CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income (loss)	$ 510.3	$ 452.6
Reconciliation to cash provided by operating activities
Depreciation and amortization	261.4	239.1
Deferred income taxes and ITCs, net	129.6	92.1
Contributions and payments related to pension and OPEB plans	(4.1)	(3.7)
Equity income in transmission affiliates, net of distributions	(9.2)	0.8
Change in –
Accounts receivable and unbilled revenues, net	(150.4)	(3.5)
Materials, supplies, and inventories	175.1	158.7
Amounts recoverable from customers	(286.7)	8.1
Other current assets	20.2	57.3
Accounts payable	(181.5)	(250.1)
Other current liabilities	(2.3)	(27.7)
Other, net	(67.2)	(33.2)
Net cash provided by operating activities	395.2	690.5
Investing activities
Capital expenditures	(470.6)	(496.1)
Acquisition of Jayhawk	(119.4)	0.0
Capital contributions to transmission affiliates	0.0	(3.0)
Proceeds from the sale of assets	11.3	1.3
Proceeds from the sale of investments held in rabbi trust	12.7	17.0
Other, net	24.7	17.8
Net cash used in investing activities	(541.3)	(463.0)
Financing activities
Exercise of stock options	1.2	16.0
Purchase of common stock	(6.6)	(40.4)
Dividends paid on common stock	(213.7)	(199.5)
Issuance of long-term debt	600.0	0.0
Retirement of long-term debt	(14.7)	(14.0)
Issuance of short-term loan	0.0	340.0
Repayment of short-term loan	(340.0)	0.0
Change in other short-term debt	143.5	(343.6)
Other, net	(6.6)	(2.6)
Net cash provided by (used in) financing activities	163.1	(244.1)
Net change in cash, cash equivalents, and restricted cash	17.0	(16.6)
Cash, cash equivalents, and restricted cash at beginning of period	72.6	82.3
Cash, cash equivalents, and restricted cash at end of period	$ 89.6	$ 65.7