CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING REVENUES
OPERATING REVENUES	$ 433.1	$ 480.1
COST OF SALES
COST OF SALES	177.9	211.6
OPERATING EXPENSES
Other operation and maintenance	113.9	111.7
Depreciation and amortization	78.5	75.9
Taxes other than income	24.9	24.5
Total operating expenses	217.3	212.1
OPERATING INCOME	37.9	56.4
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates	28.3	31.7
Allowance for equity funds used during construction	1.6	1.5
Other income	5.6	4.9
Other expense	(1.7)	(1.0)
Net other income	33.8	37.1
INTEREST EXPENSE
Interest on long-term debt	35.8	36.9
Allowance for borrowed funds used during construction	(0.9)	(0.8)
Interest on short-term debt and other interest charges	1.4	1.3
Interest expense	36.3	37.4
INCOME BEFORE TAXES	35.4	56.1
INCOME TAX EXPENSE	10.2	12.9
NET INCOME	$ 25.2	$ 43.2
BASIC AVERAGE COMMON SHARES OUTSTANDING	199.7	199.5
DILUTED AVERAGE COMMON SHARES OUTSTANDING	199.7	199.5
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 0.13	$ 0.22
DILUTED EARNINGS PER AVERAGE COMMON SHARE	0.13	0.22
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.27500	$ 0.25000