CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ 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	114.8	127.6	238.8	241.5
Depreciation and amortization	74.7	80.1	130.3	158.6
Taxes other than income	21.3	20.1	45.2	45.0
Total operating expenses	210.8	227.8	414.3	445.1
OPERATING INCOME	143.5	125.9	187.3	163.8
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates	29.4	16.7	65.0	45.0
Allowance for equity funds used during construction	8.5	3.7	15.4	5.3
Other income	10.3	7.6	19.1	13.2
Other expense	(3.2)	(5.8)	(7.3)	(7.5)
Net other income	45.0	22.2	92.2	56.0
INTEREST EXPENSE
Interest on long-term debt	39.2	35.7	75.1	71.5
Allowance for borrowed funds used during construction	(4.1)	(1.8)	(7.4)	(2.7)
Interest on short-term debt and other interest charges	2.0	2.1	4.4	3.5
Interest expense	37.1	36.0	72.1	72.3
INCOME BEFORE TAXES	151.4	112.1	207.4	147.5
INCOME TAX EXPENSE	46.6	40.6	66.6	50.8
NET INCOME	$ 104.8	$ 71.5	$ 140.8	$ 96.7
BASIC AVERAGE COMMON SHARES OUTSTANDING	199.7	199.7	199.7	199.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING	199.9	199.8	200.0	199.8
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 0.52	$ 0.35	$ 0.70	$ 0.48
DILUTED EARNINGS PER AVERAGE COMMON SHARE	0.52	0.35	0.70	0.48
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.30250	$ 0.27500	$ 0.60500	$ 0.55000