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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Activities      
Net Income (Loss) $ 791.8 $ 588.8 $ (14.2)
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:      
Loss on early extinguishment of debt 0.0 0.0 243.5
Depreciation and amortization 820.8 748.4 725.9
Deferred income taxes and investment tax credits 156.9 111.9 (29.0)
Stock compensation expense and 401(k) profit sharing contribution 24.9 24.3 17.4
Loss (gain) on sale of assets (105.3) 5.6 409.8
Other adjustments 5.7 (0.7) (0.3)
Changes in Assets and Liabilities:      
Accounts receivable (216.3) (40.3) (3.9)
Inventories (258.9) (112.9) (1.5)
Accounts payable 165.0 54.9 (29.7)
Exchange gas receivable/payable 57.8 (114.2) (6.9)
Other accruals 73.4 43.0 (175.1)
Prepayments and other current assets (9.8) (36.6) (5.9)
Regulatory assets/liabilities (129.4) 76.8 70.8
Postretirement and postemployment benefits 84.7 (96.4) (103.6)
Deferred charges and other noncurrent assets (4.1) (4.7) (15.0)
Other noncurrent liabilities and deferred credits (47.8) (30.0) 21.7
Net Cash Flows from Operating Activities 1,409.4 1,217.9 1,104.0
Investing Activities      
Capital expenditures (2,203.1) (1,838.0) (1,758.1)
Proceeds from Insurance Settlement, Investing Activities 105.0 0.0 0.0
Cost of removal (151.7) (121.1) (138.2)
Proceeds from disposition of assets 0.0 0.7 1,115.9
Purchases of available-for-sale securities (73.5) (102.9) (144.7)
Sales of available-for-sale securities 75.7 97.8 131.4
Payment to renewable generation asset developer (323.9) (240.4) (85.3)
Other investing activities 1.3 (1.0) (0.1)
Net Cash Flows used for Investing Activities (2,570.2) (2,204.9) (879.1)
Financing Activities      
Proceeds from issuance of long-term debt 345.6 0.0 2,974.0
Repayments of long-term debt and finance lease obligations (60.3) (25.7) (1,622.0)
Issuance of short-term debt (maturity > 90 days) 1,000.0 0.0 1,350.0
Repayment of short-term debt (maturity > 90 days) 0.0 0.0 (2,200.0)
Change in short-term debt (maturity ≤ 90 days) 202.2 57.0 (420.1)
Issuance of common stock, net of issuance costs 154.3 299.6 211.4
Equity costs, premiums and other debt related costs (13.0) (18.2) (246.5)
Contributions from noncontrolling interest 21.2 245.1 82.2
Distributions to noncontrolling interest (6.0) (0.6) 0.0
Issuance of equity units, net of underwriting costs 0.0 839.9 0.0
Dividends paid - common stock (381.5) (345.2) (321.6)
Dividends paid - preferred stock (55.1) (55.1) (55.1)
Contract liability payment (66.1) (40.5) 0.0
Net Cash Flows from (used for) Financing Activities 1,141.3 956.3 (247.7)
Change in cash, cash equivalents and restricted cash (19.5) (30.7) (22.8)
Cash, cash equivalents and restricted cash at beginning of period 94.9 125.6 148.4
Cash, Cash Equivalents and Restricted Cash at End of Period $ 75.4 $ 94.9 $ 125.6