CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OPERATING REVENUES
OPERATING REVENUES	$ 480.1	$ 560.4
COST OF SALES
COST OF SALES	211.6	293.4
OPERATING EXPENSES
Other operation and maintenance	111.7	112.4
Depreciation and amortization	75.9	67.2
Taxes other than income	24.5	25.6
Total operating expenses	212.1	205.2
OPERATING INCOME	56.4	61.8
OTHER INCOME (EXPENSE)
Equity in earnings of unconsolidated affiliates	31.7	47.9
Allowance for equity funds used during construction	1.5	1.1
Other income	4.9	1.4
Other expense	(1.0)	(3.3)
Net other income	37.1	47.1
INTEREST EXPENSE
Interest on long-term debt	36.9	35.1
Allowance for borrowed funds used during construction	(0.8)	(0.6)
Interest on short-term debt and other interest charges	1.3	1.4
Interest expense	37.4	35.9
INCOME BEFORE TAXES	56.1	73.0
INCOME TAX EXPENSE	12.9	23.7
NET INCOME	$ 43.2	$ 49.3
BASIC AVERAGE COMMON SHARES OUTSTANDING	199.5	198.8
DILUTED AVERAGE COMMON SHARES OUTSTANDING	199.5	199.5
BASIC EARNINGS PER AVERAGE COMMON SHARE	$ 0.22	$ 0.25
DILUTED EARNINGS PER AVERAGE COMMON SHARES	$ 0.22	$ 0.25
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.25000	$ 0.22500