Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 518,746	$ 564,123
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	10,939	11,436
Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	102,897	104,748
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory assets	6,818	6,904
Debt issuance costs
Regulatory Assets [Line Items]
Regulatory assets	4,504	4,587
CLECO POWER
Regulatory Assets [Line Items]
Regulatory assets	555,671	598,100
Regulatory liabilities	(162,083)	(161,652)
Total regulatory assets, net	393,588	436,448
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory liabilities	(42,143)	(42,890)
CLECO POWER | Storm reserves
Regulatory Assets [Line Items]
Regulatory liabilities	(119,940)	(118,762)
CLECO POWER | Acquisition/ transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,781	1,807
Regulatory asset, amortization period	16 years 9 months
CLECO POWER | Acquisition/ transaction costs | Coughlin transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 807	815
Regulatory asset, amortization period	26 years 3 months
CLECO POWER | Accumulated deferred fuel
Regulatory Assets [Line Items]
Regulatory assets	$ 5,910	57,881
CLECO POWER | Affordability study
Regulatory Assets [Line Items]
Regulatory assets	$ 11,371	11,715
Regulatory asset, amortization period	8 years 3 months
CLECO POWER | AFUDC equity gross-up
Regulatory Assets [Line Items]
Regulatory assets	$ 62,703	63,477
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	$ 1,363	1,499
Regulatory asset, amortization period	3 years
CLECO POWER | AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 17,847	17,218
CLECO POWER | Bayou Vista to Segura transmission project deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	$ 1,255	2,510
Regulatory asset, amortization period	3 months
CLECO POWER | Deferred lignite and mine closure costs | Lignite Mine
Regulatory Assets [Line Items]
Regulatory assets	$ 133,973	133,587
CLECO POWER | COVID-19 executive order
Regulatory Assets [Line Items]
Regulatory assets	2,953	2,953
CLECO POWER | Deferred storm restoration costs - Hurricane Delta
Regulatory Assets [Line Items]
Regulatory assets	109	109
CLECO POWER | Deferred storm restoration costs - Hurricane Ida
Regulatory Assets [Line Items]
Regulatory assets	9,523	9,409
CLECO POWER | Deferred storm restoration costs - Hurricane Laura
Regulatory Assets [Line Items]
Regulatory assets	457	457
CLECO POWER | Deferred storm restoration costs - Hurricane Zeta
Regulatory Assets [Line Items]
Regulatory assets	9	9
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory assets	20,467	8,803
CLECO POWER | Station closure costs | Dolet Hills
Regulatory Assets [Line Items]
Regulatory assets	147,137	147,082
CLECO POWER | Energy efficiency
Regulatory Assets [Line Items]
Regulatory assets	0	235
CLECO POWER | Financing costs
Regulatory Assets [Line Items]
Regulatory assets	6,364	6,456
CLECO POWER | Interest costs
Regulatory Assets [Line Items]
Regulatory assets	3,148	3,210
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets [Line Items]
Regulatory assets	13,121	13,038
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets [Line Items]
Regulatory assets	14,954	14,810
CLECO POWER | Other
Regulatory Assets [Line Items]
Regulatory assets	13,921	14,114
CLECO POWER | Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	47,317	47,317
CLECO POWER | Production operations and maintenance expenses
Regulatory Assets [Line Items]
Regulatory assets	$ 9,731	10,443
Regulatory asset, amortization period	3 years
CLECO POWER | Rodemacher Unit 2 deferred costs | Rodemacher Unit 2 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	$ 14,101	12,645
CLECO POWER | St. Mary Clean Energy Center
Regulatory Assets [Line Items]
Regulatory assets	$ 3,915	4,350
Regulatory asset, amortization period	2 years 3 months
CLECO POWER | Training costs
Regulatory Assets [Line Items]
Regulatory assets	$ 5,735	5,774
Regulatory asset, amortization period	36 years 9 months
CLECO POWER | Tree trimming costs
Regulatory Assets [Line Items]
Regulatory assets	$ 5,699	$ 6,377
Regulatory asset, amortization period	2 years