Consolidated Condensed Income Statements (Unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Operating Revenues	$ 1,052.8	$ 973.2	$ 3,373.2	$ 3,112.7
Operating Expenses
Fuel and purchased power	350.9	335.6	904.5	871.4
Cost of gas sold	69.2	67.4	533.4	519.0
Other operation and maintenance	296.9	318.1	909.3	971.0
Depreciation and amortization	82.6	77.4	246.2	228.6
Property and revenue taxes	28.9	26.9	85.5	79.8
Total Operating Expenses	828.5	825.4	2,678.9	2,669.8
Amortization of Gain	0	55.2	0	151.8
Operating Income	224.3	203.0	694.3	594.7
Equity in earnings of transmission affiliate	15.7	15.2	46.4	45.5
Other Income, net	16.2	9.6	43.1	25.5
Interest Expense, net	56.8	52.5	177.6	154.9
Income from Continuing Operations Before Income Taxes	199.4	175.3	606.2	510.8
Income Taxes	69.6	63.0	207.5	182.0
Income from Continuing Operations	129.8	112.3	398.7	328.8
Income (Loss) from Discontinued Operations, Net of Tax	0	(0.1)	11.5	1.8
Net Income	$ 129.8	$ 112.2	$ 410.2	$ 330.6
Earnings Per Share (Basic)
Continuing operations	$ 0.56	$ 0.48	$ 1.71	$ 1.41
Discontinued operations	$ 0.00	$ 0.00	$ 0.05	$ 0.00
Total Earnings Per Share (Basic)	$ 0.56	$ 0.48	$ 1.76	$ 1.41
Earnings Per Share (Diluted)
Continuing operations	$ 0.55	$ 0.47	$ 1.69	$ 1.39
Discontinued operations	$ 0.00	$ 0.00	$ 0.05	$ 0.01
Total Earnings Per Share (Diluted)	$ 0.55	$ 0.47	$ 1.74	$ 1.40
Weighted Average Common Shares Outstanding (Millions)
Basic	232.2	233.8	233.2	233.8
Diluted	234.9	236.9	236.0	236.7
Dividends Per Share of Common Stock	$ 0.26	$ 0.20	$ 0.78	$ 0.60