CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ 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	117.7	113.1	356.5	354.6
Depreciation and amortization	76.9	82.2	207.2	240.8
Taxes other than income	23.2	21.5	68.4	66.5
Total operating expenses	217.8	216.8	632.1	661.9
OPERATING INCOME	243.3	257.3	430.6	421.1
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates	33.6	34.5	98.6	79.5
Allowance for equity funds used during construction	11.8	3.9	27.2	9.2
Other income	15.0	5.7	34.1	18.9
Other expense	(2.0)	(3.3)	(9.3)	(10.8)
Net other income	58.4	40.8	150.6	96.8
INTEREST EXPENSE
Interest on long-term debt	38.7	35.8	113.8	107.3
Allowance for borrowed funds used during construction	(5.2)	(2.0)	(12.6)	(4.7)
Interest on short-term debt and other interest charges	2.4	1.6	6.8	5.1
Interest expense	35.9	35.4	108.0	107.7
INCOME BEFORE TAXES	265.8	262.7	473.2	410.2
INCOME TAX EXPENSE	82.4	79.1	149.0	129.9
NET INCOME	$ 183.4	$ 183.6	$ 324.2	$ 280.3
BASIC AVERAGE COMMON SHARES OUTSTANDING	199.7	199.7	199.7	199.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING	200.1	199.9	200.0	199.8
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 0.92	$ 0.92	$ 1.62	$ 1.40
DILUTED EARNINGS PER AVERAGE COMMON SHARE	0.92	0.92	1.62	1.40
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.33250	$ 0.30250	$ 0.93750	$ 0.85250