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Statements Of Consolidated Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Activities    
Net Income $ 296.5 $ 75.6
Adjustments to Reconcile Net Income to Net Cash from Operating Activities:    
Depreciation and amortization 185.0 184.3
Deferred income taxes and investment tax credits 55.2 (19.9)
Loss on sale of assets 8.1 280.2
Other adjustments 3.5 7.9
Changes in Assets and Liabilities:    
Components of working capital (89.3) (147.1)
Regulatory assets/liabilities 8.4 12.9
Deferred charges and other noncurrent assets (10.7) (12.1)
Other noncurrent liabilities (8.4) (11.9)
Net Cash Flows from Operating Activities 448.3 369.9
Investing Activities    
Capital expenditures (367.0) (452.1)
Cost of removal (26.9) (34.5)
Purchases of available-for-sale securities (16.6) (43.5)
Sales of available-for-sale securities 16.9 45.4
Payment to renewable generation asset developer (7.4) 0.0
Other investing activities (0.8) 0.1
Net Cash Flows used for Investing Activities (401.8) (484.6)
Financing Activities    
Repayments of long-term debt and finance lease obligations (5.9) (4.1)
Issuance of short-term debt (maturity greater than 90 days) 0.0 500.0
Change in short-term borrowings, net (maturity ≤ 90 days) 17.0 (226.8)
Issuance of common stock, net of issuance costs 2.8 3.7
Equity costs, premiums and other debt related costs (2.5) (5.1)
Contributions from non-controlling interest, net of issuance costs 7.5 0.0
Dividends paid - common stock (86.2) (80.3)
Dividends paid - preferred stock (8.1) (8.1)
Net Cash Flows (used for) from Financing Activities (75.4) 179.3
Change in cash, cash equivalents and restricted cash (28.9) 64.6
Cash, cash equivalents and restricted cash at beginning of period 125.6 148.4
Cash, Cash Equivalents and Restricted Cash at End of Period $ 96.7 $ 213.0