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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating activities      
Net income $ 1,331.7 $ 1,409.7 $ 1,298.5
Reconciliation to cash provided by operating activities      
Depreciation and amortization 1,264.2 1,122.6 1,074.3
Deferred income taxes and ITCs, net 219.4 280.1 151.1
Impairment related to ICC disallowances 178.9 0.0 0.0
Contributions and payments related to pension and OPEB plans (16.7) (15.1) (66.3)
Equity income in transmission affiliates, net of distributions (33.0) (74.3) (25.1)
Net change in transmission regulatory assets and liabilities 19.8 (85.8) 5.7
Net gain on disposition of assets (23.8) (66.2) (6.2)
Change in -      
Accounts receivable and unbilled revenues, net 340.6 (342.1) (249.2)
Materials, supplies, and inventories 41.9 (171.3) (107.2)
Amounts recoverable from customers 17.4 60.0 (82.3)
Collateral on deposit 22.1 (108.1) 4.6
Other current assets 18.9 (27.7) 17.6
Accounts payable (254.0) 121.5 126.9
Other current liabilities 47.5 126.9 (17.2)
Other, net (156.5) (169.5) (92.5)
Net cash provided by operating activities 3,018.4 2,060.7 2,032.7 Close
Investing Activities      
Capital expenditures (2,492.9) (2,314.9) (2,252.8)
Acquisition of Whitewater (76.0) 0.0 0.0
Acquisition of Sapphire Sky, net of cash acquired of $0.3 (442.6) 0.0 0.0
Acquisition of Samson I, net of cash acquired of $5.2 (257.3) 0.0 0.0
Acquisition of Red Barn (143.8) 0.0 0.0
Acquisition of West Riverside (95.3) 0.0 0.0
Acquisition of Thunderhead, net of cash acquired of $0.5 0.0 (382.0) 0.0
Acquisition of Jayhawk 0.0 0.0 (119.9)
Capital contributions to transmission affiliates (63.7) (45.5) 0.0
Proceeds from the sale of assets 32.8 69.0 21.9
Proceeds from the sale of investments held in rabbi trust 10.4 15.4 18.7
Payments for ATC's construction costs that will be reimbursed (19.8) (24.8) (7.0)
Reimbursement for ATC's construction costs 0.1 10.2 0.0
Insurance proceeds received for property damage 2.5 41.6 0.0
Other, net (12.6) (11.4) 27.3
Net cash used in investing activities (3,558.2) (2,642.4) (2,311.8) Close
Financing Activities      
Exercise of stock options 6.3 33.6 15.7
Purchase of common stock (16.6) (69.2) (33.1)
Dividends paid on common stock (984.2) (917.9) (854.8)
Issuance of long-term debt 2,170.0 1,999.3 2,383.8
Retirement of long-term debt (1,005.4) (92.1) (1,260.4)
Repayment of short-term loan (0.8) 0.0 (340.0)
Change in commercial paper 373.7 (252.6) 459.2
Payments for debt extinguishment and issuance costs (14.2) (15.6) (67.2)
Other, net (6.0) (9.1) (9.2)
Net cash provided by financing activities 522.8 676.4 294.0 Close
Net change in cash, cash equivalents, and restricted cash (17.0) 94.7 14.9 Close
Cash, cash equivalents, and restricted cash at beginning of year 182.2 87.5 72.6
Cash, cash equivalents, and restricted cash at end of year $ 165.2 $ 182.2 $ 87.5