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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Activities      
Net Income $ 674.4 $ 791.8 $ 588.8
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:      
Depreciation and amortization 908.2 820.8 748.4
Deferred income taxes and investment tax credits 134.1 156.9 111.9
Stock compensation expense and 401(k) profit sharing contribution 33.5 24.9 24.3
Loss (gain) on sale of assets 2.9 (105.3) 5.6
Other adjustments (17.9) 5.7 (0.7)
Changes in Assets and Liabilities:      
Accounts receivable 184.1 (216.3) (40.3)
Gas storage and other inventories 233.9 (258.9) (112.9)
Accounts payable (171.8) 165.0 54.9
Exchange gas receivable/payable 126.5 57.8 (114.2)
Other accruals (102.9) 73.4 43.0
Prepayments and other current assets 36.7 (9.8) (36.6)
Regulatory assets/liabilities (26.2) (129.4) 76.8
Postretirement and postemployment benefits (22.0) 84.7 (96.4)
Deferred charges and other noncurrent assets (10.1) (4.1) (4.7)
Other noncurrent liabilities and deferred credits (48.3) (47.8) (30.0)
Net Cash Flows from Operating Activities 1,935.1 1,409.4 1,217.9
Investing Activities      
Capital expenditures (2,645.8) (2,203.1) (1,838.0)
Proceeds from Insurance Settlement, Investing Activities 3.0 105.0 0.0
Cost of removal (160.8) (151.7) (121.1)
Purchases of available-for-sale securities (42.8) (73.5) (102.9)
Sales of available-for-sale securities 39.9 75.7 97.8
Milestone and final payments to renewable generation asset developer (761.4) (323.9) (240.4)
Other investing activities (3.7) 1.3 (1.0)
Net Cash Flows used for Investing Activities (3,571.6) (2,570.2) (2,204.9)
Financing Activities      
Proceeds from issuance of long-term debt 1,488.7 345.6 0.0
Repayments of long-term debt and finance lease obligations (33.1) (60.3) (25.7)
Issuance of short term credit agreements   1,000.0 0.0
Repayment of short-term debt (maturity > 90 days) 650.0    
Net change in commercial paper and other short-term borrowings 636.4 202.2 57.0
Issuance of common stock, net of issuance costs 12.9 154.3 299.6
Equity costs, premiums and other debt related costs (30.2) (13.0) (18.2)
Contributions from noncontrolling interests 2,402.8 21.2 245.1
Distributions to noncontrolling interest (14.1) (6.0) (0.6)
Issuance of equity units, net of underwriting costs 0.0 0.0 839.9
Dividends paid - common stock (413.5) (381.5) (345.2)
Preferred Stock Redemption Premium (9.8) 0.0 0.0
Dividends paid - preferred stock (43.8) (55.1) (55.1)
Contract liability payment (66.6) (66.1) (40.5)
Net Cash Flows from Financing Activities 3,842.2 1,141.3 956.3
Change in cash, cash equivalents and restricted cash 2,205.7 (19.5) (30.7)
Cash, cash equivalents and restricted cash at beginning of period 75.4 94.9 125.6
Cash, Cash Equivalents and Restricted Cash at End of Period 2,281.1 75.4 94.9
Repayments of Other Debt (347.2) 0.0 0.0
Proceeds from Issuance of Preferred Stock and Preference Stock (393.9) $ 0.0 $ 0.0
Preferred Stock      
Financing Activities      
Preferred Stock Redemption Premium $ (6.2)