CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating Revenues:
Transportation	$ 297.9	$ 272.8	$ 641.2	$ 598.4
Storage, parking and lending	43.3	32.4	76.0	61.5
Other	17.5	17.7	35.8	40.9
Total operating revenues	358.7	322.9	753.0	700.8
Operating Costs and Expenses:
Fuel and transportation	4.6	7.9	12.6	13.2
Operation and maintenance	70.4	57.0	127.7	103.9
Administrative and general	40.2	35.0	82.5	72.5
Depreciation and amortization	101.2	98.4	201.0	191.6
Loss on sale of assets and impairments	0.1	0.8	0.1	0.8
Taxes other than income taxes	29.8	28.4	60.2	58.3
Total operating costs and expenses	246.3	227.5	484.1	440.3
Operating income	112.4	95.4	268.9	260.5
Other Deductions (Income):
Interest expense	39.1	41.8	78.0	84.3
Interest income	(4.3)	(0.1)	(6.0)	(0.1)
Miscellaneous other income, net	(1.3)	(1.3)	(1.3)	(4.1)
Total other deductions	33.5	40.4	70.7	80.1
Income before income taxes	78.9	55.0	198.2	180.4
Income taxes	0.2	0.2	0.5	0.4
Net income	$ 78.7	$ 54.8	$ 197.7	$ 180.0