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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Activities      
Net Income (Loss) $ 588.8 $ (14.2) $ 383.1
Adjustments to Reconcile Net Income (Loss) to Net Cash from Operating Activities:      
Loss on early extinguishment of debt 0.0 243.5 0.0
Depreciation and amortization 748.4 725.9 717.4
Deferred income taxes and investment tax credits 111.9 (29.0) 118.2
Stock compensation expense and 401(k) profit sharing contribution 24.3 17.4 25.9
Impairment of goodwill and intangible assets 0.0 0.0 414.5
Loss (gain) on sale of assets 5.6 409.8 (0.6)
Other adjustments (0.7) (0.3) (0.1)
Changes in Assets and Liabilities:      
Accounts receivable (40.3) (3.9) 187.8
Inventories (112.9) (1.5) (2.0)
Accounts payable 54.9 (29.7) (299.9)
Exchange gas receivable/payable (114.2) (6.9) 55.5
Other accruals 43.0 (175.1) 138.3
Prepayments and other current assets (36.6) (5.9) (33.6)
Regulatory assets/liabilities 76.8 70.8 (85.6)
Postretirement and postemployment benefits (96.4) (103.6) (21.1)
Deferred charges and other noncurrent assets (4.7) (15.0) (76.1)
Other noncurrent liabilities (30.0) 21.7 61.6
Net Cash Flows from Operating Activities 1,217.9 1,104.0 1,583.3
Investing Activities      
Capital expenditures (1,838.0) (1,758.1) (1,802.4)
Cost of removal (121.1) (138.2) (113.2)
Proceeds from disposition of assets 0.7 1,115.9 0.4
Purchases of available-for-sale securities (102.9) (144.7) (140.4)
Sales of available-for-sale securities 97.8 131.4 132.1
Payment to renewable generation asset developer (240.4) (85.3) 0.0
Other investing activities (1.0) (0.1) 1.1
Net Cash Flows used for Investing Activities (2,204.9) (879.1) (1,922.4)
Financing Activities      
Proceeds from issuance of long-term debt 0.0 2,974.0 750.0
Repayments of long-term debt and finance lease obligations (25.7) (1,622.0) (51.6)
Issuance of short-term debt (maturity > 90 days) 0.0 1,350.0 600.0
Repayment of short-term debt (maturity > 90 days) 0.0 (2,200.0) (700.0)
Change in short-term borrowings, net (maturity ≤ 90 days) 57.0 (420.1) (104.0)
Issuance of common stock, net of issuance costs 299.6 211.4 244.4
Equity costs, premiums and other debt related costs (18.2) (246.5) (17.8)
Contributions from noncontrolling interest 245.1 82.2 0.0
Distributions to noncontrolling interest (0.6) 0.0 0.0
Issuance of equity units, net of underwriting costs 839.9 0.0 0.0
Dividends paid - common stock (345.2) (321.6) (298.5)
Dividends paid - preferred stock (55.1) (55.1) (56.1)
Contract liability payment (40.5) 0.0 0.0
Net Cash Flows from Financing Activities 956.3 (247.7) 366.4
Change in cash, cash equivalents and restricted cash (30.7) (22.8) 27.3
Cash, cash equivalents and restricted cash at beginning of period 125.6 148.4 121.1
Cash, Cash Equivalents and Restricted Cash at End of Period $ 94.9 $ 125.6 $ 148.4