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Guarantor Subsidiaries (Consolidating Income Statement) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating Revenues
Total operating revenues		$ 3,788.0	$ 3,236.3	$ 10,861.2	$ 9,447.0
Operating Expenses
Depreciation and amortization		34.2	29.0	99.0	83.5
Selling, general and administrative		32.6	31.5	102.3	101.1
Accretion of asset retirement obligations		0.5	0.4	1.5	1.3	$ 1.8
Total operating expenses		3,717.5	3,118.3	10,698.8	9,225.0
Net settlement proceeds		0.0	0.0	50.4	0.0
Gain (loss) on sale of assets		(0.5)	0.0	(0.7)	(3.4)
Income (loss) from operations		70.0	118.0	212.1	218.6
Other income (expense)
Interest income		0.2	0.4	0.8	0.8
Interest expense		(13.2)	(12.7)	(39.6)	(33.8)
Other nonoperating income (expense)		0.0	3.0	0.1	3.2
Total other income (expense)		(13.0)	(9.3)	(38.7)	(29.8)
Income (loss) before income taxes		57.0	108.7	173.4	188.8
Income tax expense (benefit)		12.0	40.8	37.3	68.4
Income (loss)		45.0	67.9	136.1	120.4
Equity earnings in affiliates, net of tax		0.0	0.0	0.0	0.0
Net Income (Loss)		45.0	67.9	136.1	120.4
Eliminations
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Depreciation and amortization		0.0	0.0	0.0	0.0
Selling, general and administrative		0.0	0.0	0.0	0.0
Accretion of asset retirement obligations		0.0	0.0	0.0	0.0
Total operating expenses		0.0	0.0	0.0	0.0
Net settlement proceeds		0.0	0.0	0.0	0.0
Gain (loss) on sale of assets		0.0	0.0	0.0	0.0
Income (loss) from operations		0.0	0.0	0.0	0.0
Other income (expense)
Interest income		0.0	0.0	0.0	0.0
Interest expense		0.0	0.0	0.0	0.0
Other nonoperating income (expense)		0.0	0.0	0.0	0.0
Total other income (expense)		0.0	0.0	0.0	0.0
Income (loss) before income taxes		0.0	0.0	0.0	0.0
Income tax expense (benefit)		0.0	0.0	0.0	0.0
Income (loss)		0.0	0.0	0.0	0.0
Equity earnings in affiliates, net of tax		(45.0)	(67.9)	(136.0)	(120.4)
Net Income (Loss)		(45.0)	(67.9)	(136.0)	(120.4)
Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Depreciation and amortization		0.0	0.0	0.0	0.0
Selling, general and administrative		0.0	0.0	0.0	0.0
Accretion of asset retirement obligations		0.0	0.0	0.0	0.0
Total operating expenses		0.0	0.0	0.0	0.0
Net settlement proceeds		0.0	0.0	0.0	0.0
Gain (loss) on sale of assets		0.0	0.0	0.0	0.0
Income (loss) from operations		0.0	0.0	0.0	0.0
Other income (expense)
Interest income		0.0	0.0	0.0	0.0
Interest expense		0.0	0.0	0.0	0.0
Other nonoperating income (expense)		0.0	0.0	0.0	0.0
Total other income (expense)		0.0	0.0	0.0	0.0
Income (loss) before income taxes		0.0	0.0	0.0	0.0
Income tax expense (benefit)		0.0	0.0	0.0	0.0
Income (loss)		0.0	0.0	0.0	0.0
Equity earnings in affiliates, net of tax		45.0	67.9	136.1	120.4
Net Income (Loss)		45.0	67.9	136.1	120.4
Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		3,788.0	3,236.3	10,861.2	9,447.0
Operating Expenses
Depreciation and amortization		34.2	29.0	99.0	83.5
Selling, general and administrative		32.6	31.5	102.3	101.1
Accretion of asset retirement obligations		0.5	0.4	1.5	1.3
Total operating expenses		3,717.5	3,118.3	10,698.8	9,225.0
Net settlement proceeds		0.0	0.0	50.4	0.0
Gain (loss) on sale of assets		(0.5)	0.0	(0.7)	(3.4)
Income (loss) from operations		70.0	118.0	212.1	218.6
Other income (expense)
Interest income		0.2	0.4	0.8	0.8
Interest expense		(13.2)	(12.7)	(39.6)	(33.8)
Other nonoperating income (expense)		0.0	3.0	0.2	3.2
Total other income (expense)		(13.0)	(9.3)	(38.6)	(29.8)
Income (loss) before income taxes		57.0	108.7	173.5	188.8
Income tax expense (benefit)		12.0	40.8	37.3	68.4
Income (loss)		45.0	67.9	136.2	120.4
Equity earnings in affiliates, net of tax		0.0	0.0	(0.1)	0.0
Net Income (Loss)		45.0	67.9	136.1	120.4
Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Depreciation and amortization		0.0	0.0	0.0	0.0
Selling, general and administrative		0.0	0.0	0.0	0.0
Accretion of asset retirement obligations		0.0	0.0	0.0	0.0
Total operating expenses		0.0	0.0	0.0	0.0
Net settlement proceeds		0.0	0.0	0.0	0.0
Gain (loss) on sale of assets		0.0	0.0	0.0	0.0
Income (loss) from operations		0.0	0.0	0.0	0.0
Other income (expense)
Interest income		0.0	0.0	0.0	0.0
Interest expense		0.0	0.0	0.0	0.0
Other nonoperating income (expense)		0.0	0.0	(0.1)	0.0
Total other income (expense)		0.0	0.0	(0.1)	0.0
Income (loss) before income taxes		0.0	0.0	(0.1)	0.0
Income tax expense (benefit)		0.0	0.0	0.0	0.0
Income (loss)		0.0	0.0	(0.1)	0.0
Equity earnings in affiliates, net of tax		0.0	0.0	0.0	0.0
Net Income (Loss)		0.0	0.0	(0.1)	0.0
Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Depreciation and amortization		0.0	0.0	0.0	0.0
Selling, general and administrative		0.0	0.0	0.0	0.0
Accretion of asset retirement obligations		0.0	0.0	0.0	0.0
Total operating expenses		0.0	0.0	0.0	0.0
Net settlement proceeds		0.0	0.0	0.0	0.0
Gain (loss) on sale of assets		0.0	0.0	0.0	0.0
Income (loss) from operations		0.0	0.0	0.0	0.0
Other income (expense)
Interest income		0.0	0.0	0.0	0.0
Interest expense		0.0	0.0	0.0	0.0
Other nonoperating income (expense)		0.0	0.0	0.0	0.0
Total other income (expense)		0.0	0.0	0.0	0.0
Income (loss) before income taxes		0.0	0.0	0.0	0.0
Income tax expense (benefit)		0.0	0.0	0.0	0.0
Income (loss)		0.0	0.0	0.0	0.0
Equity earnings in affiliates, net of tax		0.0	0.0	0.0	0.0
Net Income (Loss)		0.0	0.0	0.0	0.0
Merchandise
Operating Revenues
Total operating revenues		623.7	605.6	1,807.5	1,777.1
Operating Expenses
Petroleum product cost of goods sold		519.2	507.9	1,509.2	1,492.9
Operating expenses		519.2	507.9	1,509.2	1,492.9
Merchandise | Eliminations
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Merchandise | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Merchandise | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		623.7	605.6	1,807.5	1,777.1
Operating Expenses
Operating expenses		519.2	507.9	1,509.2	1,492.9
Merchandise | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Merchandise | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Other
Operating Revenues
Total operating revenues		12.8	49.8	70.9	119.0
Operating Expenses
Petroleum product cost of goods sold		139.7	130.4	401.9	384.6
Operating expenses		139.7	130.4	401.9	384.6
Other | Eliminations
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Other | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Other | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		12.8	49.8	70.9	119.0
Operating Expenses
Operating expenses		139.7	130.4	401.9	384.6
Other | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Other | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Operating expenses		0.0	0.0	0.0	0.0
Product
Operating Revenues
Total operating revenues	[1]	3,151.5	2,580.9	8,982.8	7,550.9
Operating Expenses
Petroleum product cost of goods sold	[1]	2,991.3	2,419.1	8,584.9	7,161.6
Product | Eliminations
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Petroleum product cost of goods sold		0.0	0.0	0.0	0.0
Product | Parent Company | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Petroleum product cost of goods sold		0.0	0.0	0.0	0.0
Product | Issuer | Reportable Legal Entities
Operating Revenues
Total operating revenues		3,151.5	2,580.9	8,982.8	7,550.9
Operating Expenses
Petroleum product cost of goods sold		2,991.3	2,419.1	8,584.9	7,161.6
Product | Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Petroleum product cost of goods sold		0.0	0.0	0.0	0.0
Product | Non-Guarantor Subsidiaries | Reportable Legal Entities
Operating Revenues
Total operating revenues		0.0	0.0	0.0	0.0
Operating Expenses
Petroleum product cost of goods sold		$ 0.0	$ 0.0	$ 0.0	$ 0.0
[1] Three Months EndedSeptember 30, Nine Months EndedSeptember 30,(Millions of dollars, except per share amounts) 2018 2017 2018 2017(a) Includes excise taxes of: $464.1 $488.8 $1,364.8 $1,473.4

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