Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 565,100	$ 564,123
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	6,646	6,904
Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	9,945	11,436
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory assets	99,196	104,748
Debt issuance costs
Regulatory Assets [Line Items]
Regulatory assets	4,337	4,587
CLECO POWER
Regulatory Assets [Line Items]
Regulatory assets	582,980	598,100
Regulatory liabilities	(138,004)	(161,652)
Total regulatory assets, net	444,976	436,448
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory liabilities	(31,215)	(42,890)
CLECO POWER | Storm reserves
Regulatory Assets [Line Items]
Regulatory liabilities	(106,789)	(118,762)
CLECO POWER | Acquisition/ transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,728	1,807
Regulatory asset, amortization period	16 years 3 months
CLECO POWER | Acquisition/ transaction costs | Coughlin transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 792	815
Regulatory asset, amortization period	25 years 9 months
CLECO POWER | Accumulated deferred fuel
Regulatory Assets [Line Items]
Regulatory assets	$ 20,241	57,881
CLECO POWER | Affordability study
Regulatory Assets [Line Items]
Regulatory assets	$ 10,682	11,715
Regulatory asset, amortization period	7 years 9 months
CLECO POWER | AFUDC equity gross-up
Regulatory Assets [Line Items]
Regulatory assets	$ 61,155	63,477
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	$ 1,090	1,499
Regulatory asset, amortization period	2 years 6 months
CLECO POWER | AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 19,368	17,218
CLECO POWER | Bayou Vista to Segura transmission project deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	0	2,510
CLECO POWER | COVID-19 executive order
Regulatory Assets [Line Items]
Regulatory assets	3,007	2,953
CLECO POWER | Deferred lignite and mine closure costs | Deferred lignite and mine closure costs
Regulatory Assets [Line Items]
Regulatory assets	135,624	133,587
CLECO POWER | Deferred storm restoration costs - Hurricane Delta
Regulatory Assets [Line Items]
Regulatory assets	88	109
CLECO POWER | Deferred storm restoration costs - Hurricane Ida
Regulatory Assets [Line Items]
Regulatory assets	0	9,409
CLECO POWER | Deferred storm restoration costs - Hurricane Laura
Regulatory Assets [Line Items]
Regulatory assets	367	457
CLECO POWER | Deferred storm restoration costs - Hurricane Zeta
Regulatory Assets [Line Items]
Regulatory assets	7	9
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory assets	45,463	8,803
CLECO POWER | Dolet Hills Power Station closure costs | Dolet Hills Power Station closure costs
Regulatory Assets [Line Items]
Regulatory assets	147,306	147,082
CLECO POWER | Energy efficiency
Regulatory Assets [Line Items]
Regulatory assets	0	235
CLECO POWER | Financing costs
Regulatory Assets [Line Items]
Regulatory assets	6,179	6,456
CLECO POWER | Interest costs
Regulatory Assets [Line Items]
Regulatory assets	3,023	3,210
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets [Line Items]
Regulatory assets	13,139	13,038
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets [Line Items]
Regulatory assets	14,692	14,810
CLECO POWER | Other
Regulatory Assets [Line Items]
Regulatory assets	13,345	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	$ 8,012	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	$ 17,317	12,645
CLECO POWER | St. Mary Clean Energy Center
Regulatory Assets [Line Items]
Regulatory assets	$ 3,045	4,350
Regulatory asset, amortization period	1 year 9 months
CLECO POWER | Training costs
Regulatory Assets [Line Items]
Regulatory assets	$ 5,657	5,774
Regulatory asset, amortization period	36 years 3 months
CLECO POWER | Tree trimming costs
Regulatory Assets [Line Items]
Regulatory assets	$ 4,336	$ 6,377
Regulatory asset, amortization period	1 year 6 months