Affiliate Transactions - Summary of Charges From Affiliates (Details) - Cleco Power - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other operations and maintenance | Support Group
Affiliate Transaction [Line Items]
Charges from each affiliate	$ 94,798	$ 73,090	$ 56,669
Taxes other than income taxes | Support Group
Affiliate Transaction [Line Items]
Charges from each affiliate	0	(73)	6
Other expense | Support Group
Affiliate Transaction [Line Items]
Charges from each affiliate	43	64	290
Other expense | Cleco Holdings
Affiliate Transaction [Line Items]
Charges from each affiliate	$ 0	$ 0	$ 1,007