CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net income	$ 797.6	$ 855.8
Reconciliation to cash provided by operating activities
Depreciation and amortization	619.4	557.7
Deferred income taxes and ITCs, net	113.4	163.2
Contributions and payments related to pension and OPEB plans	(9.2)	(8.6)
Equity income in transmission affiliates, net of distributions	(13.4)	(17.5)
Change in –
Accounts receivable and unbilled revenues, net	529.5	36.3
Materials, supplies, and inventories	213.3	63.6
Collateral on deposit	(28.9)	0.1
Amounts recoverable from customers	33.7	(31.9)
Other current assets	16.2	23.4
Accounts payable	(388.4)	1.5
Temporary LIFO liquidation credit	2.1	107.6
Collateral received	0.0	85.0
Other current liabilities	(41.9)	43.4
Other, net	(89.1)	(117.0)
Net cash provided by operating activities	1,754.3	1,762.6
Investing activities
Capital expenditures	(1,073.7)	(1,028.8)
Acquisition of Whitewater	(76.0)	0.0
Acquisition of Sapphire Sky, net of cash acquired of $0.3	(442.6)	0.0
Acquisition of Samson I, net of cash acquired of $5.2	(249.4)	0.0
Acquisition of Red Barn	(143.8)	0.0
Acquisition of West Riverside	(95.3)	0.0
Capital contributions to transmission affiliates	(33.3)	(30.3)
Proceeds from the sale of assets	30.4	65.0
Proceeds from the sale of investments held in rabbi trust	10.4	15.4
Payments for ATC's construction costs that will be reimbursed	(19.1)	(11.2)
Insurance proceeds received for property damage	0.0	41.3
Other, net	(9.0)	11.1
Net cash used in investing activities	(2,101.4)	(937.5)
Financing activities
Exercise of stock options	2.3	23.0
Purchase of common stock	(9.5)	(48.4)
Dividends paid on common stock	(492.1)	(459.0)
Issuance of long-term debt	1,450.0	0.0
Retirement of long-term debt	(76.8)	(49.1)
Change in commercial paper	(556.6)	(269.3)
Payments for debt issuance costs	(9.6)	(0.8)
Other, net	(2.7)	(4.1)
Net cash provided by (used in) financing activities	305.0	(807.7)
Net change in cash, cash equivalents, and restricted cash	(42.1)	17.4
Cash, cash equivalents, and restricted cash at beginning of period	182.2	87.5
Cash, cash equivalents, and restricted cash at end of period	$ 140.1	$ 104.9