Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation [Line Items]
Total regulatory assets, net	$ 520,418	$ 571,820,000
Financing costs
Asset Retirement Obligation [Line Items]
Regulatory asset	6,217	6,560,000
Postretirement costs
Asset Retirement Obligation [Line Items]
Regulatory asset	7,461	9,448,000
Fair Value Of Tong-Term Debt
Asset Retirement Obligation [Line Items]
Regulatory asset	89,941	97,345,000
Debt issuance costs
Asset Retirement Obligation [Line Items]
Regulatory asset	3,921	4,254,000
CLECO POWER
Asset Retirement Obligation [Line Items]
Regulatory asset	498,883	587,661,000
Total regulatory liabilities	(86,005)	(133,448,000)
Total regulatory assets, net	412,878	454,213,000
CLECO POWER | Deferred taxes, net
Asset Retirement Obligation [Line Items]
Total regulatory liabilities	(6,827)	(21,939,000)
CLECO POWER | Residential revenue decoupling
Asset Retirement Obligation [Line Items]
Total regulatory liabilities	(3,000)	0
CLECO POWER | Storm reserves
Asset Retirement Obligation [Line Items]
Total regulatory liabilities	(76,178)	(111,509,000)
CLECO POWER | Acadia Unit 1 acquisition costs
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 1,596	1,701,000
Regulatory asset, amortization period	15 years
CLECO POWER | Accumulated deferred fuel
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 457	11,627,000
CLECO POWER | Affordability study
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 8,959	10,337,000
Regulatory asset, amortization period	6 years 6 months
CLECO POWER | AFUDC equity gross-up
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 57,284	60,381,000
CLECO POWER | AMI deferred revenue requirement
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 409	954,000
Regulatory asset, amortization period	1 year 3 months
CLECO POWER | AROs
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 11,073	20,094,000
CLECO POWER | Coughlin transaction costs | Coughlin transaction costs
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 753	784,000
Regulatory asset, amortization period	24 years 6 months
CLECO POWER | COVID-19 executive order
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 3,372	3,039,000
Regulatory asset, amortization period	2 years 6 months
CLECO POWER | Deferred Lignite and Mine closure costs | Deferred lignite and mine closure costs
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 136,778	136,076,000
CLECO POWER | Deferred storm restoration costs
Asset Retirement Obligation [Line Items]
Regulatory asset	0	462,000
CLECO POWER | Deferred taxes, net
Asset Retirement Obligation [Line Items]
Regulatory asset	2,008	43,866,000
CLECO POWER | Dolet Hills carrying charge | Dolet Hills Power Station closure costs
Asset Retirement Obligation [Line Items]
Regulatory asset	4,729	0
CLECO POWER | Dolet Hills Power Station closure costs | Dolet Hills Power Station closure costs
Asset Retirement Obligation [Line Items]
Regulatory asset	122,173	147,323,000
CLECO POWER | Financing costs
Asset Retirement Obligation [Line Items]
Regulatory asset	5,717	6,087,000
CLECO POWER | Interest costs
Asset Retirement Obligation [Line Items]
Regulatory asset	2,712	2,961,000
CLECO POWER | Madison Unit 3 property taxes
Asset Retirement Obligation [Line Items]
Regulatory asset	14,196	13,297,000
CLECO POWER | Non-service cost of postretirement benefits
Asset Retirement Obligation [Line Items]
Regulatory asset	14,057	14,526,000
CLECO POWER | Postretirement costs
Asset Retirement Obligation [Line Items]
Regulatory asset	58,089	64,399,000
CLECO POWER | Production operations and maintenance expenses
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 4,939	7,002,000
Regulatory asset, amortization period	3 years
CLECO POWER | Rodemacher Unit 2 deferred costs | Rodemacher Unit 2 deferred costs
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 27,265	19,282,000
CLECO POWER | Solar development costs
Asset Retirement Obligation [Line Items]
Regulatory asset	2,122	0
CLECO POWER | St. Mary Clean Energy Center
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 870	3,705,000
Regulatory asset, amortization period	6 months
CLECO POWER | Training costs
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 5,462	5,618,000
Regulatory asset, amortization period	35 years
CLECO POWER | Tree trimming costs
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 943	3,657,000
Regulatory asset, amortization period	3 months
CLECO POWER | Other
Asset Retirement Obligation [Line Items]
Regulatory asset	$ 12,920	$ 10,483,000