Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees (Details)				1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended		36 Months Ended
	Mar. 14, 2025 USD ($)	Mar. 12, 2025 USD ($)	Apr. 19, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	May 25, 2025 kV	Feb. 29, 2020 USD ($)
Loss Contingencies [Line Items]
Billing settlement credit							$ 60,000,000		$ 60,000,000
Loss contingency, estimate of possible loss				$ 10,200,000		$ 10,200,000		$ 10,200,000
Guarantor obligations, collateral held directly or by third parties, amount								0
ARO increase (decrease)				8,600,000
MISO Load Shed Event
Loss Contingencies [Line Items]
Ongoing forced outage (kilovolt) | kV													500
Energy Transition Property
Loss Contingencies [Line Items]
Acquisition price		$ 305,000,000
Performance Guarantee
Loss Contingencies [Line Items]
Maximum of potential payments				42,400,000		42,400,000		42,400,000
Indemnification Agreement
Loss Contingencies [Line Items]
Maximum of potential payments				40,000,000.0		40,000,000.0		40,000,000.0
Indemnification Agreement including fundamental organizational structure
Loss Contingencies [Line Items]
Maximum of potential payments				400,000,000.0		400,000,000.0		400,000,000.0
LPSC | Dolet Hills
Loss Contingencies [Line Items]
Decrease in regulatory assets									40,000,000
Depreciation									40,000,000
Provision for rate refund and electric customer credits									1,300,000
FERC
Loss Contingencies [Line Items]
Recorded refund				500,000		500,000		500,000
CLECO POWER
Loss Contingencies [Line Items]
Recovery of from energy efficiency programs										$ 10,200,000	$ 10,200,000
Billing settlement credit							60,000,000		60,000,000
Loss contingency, estimate of possible loss				9,700,000		9,700,000		9,700,000
Guarantor obligations, collateral held directly or by third parties, amount								0
CLECO POWER | Term Loan Agreement
Loss Contingencies [Line Items]
Debt repayment commitment	$ 125,000,000	$ 125,000,000
CLECO POWER | Fuel Audit
Loss Contingencies [Line Items]
Fuel expense												$ 1,100,000,000
CLECO POWER | Indemnification Agreement
Loss Contingencies [Line Items]
Maximum of potential payments				40,000,000.0		40,000,000.0		40,000,000.0
CLECO POWER | Indemnification Agreement including fundamental organizational structure
Loss Contingencies [Line Items]
Maximum of potential payments				$ 400,000,000.0		400,000,000.0		$ 400,000,000.0
CLECO POWER | LPSC | Dolet Hills
Loss Contingencies [Line Items]
Decrease in regulatory assets			$ 40,000,000						40,000,000
Annual billing credit settlement			20,000,000			$ 20,000,000	$ 20,000,000
Billing credit settlement			60,000,000
Securitization amount			$ 305,000,000
Depreciation									40,000,000
Provision for rate refund and electric customer credits									$ 1,300,000
Gulf Coast Spinning construction of cotton spinning facility
Loss Contingencies [Line Items]
Allegations by plaintiff, failure to perform					$ 6,500,000
Gulf Coast Spinning construction of cotton spinning facility | Gulf Coast Spinning Company, LLC | Diversified Lands LLC
Loss Contingencies [Line Items]
Loans payable														$ 2,000,000
Gulf Coast Spinning start up costs
Loss Contingencies [Line Items]
Allegations by plaintiff, failure to perform					$ 60,000,000.0