Affiliate Transactions - Summary of Balances Payable To or Due From Affiliates (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	$ 35,250	$ 33,780
CLECO POWER
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	13,388	14,481
ACCOUNTS PAYABLE	14,688	14,123
CLECO POWER | Cleco Holdings
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	10,349	10,351
ACCOUNTS PAYABLE	102	194
CLECO POWER | Support Group
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	2,031	3,172
ACCOUNTS PAYABLE	14,580	13,890
CLECO POWER | Cleco Cajun
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	1,008	958
ACCOUNTS PAYABLE	$ 6	$ 39