Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net Income	$ 291.4	$ 280.4
Reconciliation to cash
Depreciation and amortization	183.8	169.2
Deferred income taxes and investment tax credits, net	141.2	137.0
Contributions to qualified benefit plans	0	(122.4)
Change in -
Accounts receivable and accrued revenues	96.2	91.1
Inventories	47.0	40.0
Other current assets	16.7	10.2
Accounts payable	(60.2)	(38.7)
Accrued income taxes, net	5.7	59.2
Other current liabilities	(27.5)	11.4
Other, net	(85.6)	11.2
Cash Provided by Operating Activities	608.7	648.6
Investing Activities
Capital expenditures	(314.0)	(347.1)
Investment in transmission affiliate	(6.6)	(4.6)
Proceeds from asset sales	2.8	38.5
Change in restricted cash	27.6	(37.2)
Other, net	(22.4)	(17.1)
Cash Used in Investing Activities	(312.6)	(367.5)
Financing Activities
Proceeds from Stock Options Exercised	38.6	29.6
Purchase of common stock	(77.0)	(51.6)
Dividends paid on common stock	(138.3)	(121.5)
Issuance of long-term debt	0	420.0
Retirement and repurchase of long-term debt	(10.0)	(456.9)
Change in short-term debt	(110.4)	(115.5)
Other, net	0	0.9
Cash Used in Financing Activities	(297.1)	(295.0)
Change in Cash and Cash Equivalents	(1.0)	(13.9)
Cash and Cash Equivalents at Beginning of Period	14.1	24.5
Cash and Cash Equivalents at End of Period	$ 13.1	$ 10.6