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Financing (Total Indebtedness to Capitalization) (Details) $ in Millions | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | --- | --- | ---
Debt Disclosure [Abstract] |  |  |  |
Short-term borrowings | $ 210.0 | $ 4.6 |  |
Long-term debt | 540.6 | 640.3 |  |
Total debt | 750.6 |  |  |
Equity | 1,064.9 | $ 964.0 | $ 783.8 | $ 763.8
Capitalization | $ 1,815.5 |  |  |
Total indebtedness to capitalization | 0.413 |  |  |

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