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Acquisition and Divestiture (CenterPoint Energy and CERC) - Narrative (Details) mi in Thousands, customer in Thousands, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 USD ($) customer mi | Mar. 07, 2025 USD ($) MW | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Feb. 19, 2024 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  | $ 0.0 | $ 0.0 | $ (43.0) | $ 0.0 |  |
Goodwill |  |  | 3,943.0 |  | 3,943.0 |  | $ 3,943.0 |
Maximum transition term | 24 months |  |  |  |  |  |  |
Termination period | 60 days |  |  |  |  |  |  |
Reimbursement of transition services |  |  | 8.8 |  | 24.8 |  |  |
Transition services receivables |  |  | 6.6 |  | 6.6 |  |  |
Posey Solar | Alternative Energy |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Power generation capacity, megawatts | MW |  | 191 |  |  |  |  |  |
Consideration transferred |  | $ 357.0 |  |  |  |  |  |
Lease liabilities incurred |  | $ 35.0 |  |  |  |  |  |
Posey Solar | Alternative Energy | SIGECO |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Percentage of posey solar assets acquired |  | 1 |  |  |  |  |  |
CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on sale |  |  | 0.0 | $ 0.0 | 52.0 | $ 0.0 |  |
Goodwill |  |  | $ 1,461.0 |  | 1,461.0 |  | $ 1,461.0 |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | CenterPoint Energy and CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Receivable for working capital and other customary adjustments |  |  |  |  | 12.0 |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Goodwill | $ 217.0 |  |  |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses | CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 1,200.0
Miles of pipeline (in miles) | mi | 12 |  |  |  |  |  |  |
Number of customers (more than) | customer | 380 |  |  |  |  |  |  |
Goodwill | $ 122.0 |  |  |  |  |  |  |
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Louisiana and Mississippi Regulated Natural Gas LDC Businesses | CenterPoint Energy and CERC |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  | $ 21.0 |  |  |

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