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Condensed Parent Company Financial Statements (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net cash flows from operating activities | $ 1,167.0 | $ 867.0 | $ 486.0
Cash flows from (used for) investing activities: |  |  |
Net cash flows from (used for) investing activities | (1,547.0) | (1,401.0) | (933.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (492.0) | (456.0) | (428.0)
Proceeds from issuance of common stock, net | 23.0 | 246.0 | 25.0
Proceeds from issuance of long-term debt | 1,613.0 | 1,455.0 | 1,338.0
Net change in commercial paper | 83.0 | (167.0) | 127.0
Other | (20.0) | 3.0 | 2.0
Net cash flows from (used for) financing activities | 398.0 | 573.0 | 431.0
Net increase (decrease) in cash, cash equivalents and restricted cash | 18.0 | 39.0 | (16.0)
Cash, cash equivalents and restricted cash at beginning of period | 63.0 | 24.0 | 40.0
Cash, cash equivalents and restricted cash at end of period | 81.0 | 63.0 | 24.0
Supplemental cash flows information: |  |  |
Interest | (434.0) | (378.0) | (311.0)
Income taxes, net | 197.0 | 88.0 | (6.0)
Parent Company [Member] |  |  |
Net cash flows from operating activities | 355.0 | 445.0 | 492.0
Cash flows from (used for) investing activities: |  |  |
Capital contributions to consolidated subsidiaries | (380.0) | (325.0) | (530.0)
Net change in notes receivable from and payable to affiliates | 326.0 | (281.0) | 369.0
Net cash flows from (used for) investing activities | (54.0) | (606.0) | (161.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (492.0) | (456.0) | (428.0)
Proceeds from issuance of common stock, net | 23.0 | 246.0 | 25.0
Proceeds from issuance of long-term debt | 0.0 | 565.0 | 0.0
Net change in commercial paper | 168.0 | (195.0) | 73.0
Other | 0.0 | 1.0 | (1.0)
Net cash flows from (used for) financing activities | (301.0) | 161.0 | (331.0)
Net increase (decrease) in cash, cash equivalents and restricted cash | 0.0 | 0.0 | 0.0
Cash, cash equivalents and restricted cash at beginning of period | 0.0 | 0.0 | 0.0
Cash, cash equivalents and restricted cash at end of period | 0.0 | 0.0 | 0.0
Supplemental cash flows information: |  |  |
Interest | (40.0) | (27.0) | (6.0)
Income taxes, net | $ 8.0 | $ 22.0 | $ 15.0

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