Affiliate Transactions - Summary of Balances Payable To or Due From Affiliates (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Related Party Transaction [Line Items]
ACCOUNTS PAYABLE	$ 41,283	$ 41,283
CLECO POWER
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	15,792	14,605
ACCOUNTS PAYABLE	71,389	72,068
CLECO POWER | Cleco Holdings
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	10,513	10,353
ACCOUNTS PAYABLE	57,697	57,713
CLECO POWER | Support Group
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	4,589	3,248
ACCOUNTS PAYABLE	13,665	14,355
CLECO POWER | Cleco Cajun
Related Party Transaction [Line Items]
ACCOUNTS RECEIVABLE	690	1,004
ACCOUNTS PAYABLE	$ 27	$ 0