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Condensed Parent Company Financial Statements (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net cash flows from operating activities | $ 867.0 | $ 486.0 | $ 582.0
Cash flows from (used for) investing activities: |  |  |
Dividends from consolidated subsidiaries in excess of equity earnings | (120.0) | (47.0) | (61.0)
Net cash flows from (used for) investing activities | (1,401.0) | (933.0) | (728.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (456.0) | (428.0) | (403.0)
Proceeds from issuance of common stock, net | 246.0 | 25.0 | 28.0
Proceeds from issuance of long-term debt | 1,455.0 | 1,338.0 | 600.0
Net change in commercial paper | (167.0) | 127.0 | 126.0
Other | 3.0 | 2.0 | (13.0)
Net cash flows from (used for) financing activities | 573.0 | 431.0 | 130.0
Net increase (decrease) in cash, cash equivalents and restricted cash | 39.0 | (16.0) | (16.0)
Cash, cash equivalents and restricted cash at beginning of period | 24.0 | 40.0 | 56.0
Cash, cash equivalents and restricted cash at end of period | 63.0 | 24.0 | 40.0
Supplemental cash flows information: |  |  |
Interest | (378.0) | (311.0) | (272.0)
Income taxes, net | 88.0 | (6.0) | (3.0)
Parent Company [Member] |  |  |
Net cash flows from operating activities | 445.0 | 492.0 | 494.0
Cash flows from (used for) investing activities: |  |  |
Capital contributions to consolidated subsidiaries | (325.0) | (530.0) | (295.0)
Net change in notes receivable from and payable to affiliates | (281.0) | 369.0 | (21.0)
Dividends from consolidated subsidiaries in excess of equity earnings | 0.0 | 0.0 | 50.0
Net cash flows from (used for) investing activities | (606.0) | (161.0) | (266.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (456.0) | (428.0) | (403.0)
Proceeds from issuance of common stock, net | 246.0 | 25.0 | 28.0
Proceeds from issuance of long-term debt | 565.0 | 0.0 | 0.0
Net change in commercial paper | (195.0) | 73.0 | 147.0
Other | 1.0 | (1.0) | 0.0
Net cash flows from (used for) financing activities | 161.0 | (331.0) | (228.0)
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 | (27.0) | (6.0) | (1.0)
Income taxes, net | $ 22.0 | $ 15.0 | $ 4.0

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