Consolidated Condensed Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities
Net Income	$ 207.6	$ 176.6
Reconciliation to cash
Depreciation and amortization	103.7	98.2
Deferred income taxes and investment tax credits, net	111.6	101.8
Contributions to qualified benefit plans	0	0
Change in -
Accounts receivable and accrued revenues	(184.8)	(84.3)
Inventories	94.5	93.9
Other current assets	28.9	28.2
Accounts payable	94.7	(104.5)
Accrued income taxes, net	1.4	(12.8)
Other current liabilities	(33.5)	35.6
Other, net	(39.0)	(2.4)
Cash Provided by Operating Activities	385.1	330.3
Investing Activities
Capital expenditures	(129.2)	(133.6)
Investment in transmission affiliate	(3.9)	(1.3)
Change in restricted cash	0	0
Other, net	(6.0)	(10.4)
Cash Used in Investing Activities	(139.1)	(145.3)
Financing Activities
Exercise of stock options	15.2	27.3
Purchase of common stock	(52.6)	(66.5)
Dividends paid on common stock	(88.1)	(77.8)
Issuance of long-term debt	0	0
Retirement of long-term debt	(8.9)	(8.5)
Change in short-term debt	(115.2)	(77.9)
Other, net	5.2	7.5
Cash Used in Financing Activities	(244.4)	(195.9)
Change in Cash and Cash Equivalents	1.6	(10.9)
Cash and Cash Equivalents at Beginning of Period	26.0	35.6
Cash and Cash Equivalents at End of Period	$ 27.6	$ 24.7