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	Jun. 30, 2023	Dec. 31, 2022
Asset description
Short-term investments	$ 199,672	$ 172,741
Total assets	207,918	175,311
Liability description
Total liabilities	1,519	4,864
CLECO POWER
Asset description
Short-term investments	158,483	139,752
Total assets	166,729	142,322
Liability description
Total liabilities	1,519	4,864
FTRs
Asset description
Derivative assets	7,330	2,570
Liability description
Derivative liabilities	871	294
FTRs | CLECO POWER
Asset description
Derivative assets	7,330	2,570
Liability description
Derivative liabilities	871	294
Natural gas derivatives
Asset description
Derivative assets	916	0
Liability description
Derivative liabilities	648	4,570
Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	916	0
Liability description
Derivative liabilities	648	4,570
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)
Asset description
Short-term investments	199,672	172,741
Total assets	199,672	172,741
Liability description
Total liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | CLECO POWER
Asset description
Short-term investments	158,483	139,752
Total assets	158,483	139,752
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) | FTRs | CLECO POWER
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) | Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	0	0
Liability description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Asset description
Short-term investments	0	0
Total assets	916	0
Liability description
Total liabilities	648	4,570
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER
Asset description
Short-term investments	0	0
Total assets	916	0
Liability description
Total liabilities	648	4,570
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) | FTRs | CLECO POWER
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	916	0
Liability description
Derivative liabilities	648	4,570
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	916	0
Liability description
Derivative liabilities	648	4,570
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Asset description
Short-term investments	0	0
Total assets	7,330	2,570
Liability description
Total liabilities	871	294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER
Asset description
Short-term investments	0	0
Total assets	7,330	2,570
Liability description
Total liabilities	871	294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs
Asset description
Derivative assets	7,330	2,570
Liability description
Derivative liabilities	871	294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs | CLECO POWER
Asset description
Derivative assets	7,330	2,570
Liability description
Derivative liabilities	871	294
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) | Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	0	0
Liability description
Derivative liabilities	$ 0	$ 0