CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Revenues:
Transportation	$ 1,152.6	$ 1,117.9	$ 1,146.2
Storage, parking and lending	110.4	110.5	92.0
Other	77.1	69.2	57.0
Total operating revenues	1,340.1	1,297.6	1,295.2
Operating Costs and Expenses:
Fuel and transportation	22.1	18.3	13.8
Operation and maintenance	226.9	212.3	219.1
Administrative and general	144.6	139.9	141.1
Depreciation and amortization	366.3	358.8	346.1
(Gain) loss on sale of assets and impairments	(0.1)	0.9	(3.2)
Taxes other than income taxes	113.2	112.8	104.6
Total operating costs and expenses	873.0	843.0	821.5
Operating income	467.1	454.6	473.7
Other Deductions (Income):
Interest expense	160.8	169.7	178.7
Interest income	0.0	0.0	(0.3)
Miscellaneous other income, net	(9.4)	(5.9)	(0.9)
Total other deductions	151.4	163.8	177.5
Income before income taxes	315.7	290.8	296.2
Income taxes	0.7	0.3	0.5
Net income	$ 315.0	$ 290.5	$ 295.7