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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Activities      
Net Income (Loss) $ (14.2) $ 383.1 $ (50.6)
Adjustments to Reconcile Net Income (Loss) to Net Cash from Operating Activities:      
Loss on early extinguishment of debt 243.5 0.0 45.5
Depreciation and amortization 725.9 717.4 599.6
Deferred income taxes and investment tax credits (29.0) 118.2 (188.2)
Stock compensation expense and 401(k) profit sharing contribution 17.4 25.9 28.6
Impairment of goodwill and intangible assets 0.0 414.5 0.0
Loss (gain) on sale of assets 409.8 (0.6) 1.3
Amortization of discount/premium on debt 9.4 8.2 7.5
AFUDC equity (9.9) (8.0) (14.2)
Other adjustments 0.2 (0.3) 0.4
Changes in Assets and Liabilities:      
Accounts receivable (3.9) 187.8 (186.2)
Inventories (1.5) (2.0) 41.4
Accounts payable (29.7) (299.9) 268.4
Customer deposits and credits 10.0 16.9 (25.4)
Taxes accrued 28.4 7.3 20.2
Interest accrued 5.3 8.8 (21.7)
Exchange gas receivable/payable (6.9) 55.5 (21.5)
Other accruals (218.8) 105.3 43.5
Prepayments and other current assets (5.9) (33.6) (14.5)
Regulatory assets/liabilities 70.8 (85.6) (53.2)
Postretirement and postemployment benefits (103.6) (21.1) 58.2
Deferred charges and other noncurrent assets (15.0) (76.1) 3.8
Other noncurrent liabilities 21.7 61.6 (2.8)
Net Cash Flows from Operating Activities 1,104.0 1,583.3 540.1
Investing Activities      
Capital expenditures (1,758.1) (1,802.4) (1,818.2)
Cost of removal (138.2) (113.2) (104.3)
Proceeds from disposition of assets 1,115.9 0.4 1.8
Purchases of available-for-sale securities (144.7) (140.4) (90.0)
Sales of available-for-sale securities 131.4 132.1 82.3
Payment to renewable generation asset developer (85.3) 0.0 0.0
Other investing activities (0.1) 1.1 2.3
Net Cash Flows used for Investing Activities (879.1) (1,922.4) (1,926.1)
Financing Activities      
Proceeds from issuance of long-term debt 2,974.0 750.0 350.0
Repayments of long-term debt and finance lease obligations (1,622.0) (51.6) (1,046.1)
Issuance of short-term debt (maturity > 90 days) 1,350.0 600.0 950.0
Repayments of short-term debt (maturity 90 days) (2,200.0) (700.0) 0.0
Change in short-term borrowings, net (maturity ≤ 90 days) (420.1) (104.0) (178.5)
Issuance of common stock, net of issuance costs 211.4 244.4 848.2
Issuance of preferred stock, net of issuance costs 0.0 0.0 880.0
Equity costs, premiums and other debt related costs (246.5) (17.8) (46.0)
Acquisition of treasury stock 0.0 0.0 (4.0)
Contributions from non-controlling interest, net of issuance costs 82.2 0.0 0.0
Dividends paid - common stock (321.6) (298.5) (273.3)
Dividends paid - preferred stock (55.1) (56.1) (11.6)
Net Cash Flows from Financing Activities (247.7) 366.4 1,468.7
Change in cash, cash equivalents and restricted cash (22.8) 27.3 82.7
Cash, cash equivalents and restricted cash at beginning of period 148.4 121.1 38.4
Cash, Cash Equivalents and Restricted Cash at End of Period $ 125.6 $ 148.4 $ 121.1