STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING REVENUES	$ 2,259.2	$ 2,196.9	$ 2,453.1
COST OF SALES	880.1	865.0	1,106.6
OPERATING EXPENSES
Other operation and maintenance	469.8	444.5	453.2
Depreciation and amortization	316.4	299.9	270.8
Taxes other than income	84.0	87.1	84.5
Total operating expenses	870.2	831.5	808.5
OPERATING INCOME	508.9	500.4	538.0
OTHER INCOME (EXPENSE)
Allowance for equity funds used during construction	14.2	8.3	4.2
Other income	16.4	13.3	4.8
Other expense	(2.9)	(1.6)	(1.9)
Net other income	27.7	20.0	7.1
INTEREST EXPENSE
Interest on long-term debt	141.7	146.8	139.7
Allowance for borrowed funds used during construction	(7.5)	(4.2)	(2.4)
Interest on short-term debt and other interest charges	3.9	4.1	4.2
Interest expense	138.1	146.7	141.5
INCOME BEFORE TAXES	398.5	373.7	403.6
INCOME TAX EXPENSE	114.4	104.8	111.6
NET INCOME	284.1	268.9	292.0
Other comprehensive income (loss), net of tax	0.0	0.0	0.0
COMPREHENSIVE INCOME	$ 284.1	$ 268.9	$ 292.0