Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 534,290	$ 571,820
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	6,474	6,560
Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	8,952	9,448
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory assets	95,493	97,345
Debt issuance costs
Regulatory Assets [Line Items]
Regulatory assets	4,171	4,254
CLECO POWER
Regulatory Assets [Line Items]
Regulatory assets	544,637	587,661
Regulatory liabilities	(125,437)	(133,448)
Total regulatory assets, net	419,200	454,213
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory liabilities	(12,531)	(21,939)
CLECO POWER | Storm reserves
Regulatory Assets [Line Items]
Regulatory liabilities	(112,906)	(111,509)
CLECO POWER | Acquisition/ transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,675	1,701
Regulatory asset, amortization period	15 years 9 months
CLECO POWER | Acquisition/ transaction costs | Coughlin transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 776	784
Regulatory asset, amortization period	25 years 3 months
CLECO POWER | Accumulated deferred fuel
Regulatory Assets [Line Items]
Regulatory assets	$ 9,382	11,627
CLECO POWER | Affordability study
Regulatory Assets [Line Items]
Regulatory assets	$ 9,992	10,337
Regulatory asset, amortization period	7 years 3 months
CLECO POWER | AFUDC equity gross-up
Regulatory Assets [Line Items]
Regulatory assets	$ 59,606	60,381
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	$ 818	954
Regulatory asset, amortization period	2 years
CLECO POWER | AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 8,526	20,094
CLECO POWER | COVID-19 executive order
Regulatory Assets [Line Items]
Regulatory assets	3,071	3,039
CLECO POWER | Deferred lignite and mine closure costs | Deferred lignite and mine closure costs
Regulatory Assets [Line Items]
Regulatory assets	134,739	136,076
CLECO POWER | Deferred storm restoration costs - Hurricane Delta
Regulatory Assets [Line Items]
Regulatory assets	88	88
CLECO POWER | Deferred storm restoration costs - Hurricane Laura
Regulatory Assets [Line Items]
Regulatory assets	367	367
CLECO POWER | Deferred storm restoration costs - Hurricane Zeta
Regulatory Assets [Line Items]
Regulatory assets	7	7
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory assets	44,157	43,866
CLECO POWER | Dolet Hills Power Station closure costs | Dolet Hills Power Station closure costs
Regulatory Assets [Line Items]
Regulatory assets	122,495	147,323
CLECO POWER | Financing costs
Regulatory Assets [Line Items]
Regulatory assets	5,994	6,087
CLECO POWER | Interest costs
Regulatory Assets [Line Items]
Regulatory assets	2,899	2,961
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets [Line Items]
Regulatory assets	13,372	13,297
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets [Line Items]
Regulatory assets	14,482	14,526
CLECO POWER | Other
Regulatory Assets [Line Items]
Regulatory assets	9,268	10,483
CLECO POWER | Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	64,399	64,399
CLECO POWER | Production operations and maintenance expenses
Regulatory Assets [Line Items]
Regulatory assets	$ 5,980	7,002
Regulatory asset, amortization period	3 years
CLECO POWER | Rodemacher Unit 2 deferred costs | Rodemacher Unit 2 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	$ 21,264	19,282
CLECO POWER | St. Mary Clean Energy Center
Regulatory Assets [Line Items]
Regulatory assets	$ 2,722	3,705
Regulatory asset, amortization period	1 year 3 months
CLECO POWER | Training costs
Regulatory Assets [Line Items]
Regulatory assets	$ 5,579	5,618
Regulatory asset, amortization period	35 years 9 months
CLECO POWER | Tree trimming costs
Regulatory Assets [Line Items]
Regulatory assets	$ 2,979	$ 3,657
Regulatory asset, amortization period	1 year