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Condensed Parent Company Financial Statements (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net cash flows from operating activities | $ 660.4 | $ 527.7 | $ 521.6
Cash flows used for investing activities: |  |  |
Other | (60.4) | (38.2) | (28.3)
Net cash flows used for investing activities | (1,287.3) | (1,066.8) | (1,033.4)
Cash flows used for financing activities: |  |  |
Common stock dividends | (337.7) | (312.2) | (288.3)
Proceeds from issuance of common stock, net | 390.3 | 196.6 | 149.6
Net change in commercial paper | (103.8) | 26.0 | 171.1
Other | (23.2) | (24.0) | (45.2)
Net cash flows from (used for) financing activities | 619.1 | 530.7 | 532.6
Net increase (decrease) in cash, cash equivalents and restricted cash | (7.8) | (8.4) | 20.8
Cash, cash equivalents and restricted cash at beginning of period | 25.5 | 33.9 | 13.1
Cash, cash equivalents and restricted cash at end of period | 17.7 | 25.5 | 33.9
Supplemental cash flows information: |  |  |
Interest | (267.9) | (247.5) | (212.6)
Income taxes, net | 20.5 | (5.0) | (11.3)
Parent Company [Member] |  |  |
Net cash flows from operating activities | 305.0 | 311.0 | 273.0
Cash flows used for investing activities: |  |  |
Capital contributions to consolidated subsidiaries | (250.0) | (625.0) | (290.0)
Net change in notes receivable from and payable to affiliates | 8.0 | 441.0 | 54.0
Net cash flows used for investing activities | (242.0) | (184.0) | (236.0)
Cash flows used for financing activities: |  |  |
Common stock dividends | (338.0) | (312.0) | (288.0)
Proceeds from issuance of common stock, net | 390.0 | 197.0 | 150.0
Net change in commercial paper | (116.0) | (10.0) | 103.0
Other | 1.0 | (2.0) | (2.0)
Net cash flows from (used for) financing activities | (63.0) | (127.0) | (37.0)
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 | (9.0) | (4.0) | (3.0)
Income taxes, net | $ 14.0 | $ 5.0 | $ 0.0

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