CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
OPERATING REVENUES	$ 551.4	$ 549.9	$ 984.5	$ 1,030.0
COST OF SALES	197.7	210.9	375.6	422.5
OPERATING EXPENSES
Other operation and maintenance	127.6	113.2	241.5	224.9
Depreciation and amortization	80.1	76.2	158.6	152.1
Taxes other than income	20.1	22.4	45.0	46.9
Total operating expenses	227.8	211.8	445.1	423.9
OPERATING INCOME	125.9	127.2	163.8	183.6
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates	16.7	28.2	45.0	59.9
Allowance for equity funds used during construction	3.7	1.7	5.3	3.2
Other income	7.6	5.6	13.2	10.5
Other expense	(5.8)	(2.2)	(7.5)	(3.2)
Net other income	22.2	33.3	56.0	70.4
INTEREST EXPENSE
Interest on long-term debt	35.7	37.0	71.5	73.9
Allowance for borrowed funds used during construction	(1.8)	(0.8)	(2.7)	(1.6)
Interest on short-term debt and other interest charges	2.1	1.8	3.5	3.1
Interest expense	36.0	38.0	72.3	75.4
INCOME BEFORE TAXES	112.1	122.5	147.5	178.6
INCOME TAX EXPENSE	40.6	35.0	50.8	47.9
NET INCOME	$ 71.5	$ 87.5	$ 96.7	$ 130.7
BASIC AVERAGE COMMON SHARES OUTSTANDING	199.7	199.6	199.7	199.6
DILUTED AVERAGE COMMON SHARES OUTSTANDING	199.8	199.6	199.8	199.6
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 0.35	$ 0.44	$ 0.48	$ 0.66
DILUTED EARNINGS PER AVERAGE COMMON SHARE	0.35	0.44	0.48	0.66
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.27500	$ 0.25000	$ 0.55000	$ 0.50000