Fair Value Accounting Instruments - Schedule of Significant Unobservable Inputs Used in Developing Fair Value of Level 3 Positions (Details) - Measured on a Recurring Basis - FTRs $ in Thousands	Sep. 30, 2025 USD ($) $ / MW	Dec. 31, 2024 USD ($) $ / MW
Price Risk Derivatives, at Fair Value, Net [Abstract]
ASSETS	$ 4,315	$ 2,084
LIABILITIES	297	256
CLECO POWER
Price Risk Derivatives, at Fair Value, Net [Abstract]
ASSETS	4,315	2,084
LIABILITIES	297	256
Level 3
Price Risk Derivatives, at Fair Value, Net [Abstract]
ASSETS	4,315	2,084
LIABILITIES	$ 297	$ 256
Level 3 | Low
Price Risk Derivatives, at Fair Value, Net [Abstract]
INPUT/RANGE PRICE (usd per mwh) | $ / MW	(3.89)	(4.39)
Level 3 | High
Price Risk Derivatives, at Fair Value, Net [Abstract]
INPUT/RANGE PRICE (usd per mwh) | $ / MW	8.60	8.49
Level 3 | Weighted Average
Price Risk Derivatives, at Fair Value, Net [Abstract]
INPUT/RANGE PRICE (usd per mwh) | $ / MW	0.39	0.27
Level 3 | CLECO POWER
Price Risk Derivatives, at Fair Value, Net [Abstract]
ASSETS	$ 4,315	$ 2,084
LIABILITIES	$ 297	$ 256
Level 3 | CLECO POWER | Low
Price Risk Derivatives, at Fair Value, Net [Abstract]
INPUT/RANGE PRICE (usd per mwh) | $ / MW	(3.89)	(4.39)
Level 3 | CLECO POWER | High
Price Risk Derivatives, at Fair Value, Net [Abstract]
INPUT/RANGE PRICE (usd per mwh) | $ / MW	8.60	8.49
Level 3 | CLECO POWER | Weighted Average
Price Risk Derivatives, at Fair Value, Net [Abstract]
INPUT/RANGE PRICE (usd per mwh) | $ / MW	0.39	0.27