Consolidated Statements of Income - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Operating Revenues
Total operating revenues		$ 3,184.8	$ 3,116.4
Operating Expenses
Depreciation and amortization		39.4	39.7
Selling, general and administrative		39.2	34.6
Accretion of asset retirement obligations		0.6	0.5
Total operating expenses		3,054.1	3,097.8
Net settlement proceeds		0.0	0.1
Gain (loss) on sale of assets		0.1	(0.1)
Income (loss) from operations		130.8	18.6
Other income (expense)
Interest income		0.8	0.7
Interest expense		(13.3)	(13.6)
Other nonoperating income (expense)		(1.0)	0.2
Total other income (expense)		(13.5)	(12.7)
Income (loss) before income taxes		117.3	5.9
Income tax expense (benefit)		28.0	0.6
Net Income (Loss) Attributable to Parent, Total		$ 89.3	$ 5.3
Basic and Diluted Earnings Per Common Share
Basic (in dollars per share)		$ 2.95	$ 0.16
Diluted (in dollars per share)		$ 2.92	$ 0.16
Weighted-Average Common Shares Outstanding:
Basic (in shares)		30,235	32,206
Diluted (in shares)		30,541	32,420
Supplemental information:
Excise taxes	[1]	$ 473.5	$ 455.3
Product
Operating Revenues
Total operating revenues		2,480.2	2,499.8
Operating Expenses
Operating expenses		2,259.8	2,381.5
Merchandise sales
Operating Revenues
Total operating revenues		687.5	606.2
Operating Expenses
Operating expenses		580.0	508.7
Other operating revenues
Operating Revenues
Total operating revenues		17.1	10.4
Operating Expenses
Operating expenses		$ 135.1	$ 132.8

[1] Includes excise taxes of $473.5 million for the three months ended March 31, 2020, $455.3 million the three months ended March 31, 2019.