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Acquisition and Divestiture (CenterPoint Energy and CERC) - Narrative (Details) mi in Thousands, customer in Thousands, $ in Millions			3 Months Ended
	Mar. 31, 2025 USD ($) customer mi	Mar. 07, 2025 USD ($) MW	Mar. 31, 2025 USD ($) customer mi	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Feb. 19, 2024 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill	$ 3,943.0		$ 3,943.0		$ 3,943.0
Maximum transition term	24 months
Termination period	60 days
Receivable from buyers for reimbursement			7.5
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
CERC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale			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]
Gain on sale			(43.0)
Goodwill	$ 217.0		$ 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		12
Number of customers (more than) | customer	380		380
Gain on sale			$ 52.0
Goodwill	$ 122.0		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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