CONDENSED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
OPERATING REVENUES	$ 716.8	$ 743.9	$ 1,759.2	$ 1,728.4
COST OF SALES	255.7	269.8	696.5	645.4
OPERATING EXPENSES
Other operation and maintenance	120.2	115.2	362.8	356.3
Depreciation and amortization	76.2	80.8	204.6	235.9
Taxes other than income	21.7	20.9	64.2	63.6
Total operating expenses	218.1	216.9	631.6	655.8
OPERATING INCOME	243.0	257.2	431.1	427.2
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	11.8	3.9	27.2	9.2
Other income	13.4	2.9	27.5	11.3
Other expense	(0.5)	(0.8)	(1.5)	(2.2)
Net other income	24.7	6.0	53.2	18.3
INTEREST EXPENSE
Interest on long-term debt	38.3	35.4	112.4	106.3
Allowance for borrowed funds used during construction	(5.2)	(2.0)	(12.6)	(4.7)
Interest on short-term debt and other interest charges	1.4	0.9	3.9	3.2
Interest expense	34.5	34.3	103.7	104.8
INCOME BEFORE TAXES	233.2	228.9	380.6	340.7
INCOME TAX EXPENSE	71.7	69.0	116.7	102.4
NET INCOME	161.5	159.9	263.9	238.3
Other comprehensive income (loss), net of tax	0.0	0.0	0.0	0.0
COMPREHENSIVE INCOME	$ 161.5	$ 159.9	$ 263.9	$ 238.3