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	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset description
Money market funds	$ 208,771	$ 172,741
Total assets	209,831	175,311
Liability description
Total liabilities	9,499	4,864
CLECO POWER
Asset description
Money market funds	172,982	139,752
Total assets	174,042	142,322
Liability description
Total liabilities	9,499	4,864
FTRs
Asset description
Derivative assets	837	2,570
Liability description
Derivative liabilities	204	294
FTRs | CLECO POWER
Asset description
Derivative assets	837	2,570
Liability description
Derivative liabilities	204	294
Natural Gas Derivatives [Member]
Asset description
Derivative assets	223	0
Liability description
Derivative liabilities	9,295	4,570
Natural Gas Derivatives [Member] | CLECO POWER
Asset description
Derivative assets	223	0
Liability description
Derivative liabilities	9,295	4,570
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)
Asset description
Money market funds	208,771	172,741
Total assets	208,771	172,741
Liability description
Total liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | CLECO POWER
Asset description
Money market funds	172,982	139,752
Total assets	172,982	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 [Member]
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 [Member] | CLECO POWER
Asset description
Derivative assets	0	0
Liability description
Derivative liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Asset description
Money market funds	0	0
Total assets	223	0
Liability description
Total liabilities	9,295	4,570
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER
Asset description
Money market funds	0	0
Total assets	223	0
Liability description
Total liabilities	9,295	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 [Member]
Asset description
Derivative assets	223	0
Liability description
Derivative liabilities	9,295	4,570
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Natural Gas Derivatives [Member] | CLECO POWER
Asset description
Derivative assets	223	0
Liability description
Derivative liabilities	9,295	4,570
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Asset description
Money market funds	0	0
Total assets	837	2,570
Liability description
Total liabilities	204	294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER
Asset description
Money market funds	0	0
Total assets	837	2,570
Liability description
Total liabilities	204	294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs
Asset description
Derivative assets	837	2,570	$ 2,570
Liability description
Derivative liabilities	204	294	294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs | CLECO POWER
Asset description
Derivative assets	837	2,570	2,570
Liability description
Derivative liabilities	204	294	$ 294
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Natural Gas Derivatives [Member]
Asset description
Derivative assets	0	0
Liability description
Derivative liabilities	0	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Natural Gas Derivatives [Member] | CLECO POWER
Asset description
Derivative assets	0	0
Liability description
Derivative liabilities	$ 0	$ 0