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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating activities    
Net income $ 725.5 $ 622.6
Reconciliation to cash provided by operating activities    
Depreciation and amortization 359.9 333.4
Deferred income taxes and ITCs, net 55.6 184.3
Contributions and payments related to pension and OPEB plans (3.9) (4.0)
Equity income in transmission affiliates, net of distributions 2.2 (9.1)
Change in –    
Accounts receivable and unbilled revenues, net (180.3) (61.3)
Materials, supplies, and inventories 237.2 166.6
Other current assets 13.0 36.9
Accounts payable (195.4) (229.8)
Temporary LIFO liquidation credit 68.6 0.0
Accrued interest 83.5 33.4
Other current liabilities 5.6 (78.2)
Other, net (8.9) (131.2)
Net cash provided by operating activities 1,162.6 863.6
Investing activities    
Capital expenditures (701.1) (444.5)
Acquisition of Hardin III, net of cash acquired of $0.2 (406.1) 0.0
Capital contributions to transmission affiliates (42.3) (12.1)
Proceeds from the sale of investments held in rabbi trust 16.9 14.8
Reimbursement for ATC's transmission infrastructure upgrades 39.7 6.2
Other, net (8.9) (0.6)
Net cash used in investing activities (1,101.8) (436.2)
Financing activities    
Exercise of stock options 21.2 3.7
Issuance of common stock, net 117.1 19.2
Purchase of common stock (1.3) (2.0)
Dividends paid on common stock (283.6) (263.5)
Retirement of long-term debt (17.9) (756.9)
Change in commercial paper 209.5 552.8
Purchase of additional ownership interest in Samson I from noncontrolling interest 0.0 (28.1)
Other, net (4.6) (1.7)
Net cash provided by (used in) financing activities 40.4 (476.5)
Net change in cash, cash equivalents, and restricted cash 101.2 (49.1)
Cash, cash equivalents, and restricted cash at beginning of period 42.2 165.2
Cash, cash equivalents, and restricted cash at end of period $ 143.4 $ 116.1