Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities
Net income	$ 459.2	$ 466.9
Reconciliation to cash
Depreciation and amortization	390.9	312.9
Deferred income taxes and investment tax credits, net	220.1	258.5
Contributions to pension and other postretirement plans	(109.3)	(12.0)
Change in -
Accounts receivable and unbilled revenues	269.5	221.1
Inventories	(101.4)	(49.9)
Other current assets	75.6	37.2
Accounts payable	(55.9)	(27.7)
Accrued taxes, net	57.9	(10.3)
Other current liabilities	40.0	(36.8)
Other, net	(173.4)	(125.3)
Net Cash Provided by Operating Activities	1,073.2	1,034.6
Investing Activities
Capital expenditures	(765.1)	(513.0)
Cost of Removal, Net of Salvage	(26.7)	(18.2)
Business acquisition, net of cash acquired of $156.3 million	(1,329.9)	0.0
Cash acquired from acquisition	156.3
Investment in transmission affiliate	(5.6)	(10.5)
Proceeds from asset sales	26.7	0.0
Other, net	4.7	12.8
Net Cash Used in Investing Activities	(2,095.9)	(528.9)
Financing Activities
Exercise of stock options	26.4	31.7
Purchase of common stock	(66.1)	(84.2)
Dividends paid on common stock	(310.9)	(264.0)
Issuance of long-term debt	1,650.0	250.0
Retirement of long-term debt	(27.1)	(322.0)
Change in short-term debt	(270.5)	(61.6)
Other, net	(18.8)	7.1
Net Cash Provided by (Used in) Financing Activities	983.0	(443.0)
Net Change in Cash and Cash Equivalents	(39.7)	62.7
Cash and Cash Equivalents at Beginning of Period	61.9	26.0
Cash and Cash Equivalents at End of Period	$ 22.2	$ 88.7