CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net income	$ 420.4	$ 390.4
Reconciliation to cash provided by operating activities
Depreciation and amortization	226.4	208.6
Deferred income taxes and investment tax credits, net	17.2	17.0
Contributions and payments related to pension and OPEB plans	(4.2)	(5.3)
Equity income in transmission affiliates, net of distributions	(1.9)	7.1
Change in –
Accounts receivable and unbilled revenues	(124.3)	(60.1)
Materials, supplies, and inventories	218.3	163.0
Other current assets	125.1	81.3
Accounts payable	(204.3)	(170.9)
Other current liabilities	54.6	128.6
Other, net	8.4	134.3
Net cash provided by operating activities	735.7	894.0
Investing Activities
Capital expenditures	(358.8)	(439.6)
Acquisition of Upstream, net of cash and restricted cash acquired of $9.2	(268.2)	0.0
Capital contributions to transmission affiliates	(3.4)	(12.8)
Proceeds from the sale of assets	10.6	0.8
Proceeds from the sale of investments held in rabbi trust	0.1	16.5
Other, net	13.1	(0.7)
Net cash used in investing activities	(606.6)	(435.8)
Financing Activities
Exercise of stock options	32.6	2.1
Purchase of common stock	(70.7)	(15.8)
Dividends paid on common stock	(186.2)	(174.2)
Issuance of long-term debt	350.0	0.0
Retirement of long-term debt	(13.3)	(12.6)
Change in short-term debt	(294.9)	(244.3)
Other, net	(3.6)	(0.3)
Net cash used in financing activities	(186.1)	(445.1)
Net change in cash, cash equivalents, and restricted cash	(57.0)	13.1
Cash, cash equivalents, and restricted cash at beginning of period	146.1	58.6
Cash, cash equivalents, and restricted cash at end of period	$ 89.1	$ 71.7