CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net income	$ 1,157.5	$ 1,074.7
Reconciliation to cash provided by operating activities
Depreciation and amortization	838.0	799.2
Deferred income taxes and ITCs, net	187.8	158.0
Contributions and payments related to pension and OPEB plans	(11.6)	(11.3)
Equity income in transmission affiliates, net of distributions	(47.1)	(27.0)
Change in –
Accounts receivable and unbilled revenues, net	150.9	162.4
Materials, supplies, and inventories	(288.8)	(117.1)
Prepaid taxes	57.8	37.7
Other prepayments	31.6	30.0
Amounts recoverable from customers	15.3	(119.4)
Other current assets	(1.5)	13.8
Accounts payable	82.2	(15.1)
Other current liabilities	68.5	107.5
Other, net	(181.1)	(86.7)
Net cash provided by operating activities	2,059.5	2,006.7
Investing activities
Capital expenditures	(1,700.7)	(1,627.9)
Acquisition of Thunderhead, net of cash acquired of $0.5	(362.9)	0.0
Acquisition of Jayhawk	0.0	(119.8)
Capital contributions to transmission affiliates	(39.4)	0.0
Proceeds from the sale of assets	69.0	21.6
Proceeds from the sale of investments held in rabbi trust	15.4	12.7
Insurance proceeds received for property damage	41.6	0.0
Payments for ATC's construction costs that will be reimbursed	(20.6)	(2.2)
Other, net	11.7	26.9
Net cash used in investing activities	(1,985.9)	(1,688.7)
Financing activities
Exercise of stock options	33.1	6.5
Purchase of common stock	(68.3)	(15.7)
Dividends paid on common stock	(688.5)	(641.2)
Issuance of long-term debt	1,400.0	1,018.8
Retirement of long-term debt	(64.9)	(356.2)
Repayment of short-term loan	0.0	(340.0)
Change in commercial paper	(640.2)	71.5
Other, net	(16.3)	(25.1)
Net cash used in financing activities	(45.1)	(281.4)
Net change in cash, cash equivalents, and restricted cash	28.5	36.6
Cash, cash equivalents, and restricted cash at beginning of period	87.5	72.6
Cash, cash equivalents, and restricted cash at end of period	$ 116.0	$ 109.2