CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net income	$ 1,074.7	$ 961.8
Reconciliation to cash provided by operating activities
Depreciation and amortization	799.2	726.6
Deferred income taxes and ITCs, net	158.0	152.5
Contributions and payments related to pension and OPEB plans	(11.3)	(10.1)
Equity income in transmission affiliates, net of distributions	(27.0)	(20.3)
Change in –
Accounts receivable and unbilled revenues, net	162.4	262.3
Materials, supplies, and inventories	(117.1)	(23.6)
Prepayments	67.7	92.3
Amounts recoverable from customers	(119.4)	(1.3)
Other current assets	13.8	38.5
Accounts payable	(15.1)	(178.9)
Other current liabilities	107.5	(23.3)
Other, net	(86.7)	(26.8)
Net cash provided by operating activities	2,006.7	1,949.7
Investing activities
Capital expenditures	(1,627.9)	(1,618.7)
Acquisition of Jayhawk	(119.8)	0.0
Capital contributions to transmission affiliates	0.0	(15.2)
Proceeds from the sale of assets	21.6	9.8
Proceeds from the sale of investments held in rabbi trust	12.7	17.1
Insurance proceeds received	0.0	22.2
Other, net	24.7	21.7
Net cash used in investing activities	(1,688.7)	(1,563.1)
Financing activities
Exercise of stock options	6.5	23.3
Purchase of common stock	(15.7)	(56.7)
Dividends paid on common stock	(641.2)	(598.5)
Issuance of long-term debt	1,018.8	810.0
Retirement of long-term debt	(356.2)	(482.6)
Issuance of short-term loan	0.5	340.0
Repayment of short-term loan	(340.0)	0.0
Change in other short-term debt	71.5	(399.8)
Purchase of additional ownership interest in Upstream from noncontrolling interest	0.0	(31.0)
Other, net	(25.6)	(12.4)
Net cash used in financing activities	(281.4)	(407.7)
Net change in cash, cash equivalents, and restricted cash	36.6	(21.1)
Cash, cash equivalents, and restricted cash at beginning of period	72.6	82.3
Cash, cash equivalents, and restricted cash at end of period	$ 109.2	$ 61.2