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Condensed Parent Company Financial Statements (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net cash flows from operating activities | $ 582.0 | $ 501.0 | $ 660.0
Cash flows from (used for) investing activities: |  |  |
Dividends from consolidated subsidiaries in excess of equity earnings | (61.0) | (43.0) | (60.0)
Net cash flows from (used for) investing activities | (728.0) | (951.0) | (1,287.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (403.0) | (377.0) | (337.0)
Proceeds from issuance of common stock, net | 28.0 | 247.0 | 390.0
Net change in commercial paper | 126.0 | 52.0 | (104.0)
Other | (13.0) | (27.0) | (24.0)
Net cash flows from (used for) financing activities | 130.0 | 488.0 | 619.0
Net increase (decrease) in cash, cash equivalents and restricted cash | (16.0) | 38.0 | (8.0)
Cash, cash equivalents and restricted cash at beginning of period | 56.0 | 18.0 | 26.0
Cash, cash equivalents and restricted cash at end of period | 40.0 | 56.0 | 18.0
Supplemental cash flows information: |  |  |
Interest | (272.0) | (274.0) | (268.0)
Income taxes, net | (3.0) | 5.0 | 21.0
Parent Company [Member] |  |  |
Net cash flows from operating activities | 494.0 | 396.0 | 305.0
Cash flows from (used for) investing activities: |  |  |
Capital contributions to consolidated subsidiaries | (295.0) | (429.0) | (250.0)
Net change in notes receivable from and payable to affiliates | (21.0) | 201.0 | 8.0
Dividends from consolidated subsidiaries in excess of equity earnings | 50.0 | 0.0 | 0.0
Net cash flows from (used for) investing activities | (266.0) | (228.0) | (242.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (403.0) | (377.0) | (338.0)
Proceeds from issuance of common stock, net | 28.0 | 247.0 | 390.0
Net change in commercial paper | 147.0 | (37.0) | (116.0)
Other | 0.0 | (1.0) | 1.0
Net cash flows from (used for) financing activities | (228.0) | (168.0) | (63.0)
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 | (1.0) | (2.0) | (9.0)
Income taxes, net | $ 4.0 | $ 10.0 | $ 14.0

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