CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating Revenues:
Transportation	$ 299.7	$ 288.1	$ 940.9	$ 886.5
Storage, parking and lending	39.5	32.0	115.5	93.5
Other	16.5	16.9	52.3	57.8
Total operating revenues	355.7	337.0	1,108.7	1,037.8
Operating Costs and Expenses:
Fuel and transportation	7.0	5.0	19.6	18.2
Operation and maintenance	73.8	67.8	201.5	171.7
Administrative and general	44.2	36.6	126.7	109.1
Depreciation and amortization	101.9	102.4	302.9	294.0
Loss on sale of assets and impairments	0.0	6.3	0.1	7.1
Taxes other than income taxes	27.8	28.6	88.0	86.9
Total operating costs and expenses	254.7	246.7	738.8	687.0
Operating income	101.0	90.3	369.9	350.8
Other Deductions (Income):
Interest expense	38.7	41.8	116.7	126.1
Interest income	(5.7)	(1.1)	(11.7)	(1.2)
Miscellaneous other income, net	(1.3)	(0.9)	(2.6)	(5.0)
Total other deductions	31.7	39.8	102.4	119.9
Income before income taxes	69.3	50.5	267.5	230.9
Income taxes	0.1	0.2	0.6	0.6
Net income	$ 69.2	$ 50.3	$ 266.9	$ 230.3