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Condensed Parent Company Financial Statements (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net cash flows from operating activities | $ 486.0 | $ 582.0 | $ 501.0
Cash flows from (used for) investing activities: |  |  |
Dividends from consolidated subsidiaries in excess of equity earnings | (47.0) | (61.0) | (43.0)
Net cash flows from (used for) investing activities | (933.0) | (728.0) | (951.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (428.0) | (403.0) | (377.0)
Proceeds from issuance of common stock, net | 25.0 | 28.0 | 247.0
Net change in commercial paper | 127.0 | 126.0 | 52.0
Other | 2.0 | (13.0) | (27.0)
Net cash flows from (used for) financing activities | 431.0 | 130.0 | 488.0
Net increase (decrease) in cash, cash equivalents and restricted cash | (16.0) | (16.0) | 38.0
Cash, cash equivalents and restricted cash at beginning of period | 40.0 | 56.0 | 18.0
Cash, cash equivalents and restricted cash at end of period | 24.0 | 40.0 | 56.0
Supplemental cash flows information: |  |  |
Interest | (311.0) | (272.0) | (274.0)
Income taxes, net | (6.0) | (3.0) | 5.0
Parent Company [Member] |  |  |
Net cash flows from operating activities | 492.0 | 494.0 | 396.0
Cash flows from (used for) investing activities: |  |  |
Capital contributions to consolidated subsidiaries | (530.0) | (295.0) | (429.0)
Net change in notes receivable from and payable to affiliates | 369.0 | (21.0) | 201.0
Dividends from consolidated subsidiaries in excess of equity earnings | 0.0 | 50.0 | 0.0
Net cash flows from (used for) investing activities | (161.0) | (266.0) | (228.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (428.0) | (403.0) | (377.0)
Proceeds from issuance of common stock, net | 25.0 | 28.0 | 247.0
Net change in commercial paper | 73.0 | 147.0 | (37.0)
Other | (1.0) | 0.0 | (1.0)
Net cash flows from (used for) financing activities | (331.0) | (228.0) | (168.0)
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 | (6.0) | (1.0) | (2.0)
Income taxes, net | $ 15.0 | $ 4.0 | $ 10.0

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