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	Sep. 30, 2020 USD ($) $ / MW	Dec. 31, 2019 USD ($) $ / MW
FAIR VALUE
ASSETS | $	$ 7,907	$ 6,822
LIABILITIES | $	2,580	1,044
CLECO POWER
FAIR VALUE
ASSETS | $	7,177	6,311
LIABILITIES | $	$ 1,765	$ 586
Minimum
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	(4.01)	(2.57)
Minimum | CLECO POWER
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	(2.41)	(2.04)
Maximum
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	4.62	2.86
Maximum | CLECO POWER
FAIR VALUE
FORWARD PRICE RANGE (usd per mwh) | $ / MW	4.62	2.86