CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating Revenues:
Transportation	$ 259.6	$ 255.6	$ 835.3	$ 802.1
Parking and lending	4.9	2.3	13.4	7.9
Storage	23.4	20.4	68.0	60.6
Other	15.4	15.8	37.9	51.8
Total operating revenues	303.3	294.1	954.6	922.4
Operating Costs and Expenses:
Fuel and transportation	19.1	25.1	51.0	78.0
Operation and maintenance	52.1	54.0	143.8	148.7
Administrative and general	34.4	31.7	104.6	94.1
Depreciation and amortization	80.6	79.8	238.7	242.4
Asset impairment	0.0	0.0	0.0	0.1
Net gain on sale of operating assets	(0.1)	(0.1)	(0.1)	(0.2)
Taxes other than income taxes	23.5	22.9	72.0	69.9
Total operating costs and expenses	209.6	213.4	610.0	633.0
Operating income	93.7	80.7	344.6	289.4
Other Deductions (Income):
Interest expense	48.4	43.1	136.4	134.2
Interest income	(0.1)	(0.1)	(0.3)	(0.3)
Miscellaneous other income, net	(1.9)	(0.7)	(5.9)	(1.3)
Total other deductions	46.4	42.3	130.2	132.6
Income before income taxes	47.3	38.4	214.4	156.8
Income taxes	0.0	0.1	0.4	0.4
Net Income	$ 47.3	$ 38.3	$ 214.0	$ 156.4
Net Income per Unit:
Net income per common unit (in dollars per unit)	$ 0.19	$ 0.15	$ 0.84	$ 0.62
Weighted-average number of common units outstanding (in units)	250.3	250.3	250.3	248.3
Cash distribution declared and paid to common units (in dollars per unit)	$ 0.10	$ 0.10	$ 0.30	$ 0.30