Fair Value Accounting Instruments - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) - Measured on a Recurring Basis - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Asset description
Short-term investments	$ 173,224	$ 153,972
Total assets	187,497	165,266
Liability description
Total liabilities	138	256
CLECO POWER
Asset description
Short-term investments	169,000	147,648
Total assets	183,273	158,942
Liability description
Total liabilities	138	256
FTRs
Asset description
Derivative assets	588	2,084
Liability description
Derivative liabilities	138	256
FTRs | CLECO POWER
Asset description
Derivative assets	588	2,084
Liability description
Derivative liabilities	138	256
Natural gas derivatives
Asset description
Derivative assets	13,685	9,210
Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	13,685	9,210
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)
Asset description
Short-term investments	173,224	153,972
Total assets	173,224	153,972
Liability description
Total liabilities	0	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | CLECO POWER
Asset description
Short-term investments	169,000	147,648
Total assets	169,000	147,648
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
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1) | Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2)
Asset description
Short-term investments	0	0
Total assets	13,685	9,210
Liability description
Total liabilities	0	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER
Asset description
Short-term investments	0	0
Total assets	13,685	9,210
Liability description
Total liabilities	0	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) | 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	13,685	9,210
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	13,685	9,210
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Asset description
Short-term investments	0	0
Total assets	588	2,084
Liability description
Total liabilities	138	256
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER
Asset description
Short-term investments	0	0
Total assets	588	2,084
Liability description
Total liabilities	138	256
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs
Asset description
Derivative assets	588	2,084
Liability description
Derivative liabilities	138	256
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs | CLECO POWER
Asset description
Derivative assets	588	2,084
Liability description
Derivative liabilities	138	256
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Natural gas derivatives
Asset description
Derivative assets	0	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	$ 0	$ 0