Fair Value Accounting - Significant Unobservable Inputs Used in Developing Fair Value of Level 3 Positions (Details) - Measured on a Recurring Basis - Level 3 $ in Thousands	Jun. 30, 2021 USD ($) $ / MW	Dec. 31, 2020 USD ($) $ / MW
FAIR VALUE
ASSETS | $	$ 8,662	$ 4,805
LIABILITIES | $	1,161	1,625
CLECO POWER
FAIR VALUE
ASSETS | $	6,867	4,337
LIABILITIES | $	$ 877	$ 1,121
Minimum
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	(5.73)	(3.49)
Minimum | CLECO POWER
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	(2.03)	(3.34)
Maximum
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	7.28	4.36
Maximum | CLECO POWER
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	7.28	4.36