CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Revenues:
Transportation	$ 269.8	$ 256.9	$ 575.7	$ 546.5
Parking and lending	4.4	2.8	8.5	5.6
Storage	23.6	20.9	44.6	40.2
Other	8.5	18.0	22.5	36.0
Total operating revenues	306.3	298.6	651.3	628.3
Operating Costs and Expenses:
Fuel and transportation	11.6	24.8	31.9	52.9
Operation and maintenance	48.3	53.4	91.7	94.7
Administrative and general	35.5	31.8	70.2	62.4
Depreciation and amortization	79.1	81.0	158.1	162.6
Asset impairment	0.0	0.0	0.0	0.1
Net gain on sale of operating assets	0.0	(0.1)	0.0	(0.1)
Taxes other than income taxes	22.5	21.8	48.5	47.0
Total operating costs and expenses	197.0	212.7	400.4	419.6
Operating income	109.3	85.9	250.9	208.7
Other Deductions (Income):
Interest expense	45.4	45.9	88.0	91.1
Interest income	(0.1)	(0.1)	(0.2)	(0.2)
Miscellaneous other income, net	(1.9)	(0.4)	(4.0)	(0.6)
Total other deductions	43.4	45.4	83.8	90.3
Income before income taxes	65.9	40.5	167.1	118.4
Income taxes	0.2	0.1	0.4	0.3
Net Income	$ 65.7	$ 40.4	$ 166.7	$ 118.1
Net Income per Unit:
Net income per common unit (in units)	$ 0.26	$ 0.16	$ 0.65	$ 0.47
Weighted-average number of common units outstanding (in units)	250.3	250.3	250.3	247.3
Cash distribution declared and paid to common units (in units)	$ 0.10	$ 0.10	$ 0.20	$ 0.20