Fair Value Accounting and Financial Instruments - Significant Unobservable Inputs Used in Developing Fair Value of Level 3 Positions (Details) $ in Thousands	Dec. 31, 2021 USD ($) $ / MW	Dec. 31, 2020 USD ($) $ / MW
MINIMUM
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Forward price range (usd per MWh) | $ / MW	(3.94)	(3.49)
MAXIMUM
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Forward price range (usd per MWh) | $ / MW	9.25	4.36
Measured On A Recurring Basis | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets | $	$ 6,977	$ 4,805
Liabilities | $	$ 834	$ 1,625
CLECO POWER | MINIMUM
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Forward price range (usd per MWh) | $ / MW	(4.91)	(3.34)
CLECO POWER | MAXIMUM
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Forward price range (usd per MWh) | $ / MW	9.25	4.36
CLECO POWER | Measured On A Recurring Basis | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Assets | $	$ 5,515	$ 4,337
Liabilities | $	$ 597	$ 1,121