CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Revenues:
Transportation	$ 248.5	$ 272.3	$ 547.0	$ 585.6
Storage, parking and lending	21.6	27.8	46.7	56.6
Other	15.2	17.5	27.0	42.4
Total operating revenues	285.3	317.6	620.7	684.6
Operating Costs and Expenses:
Fuel and transportation	4.1	14.5	8.5	33.7
Operation and maintenance	50.9	51.6	97.3	92.0
Administrative and general	35.7	34.7	67.8	69.8
Depreciation and amortization	84.8	80.2	167.7	160.8
(Gain) loss on sale of assets and impairments	(0.1)	47.1	(0.5)	47.1
Taxes other than income taxes	24.2	22.8	53.5	50.2
Total operating costs and expenses	199.6	250.9	394.3	453.6
Operating income	85.7	66.7	226.4	231.0
Other Deductions (Income):
Interest expense	43.3	43.9	87.4	90.1
Interest income	(0.1)	(0.2)	(0.1)	(0.3)
Miscellaneous other expense (income), net	0.2	(1.1)	(0.6)	(2.4)
Total other deductions	43.4	42.6	86.7	87.4
Income before income taxes	42.3	24.1	139.7	143.6
Income taxes	0.1	0.4	0.3	0.6
Net income	$ 42.2	$ 23.7	$ 139.4	$ 143.0