CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
OPERATING REVENUES	$ 586.4	$ 551.4	$ 1,042.4	$ 984.5
COST OF SALES	232.1	197.7	440.8	375.6
OPERATING EXPENSES
Other operation and maintenance	116.5	124.8	242.6	241.1
Depreciation and amortization	73.7	78.4	128.4	155.1
Taxes other than income	20.2	19.1	42.5	42.7
Total operating expenses	210.4	222.3	413.5	438.9
OPERATING INCOME	143.9	131.4	188.1	170.0
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	8.5	3.7	15.4	5.3
Other income	7.7	4.4	14.1	8.4
Other expense	(0.6)	(1.1)	(1.0)	(1.4)
Net other income	15.6	7.0	28.5	12.3
INTEREST EXPENSE
Interest on long-term debt	38.6	35.4	74.1	70.9
Allowance for borrowed funds used during construction	(4.1)	(1.8)	(7.4)	(2.7)
Interest on short-term debt and other interest charges	1.1	1.4	2.5	2.3
Interest expense	35.6	35.0	69.2	70.5
INCOME BEFORE TAXES	123.9	103.4	147.4	111.8
INCOME TAX EXPENSE	37.7	31.1	45.0	33.4
NET INCOME	86.2	72.3	102.4	78.4
Other comprehensive income (loss), net of tax	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME	$ 86.2	$ 72.3	$ 102.4	$ 78.4