CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net income	$ 568.0	$ 510.3
Reconciliation to cash provided by operating activities
Depreciation and amortization	278.1	261.4
Deferred income taxes and ITCs, net	103.8	129.6
Contributions and payments related to pension and OPEB plans	(3.6)	(4.1)
Equity income in transmission affiliates, net of distributions	(7.7)	(9.2)
Change in –
Accounts receivable and unbilled revenues, net	(174.3)	(150.4)
Materials, supplies, and inventories	267.0	175.1
Prepayments	72.6	4.6
Amounts recoverable from customers	10.3	(286.7)
Other current assets	1.1	15.6
Accounts payable	(293.8)	(181.5)
Other current liabilities	289.5	(2.3)
Other, net	(34.2)	(67.2)
Net cash provided by operating activities	1,076.8	395.2
Investing activities
Capital expenditures	(383.5)	(470.6)
Acquisition of Jayhawk	0.0	(119.4)
Capital contributions to transmission affiliates	(21.1)	0.0
Proceeds from the sale of assets	9.7	11.3
Proceeds from the sale of investments held in rabbi trust	15.4	12.7
Insurance proceeds received for property damage	41.0	0.0
Other, net	0.3	24.7
Net cash used in investing activities	(338.2)	(541.3)
Financing activities
Exercise of stock options	11.8	1.2
Purchase of common stock	(23.4)	(6.6)
Dividends paid on common stock	(229.6)	(213.7)
Issuance of long-term debt	0.0	600.0
Retirement of long-term debt	(15.4)	(14.7)
Issuance of short-term loan	0.9	0.0
Repayment of short-term loan	0.0	(340.0)
Change in other short-term debt	(447.9)	143.5
Other, net	(2.9)	(6.6)
Net cash provided by (used in) financing activities	(706.5)	163.1
Net change in cash, cash equivalents, and restricted cash	32.1	17.0
Cash, cash equivalents, and restricted cash at beginning of period	87.5	72.6
Cash, cash equivalents, and restricted cash at end of period	$ 119.6	$ 89.6