CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income	$ 390.4	$ 356.9
Reconciliation to cash provided by operating activities
Depreciation and amortization	208.6	194.6
Deferred income taxes and investment tax credits, net	17.0	150.2
Contributions and payments related to pension and OPEB plans	(5.3)	(106.0)
Equity income in transmission affiliates, net of distributions	7.1	(6.7)
Change in -
Accounts receivable and unbilled revenues	(60.1)	55.0
Materials, supplies, and inventories	163.0	170.5
Other current assets	81.3	41.2
Accounts payable	(170.9)	(212.7)
Other current liabilities	128.6	90.8
Other, net	134.3	(19.2)
Net cash provided by operating activities	894.0	714.6
Investing Activities
Capital expenditures	(439.6)	(329.7)
Capital contributions to transmission affiliates	(12.8)	(27.6)
Proceeds from the sale of assets and businesses	0.8	13.1
Proceeds from the sale of investments held in rabbi trust	16.5	8.6
Other, net	(0.7)	2.5
Net cash used in investing activities	(435.8)	(333.1)
Financing Activities
Exercise of stock options	2.1	5.9
Purchase of common stock	(15.8)	(20.2)
Dividends paid on common stock	(174.2)	(164.1)
Retirement of long-term debt	(12.6)	(12.0)
Change in short-term debt	(244.3)	(189.8)
Other, net	(0.3)	(0.6)
Net cash used in financing activities	(445.1)	(380.8)
Net change in cash, cash equivalents, and restricted cash	13.1	0.7
Cash, cash equivalents, and restricted cash at beginning of period	58.6	72.7
Cash, cash equivalents, and restricted cash at end of period	$ 71.7	$ 73.4