Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 238,418	$ 520,418
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	6,131	6,217
Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	6,964	7,461
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory assets	88,091	89,941
Debt issuance costs
Regulatory Assets [Line Items]
Regulatory assets	3,838	3,921
CLECO POWER
Regulatory Assets [Line Items]
Regulatory assets	254,820	498,883
Regulatory liabilities	(121,426)	(86,005)
Total regulatory assets, net	133,394	412,878
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory liabilities	(6,827)	(6,827)
CLECO POWER | Energy Transition Reserves
Regulatory Assets [Line Items]
Regulatory liabilities	(40,627)	0
CLECO POWER | Interest earned on energy transition reserve
Regulatory Assets [Line Items]
Regulatory liabilities	(50)	0
CLECO POWER | Residential revenue decoupling
Regulatory Assets [Line Items]
Regulatory liabilities	(3,000)	(3,000)
CLECO POWER | Storm reserve
Regulatory Assets [Line Items]
Regulatory liabilities	(70,922)	(76,178)
CLECO POWER | Acquisition/ transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,569	1,596
Regulatory asset, amortization period	14 years 9 months
CLECO POWER | Accumulated deferred fuel
Regulatory Assets [Line Items]
Regulatory assets	$ 6,470	457
CLECO POWER | Affordability study
Regulatory Assets [Line Items]
Regulatory assets	$ 8,614	8,959
Regulatory asset, amortization period	6 years 3 months
CLECO POWER | AFUDC equity gross-up
Regulatory Assets [Line Items]
Regulatory assets	$ 56,510	57,284
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	$ 273	409
Regulatory asset, amortization period	1 year
CLECO POWER | AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 11,481	11,073
CLECO POWER | Coughlin transaction costs | Coughlin transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 746	753
Regulatory asset, amortization period	24 years 3 months
CLECO POWER | COVID-19 executive order
Regulatory Assets [Line Items]
Regulatory assets	$ 3,095	3,372
Regulatory asset, amortization period	2 years 3 months
CLECO POWER | Deferred lignite and mine closure costs and Dolet Hills Power Station closure costs | Deferred lignite and mine closure costs and Dolet Hills Power Station closure costs
Regulatory Assets [Line Items]
Regulatory assets	$ 0	258,951
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory assets	7,942	2,008
CLECO POWER | Dolet Hills carrying charge | Dolet Hills Power Station closure costs
Regulatory Assets [Line Items]
Regulatory assets	5,914	4,729
CLECO POWER | Financing costs
Regulatory Assets [Line Items]
Regulatory assets	5,625	5,717
CLECO POWER | Interest costs
Regulatory Assets [Line Items]
Regulatory assets	2,650	2,712
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets [Line Items]
Regulatory assets	14,567	14,196
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets [Line Items]
Regulatory assets	13,930	14,057
CLECO POWER | Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	58,089	58,089
CLECO POWER | Production operations and maintenance expenses
Regulatory Assets [Line Items]
Regulatory assets	$ 3,901	4,939
Regulatory asset, amortization period	2 years 9 months
CLECO POWER | Rodemacher Unit 2 deferred costs | Rodemacher Unit 2 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	$ 29,306	27,265
CLECO POWER | Solar development costs
Regulatory Assets [Line Items]
Regulatory assets	2,122	2,122
CLECO POWER | St. Mary Clean Energy Center
Regulatory Assets [Line Items]
Regulatory assets	$ 435	870
Regulatory asset, amortization period	3 months
CLECO POWER | Training costs
Regulatory Assets [Line Items]
Regulatory assets	$ 5,423	5,462
Regulatory asset, amortization period	34 years 9 months
CLECO POWER | Tree trimming costs
Regulatory Assets [Line Items]
Regulatory assets	$ 264	943
CLECO POWER | Interest earned on energy transition reserve
Regulatory Assets [Line Items]
Regulatory assets	$ 15,894	$ 12,920