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	Jun. 30, 2025	Dec. 31, 2024
Asset description
Short-term investments	$ 203,069	$ 153,972
Total assets	216,814	165,266
Liability description
Total liabilities	341	256
CLECO POWER
Asset description
Short-term investments	199,644	147,648
Total assets	213,389	158,942
Liability description
Total liabilities	341	256
FTRs
Asset description
Derivative assets	6,067	2,084
Liability description
Derivative liabilities	281	256
FTRs | CLECO POWER
Asset description
Derivative assets	6,067	2,084
Liability description
Derivative liabilities	281	256
Natural gas derivatives
Asset description
Derivative assets	7,678	9,210
Liability description
Derivative liabilities	60	0
Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	7,678	9,210
Liability description
Derivative liabilities	60	0
QUOTED PRICES IN ACTIVE MARKETS FOR IDENTICAL ASSETS (LEVEL 1)
Asset description
Short-term investments	203,069	153,972
Total assets	203,069	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	199,644	147,648
Total assets	199,644	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
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	7,678	9,210
Liability description
Total liabilities	60	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | CLECO POWER
Asset description
Short-term investments	0	0
Total assets	7,678	9,210
Liability description
Total liabilities	60	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	7,678	9,210
Liability description
Derivative liabilities	60	0
SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) | Natural gas derivatives | CLECO POWER
Asset description
Derivative assets	7,678	9,210
Liability description
Derivative liabilities	60	0
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Asset description
Short-term investments	0	0
Total assets	6,067	2,084
Liability description
Total liabilities	281	256
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | CLECO POWER
Asset description
Short-term investments	0	0
Total assets	6,067	2,084
Liability description
Total liabilities	281	256
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs
Asset description
Derivative assets	6,067	2,084
Liability description
Derivative liabilities	281	256
SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3) | FTRs | CLECO POWER
Asset description
Derivative assets	6,067	2,084
Liability description
Derivative liabilities	281	256
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