Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 277,973	$ 520,418
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	6,045	6,217
Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	6,467	7,461
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory assets	86,241	89,941
Debt issuance costs
Regulatory Assets [Line Items]
Regulatory assets	3,743	3,921
CLECO POWER
Regulatory Assets [Line Items]
Regulatory assets	292,547	498,883
Regulatory liabilities	(117,070)	(86,005)
Total regulatory assets, net	175,477	412,878
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory liabilities	(6,357)	(6,827)
CLECO POWER | Energy transition reserve
Regulatory Assets [Line Items]
Regulatory liabilities	(39,842)	0
CLECO POWER | Interest earned on energy transition reserve
Regulatory Assets [Line Items]
Regulatory liabilities	(238)	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	(67,633)	(76,178)
CLECO POWER | Acquisition/ transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,543	1,596
Regulatory asset, amortization period	14 years 6 months
CLECO POWER | Accumulated deferred fuel
Regulatory Assets [Line Items]
Regulatory assets	$ 30,193	457
CLECO POWER | Affordability study
Regulatory Assets [Line Items]
Regulatory assets	$ 8,270	8,959
Regulatory asset, amortization period	6 years
CLECO POWER | AFUDC equity gross-up
Regulatory Assets [Line Items]
Regulatory assets	$ 55,736	57,284
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	$ 136	409
Regulatory asset, amortization period	9 months
CLECO POWER | AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 11,894	11,073
CLECO POWER | Coughlin transaction costs | Coughlin transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 738	753
Regulatory asset, amortization period	24 years
CLECO POWER | COVID-19 executive order
Regulatory Assets [Line Items]
Regulatory assets	$ 2,818	3,372
Regulatory asset, amortization period	2 years
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	14,312	2,008
CLECO POWER | Dolet Hills carrying charge | Dolet Hills carrying charge
Regulatory Assets [Line Items]
Regulatory assets	8,278	4,729
CLECO POWER | Financing costs
Regulatory Assets [Line Items]
Regulatory assets	5,532	5,717
CLECO POWER | Interest costs
Regulatory Assets [Line Items]
Regulatory assets	2,587	2,712
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets [Line Items]
Regulatory assets	14,912	14,196
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets [Line Items]
Regulatory assets	13,634	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	$ 2,884	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	$ 31,396	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	0	870
CLECO POWER | Training costs
Regulatory Assets [Line Items]
Regulatory assets	$ 5,385	5,462
Regulatory asset, amortization period	34 years 6 months
CLECO POWER | Tree trimming costs
Regulatory Assets [Line Items]
Regulatory assets	$ 0	943
CLECO POWER | Interest earned on energy transition reserve
Regulatory Assets [Line Items]
Regulatory assets	$ 22,088	$ 12,920