CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
OPERATING REVENUES	$ 743.9	$ 719.8	$ 1,728.4	$ 1,749.8
COST OF SALES	269.8	259.8	645.4	682.3
OPERATING EXPENSES
Other operation and maintenance	113.1	109.4	354.6	334.3
Depreciation and amortization	82.2	77.9	240.8	230.0
Taxes other than income	21.5	21.9	66.5	68.8
Total operating expenses	216.8	209.2	661.9	633.1
OPERATING INCOME	257.3	250.8	421.1	434.4
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates	34.5	(71.9)	79.5	(12.0)
Allowance for equity funds used during construction	3.9	2.2	9.2	5.4
Other income	5.7	8.9	18.9	19.4
Other expense	(3.3)	(5.3)	(10.8)	(8.5)
Net other income (expense)	40.8	(66.1)	96.8	4.3
INTEREST EXPENSE
Interest on long-term debt	35.8	37.0	107.3	110.9
Allowance for borrowed funds used during construction	(2.0)	(1.1)	(4.7)	(2.7)
Interest on short-term debt and other interest charges	1.6	1.1	5.1	4.2
Interest expense	35.4	37.0	107.7	112.4
INCOME BEFORE TAXES	262.7	147.7	410.2	326.3
INCOME TAX EXPENSE	79.1	36.5	129.9	84.4
NET INCOME	$ 183.6	$ 111.2	$ 280.3	$ 241.9
BASIC AVERAGE COMMON SHARES OUTSTANDING	199.7	199.7	199.7	199.6
DILUTED AVERAGE COMMON SHARES OUTSTANDING	199.9	199.7	199.8	199.6
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 0.92	$ 0.55	$ 1.40	$ 1.21
DILUTED EARNINGS PER AVERAGE COMMON SHARE	0.92	0.55	1.40	1.21
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.30250	$ 0.27500	$ 0.85250	$ 0.77500