Fair Value Accounting Instruments - Significant Unobservable Inputs Used in Developing Fair Value of Level 3 Positions (Details) - Measured On A Recurring Basis - FTRs $ in Thousands	Dec. 31, 2023 USD ($) $ / MW	Dec. 31, 2022 USD ($) $ / MW
Price Risk Derivatives, at Fair Value, Net [Abstract]
Assets	$ 3,087	$ 2,570
Liabilities	781	294
CLECO POWER
Price Risk Derivatives, at Fair Value, Net [Abstract]
Assets	3,087	2,570
Liabilities	781	294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Price Risk Derivatives, at Fair Value, Net [Abstract]
Assets	3,087	2,570
Liabilities	$ 781	$ 294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Minimum
Price Risk Derivatives, at Fair Value, Net [Abstract]
Forward price range (usd per MWh) | $ / MW	3.51	5.11
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Maximum
Price Risk Derivatives, at Fair Value, Net [Abstract]
Forward price range (usd per MWh) | $ / MW	7.07	13.65
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER
Price Risk Derivatives, at Fair Value, Net [Abstract]
Assets	$ 3,087	$ 2,570
Liabilities	$ 781	$ 294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER | Minimum
Price Risk Derivatives, at Fair Value, Net [Abstract]
Forward price range (usd per MWh) | $ / MW	3.51	5.11
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER | Maximum
Price Risk Derivatives, at Fair Value, Net [Abstract]
Forward price range (usd per MWh) | $ / MW	7.07	13.65