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Assets Held For Sale - Narrative (Details) - Disposal Group, Held-for-Sale, Not Discontinued Operations - Aquarion - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 27, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from divestiture of business | $ 2,400.0 |  |  |  |
Disposal group, including discontinued operation, equity | 1,600.0 |  |  |  |
Disposal group, including discontinues operation, debt | $ 800.0 |  |  |  |
Disposal group, including discontinued operation, pre-tax income |  | $ 13.0 | $ 6.7 | $ 15.5 | $ 14.4

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