Consolidated Condensed Income Statements (Unaudited) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating Revenues	$ 1,033.3	$ 1,053.2	$ 3,772.0	$ 3,340.7
Operating Expenses
Fuel and purchased power	336.8	339.1	947.9	886.2
Cost of gas sold	70.6	61.6	788.0	446.9
Other operation and maintenance	249.4	268.1	780.8	821.6
Depreciation and amortization	103.3	96.9	305.3	289.1
Property and revenue taxes	30.6	29.5	91.5	88.4
Total Operating Expenses	790.7	795.2	2,913.5	2,532.2
Revenue from Grants	3.5	0	10.1	0
Operating Income	246.1	258.0	868.6	808.5
Income (Loss) from Equity Method Investments	18.0	17.1	52.8	51.0
Other Income, net	2.9	5.1	12.1	15.3
Interest Expense, net	60.4	62.0	181.7	190.3
Income from Continuing Operations Before Income Taxes	206.6	218.2	751.8	684.5
Income Tax Expense	80.3	80.7	284.9	251.4
Net Income	126.3	137.5	466.9	433.1
Earnings Per Share (Basic)
Continuing operations	$ 0.56	$ 0.61	$ 2.07	$ 1.90
Earnings Per Share (Diluted)
Continuing operations	$ 0.56	$ 0.60	$ 2.05	$ 1.88
Weighted Average Common Shares Outstanding (Millions)
Basic	225.5	226.8	225.6	228.0
Diluted	227.4	228.8	227.6	230.2
Dividends Per Share of Common Stock	$ 0.39	$ 0.3825	$ 1.17	$ 1.0625
Transmission Affiliate [Member]
Operating Expenses
Income (Loss) from Equity Method Investments	$ 18.0	$ 17.1	$ 52.8	$ 51.0