1,213.4 Total stockholders' equity 2,429.1 749.5 51.4 154.3 (2,586.5 ) 797.8 Total liabilities and stockholders' equity $ 2,442.3 $ 2,643.9 $ 4.7 $ — $ (2,586.5 ) $ 2,504.4 CONSOLIDATING BALANCE SHEET (Millions of dollars, except share amounts) December 31, 2018 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 184.0 $ 0.5 $ — $ — $ 184.5 Accounts receivable—trade, less allowance for doubtful accounts of $1.1 in 2018 — 138.8 — — — 138.8 Inventories, at lower of cost or market — 221.5 — — — 221.5 Prepaid expenses and other current assets — 25.1 0.2 — — 25.3 Total current assets — 569.4 0.7 — — 570.1 Property, plant and equipment, at cost less accumulated depreciation and amortization of $974.2 in 2018 — 1,745.9 2.3 — — 1,748.2 Investments in subsidiaries 2,437.0 144.4 — — (2,581.4 ) — Other assets — 42.5 — — — 42.5 Total assets $ 2,437.0 $ 2,502.2 $ 3.0 $ — $ (2,581.4 ) $ 2,360.8 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 21.2 $ — $ — $ — $ 21.2 Inter-company accounts payable (0.1 ) 203.0 (48.6 ) (154.3 ) — — Trade accounts payable and accrued liabilities — 456.9 — — — 456.9 Total current liabilities (0.1 ) 681.1 (48.6 ) (154.3 ) — 478.1 Long-term debt, including capitalized lease obligations — 842.1 — — — 842.1 Deferred income taxes — 192.2 — — — 192.2 Asset retirement obligations — 30.7 — — — 30.7 Deferred credits and other liabilities — 10.4 — — — 10.4 Total liabilities (0.1 ) 1,756.5 (48.6 ) (154.3 ) — 1,553.5 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 December 31, 2018) 0.5 — 0.1 — (0.1 ) 0.5 Treasury Stock (14,505,681 shares held at December 31, 2018) (940.3 ) — — — — (940.3 ) Additional paid in capital (APIC) 1,195.1 572.8 52.0 87.5 (1,368.4 ) 539.0 Retained earnings 2,181.8 172.9 (0.5 ) 66.8 (1,212.9 ) 1,208.1 Total stockholders' equity 2,437.1 745.7 51.6 154.3 (2,581.4 ) 807.3 Total liabilities and stockholders' equity $ 2,437.0 $ 2,502.2 $ 3.0 $ — $ (2,581.4 ) $ 2,360.8 CONSOLIDATING INCOME STATEMENT (Millions of dollars) Three Months Ended March 31, 2019 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,499.8 $ — $ — $ — $ 2,499.8 Merchandise sales — 606.2 — — — 606.2 Other operating revenues — 10.4 — — — 10.4 Total operating revenues — 3,116.4 — — — 3,116.4 Operating Expenses Petroleum product cost of goods sold — 2,381.5 — — — 2,381.5 Merchandise cost of goods sold — 508.7 — — — 508.7 Station and other operating expenses — 132.8 — — — 132.8 Depreciation and amortization — 39.7 — — — 39.7 Selling, general and administrative — 34.6 — — — 34.6 Accretion of asset retirement obligations — 0.5 — — — 0.5 Total operating expenses — 3,097.8 — — — 3,097.8 Net settlement proceeds — 0.1 — — — 0.1 Gain (loss) on sale of assets — (0.1 ) — — — (0.1 ) Income (loss) from operations — 18.6 — — — 18.6 Other income (expense) Interest income — 0.7 — — — 0.7 Interest expense — (13.6 ) — — — (13.6 ) Other nonoperating income — 0.4 (0.2 ) — — 0.2 Total other income (expense) — (12.5 ) (0.2 ) — — (12.7 ) Income (loss) before income taxes — 6.1 (0.2 ) — — 5.9 Income tax expense — 0.6 — — — 0.6 Income (loss) — 5.5 (0.2 ) — — 5.3 Equity earnings in affiliates, net of tax 5.3 (0.2 ) — — (5.1 ) — Net Income (Loss) $ 5.3 $ 5.3 $ (0.2 ) $ — $ (5.1 ) $ 5.3 CONSOLIDATING INCOME STATEMENT (Millions of dollars) Three Months Ended March 31, 2018 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,637.6 $ — $ — $ — $ 2,637.6 Merchandise sales — 567.7 — — — 567.7 Other operating revenues — 38.9 — — — 38.9 Total operating revenues — 3,244.2 — — — 3,244.2 Operating Expenses Petroleum product cost of goods sold — 2,561.1 — — — 2,561.1 Merchandise cost of goods sold — 476.2 — — — 476.2 Station and other operating expenses — 127.4 — — — 127.4 Depreciation and amortization — 31.8 — — — 31.8 Selling, general and administrative — 34.5 — — — 34.5 Accretion of asset retirement obligations — 0.5 — — — 0.5 Total operating expenses — 3,231.5 — — — 3,231.5 Net settlement proceeds — 47.0 — — — 47.0 Gain (loss) on sale of assets — 0.3 — — — 0.3 Income (loss) from operations — 60.0 — — — 60.0 Other income (expense) Interest income — 0.3 — — — 0.3 Interest expense — (13.0 ) — — — (13.0 ) Other nonoperating income — — — — — — Total other income (expense) — (12.7 ) — — — (12.7 ) Income (loss) before income taxes — 47.3 — — — 47.3 Income tax expense — 8.0 — — — 8.0 Income (loss) — 39.3 — — — 39.3 Equity earnings in affiliates, net of tax 39.3 — — — (39.3 ) — Net Income (Loss) $ 39.3 $ 39.3 $ — $ — $ (39.3 ) $ 39.3 CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Three Months Ended March 31, 2019 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 5.3 $ 5.3 $ (0.2 ) $ — $ (5.1 ) $ 5.3 Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities Depreciation and amortization — 39.7 — — — 39.7 Deferred and noncurrent income tax charges (credits) — (2.4 ) — — — (2.4 ) Accretion of asset retirement obligations — 0.5 — — — 0.5 (Gain) loss on sale of assets — 0.1 — — — 0.1 Net (increase) decrease in noncash operating working capital — 1.7 — — — 1.7 Equity in earnings of affiliates (5.3 ) 0.2 — — 5.1 — Other operating activities - net — 3.2 — — — 3.2 Net cash provided by (required by) operating activities — 48.3 (0.2 ) — — 48.1 Investing Activities Property additions — (28.8 ) (1.7 ) — — (30.5 ) Proceeds from sale of assets — 1.1 — — — 1.1 Other investing activities - net — (0.1 ) — — — (0.1 ) Net cash provided by (required by) investing activities — (27.8 ) (1.7 ) — — (29.5 ) Financing Activities Purchase of treasury stock (13.3 ) — — — — (13.3 ) Borrowings of debt — — — — — — Repayments of debt — (5.4 ) — — — (5.4 ) Debt issuance costs — — — — — — Amounts related to share-based compensation — (4.0 ) — — — (4.0 ) Net distributions to parent 13.3 (15.2 ) 1.9 — — — Net cash provided by (required by) financing activities — (24.6 ) 1.9 — — (22.7 ) Net increase (decrease) in cash and cash equivalents — (4.1 ) — — — (4.1 ) Cash, cash equivalents, and restricted cash at January 1 — 184.0 0.5 — — 184.5 Cash, cash equivalents, and restricted cash at March 31 $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 Reconciliation of Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents at beginning of period $ — $ 184.0 $ 0.5 $ — $ — $ 184.5 Restricted cash at beginning of period — — — — — — Cash, cash equivalents, and restricted cash at beginning of period $ — $ 184.0 $ 0.5 $ — $ — $ 184.5 Cash and cash equivalents at end of period $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 Restricted cash at end of period — — — — — — Cash, cash equivalents, and restricted cash at end of period $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Three Months Ended March 31, 2018 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 39.3 $ 39.3 $ — $ — $ (39.3 ) $ 39.3 Adjustments to reconcile net income (loss) to net cash provided by (required by)operating activities Depreciation and amortization — 31.8 — — — 31.8 Deferred and noncurrent income tax charges (credits) — 1.1 — — — 1.1 Accretion of asset retirement obligations — 0.5 — — — 0.5 Pretax (gains) losses from sale of assets — (0.3 ) — — — (0.3 ) Net (increase) decrease in noncash operating working capital — 36.0 — — — 36.0 Equity in earnings of affiliates (39.3 ) — — — 39.3 — Other operating activities - net — (1.0 ) — — — (1.0 ) Net cash provided by (required by) operating activities — 107.4 — — — 107.4 Investing Activities Property additions — (48.3 ) (0.4 ) — — (48.7 ) Proceeds from sale of assets — 1.1 — — — 1.1 Other investing activities - net — (4.7 ) — — — (4.7 ) Net cash provided by (required by) investing activities — (51.9 ) (0.4 ) — — (52.3 ) Financing Activities Purchase of treasury stock (71.7 ) — — — — (71.7 ) Borrowings of debt — — — — — — Repayments of debt — (5.3 ) — — — (5.3 ) Debt issuance costs — — — — — — Amounts related to share-based compensation — (2.9 ) — — — (2.9 ) Net distributions to parent 71.7 (72.3 ) 0.6 — — — Net cash provided by (required) by financing activities — (80.5 ) 0.6 — — (79.9 ) Net increase (decrease) in cash and cash equivalents — (25.0 ) 0.2 — — (24.8 ) Cash, cash equivalents, and restricted cash at January 1 — 169.9 0.1 — — 170.0 Cash, cash equivalents, and restricted cash at March 31 $ — $ 144.9 $ 0.3 $ — $ — $ 145.2 Reconciliation of Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents at beginning of period $ — $ 169.9 $ 0.1 $ — $ — $ 170.0 Restricted cash at beginning of period — — — — — — Cash, cash equivalents, and restricted cash at beginning of period $ — $ 169.9 $ 0.1 $ — $ — $ 170.0 Cash and cash equivalents at end of period $ — $ 143.8 $ 0.3 $ — $ — $ 144.1 Restricted cash at end of period — 1.1 — — — 1.1 Cash, cash equivalents, and restricted cash at end of period $ — $ 144.9 $ 0.3 $ — $ — $ 145.2 CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Three Months Ended March 31, 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 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 ) 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 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 CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Three Months Ended March 31, 2018 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2017 $ 0.5 $ — $ 0.1 $ — $ (0.1 ) $ 0.5 Issuance of common stock — — — — — — Balance as of March 31, 2018 $ 0.5 $ — $ 0.1 $ — $ (0.1 ) $ 0.5 Treasury Stock Balance as of December 31, 2017 $ (806.5 ) $ — $ — $ — $ — $ (806.5 ) Issuance of treasury stock 4.4 — — — — 4.4 Repurchase of treasury stock (71.7 ) — — — — (71.7 ) Balance as of March 31, 2018 $ (873.8 ) $ — $ — $ — $ — $ (873.8 ) APIC Balance as of December 31, 2017 $ 1,205.7 $ 573.1 $ 52.0 $ 87.5 $ (1,368.4 ) $ 549.9 Issuance of treasury stock (4.4 ) — — — — (4.4 ) Amounts related to share-based compensation — (2.9 ) — — — (2.9 ) Share-based compensation expense — 2.2 — — — 2.2 Balance as of March 31, 2018 $ 1,201.3 $ 572.4 $ 52.0 $ 87.5 $ (1,368.4 ) $ 544.8 Retained Earnings Balance as of December 31, 2017 $ 994.5 $ 933.0 $ — $ 66.8 $ (999.8 ) $ 994.5 Net income (loss) 39.3 39.3 — — (39.3 ) 39.3 Balance as of March 31, 2018 $ 1,033.8 $ 972.3 $ — $ 66.8 $ (1,039.1 ) $ 1,033.8

Description of Business and B_2

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
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 February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting by recognizing lease assets and lease liabilities on the balance sheet for those leases classified as operating leases under current GAAP. ASU 2016-02 requires that a lessee should recognize a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term on the balance sheet. We adopted ASU 2016-02 as of January 1, 2019, using the modified retrospective approach. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allowed us to carry forward the historical lease classification. We also elected the practical expedient related to land easements, allowing us to carry forward our accounting treatment for land easements on existing agreements. In addition, we elected the hindsight practical expedient to determine the lease term for existing leases. Our election of the hindsight practical expedient resulted in the shortening of lease terms for certain existing leases and the useful lives of corresponding leasehold improvements. In our application of hindsight, we evaluated the performance of the leased stores and the associated markets in relation to our overall real estate strategies, which resulted in the determination that renewal options would not be reasonably certain in determining the expected lease term. Adoption of the new standard resulted in the recording of additional net lease assets and lease liabilities of approximately $110.4 million and $110.7 million , respectively. The standard did not materially impact our consolidated net earnings and had no impact on cash flows. See Note 13 "Lease Accounting" for further details. 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 is effective for the Company on January 1, 2020. Early adoption is permitted. The amendments in this update should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently assessing the effect that this ASU will have on our financial position, results of operations, and disclosures but does not expect this update to have a material impact on the Company's consolidated financial statements.
Revenue Recognition	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 to seven days, depending on the terms with the particular credit/debit card providers. Payment fees retained by the credit/debit card providers are recorded as station and other operating expenses. 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. The rewards may be redeemed for merchandise or cash discounts on fuel purchases. The program was rolled out chain-wide in March 2019. Due to the limited nature of the pilot program and the short amount of time the program has been in effect at scale, the deferred revenues recorded in the three months ended March 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. 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.
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)	3 Months Ended
	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables disaggregates our revenue by major source for the three months ended March 31, 2019 and 2018 , respectively: Three Months Ended March 31, 2019 Three Months Ended March 31, 2018 (Millions of dollars) Marketing Corporate and Other Assets Consolidated Marketing Corporate and Other Assets Consolidated Petroleum product sales (at retail) 1 $ 2,238.7 $ — $ 2,238.7 $ 2,339.7 $ — $ 2,339.7 Petroleum product sales (at wholesale) 1 261.1 — 261.1 297.9 — 297.9 Total petroleum product sales 2,499.8 — 2,499.8 2,637.6 — 2,637.6 Merchandise sales 606.2 — 606.2 567.7 — 567.7 Other operating revenues: RINs 9.1 — 9.1 37.4 — 37.4 Other revenues 2 1.2 0.1 1.3 1.1 0.4 1.5 Total revenues $ 3,116.3 $ 0.1 $ 3,116.4 $ 3,243.8 $ 0.4 $ 3,244.2 1 Includes excise and sales taxes that remain eligible for inclusion under Topic 606 2 Primarily includes collection allowance on excise and sales taxes and other miscellaneous items

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Summary of Inventory	Inventories consisted of the following: (Millions of dollars) March 31, December 31, Finished products - First-In, First-Out ("FIFO") basis $ 247.2 $ 219.4 Less: Last-In, First-Out ("LIFO") reserve - finished products (181.3 ) (115.5 ) Finished products - LIFO basis 65.9 103.9 Store merchandise for resale 101.3 107.2 Materials and supplies 11.5 10.4 Total inventories $ 178.7 $ 221.5

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt consisted of the following: (Millions of dollars) March 31, December 31, 6.00% senior notes due 2023 (net of unamortized discount of $3.9 at March 31, 2019 and $4.1 at December 2018) $ 496.1 $ 495.9 5.625% senior notes due 2027 (net of unamortized discount of $3.0 at March 31, 2019 and $3.1 at December 2018) 297.0 296.9 Term loan due 2020 (effective interest rate of 5.052% at March 31, 2019) 67.0 72.0 Capitalized lease obligations, vehicles, due through 2022 2.6 2.3 Less unamortized debt issuance costs (3.4 ) (3.8 ) Total long-term debt 859.3 863.3 Less current maturities 21.3 21.2 Total long-term debt, net of current $ 838.0 $ 842.1

Asset Retirement Obligations _2

Asset Retirement Obligations (ARO) (Tables)	3 Months Ended
	Mar. 31, 2019
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) March 31, December 31, Balance at beginning of period $ 30.7 $ 28.2 Accretion expense 0.5 2.0 Settlements of liabilities — (0.3 ) Liabilities incurred — 0.8 Balance at end of period $ 31.2 $ 30.7

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Summary of Effective Income Tax Rates	For the three month periods ended March 31, 2019 and 2018 , the Company’s approximate effective tax rates were as follows: 2019 2018 Three months ended March 31, 10.9% 16.8%

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
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 months ended March 31, 2019 and 2018 : Three Months Ended (Millions of dollars, except share and per share amounts) 2019 2018 Earnings per common share: Net income per share - basic Net income attributable to common stockholders $ 5.3 $ 39.3 Weighted average common shares outstanding (in thousands) 32,206 33,698 Earnings per common share $ 0.16 $ 1.17 Earnings per common share - assuming dilution: Net income per share - diluted Net income attributable to common stockholders $ 5.3 $ 39.3 Weighted average common shares outstanding (in thousands) 32,206 33,698 Common equivalent shares: Dilutive share-based awards 214 364 Weighted average common shares outstanding - assuming dilution (in thousands) 32,420 34,062 Earnings per common share assuming dilution $ 0.16 $ 1.16

Other Financial Information (Ta

Other Financial Information (Tables)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Changes in Operating Working Capital	Three Months Ended (Millions of dollars) 2019 2018 Accounts receivable $ (88.5 ) $ 27.2 Inventories 42.7 33.9 Prepaid expenses and other current assets (1.1 ) 8.9 Accounts payable and accrued liabilities 48.6 (35.2 ) Income taxes payable — 1.2 Net (increase) decrease in noncash operating working capital $ 1.7 $ 36.0

Assets and Liabilities Measur_2

Assets and Liabilities Measured at Fair Value (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 and December 31, 2018 . 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 March 31, 2019 At December 31, 2018 Carrying Carrying (Millions of dollars) Amount Fair Value Amount Fair Value Financial liabilities Current and long-term debt $ (859.3 ) $ (874.5 ) $ (863.3 ) $ (866.7 )

Lease Accounting (Tables)

Lease Accounting (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Lessee, Lease	Leases are reflected in the following balance sheet accounts: (Millions of dollars) Classification March 31, Assets Operating (Right-of-use) Other Assets $ 110.4 Finance Property, plant, and equipment, at cost, less accumulated depreciation of $1.9 million 3.2 Total leased assets $ 113.6 Liabilities Current Operating Trade accounts payable and accrued liabilities $ 6.3 Finance Current maturities of long-term debt 1.3 Noncurrent Operating Deferred credits and other liabilities 104.4 Finance Long-term debt, including capitalized lease obligations 1.4 Total lease liabilities $ 113.4
Lease, Cost	Lease Cost: Three Months Ended (Millions of dollars) Classification 2019 Operating lease cost Station and other operating expenses $ 3.5 Finance lease cost Amortization of leased assets Depreciation & amortization expense 0.3 Interest on lease liabilities Interest expense — Net lease costs $ 3.8 Cash flow information: Three Months Ended (Millions of dollars) 2019 Cash paid for amounts included in the measurement of liabilities Operating cash flows from operating leases $ 3.3 Operating cash flows from finance leases $ — Financing cash flows from finance leases $ 0.4
Finance Lease, Liability, Maturity	Maturity of Lease Liabilities: (Millions of dollars) Operating leases Finance leases 2019 $ 10.3 $ 1.1 2020 13.5 1.1 2021 12.7 0.6 2022 11.8 0.1 2023 11.2 — After 2023 130.1 — Total lease payments 189.6 2.9 less: interest 78.9 0.2 Present value of lease liabilities $ 110.7 $ 2.7
Schedule of Future Minimum Lease Payments for Capital Leases	Future annual minimum lease payments and capital lease commitments as of December 31, 2018 were as follows: (Millions of dollars) Operating leases Capital leases 2019 $ 13.7 $ 1.5 2020 13.3 1.1 2021 12.5 0.6 2022 11.7 0.1 2023 11.1 — After 2023 122.6 — Total lease payments 184.9 3.3 less: interest — 0.2 Present value of minimum payments $ 184.9 $ 3.1
Schedule of Future Minimum Rental Payments for Operating Leases	Future annual minimum lease payments and capital lease commitments as of December 31, 2018 were as follows: (Millions of dollars) Operating leases Capital leases 2019 $ 13.7 $ 1.5 2020 13.3 1.1 2021 12.5 0.6 2022 11.7 0.1 2023 11.1 — After 2023 122.6 — Total lease payments 184.9 3.3 less: interest — 0.2 Present value of minimum payments $ 184.9 $ 3.1
Lessee, Lease Terms	Three Months Ended 2019 Weighted average remaining lease term (years) Finance leases 2.2 Operating leases 15.4 Weighted average discount rate Finance leases 4.8 % Operating leases 6.1 %
Lessee, Operating Lease, Liability, Maturity	Maturity of Lease Liabilities: (Millions of dollars) Operating leases Finance leases 2019 $ 10.3 $ 1.1 2020 13.5 1.1 2021 12.7 0.6 2022 11.8 0.1 2023 11.2 — After 2023 130.1 — Total lease payments 189.6 2.9 less: interest 78.9 0.2 Present value of lease liabilities $ 110.7 $ 2.7

Business Segment (Tables)

Business Segment (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Summary of Information by Business Segment	Three Months Ended March 31, 2019 March 31, 2018 Total Assets at External Income External Income (Millions of dollars) March 31, 2019 Revenues (Loss) Revenues (Loss) Marketing $ 2,155.4 $ 3,116.3 $ 16.2 $ 3,243.8 $ 10.7 Corporate and other assets 349.0 0.1 (10.9 ) 0.4 28.6 Total $ 2,504.4 $ 3,116.4 $ 5.3 $ 3,244.2 $ 39.3

Guarantor Subsidiaries (Tables)

Guarantor Subsidiaries (Tables)	3 Months Ended
	Mar. 31, 2019
Guarantor Subsidiaries [Abstract]
Consolidating Balance Sheet	CONSOLIDATING BALANCE SHEET (Millions of dollars, except share amounts) March 31, 2019 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 Accounts receivable—trade, less allowance for doubtful accounts of $1.1 in 2019 — 227.3 — — — 227.3 Inventories, at lower of cost or market — 178.7 — — — 178.7 Prepaid expenses and other current assets — 26.3 0.2 — — 26.5 Total current assets — 612.2 0.7 — — 612.9 Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,013.3 in 2019 — 1,734.1 4.0 — — 1,738.1 Investments in subsidiaries 2,442.3 144.2 — — (2,586.5 ) — Other assets — 153.4 — — — 153.4 Total assets $ 2,442.3 $ 2,643.9 $ 4.7 $ — $ (2,586.5 ) $ 2,504.4 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 21.3 $ — $ — $ — $ 21.3 Inter-company accounts payable 13.2 187.8 (46.7 ) (154.3 ) — — Trade accounts payable and accrued liabilities — 512.0 — — — 512.0 Total current liabilities 13.2 721.1 (46.7 ) (154.3 ) — 533.3 Long-term debt, including capitalized lease obligations — 838.0 — — — 838.0 Deferred income taxes — 189.8 — — — 189.8 Asset retirement obligations — 31.2 — — — 31.2 Deferred credits and other liabilities — 114.3 — — — 114.3 Total liabilities 13.2 1,894.4 (46.7 ) (154.3 ) — 1,706.6 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 March 31, 2019) 0.5 — 0.1 — (0.1 ) 0.5 Treasury Stock (14,596,759 shares held at March 31, 2019) (948.0 ) — — — — (948.0 ) Additional paid in capital (APIC) 1,189.5 571.3 52.0 87.5 (1,368.4 ) 531.9 Retained earnings 2,187.1 178.2 (0.7 ) 66.8 (1,218.0 ) 1,213.4 Total stockholders' equity 2,429.1 749.5 51.4 154.3 (2,586.5 ) 797.8 Total liabilities and stockholders' equity $ 2,442.3 $ 2,643.9 $ 4.7 $ — $ (2,586.5 ) $ 2,504.4 CONSOLIDATING BALANCE SHEET (Millions of dollars, except share amounts) December 31, 2018 Assets Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Current assets Cash and cash equivalents $ — $ 184.0 $ 0.5 $ — $ — $ 184.5 Accounts receivable—trade, less allowance for doubtful accounts of $1.1 in 2018 — 138.8 — — — 138.8 Inventories, at lower of cost or market — 221.5 — — — 221.5 Prepaid expenses and other current assets — 25.1 0.2 — — 25.3 Total current assets — 569.4 0.7 — — 570.1 Property, plant and equipment, at cost less accumulated depreciation and amortization of $974.2 in 2018 — 1,745.9 2.3 — — 1,748.2 Investments in subsidiaries 2,437.0 144.4 — — (2,581.4 ) — Other assets — 42.5 — — — 42.5 Total assets $ 2,437.0 $ 2,502.2 $ 3.0 $ — $ (2,581.4 ) $ 2,360.8 Liabilities and Stockholders' Equity Current liabilities Current maturities of long-term debt $ — $ 21.2 $ — $ — $ — $ 21.2 Inter-company accounts payable (0.1 ) 203.0 (48.6 ) (154.3 ) — — Trade accounts payable and accrued liabilities — 456.9 — — — 456.9 Total current liabilities (0.1 ) 681.1 (48.6 ) (154.3 ) — 478.1 Long-term debt, including capitalized lease obligations — 842.1 — — — 842.1 Deferred income taxes — 192.2 — — — 192.2 Asset retirement obligations — 30.7 — — — 30.7 Deferred credits and other liabilities — 10.4 — — — 10.4 Total liabilities (0.1 ) 1,756.5 (48.6 ) (154.3 ) — 1,553.5 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 December 31, 2018) 0.5 — 0.1 — (0.1 ) 0.5 Treasury Stock (14,505,681 shares held at December 31, 2018) (940.3 ) — — — — (940.3 ) Additional paid in capital (APIC) 1,195.1 572.8 52.0 87.5 (1,368.4 ) 539.0 Retained earnings 2,181.8 172.9 (0.5 ) 66.8 (1,212.9 ) 1,208.1 Total stockholders' equity 2,437.1 745.7 51.6 154.3 (2,581.4 ) 807.3 Total liabilities and stockholders' equity $ 2,437.0 $ 2,502.2 $ 3.0 $ — $ (2,581.4 ) $ 2,360.8
Consolidating Income Statement	CONSOLIDATING INCOME STATEMENT (Millions of dollars) Three Months Ended March 31, 2019 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,499.8 $ — $ — $ — $ 2,499.8 Merchandise sales — 606.2 — — — 606.2 Other operating revenues — 10.4 — — — 10.4 Total operating revenues — 3,116.4 — — — 3,116.4 Operating Expenses Petroleum product cost of goods sold — 2,381.5 — — — 2,381.5 Merchandise cost of goods sold — 508.7 — — — 508.7 Station and other operating expenses — 132.8 — — — 132.8 Depreciation and amortization — 39.7 — — — 39.7 Selling, general and administrative — 34.6 — — — 34.6 Accretion of asset retirement obligations — 0.5 — — — 0.5 Total operating expenses — 3,097.8 — — — 3,097.8 Net settlement proceeds — 0.1 — — — 0.1 Gain (loss) on sale of assets — (0.1 ) — — — (0.1 ) Income (loss) from operations — 18.6 — — — 18.6 Other income (expense) Interest income — 0.7 — — — 0.7 Interest expense — (13.6 ) — — — (13.6 ) Other nonoperating income — 0.4 (0.2 ) — — 0.2 Total other income (expense) — (12.5 ) (0.2 ) — — (12.7 ) Income (loss) before income taxes — 6.1 (0.2 ) — — 5.9 Income tax expense — 0.6 — — — 0.6 Income (loss) — 5.5 (0.2 ) — — 5.3 Equity earnings in affiliates, net of tax 5.3 (0.2 ) — — (5.1 ) — Net Income (Loss) $ 5.3 $ 5.3 $ (0.2 ) $ — $ (5.1 ) $ 5.3 CONSOLIDATING INCOME STATEMENT (Millions of dollars) Three Months Ended March 31, 2018 Operating Revenues Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Petroleum product sales $ — $ 2,637.6 $ — $ — $ — $ 2,637.6 Merchandise sales — 567.7 — — — 567.7 Other operating revenues — 38.9 — — — 38.9 Total operating revenues — 3,244.2 — — — 3,244.2 Operating Expenses Petroleum product cost of goods sold — 2,561.1 — — — 2,561.1 Merchandise cost of goods sold — 476.2 — — — 476.2 Station and other operating expenses — 127.4 — — — 127.4 Depreciation and amortization — 31.8 — — — 31.8 Selling, general and administrative — 34.5 — — — 34.5 Accretion of asset retirement obligations — 0.5 — — — 0.5 Total operating expenses — 3,231.5 — — — 3,231.5 Net settlement proceeds — 47.0 — — — 47.0 Gain (loss) on sale of assets — 0.3 — — — 0.3 Income (loss) from operations — 60.0 — — — 60.0 Other income (expense) Interest income — 0.3 — — — 0.3 Interest expense — (13.0 ) — — — (13.0 ) Other nonoperating income — — — — — — Total other income (expense) — (12.7 ) — — — (12.7 ) Income (loss) before income taxes — 47.3 — — — 47.3 Income tax expense — 8.0 — — — 8.0 Income (loss) — 39.3 — — — 39.3 Equity earnings in affiliates, net of tax 39.3 — — — (39.3 ) — Net Income (Loss) $ 39.3 $ 39.3 $ — $ — $ (39.3 ) $ 39.3
Consolidating Statement of Cash Flow	CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Three Months Ended March 31, 2019 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 5.3 $ 5.3 $ (0.2 ) $ — $ (5.1 ) $ 5.3 Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities Depreciation and amortization — 39.7 — — — 39.7 Deferred and noncurrent income tax charges (credits) — (2.4 ) — — — (2.4 ) Accretion of asset retirement obligations — 0.5 — — — 0.5 (Gain) loss on sale of assets — 0.1 — — — 0.1 Net (increase) decrease in noncash operating working capital — 1.7 — — — 1.7 Equity in earnings of affiliates (5.3 ) 0.2 — — 5.1 — Other operating activities - net — 3.2 — — — 3.2 Net cash provided by (required by) operating activities — 48.3 (0.2 ) — — 48.1 Investing Activities Property additions — (28.8 ) (1.7 ) — — (30.5 ) Proceeds from sale of assets — 1.1 — — — 1.1 Other investing activities - net — (0.1 ) — — — (0.1 ) Net cash provided by (required by) investing activities — (27.8 ) (1.7 ) — — (29.5 ) Financing Activities Purchase of treasury stock (13.3 ) — — — — (13.3 ) Borrowings of debt — — — — — — Repayments of debt — (5.4 ) — — — (5.4 ) Debt issuance costs — — — — — — Amounts related to share-based compensation — (4.0 ) — — — (4.0 ) Net distributions to parent 13.3 (15.2 ) 1.9 — — — Net cash provided by (required by) financing activities — (24.6 ) 1.9 — — (22.7 ) Net increase (decrease) in cash and cash equivalents — (4.1 ) — — — (4.1 ) Cash, cash equivalents, and restricted cash at January 1 — 184.0 0.5 — — 184.5 Cash, cash equivalents, and restricted cash at March 31 $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 Reconciliation of Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents at beginning of period $ — $ 184.0 $ 0.5 $ — $ — $ 184.5 Restricted cash at beginning of period — — — — — — Cash, cash equivalents, and restricted cash at beginning of period $ — $ 184.0 $ 0.5 $ — $ — $ 184.5 Cash and cash equivalents at end of period $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 Restricted cash at end of period — — — — — — Cash, cash equivalents, and restricted cash at end of period $ — $ 179.9 $ 0.5 $ — $ — $ 180.4 CONSOLIDATING STATEMENT OF CASH FLOW (Millions of dollars) Three Months Ended March 31, 2018 Operating Activities Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Net income (loss) $ 39.3 $ 39.3 $ — $ — $ (39.3 ) $ 39.3 Adjustments to reconcile net income (loss) to net cash provided by (required by)operating activities Depreciation and amortization — 31.8 — — — 31.8 Deferred and noncurrent income tax charges (credits) — 1.1 — — — 1.1 Accretion of asset retirement obligations — 0.5 — — — 0.5 Pretax (gains) losses from sale of assets — (0.3 ) — — — (0.3 ) Net (increase) decrease in noncash operating working capital — 36.0 — — — 36.0 Equity in earnings of affiliates (39.3 ) — — — 39.3 — Other operating activities - net — (1.0 ) — — — (1.0 ) Net cash provided by (required by) operating activities — 107.4 — — — 107.4 Investing Activities Property additions — (48.3 ) (0.4 ) — — (48.7 ) Proceeds from sale of assets — 1.1 — — — 1.1 Other investing activities - net — (4.7 ) — — — (4.7 ) Net cash provided by (required by) investing activities — (51.9 ) (0.4 ) — — (52.3 ) Financing Activities Purchase of treasury stock (71.7 ) — — — — (71.7 ) Borrowings of debt — — — — — — Repayments of debt — (5.3 ) — — — (5.3 ) Debt issuance costs — — — — — — Amounts related to share-based compensation — (2.9 ) — — — (2.9 ) Net distributions to parent 71.7 (72.3 ) 0.6 — — — Net cash provided by (required) by financing activities — (80.5 ) 0.6 — — (79.9 ) Net increase (decrease) in cash and cash equivalents — (25.0 ) 0.2 — — (24.8 ) Cash, cash equivalents, and restricted cash at January 1 — 169.9 0.1 — — 170.0 Cash, cash equivalents, and restricted cash at March 31 $ — $ 144.9 $ 0.3 $ — $ — $ 145.2 Reconciliation of Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents at beginning of period $ — $ 169.9 $ 0.1 $ — $ — $ 170.0 Restricted cash at beginning of period — — — — — — Cash, cash equivalents, and restricted cash at beginning of period $ — $ 169.9 $ 0.1 $ — $ — $ 170.0 Cash and cash equivalents at end of period $ — $ 143.8 $ 0.3 $ — $ — $ 144.1 Restricted cash at end of period — 1.1 — — — 1.1 Cash, cash equivalents, and restricted cash at end of period $ — $ 144.9 $ 0.3 $ — $ — $ 145.2
Consolidating Statement of Changes in Equity	CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Three Months Ended March 31, 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 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 ) 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 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 CONSOLIDATING STATEMENT OF CHANGES IN EQUITY (Millions of dollars) Three Months Ended March 31, 2018 Statement of Stockholders' Equity Parent Company Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated Common Stock Balance as of December 31, 2017 $ 0.5 $ — $ 0.1 $ — $ (0.1 ) $ 0.5 Issuance of common stock — — — — — — Balance as of March 31, 2018 $ 0.5 $ — $ 0.1 $ — $ (0.1 ) $ 0.5 Treasury Stock Balance as of December 31, 2017 $ (806.5 ) $ — $ — $ — $ — $ (806.5 ) Issuance of treasury stock 4.4 — — — — 4.4 Repurchase of treasury stock (71.7 ) — — — — (71.7 ) Balance as of March 31, 2018 $ (873.8 ) $ — $ — $ — $ — $ (873.8 ) APIC Balance as of December 31, 2017 $ 1,205.7 $ 573.1 $ 52.0 $ 87.5 $ (1,368.4 ) $ 549.9 Issuance of treasury stock (4.4 ) — — — — (4.4 ) Amounts related to share-based compensation — (2.9 ) — — — (2.9 ) Share-based compensation expense — 2.2 — — — 2.2 Balance as of March 31, 2018 $ 1,201.3 $ 572.4 $ 52.0 $ 87.5 $ (1,368.4 ) $ 544.8 Retained Earnings Balance as of December 31, 2017 $ 994.5 $ 933.0 $ — $ 66.8 $ (999.8 ) $ 994.5 Net income (loss) 39.3 39.3 — — (39.3 ) 39.3 Balance as of March 31, 2018 $ 1,033.8 $ 972.3 $ — $ 66.8 $ (1,039.1 ) $ 1,033.8

Description of Business and B_3

Description of Business and Basis of Presentation (Details)	Aug. 30, 2013	Mar. 31, 2013USD ($)$ / sharesshares	Mar. 31, 2019USD ($)statestation$ / shares	Jan. 01, 2019USD ($)	Dec. 31, 2018$ / shares
Product Information [Line Items]
Number of states in which entity operates | state			26
Number of stations | station			1,473
Common stock shares issued (in shares) | shares		100
Common stock par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01		$ 0.01
Proceeds from issuance of common stock		$ 1
Percentage of shares of stock distributed	100.00%
Lease asset			$ 110,400,000
Lease liability			$ 110,700,000
Murphy USA
Product Information [Line Items]
Number of stations | station			1,160
Murphy Express
Product Information [Line Items]
Number of stations | station			313
Accounting Standards Update 2016-02
Product Information [Line Items]
Lease asset				$ 110,400,000
Lease liability				$ 110,700,000

Revenues (Disaggregation of Rev

Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,116.4	$ 3,244.2
Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Total revenues	2,238.7	2,339.7
Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Total revenues	261.1	297.9
Total petroleum product sales
Disaggregation of Revenue [Line Items]
Total revenues	2,499.8	2,637.6
Merchandise sales
Disaggregation of Revenue [Line Items]
Total revenues	606.2	567.7
RINs
Disaggregation of Revenue [Line Items]
Total revenues	9.1	37.4
Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	1.3	1.5
Operating Segments | Marketing
Disaggregation of Revenue [Line Items]
Total revenues	3,116.3	3,243.8
Operating Segments | Marketing | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Total revenues	2,238.7	2,339.7
Operating Segments | Marketing | Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Total revenues	261.1	297.9
Operating Segments | Marketing | Total petroleum product sales
Disaggregation of Revenue [Line Items]
Total revenues	2,499.8	2,637.6
Operating Segments | Marketing | Merchandise sales
Disaggregation of Revenue [Line Items]
Total revenues	606.2	567.7
Operating Segments | Marketing | RINs
Disaggregation of Revenue [Line Items]
Total revenues	9.1	37.4
Operating Segments | Marketing | Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	1.2	1.1
Corporate and other assets
Disaggregation of Revenue [Line Items]
Total revenues	0.1	0.4
Corporate and other assets | Petroleum product sales (at retail)
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Corporate and other assets | Petroleum product sales (at wholesale)
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Corporate and other assets | Total petroleum product sales
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Corporate and other assets | Merchandise sales
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Corporate and other assets | RINs
Disaggregation of Revenue [Line Items]
Total revenues	0	0
Corporate and other assets | Other revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 0.1	$ 0.4

Revenues (Narrative) (Details)

Revenues (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Trade accounts receivable	$ 227.3	$ 138.8
Receivables related to contracts with customers
Disaggregation of Revenue [Line Items]
Trade accounts receivable	$ 169.9	$ 79.4
Bulk pipelines sales
Disaggregation of Revenue [Line Items]
Collection period	7 days
Petroleum product sales, rack sales
Disaggregation of Revenue [Line Items]
Collection period	10 days
RINs
Disaggregation of Revenue [Line Items]
Collection period	5 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	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished products - First-In, First-Out (FIFO) basis	$ 247.2	$ 219.4
Less: Last-In, First-Out (LIFO) reserve - finished products	(181.3)	(115.5)
Finished products - LIFO basis	65.9	103.9
Store merchandise for resale	101.3	107.2
Materials and supplies	11.5	10.4
Total inventories	$ 178.7	$ 221.5

Inventories - Narrative (Detail

Inventories - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventory, LIFO reserve	$ 181.3	$ 115.5

Long-Term Debt (Summary Of Long

Long-Term Debt (Summary Of Long-Term Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Apr. 25, 2017	Aug. 14, 2013
Debt Instrument [Line Items]
Capitalized lease obligations, vehicles, due through 2022	$ 2.6	$ 2.3
Less unamortized debt issuance costs	(3.4)	(3.8)
Total long-term debt	859.3	863.3
Less current maturities	21.3	21.2
Total long-term debt, net of current	838	842.1
Senior Notes | 6.00% senior notes due 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 496.1	495.9
Stated interest rate	6.00%			6.00%
Unamortized discount	$ 3.9	4.1
Senior Notes | 5.625% senior notes due 2027
Debt Instrument [Line Items]
Long-term debt, gross	$ 297	296.9
Stated interest rate	5.625%		5.625%
Unamortized discount	$ 3	3.1
Secured Debt | Term loan due 2020 | Term facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 67	$ 72
Effective interest rate	5.052%

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details)	Mar. 10, 2016USD ($)	Mar. 31, 2019USD ($)	Apr. 25, 2017USD ($)	Mar. 31, 2016USD ($)	Aug. 14, 2013USD ($)
Debt Instrument [Line Items]
Fixed charge coverage ratio		1.25
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		0.16
Dividend restrictions		The Senior 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, 2018, our ability to make restricted payments was not limited as our availability under the borrowing base was more than $100 million, while our fixed charge coverage ratio under our Senior Credit Agreement was less than 1.0 to 1.0. As of December 31, 2017, we had a shortfall of approximately $206.9 million of our net income and retained earnings subject to such restrictions before the fixed charge coverage ratio under our Senior Credit Agreement would exceed 1.0 to 1.0.
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 amount of availability with consideration of fixed charge coverage ratio		$ 100,000,000
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				$ 450,000,000
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				200,000,000
Proceeds borrowed from credit facility	$ 200,000,000
Term of facility	4 years
Asset-based loan facility, portion included in current maturities		$ 67,000,000
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		$ 200,000,000
6% Senior Notes Due 2023 | Senior Notes
Debt Instrument [Line Items]
Interest rate		6.00%			6.00%
Senior notes, principal amount					$ 500,000,000
5.625% Senior Notes Due 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate		5.625%	5.625%
Senior notes, principal amount			$ 300,000,000
Asset Based Loan Facility | ABL facility | ABL 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		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Asset Retirement Obligation Roll Forward
Balance at beginning of period	$ 30.7	$ 28.2	$ 28.2
Accretion expense	0.5	$ 0.5	2
Settlements of liabilities	0		(0.3)
Liabilities incurred	0		0.8
Balance at end of period	$ 31.2		$ 30.7

Income Taxes (Summary of Effect

Income Taxes (Summary of Effective Income Tax Rates) (Details)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective tax rate	10.90%	16.80%

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Tax benefit, settlement of uncertain tax positions		$ 3.1
Total excess tax benefits	$ 0.8	$ 0.7

Incentive Plans (Details)

Incentive Plans (Details)	Mar. 26, 2019$ / sharesshares	Feb. 06, 2019$ / sharescompanyshares	Aug. 30, 2013USD ($)shares	Mar. 31, 2019USD ($)$ / sharesshares	Mar. 31, 2018USD ($)	Aug. 08, 2013shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation | $				$ 2,600,000	$ 2,200,000
Total income tax benefits realized from tax deductions related to stock option exercises under share-based payment arrangements | $				$ 0	$ 100,000
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)			5,500,000
Number of shares per employee (no more than) (in shares)			1,000,000
2013 Long-Term Incentive Plan | Performance Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum amount payable | $			$ 5,000,000
Restricted stock units issued (in shares)		53,100
2013 Long-Term Incentive Plan | Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		99,400
Shares granted, exercise price (in dollars per share) | $ / shares		$ 76.15
Shares granted, fair value (in dollars per share) | $ / shares		20.48
2013 Long-Term Incentive Plan | Return On Average Capital Employed 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) | $ / shares		$ 76.15
Award vesting period (in years)		3 years
2013 Long-Term Incentive Plan | Total Shareholder Return 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) | $ / shares		$ 100.65
Award vesting period (in years)		3 years
Number of companies in total shareholder return peer comparison group | company		16
2013 Long-Term Incentive Plan, RSU Grant One | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)		26,550
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares		$ 76.15
2013 Long-Term Incentive Plan, RSU Grant Two | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)	46,725
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares	$ 82.84
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)						500,000
2013 Stock Plan For Non-Employee Directors | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)				13,086
Restricted stock units issued, weighted average grant date fair value (in dollars per share) | $ / shares				$ 76.63
Award vesting period (in years)				3 years

Financial Instruments and Ris_2

Financial Instruments and Risk Management (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Prepaid expenses and other current assets
Derivative [Line Items]
Cash deposits related to commodity derivative contracts	$ 1.5	$ 1

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - January 2016 Share Repurchase Program - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, shares acquired (in shares)	177,074	928,934
Stock repurchase program, average price per share (in dollars per share)	$ 74.86	$ 77.18

Earnings Per Share (Reconciliat

Earnings Per Share (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income per share - basic
Net income attributable to common stockholders	$ 5.3	$ 39.3
Weighted average common shares outstanding (in shares)	32,206	33,698
Earnings per common share (in dollars per share)	$ 0.16	$ 1.17
Net income per share - diluted
Net income attributable to common stockholders	$ 5.3	$ 39.3
Weighted average common shares outstanding (in shares)	32,206	33,698
Common equivalent shares:
Dilutive share-based awards (in shares)	214	364
Weighted average common shares outstanding - assuming dilution (in shares)	32,420	34,062
Earnings per common share assuming dilution (in dollars per share)	$ 0.16	$ 1.16

Other Financial Information (Na

Other Financial Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash income taxes paid (collected), net of refunds	$ 0.7	$ 2.6
Interest paid, net of amounts capitalized	$ 16.2	$ 15.7

Other Financial Information (Su

Other Financial Information (Summary of Changes in Operating Working Capital) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ (88.5)	$ 27.2
Inventories	42.7	33.9
Prepaid expenses and other current assets	(1.1)	8.9
Accounts payable and accrued liabilities	48.6	(35.2)
Income taxes payable	0	1.2
Net (increase) decrease in noncash operating working capital	$ 1.7	$ 36

Assets and Liabilities Measur_3

Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current and long-term debt	$ (859.3)	$ (863.3)
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current and long-term debt	$ (874.5)	$ (866.7)

Contingencies (Details)

Contingencies (Details)	3 Months Ended
	Mar. 31, 2019USD ($)site
Loss Contingencies [Line Items]
Number of Superfund sites for which company may be liable | site	1
Outstanding letters of credit	$ 16,100,000
Estimate of possible loss	0
Workers Compensation Insurance Claims
Loss Contingencies [Line Items]
Insurance deductible amount	1,000,000
General Liability Insurance Claims
Loss Contingencies [Line Items]
Insurance deductible amount	3,000,000
Auto Liability Insurance Claims
Loss Contingencies [Line Items]
Insurance deductible amount	300,000
Insurance Claims
Loss Contingencies [Line Items]
Loss contingency accrual	$ 19,900,000

Lease Accounting (Narrative) (D

Lease Accounting (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019sitecontract
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	209
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) $ in Millions	Mar. 31, 2019USD ($)
Assets
Operating	$ 110.4
Finance	3.2
Total leased assets	113.6
Current
Operating	6.3
Finance	1.3
Noncurrent
Operating	104.4
Finance	1.4
Total lease liabilities	113.4
Accumulated depreciation	$ 1.9

Lease Accounting (Lease Cost) (

Lease Accounting (Lease Cost) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Leases [Abstract]
Operating lease cost	$ 3.5
Finance lease cost
Amortization of leased assets	0.3
Interest on lease liabilities	0
Net lease costs	$ 3.8

Lease Accounting (Maturity of L

Lease Accounting (Maturity of Lease Liability) (Details) $ in Millions	Mar. 31, 2019USD ($)
Operating leases
2019	$ 10.3
2020	13.5
2021	12.7
2022	11.8
2023	11.2
After 2023	130.1
Total lease payments	189.6
less: interest	78.9
Present value of lease liabilities	110.7
Finance leases
2019	1.1
2020	1.1
2021	0.6
2022	0.1
2023	0
After 2023	0
Total lease payments	2.9
less: interest	0.2
Present value of lease liabilities	$ 2.7

Lease Accounting (Cash Flow Inf

Lease Accounting (Cash Flow Information) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Cash paid for amounts included in the measurement of liabilities
Operating cash flows from operating leases	$ 3.3
Operating cash flows from finance leases	0
Financing cash flows from finance leases	$ 0.4

Lease Accounting (Leases Under

Lease Accounting (Leases Under Topic 840) (Details) $ in Millions	Dec. 31, 2018USD ($)
Operating leases
2019	$ 13.7
2020	13.3
2021	12.5
2022	11.7
2023	11.1
After 2023	122.6
Total lease payments	184.9
Capital leases
2019	1.5
2020	1.1
2021	0.6
2022	0.1
2023	0
After 2023	0
Total lease payments	3.3
less: interest	0.2
Present value of minimum payments	$ 3.1

Lease Accounting (Lease Term an

Lease Accounting (Lease Term and Discount Rate) (Details)	Mar. 31, 2019
Weighted average remaining lease term (years)
Finance leases	2 years 2 months 26 days
Operating leases	15 years 4 months 13 days
Weighted average discount rate
Finance leases	4.80%
Operating leases	6.10%

Business Segment (Narrative) (D

Business Segment (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019segment
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
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total Assets	$ 2,504.4		$ 2,360.8
Total revenues	3,116.4	$ 3,244.2
Income (Loss)	5.3	39.3
Operating Segments | Marketing
Segment Reporting Information [Line Items]
Total Assets	2,155.4
Total revenues	3,116.3	3,243.8
Income (Loss)	16.2	10.7
Corporate and other assets
Segment Reporting Information [Line Items]
Total Assets	349
Total revenues	0.1	0.4
Income (Loss)	$ (10.9)	$ 28.6

Guarantor Subsidiaries (Additio

Guarantor Subsidiaries (Additional Information) (Details) - Senior Notes	Mar. 31, 2019	Apr. 25, 2017	Aug. 14, 2013
6% Senior Notes Due 2023
Debt Instrument [Line Items]
Interest rate	6.00%		6.00%
5.625% Senior Notes Due 2027
Debt Instrument [Line Items]
Interest rate	5.625%	5.625%

Guarantor Subsidiaries (Consoli

Guarantor Subsidiaries (Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 180.4	$ 184.5	$ 144.1	$ 170
Accounts receivable—trade, less allowance for doubtful accounts	227.3	138.8
Inventories, at lower of cost or market	178.7	221.5
Prepaid expenses and other current assets	26.5	25.3
Total current assets	612.9	570.1
Property, plant and equipment, at cost less accumulated depreciation and amortization	1,738.1	1,748.2
Investments in subsidiaries	0	0
Other assets	153.4	42.5
Total assets	2,504.4	2,360.8
Current liabilities
Current maturities of long-term debt	21.3	21.2
Inter-company accounts payable	0	0
Trade accounts payable and accrued liabilities	512	456.9
Total current liabilities	533.3	478.1
Long-term debt, including capitalized lease obligations	838	842.1
Deferred income taxes	189.8	192.2
Asset retirement obligations	31.2	30.7
Deferred credits and other liabilities	114.3	10.4
Total liabilities	1,706.6	1,553.5
Stockholders' Equity
Preferred Stock	0	0
Common Stock	0.5	0.5
Treasury Stock	(948)	(940.3)
Additional paid in capital (APIC)	531.9	539
Retained earnings	1,213.4	1,208.1
Total stockholders' equity	797.8	807.3	705.3	738.4
Total liabilities and stockholders' equity	2,504.4	2,360.8
Eliminations
Current assets
Cash and cash equivalents	0	0	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	(2,586.5)	(2,581.4)
Other assets	0	0
Total assets	(2,586.5)	(2,581.4)
Current liabilities
Current maturities of long-term debt	0	0
Inter-company accounts payable	0	0
Trade accounts payable and accrued liabilities	0	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	(1,218)	(1,212.9)
Total stockholders' equity	(2,586.5)	(2,581.4)
Total liabilities and stockholders' equity	(2,586.5)	(2,581.4)
Parent Company | Reportable Legal Entities
Current assets
Cash and cash equivalents	0	0	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	2,442.3	2,437
Other assets	0	0
Total assets	2,442.3	2,437
Current liabilities
Current maturities of long-term debt	0	0
Inter-company accounts payable	13.2	(0.1)
Trade accounts payable and accrued liabilities	0	0
Total current liabilities	13.2	(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	13.2	(0.1)
Stockholders' Equity
Preferred Stock	0	0
Common Stock	0.5	0.5
Treasury Stock	(948)	(940.3)
Additional paid in capital (APIC)	1,189.5	1,195.1
Retained earnings	2,187.1	2,181.8
Total stockholders' equity	2,429.1	2,437.1
Total liabilities and stockholders' equity	2,442.3	2,437
Issuer | Reportable Legal Entities
Current assets
Cash and cash equivalents	179.9	184	143.8	169.9
Accounts receivable—trade, less allowance for doubtful accounts	227.3	138.8
Inventories, at lower of cost or market	178.7	221.5
Prepaid expenses and other current assets	26.3	25.1
Total current assets	612.2	569.4
Property, plant and equipment, at cost less accumulated depreciation and amortization	1,734.1	1,745.9
Investments in subsidiaries	144.2	144.4
Other assets	153.4	42.5
Total assets	2,643.9	2,502.2
Current liabilities
Current maturities of long-term debt	21.3	21.2
Inter-company accounts payable	187.8	203
Trade accounts payable and accrued liabilities	512	456.9
Total current liabilities	721.1	681.1
Long-term debt, including capitalized lease obligations	838	842.1
Deferred income taxes	189.8	192.2
Asset retirement obligations	31.2	30.7
Deferred credits and other liabilities	114.3	10.4
Total liabilities	1,894.4	1,756.5
Stockholders' Equity
Preferred Stock	0	0
Common Stock	0	0
Treasury Stock	0	0
Additional paid in capital (APIC)	571.3	572.8
Retained earnings	178.2	172.9
Total stockholders' equity	749.5	745.7
Total liabilities and stockholders' equity	2,643.9	2,502.2
Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	0.5	0.5	0.3	0.1
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	0.2	0.2
Total current assets	0.7	0.7
Property, plant and equipment, at cost less accumulated depreciation and amortization	4	2.3
Investments in subsidiaries	0	0
Other assets	0	0
Total assets	4.7	3
Current liabilities
Current maturities of long-term debt	0	0
Inter-company accounts payable	(46.7)	(48.6)
Trade accounts payable and accrued liabilities	0	0
Total current liabilities	(46.7)	(48.6)
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	(46.7)	(48.6)
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	(0.7)	(0.5)
Total stockholders' equity	51.4	51.6
Total liabilities and stockholders' equity	4.7	3
Non-Guarantor Subsidiaries | Reportable Legal Entities
Current assets
Cash and cash equivalents	0	0	$ 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
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
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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2013
Guarantor Subsidiaries [Abstract]
Allowance for doubtful accounts	$ 1.1	$ 1.1
Property, plant and equipment, accumulated depreciation and amortization	$ 1,013.3	$ 974.2
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)	14,596,759	14,505,681

Guarantor Subsidiaries (Conso_3

Guarantor Subsidiaries (Consolidating Income Statement) (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Operating Revenues
Total operating revenues		$ 3,116.4	$ 3,244.2
Operating Expenses
Depreciation and amortization		39.7	31.8
Selling, general and administrative		34.6	34.5
Accretion of asset retirement obligations		0.5	0.5	$ 2
Total operating expenses		3,097.8	3,231.5
Net settlement proceeds		0.1	47
Gain (loss) on sale of assets		(0.1)	0.3
Income (loss) from operations		18.6	60
Other income (expense)
Interest income		0.7	0.3
Interest expense		(13.6)	(13)
Other nonoperating income (expense)		0.2	0
Total other income (expense)		(12.7)	(12.7)
Income (loss) before income taxes		5.9	47.3
Income tax expense (benefit)		0.6	8
Income (loss)		5.3	39.3
Equity earnings in affiliates, net of tax		0	0
Net Income (Loss)		5.3	39.3
Eliminations
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Depreciation and amortization		0	0
Selling, general and administrative		0	0
Accretion of asset retirement obligations		0	0
Total operating expenses		0	0
Net settlement proceeds		0	0
Gain (loss) on sale of assets		0	0
Income (loss) from operations		0	0
Other income (expense)
Interest income		0	0
Interest expense		0	0
Other nonoperating income (expense)		0	0
Total other income (expense)		0	0
Income (loss) before income taxes		0	0
Income tax expense (benefit)		0	0
Income (loss)		0	0
Equity earnings in affiliates, net of tax		(5.1)	(39.3)
Net Income (Loss)		(5.1)	(39.3)
Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Depreciation and amortization		0	0
Selling, general and administrative		0	0
Accretion of asset retirement obligations		0	0
Total operating expenses		0	0
Net settlement proceeds		0	0
Gain (loss) on sale of assets		0	0
Income (loss) from operations		0	0
Other income (expense)
Interest income		0	0
Interest expense		0	0
Other nonoperating income (expense)		0	0
Total other income (expense)		0	0
Income (loss) before income taxes		0	0
Income tax expense (benefit)		0	0
Income (loss)		0	0
Equity earnings in affiliates, net of tax		5.3	39.3
Net Income (Loss)		5.3	39.3
Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		3,116.4	3,244.2
Operating Expenses
Depreciation and amortization		39.7	31.8
Selling, general and administrative		34.6	34.5
Accretion of asset retirement obligations		0.5	0.5
Total operating expenses		3,097.8	3,231.5
Net settlement proceeds		0.1	47
Gain (loss) on sale of assets		(0.1)	0.3
Income (loss) from operations		18.6	60
Other income (expense)
Interest income		0.7	0.3
Interest expense		(13.6)	(13)
Other nonoperating income (expense)		0.4	0
Total other income (expense)		(12.5)	(12.7)
Income (loss) before income taxes		6.1	47.3
Income tax expense (benefit)		0.6	8
Income (loss)		5.5	39.3
Equity earnings in affiliates, net of tax		(0.2)	0
Net Income (Loss)		5.3	39.3
Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Depreciation and amortization		0	0
Selling, general and administrative		0	0
Accretion of asset retirement obligations		0	0
Total operating expenses		0	0
Net settlement proceeds		0	0
Gain (loss) on sale of assets		0	0
Income (loss) from operations		0	0
Other income (expense)
Interest income		0	0
Interest expense		0	0
Other nonoperating income (expense)		(0.2)	0
Total other income (expense)		(0.2)	0
Income (loss) before income taxes		(0.2)	0
Income tax expense (benefit)		0	0
Income (loss)		(0.2)	0
Equity earnings in affiliates, net of tax		0	0
Net Income (Loss)		(0.2)	0
Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Depreciation and amortization		0	0
Selling, general and administrative		0	0
Accretion of asset retirement obligations		0	0
Total operating expenses		0	0
Net settlement proceeds		0	0
Gain (loss) on sale of assets		0	0
Income (loss) from operations		0	0
Other income (expense)
Interest income		0	0
Interest expense		0	0
Other nonoperating income (expense)		0	0
Total other income (expense)		0	0
Income (loss) before income taxes		0	0
Income tax expense (benefit)		0	0
Income (loss)		0	0
Equity earnings in affiliates, net of tax		0	0
Net Income (Loss)		0	0
Product
Operating Revenues
Total operating revenues	[1]	2,499.8	2,637.6
Operating Expenses
Operating expenses	[1]	2,381.5	2,561.1
Product | Eliminations
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Product | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Product | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		2,499.8	2,637.6
Operating Expenses
Operating expenses		2,381.5	2,561.1
Product | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Product | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Merchandise
Operating Revenues
Total operating revenues		606.2	567.7
Operating Expenses
Operating expenses		508.7	476.2
Merchandise | Eliminations
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Merchandise | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Merchandise | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		606.2	567.7
Operating Expenses
Operating expenses		508.7	476.2
Merchandise | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Merchandise | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Other
Operating Revenues
Total operating revenues		10.4	38.9
Operating Expenses
Operating expenses		132.8	127.4
Other | Eliminations
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Other | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Other | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		10.4	38.9
Operating Expenses
Operating expenses		132.8	127.4
Other | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		0	0
Other | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0	0
Operating Expenses
Operating expenses		$ 0	$ 0
[1]	Three Months EndedMarch 31, Three Months EndedMarch 31,(Millions of dollars, except per share amounts) 2019 2018(a) Includes excise taxes of: $455.3 $434.4

Guarantor Subsidiaries (Conso_4

Guarantor Subsidiaries (Consolidating Statement Of Cash Flow) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Operating Activities
Net income (loss)	$ 5.3	$ 39.3
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	39.7	31.8
Deferred and noncurrent income tax charges (credits)	(2.4)	1.1
Accretion of asset retirement obligations	0.5	0.5	$ 2
(Gain) loss on sale of assets	0.1	(0.3)
Net (increase) decrease in noncash operating working capital	1.7	36
Equity in earnings of affiliates	0	0
Other operating activities - net	3.2	(1)
Net cash provided by (required by) operating activities	48.1	107.4
Investing Activities
Property additions	(30.5)	(48.7)
Proceeds from sale of assets	1.1	1.1
Other investing activities - net	(0.1)	(4.7)
Net cash provided by (required by) investing activities	(29.5)	(52.3)
Financing Activities
Purchase of treasury stock	(13.3)	(71.7)
Borrowings of debt	0	0
Repayments of debt	(5.4)	(5.3)
Debt issuance costs	0	0
Amounts related to share-based compensation	(4)	(2.9)
Net distributions to parent	0	0
Net cash provided by (required by) financing activities	(22.7)	(79.9)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(4.1)	(24.8)
Cash and cash equivalents at beginning of period	184.5	170	170
Restricted cash at beginning of period	0	0	0
Cash, cash equivalents, and restricted cash at beginning of period	184.5	170	170
Cash and cash equivalents at end of period	180.4	144.1	184.5
Restricted cash at end of period	0	1.1	0
Cash, cash equivalents, and restricted cash at end of period	180.4	145.2	184.5
Eliminations
Operating Activities
Net income (loss)	(5.1)	(39.3)
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0	0
Deferred and noncurrent income tax charges (credits)	0	0
Accretion of asset retirement obligations	0	0
(Gain) loss on sale of assets	0	0
Net (increase) decrease in noncash operating working capital	0	0
Equity in earnings of affiliates	5.1	39.3
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	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 and cash equivalents at beginning of period	0	0	0
Restricted cash at beginning of period	0	0	0
Cash, cash equivalents, and restricted cash at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Restricted cash at end of period	0	0	0
Cash, cash equivalents, and restricted cash at end of period	0	0	0
Parent Company | Reportable Legal Entities
Operating Activities
Net income (loss)	5.3	39.3
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0	0
Deferred and noncurrent income tax charges (credits)	0	0
Accretion of asset retirement obligations	0	0
(Gain) loss on sale of assets	0	0
Net (increase) decrease in noncash operating working capital	0	0
Equity in earnings of affiliates	(5.3)	(39.3)
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	(13.3)	(71.7)
Borrowings of debt	0	0
Repayments of debt	0	0
Debt issuance costs	0	0
Amounts related to share-based compensation	0	0
Net distributions to parent	13.3	71.7
Net cash provided by (required by) financing activities	0	0
Net increase (decrease) in cash, cash equivalents, and restricted cash	0	0
Cash and cash equivalents at beginning of period	0	0	0
Restricted cash at beginning of period	0	0	0
Cash, cash equivalents, and restricted cash at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Restricted cash at end of period	0	0	0
Cash, cash equivalents, and restricted cash at end of period	0	0	0
Issuer | Reportable Legal Entities
Operating Activities
Net income (loss)	5.3	39.3
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	39.7	31.8
Deferred and noncurrent income tax charges (credits)	(2.4)	1.1
Accretion of asset retirement obligations	0.5	0.5
(Gain) loss on sale of assets	0.1	(0.3)
Net (increase) decrease in noncash operating working capital	1.7	36
Equity in earnings of affiliates	0.2	0
Other operating activities - net	3.2	(1)
Net cash provided by (required by) operating activities	48.3	107.4
Investing Activities
Property additions	(28.8)	(48.3)
Proceeds from sale of assets	1.1	1.1
Other investing activities - net	(0.1)	(4.7)
Net cash provided by (required by) investing activities	(27.8)	(51.9)
Financing Activities
Purchase of treasury stock	0	0
Borrowings of debt	0	0
Repayments of debt	(5.4)	(5.3)
Debt issuance costs	0	0
Amounts related to share-based compensation	(4)	(2.9)
Net distributions to parent	(15.2)	(72.3)
Net cash provided by (required by) financing activities	(24.6)	(80.5)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(4.1)	(25)
Cash and cash equivalents at beginning of period	184	169.9	169.9
Restricted cash at beginning of period	0	0	0
Cash, cash equivalents, and restricted cash at beginning of period	184	169.9	169.9
Cash and cash equivalents at end of period	179.9	143.8	184
Restricted cash at end of period	0	1.1	0
Cash, cash equivalents, and restricted cash at end of period	179.9	144.9	184
Guarantor Subsidiaries | Reportable Legal Entities
Operating Activities
Net income (loss)	(0.2)	0
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0	0
Deferred and noncurrent income tax charges (credits)	0	0
Accretion of asset retirement obligations	0	0
(Gain) loss on sale of assets	0	0
Net (increase) decrease in noncash operating working capital	0	0
Equity in earnings of affiliates	0	0
Other operating activities - net	0	0
Net cash provided by (required by) operating activities	(0.2)	0
Investing Activities
Property additions	(1.7)	(0.4)
Proceeds from sale of assets	0	0
Other investing activities - net	0	0
Net cash provided by (required by) investing activities	(1.7)	(0.4)
Financing Activities
Purchase of treasury stock	0	0
Borrowings of debt	0	0
Repayments of debt	0	0
Debt issuance costs	0	0
Amounts related to share-based compensation	0	0
Net distributions to parent	1.9	0.6
Net cash provided by (required by) financing activities	1.9	0.6
Net increase (decrease) in cash, cash equivalents, and restricted cash	0	0.2
Cash and cash equivalents at beginning of period	0.5	0.1	0.1
Restricted cash at beginning of period	0	0	0
Cash, cash equivalents, and restricted cash at beginning of period	0.5	0.1	0.1
Cash and cash equivalents at end of period	0.5	0.3	0.5
Restricted cash at end of period	0	0	0
Cash, cash equivalents, and restricted cash at end of period	0.5	0.3	0.5
Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Activities
Net income (loss)	0	0
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities
Depreciation and amortization	0	0
Deferred and noncurrent income tax charges (credits)	0	0
Accretion of asset retirement obligations	0	0
(Gain) loss on sale of assets	0	0
Net (increase) decrease in noncash operating working capital	0	0
Equity in earnings of affiliates	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	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 and cash equivalents at beginning of period	0	0	0
Restricted cash at beginning of period	0	0	0
Cash, cash equivalents, and restricted cash at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Restricted cash at end of period	0	0	0
Cash, cash equivalents, and restricted cash at end of period	$ 0	$ 0	$ 0

Guarantor Subsidiaries (Conso_5

Guarantor Subsidiaries (Consolidating Statement Of Changes In Equity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 807.3	$ 738.4
Issuance of treasury stock	0	0
Purchase of treasury stock	(13.3)	(71.7)
Amounts related to share-based compensation	(4.1)	(2.9)
Share-based compensation expense	2.6	2.2
Net income (loss)	5.3	39.3
Ending balance	797.8	705.3
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0.5	0.5
Issuance of common stock	0	0
Ending balance	0.5	0.5
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(940.3)	(806.5)
Issuance of treasury stock	5.6	4.4
Purchase of treasury stock	(13.3)	(71.7)
Ending balance	(948)	(873.8)
APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	539	549.9
Issuance of treasury stock	(5.6)	(4.4)
Amounts related to share-based compensation	(4.1)	(2.9)
Share-based compensation expense	2.6	2.2
Ending balance	531.9	544.8
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,208.1	994.5
Net income (loss)	5.3	39.3
Ending balance	1,213.4	1,033.8
Eliminations
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,581.4)
Net income (loss)	(5.1)	(39.3)
Ending balance	(2,586.5)
Eliminations | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(0.1)	(0.1)
Ending balance	(0.1)	(0.1)
Eliminations | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0
Ending balance	0	0
Eliminations | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,368.4)	(1,368.4)
Ending balance	(1,368.4)	(1,368.4)
Eliminations | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,212.9)	(999.8)
Net income (loss)	(5.1)	(39.3)
Ending balance	(1,218)	(1,039.1)
Issuer | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	745.7
Net income (loss)	5.3	39.3
Ending balance	749.5
Issuer | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0
Ending balance	0	0
Issuer | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0
Ending balance	0	0
Issuer | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	572.8	573.1
Amounts related to share-based compensation	(4.1)	(2.9)
Share-based compensation expense	2.6	2.2
Ending balance	571.3	572.4
Issuer | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	172.9	933
Net income (loss)	5.3	39.3
Ending balance	178.2	972.3
Parent Company | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,437.1
Net income (loss)	5.3	39.3
Ending balance	2,429.1
Parent Company | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0.5	0.5
Ending balance	0.5	0.5
Parent Company | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(940.3)	(806.5)
Issuance of treasury stock	5.6	4.4
Purchase of treasury stock	(13.3)	(71.7)
Ending balance	(948)	(873.8)
Parent Company | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,195.1	1,205.7
Issuance of treasury stock	(5.6)	(4.4)
Ending balance	1,189.5	1,201.3
Parent Company | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,181.8	994.5
Net income (loss)	5.3	39.3
Ending balance	2,187.1	1,033.8
Guarantor Subsidiaries | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	51.6
Net income (loss)	(0.2)	0
Ending balance	51.4
Guarantor Subsidiaries | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0.1	0.1
Ending balance	0.1	0.1
Guarantor Subsidiaries | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0
Ending balance	0	0
Guarantor Subsidiaries | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	52	52
Ending balance	52	52
Guarantor Subsidiaries | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(0.5)	0
Net income (loss)	(0.2)	0
Ending balance	(0.7)	0
Non-Guarantor Subsidiaries | Reportable Legal Entities
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	154.3
Net income (loss)	0	0
Ending balance	154.3
Non-Guarantor Subsidiaries | Reportable Legal Entities | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0
Ending balance	0	0
Non-Guarantor Subsidiaries | Reportable Legal Entities | Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0
Ending balance	0	0
Non-Guarantor Subsidiaries | Reportable Legal Entities | APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	87.5	87.5
Ending balance	87.5	87.5
Non-Guarantor Subsidiaries | Reportable Legal Entities | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	66.8	66.8
Net income (loss)	0	0
Ending balance	$ 66.8	$ 66.8