Regulatory Assets and Liabilities - Summary of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 571,820	$ 564,123
Financing costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	6,560	6,904
Postretirement costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	9,448	11,436
Fair value of long-term debt
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	97,345	104,748
Debt issuance costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	4,254	4,587
CLECO POWER
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	587,661	598,100
Total regulatory liabilities	(133,448)	(161,652)
Total regulatory assets, net	454,213	436,448
CLECO POWER | Deferred taxes, net
Regulatory Assets and Liabilities [Line Items]
Total regulatory liabilities	(21,939)	(42,890)
CLECO POWER | Storm reserves
Regulatory Assets and Liabilities [Line Items]
Total regulatory liabilities	(111,509)	(118,762)
CLECO POWER | Acadia Unit 1 acquisition costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 1,701	1,807
Regulatory asset, amortization period	16 years
CLECO POWER | Acadia Unit 1 acquisition costs | Coughlin transaction costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 784	815
Regulatory asset, amortization period	25 years 6 months
CLECO POWER | Accumulated deferred fuel
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 11,627	57,881
CLECO POWER | Affordability study
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 10,337	11,715
Regulatory asset, amortization period	7 years 6 months
CLECO POWER | AFUDC equity gross-up
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 60,381	63,477
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 954	1,499
Regulatory asset, amortization period	2 years 3 months
CLECO POWER | AROs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 20,094	17,218
CLECO POWER | Bayou Vista to Segura transmission project deferred revenue requirement
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	0	2,510
CLECO POWER | COVID-19 executive order
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	3,039	2,953
CLECO POWER | Deferred Lignite and Mine closure costs | Lignite Mine
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	136,076	133,587
CLECO POWER | Deferred storm restoration costs - Hurricane Delta
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	88	109
CLECO POWER | Deferred storm restoration costs - Hurricane Ida
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	0	9,409
CLECO POWER | Deferred storm restoration costs - Hurricane Laura
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	367	457
CLECO POWER | Deferred storm restoration costs - Hurricane Zeta
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	7	9
CLECO POWER | Deferred taxes, net
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	43,866	8,803
CLECO POWER | Dolet Hills Power Station closure costs | Dolet Hills
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	147,323	147,082
CLECO POWER | Energy efficiency
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	0	235
CLECO POWER | Financing costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	6,087	6,456
CLECO POWER | Interest costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	2,961	3,210
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	13,297	13,038
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	14,526	14,810
CLECO POWER | Other
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	10,483	14,114
CLECO POWER | Postretirement costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	64,399	47,317
CLECO POWER | Production operations and maintenance expenses
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 7,002	10,443
Regulatory asset, amortization period	3 years
CLECO POWER | Rodemacher Unit 2 deferred costs | Rodemacher Unit 2 deferred costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 19,282	12,645
CLECO POWER | St. Mary Clean Energy Center
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 3,705	4,350
Regulatory asset, amortization period	1 year 6 months
CLECO POWER | Training costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 5,618	5,774
Regulatory asset, amortization period	36 years
CLECO POWER | Tree trimming costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 3,657	$ 6,377
Regulatory asset, amortization period	1 year 3 months