CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 621.7	$ 556.3
Reconciliation to cash provided by operating activities
Depreciation and amortization	415.3	392.3
Deferred income taxes and investment tax credits, net	31.7	274.6
Contributions and payments related to pension and OPEB plans	(9.7)	(111.5)
Equity income in transmission affiliates, net of distributions	4.9	(14.5)
Change in -
Accounts receivable and unbilled revenues	235.5	247.3
Materials, supplies, and inventories	72.6	77.9
Other current assets	78.8	14.5
Accounts payable	(85.0)	(114.0)
Other current liabilities	0.1	18.3
Other, net	147.5	(74.3)
Net cash provided by operating activities	1,513.4	1,266.9
Investing Activities
Capital expenditures	(915.5)	(790.0)
Acquisition of Forward Wind Energy Center	(77.1)	0.0
Acquisition of Bluewater	0.0	(226.0)
Capital contributions to transmission affiliates	(32.4)	(50.5)
Proceeds from the sale of assets and businesses	7.9	20.7
Proceeds from the sale of investments held in rabbi trust	16.5	8.6
Other, net	3.8	1.0
Net cash used in investing activities	(996.8)	(1,036.2)
Financing Activities
Exercise of stock options	5.1	15.6
Purchase of common stock	(19.8)	(39.7)
Dividends paid on common stock	(348.7)	(328.3)
Issuance of long-term debt	600.0	210.0
Retirement of long-term debt	(681.4)	(14.6)
Change in short-term debt	(74.6)	(85.4)
Other, net	(3.8)	(2.7)
Net cash used in financing activities	(523.2)	(245.1)
Net change in cash, cash equivalents, and restricted cash	(6.6)	(14.4)
Cash, cash equivalents, and restricted cash at beginning of period	58.6	72.7
Cash, cash equivalents, and restricted cash at end of period	$ 52.0	$ 58.3