Debt - Narrative (Details) $ in Millions				12 Months Ended
	May 01, 2025 USD ($)	Mar. 14, 2025 USD ($)	Mar. 12, 2025 USD ($)	Dec. 31, 2025 USD ($) creditFacility	Nov. 21, 2025 USD ($)	Nov. 17, 2025 USD ($)
Maximum
Debt Instrument [Line Items]
Debt to capital ratio				0.65
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 175.0
Number of revolving credit facilities | creditFacility				2
Line of credit facility, remaining borrowing capacity				$ 475.0
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fees				0.275%
Interest rate, potential additional interest				0.125%
Commitment fee, potential additional fee				0.05%
Line of Credit | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate				1.725%
Line of Credit | Revolving Credit Facility | ABR
Debt Instrument [Line Items]
Basis spread on variable rate				0.625%
Cleco Power | Maximum
Debt Instrument [Line Items]
Debt to capital ratio				0.65
Cleco Power | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 300.0
Number of revolving credit facilities | creditFacility				1
Cleco Power | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of long-term debt		$ 110.0
Commitment fees				0.15%
Interest rate, potential additional interest				0.125%
Commitment fee, potential additional fee				0.025%
Cleco Power | Line of Credit | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate				1.35%
Cleco Power | Line of Credit | Revolving Credit Facility | ABR
Debt Instrument [Line Items]
Basis spread on variable rate				0.25%
Cleco Power | Term Loan Agreement
Debt Instrument [Line Items]
Repayments of long-term debt		$ 125.0
Cleco Power | Senior Secured Energy Transition Bonds | Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount			$ 305.0
Cleco Power | 4.680 % Senior Secured Energy Transition Bonds | Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount			$ 100.0			$ 75.0
Interest rate			4.68%
Cleco Power | 4.680 % Senior Secured Energy Transition Bonds | Secured Debt | Weighted Average
Debt Instrument [Line Items]
Debt term			5 years 4 months 24 days
Cleco Power | 5.346% Senior Secured Energy Transition Bonds | Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount			$ 205.0
Interest rate			5.346%
Cleco Power | 5.346% Senior Secured Energy Transition Bonds | Secured Debt | Weighted Average
Debt Instrument [Line Items]
Debt term			15 years 6 months
Cleco Power | Go-Zone Bonds
Debt Instrument [Line Items]
Repayments of long-term debt	$ 50.0
Cleco Power | Senior Notes, 5.30%, Due 2026
Debt Instrument [Line Items]
Aggregate principal amount					$ 350.0
Interest rate					5.30%
Cleco Holdings | Line of Credit
Debt Instrument [Line Items]
Number of revolving credit facilities | creditFacility				1