CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING REVENUES	$ 456.0	$ 433.1
COST OF SALES	208.7	177.9
OPERATING EXPENSES
Other operation and maintenance	124.0	113.9
Depreciation and amortization	55.6	78.5
Taxes other than income	23.9	24.9
Total operating expenses	203.5	217.3
OPERATING INCOME	43.8	37.9
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates	35.6	28.3
Allowance for equity funds used during construction	6.9	1.6
Other income	8.8	5.6
Other expense	(4.1)	(1.7)
Net other income (expense)	47.2	33.8
INTEREST EXPENSE
Interest on long-term debt	35.9	35.8
Allowance for borrowed funds used during construction	(3.3)	(0.9)
Interest on short-term debt and other interest charges	2.4	1.4
Interest expense	35.0	36.3
INCOME BEFORE TAXES	56.0	35.4
INCOME TAX EXPENSE	20.0	10.2
NET INCOME	$ 36.0	$ 25.2
BASIC AVERAGE COMMON SHARES OUTSTANDING	199.7	199.7
DILUTED AVERAGE COMMON SHARES OUTSTANDING	200.0	199.7
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 0.18	$ 0.13
DILUTED EARNINGS PER AVERAGE COMMON SHARE	0.18	0.13
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.30250	$ 0.27500