Fair Value Accounting Instruments - Fair Value of Financial Assets and Liabilities Measured On A Recurring Basis (Details) - Measured On A Recurring Basis - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Asset Description
Money market funds	$ 182,574	$ 145,033
Total assets	291,308	239,474
Liability Description
Total liabilities	8,841	834
FTRs
Asset Description
Derivative assets	3,088	6,977
Liability Description
Derivative liabilities	1,862	834
Natural gas derivatives
Asset Description
Derivative assets	105,646	87,464
Liability Description
Derivative liabilities	6,979	0
CLECO POWER
Asset Description
Money market funds	139,752	82,411
Total assets	142,322	87,926
Liability Description
Total liabilities	4,864	597
CLECO POWER | FTRs
Asset Description
Derivative assets	2,570	5,515
Liability Description
Derivative liabilities	294	597
CLECO POWER | Natural gas derivatives
Liability Description
Derivative liabilities	4,570	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)
Asset Description
Money market funds	182,574	145,033
Total assets	182,574	145,033
Liability Description
Total liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | FTRs
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | Natural gas derivatives
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | CLECO POWER
Asset Description
Money market funds	139,752	82,411
Total assets	139,752	82,411
Liability Description
Total liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | CLECO POWER | FTRs
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | CLECO POWER | Natural gas derivatives
Liability Description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Asset Description
Money market funds	0	0
Total assets	105,646	87,464
Liability Description
Total liabilities	6,979	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | FTRs
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Natural gas derivatives
Asset Description
Derivative assets	105,646	87,464
Liability Description
Derivative liabilities	6,979	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER
Asset Description
Money market funds	0	0
Total assets	0	0
Liability Description
Total liabilities	4,570	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER | FTRs
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER | Natural gas derivatives
Liability Description
Derivative liabilities	4,570	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Asset Description
Money market funds	0	0
Derivative assets	3,088	6,977
Total assets	3,088	6,977
Liability Description
Derivative liabilities	1,862	834
Total liabilities	1,862	834
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs
Asset Description
Derivative assets	3,088	6,977
Liability Description
Derivative liabilities	1,862	834
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Natural gas derivatives
Asset Description
Derivative assets	0	0
Liability Description
Derivative liabilities	0	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER
Asset Description
Money market funds	0	0
Derivative assets	2,570	5,515
Total assets	2,570	5,515
Liability Description
Derivative liabilities	294	597
Total liabilities	294	597
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER | FTRs
Asset Description
Derivative assets	2,570	5,515
Liability Description
Derivative liabilities	294	597
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER | Natural gas derivatives
Liability Description
Derivative liabilities	$ 0	$ 0