CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating Revenues:
Transportation	$ 272.9	$ 259.6	$ 870.2	$ 835.3
Parking and lending	4.3	4.9	17.6	13.4
Storage	18.9	23.4	62.2	68.0
Other	4.4	15.4	35.1	37.9
Total operating revenues	300.5	303.3	985.1	954.6
Operating Costs and Expenses:
Fuel and transportation	9.0	19.1	42.7	51.0
Operation and maintenance	49.0	52.1	141.0	143.8
Administrative and general	26.3	34.4	95.1	104.6
Depreciation and amortization	80.6	80.6	241.4	238.7
(Gain) loss on sale of assets and impairments	0.0	(0.1)	47.1	(0.1)
Taxes other than income taxes	24.8	23.5	75.0	72.0
Total operating costs and expenses	189.7	209.6	642.3	610.0
Operating income	110.8	93.7	342.8	344.6
Other Deductions (Income):
Interest expense	41.0	48.4	131.1	136.4
Interest income	0.0	(0.1)	(0.3)	(0.3)
Miscellaneous other income, net	(0.3)	(1.9)	(1.7)	(5.9)
Total other deductions	40.7	46.4	129.1	130.2
Income before income taxes	70.1	47.3	213.7	214.4
Income taxes	0.3	0.0	0.9	0.4
Net income	$ 69.8	$ 47.3	$ 212.8	$ 214.0
Net Income per Unit:
Net income per common unit (in dollars per unit)	$ 0.27	$ 0.19	$ 0.83	$ 0.84
Weighted-average number of common units outstanding (in units)	250.3	250.3	250.3	250.3
Cash distribution declared and paid to common units per common unit (in dollars per unit)	$ 0.10	$ 0.10	$ 0.30	$ 0.30