CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating activities
Net income	$ 622.6	$ 507.6
Reconciliation to cash provided by operating activities
Depreciation and amortization	333.4	305.5
Deferred income taxes and ITCs, net	184.3	56.5
Contributions and payments related to pension and OPEB plans	(4.0)	(5.5)
Equity income in transmission affiliates, net of distributions	(9.1)	(6.4)
Change in –
Accounts receivable and unbilled revenues, net	(61.3)	60.7
Materials, supplies, and inventories	166.6	293.6
Collateral on deposit	17.2	(91.8)
Other current assets	19.7	89.4
Accounts payable	(229.8)	(424.7)
Other current liabilities	(44.8)	63.7
Other, net	(131.2)	(52.5)
Net cash provided by operating activities	863.6	796.1
Investing activities
Capital expenditures	(444.5)	(499.4)
Acquisition of Whitewater	0.0	(76.0)
Acquisition of Sapphire Sky, net of cash acquired of $0.3	0.0	(442.6)
Acquisition of Samson I, net of cash acquired of $5.2	0.0	(249.4)
Capital contributions to transmission affiliates	(12.1)	(6.1)
Proceeds from the sale of investments held in rabbi trust	14.8	10.4
Other, net	5.6	(4.8)
Net cash used in investing activities	(436.2)	(1,267.9)
Financing activities
Exercise of stock options	3.7	0.9
Issuance of common stock	19.2	0.0
Purchase of common stock	(2.0)	(6.9)
Dividends paid on common stock	(263.5)	(246.1)
Issuance of long-term debt	0.0	1,100.0
Retirement of long-term debt	(756.9)	(35.2)
Change in commercial paper	552.8	(385.4)
Purchase of additional ownership interest in Samson I from noncontrolling interest	(28.1)	0.0
Other, net	(1.7)	(9.7)
Net cash provided by (used in) financing activities	(476.5)	417.6
Net change in cash, cash equivalents, and restricted cash	(49.1)	(54.2)
Cash, cash equivalents, and restricted cash at beginning of period	165.2	182.2
Cash, cash equivalents, and restricted cash at end of period	$ 116.1	$ 128.0