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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities    
Net income $ 1,238.7 $ 1,071.2
Reconciliation to cash provided by operating activities    
Depreciation and amortization 1,102.2 1,010.5
Deferred income taxes and ITCs, net 296.2 368.3
Contributions and payments related to pension and OPEB plans (10.3) (11.0)
Equity income in transmission affiliates, net of distributions (17.5) (29.3)
Change in –    
Accounts receivable and unbilled revenues, net 368.0 324.0
Materials, supplies, and inventories (29.4) (14.7)
Prepaid taxes 89.4 49.4
Collateral on deposit (27.0) 47.7
Other current assets 33.1 (1.8)
Accounts payable (145.3) (151.7)
Accrued interest 88.8 48.0
Other current liabilities 7.1 (75.2)
Other, net (39.2) (5.4)
Net cash provided by operating activities 2,954.8 2,630.0
Investing activities    
Capital expenditures (3,095.1) (1,934.7)
Acquisition of Hardin III, net of cash acquired of $0.2 (406.1) 0.0
Acquisition of West Riverside 0.0 (97.9)
Capital contributions to transmission affiliates (142.4) (45.5)
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 16.5 3.9
Net cash used in investing activities (3,570.5) (2,053.2)
Financing activities    
Exercise of stock options 37.6 13.4
Issuance of common stock, net 746.6 51.0
Purchase of common stock (1.3) (3.2)
Dividends paid on common stock (857.4) (791.2)
Issuance of long-term debt 1,944.6 2,672.4
Retirement of long-term debt (1,285.9) (837.5)
Change in commercial paper 141.7 (1,424.8)
Purchase of additional ownership interest in Samson I from noncontrolling interest 0.0 (28.1)
Payments for debt extinguishment and issuance costs (28.9) (30.7)
Other, net (5.8) (2.3)
Net cash provided by (used in) financing activities 691.2 (381.0)
Net change in cash, cash equivalents, and restricted cash 75.5 195.8
Cash, cash equivalents, and restricted cash at beginning of period 42.2 165.2
Cash, cash equivalents, and restricted cash at end of period $ 117.7 $ 361.0