Regulatory Assets and Liabilities - Schedule of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Regulatory Assets [Line Items]
Total regulatory assets, net	$ 801,557	$ 801,363
Financing costs
Regulatory Assets [Line Items]
Regulatory assets	7,161	7,248
Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	12,927	13,424
Fair value of long-term debt
Regulatory Assets [Line Items]
Regulatory assets	110,300	112,150
Debt issuance costs
Regulatory Assets [Line Items]
Regulatory assets	4,837	4,920
CLECO POWER
Regulatory Assets [Line Items]
Regulatory assets	747,258	759,165
Regulatory liabilities	(80,926)	(95,544)
Total regulatory assets, net	666,332	663,621
CLECO POWER | Acquisition/ transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 1,886	1,913
Regulatory asset, amortization period	17 years 9 months
CLECO POWER | Acquisition/ transaction costs | Coughlin transaction costs
Regulatory Assets [Line Items]
Regulatory assets	$ 838	845
Regulatory asset, amortization period	27 years 3 months
CLECO POWER | Accumulated deferred fuel
Regulatory Assets [Line Items]
Regulatory assets	$ 49,597	56,826
CLECO POWER | Affordability study
Regulatory Assets [Line Items]
Regulatory assets	$ 12,749	13,094
Regulatory asset, amortization period	9 years 3 months
CLECO POWER | AFUDC equity gross-up
Regulatory Assets [Line Items]
Regulatory assets	$ 65,799	66,574
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	$ 1,909	2,045
Regulatory asset, amortization period	4 years
CLECO POWER | AROs
Regulatory Assets [Line Items]
Regulatory assets	$ 15,644	15,141
CLECO POWER | Bayou Vista to Segura deferred revenue requirement
Regulatory Assets [Line Items]
Regulatory assets	3,209	1,392
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	16,729	17,113
CLECO POWER | Deferred storm restoration costs - Hurricane Ida
Regulatory Assets [Line Items]
Regulatory assets	37,841	37,617
CLECO POWER | Deferred storm restoration costs - Hurricane Laura
Regulatory Assets [Line Items]
Regulatory assets	53,061	54,282
CLECO POWER | Deferred storm restoration costs - Hurricane Zeta
Regulatory Assets [Line Items]
Regulatory assets	3,212	3,296
CLECO POWER | Deferred storm restoration costs - Winter Storms Uri & Viola
Regulatory Assets [Line Items]
Regulatory assets	1,912	1,912
CLECO POWER | Station closure costs | Dolet Hills
Regulatory Assets [Line Items]
Regulatory assets	145,978	145,844
CLECO POWER | Energy efficiency
Regulatory Assets [Line Items]
Regulatory assets	$ 1,293	1,645
Regulatory asset, amortization period	1 year
CLECO POWER | Financing costs
Regulatory Assets [Line Items]
Regulatory assets	$ 6,733	6,826
CLECO POWER | Interest costs
Regulatory Assets [Line Items]
Regulatory assets	3,397	3,459
CLECO POWER | Mine closure costs | Lignite Mine
Regulatory Assets [Line Items]
Regulatory assets	135,877	136,980
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets [Line Items]
Regulatory assets	10,597	8,362
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets [Line Items]
Regulatory assets	13,542	12,950
CLECO POWER | Other
Regulatory Assets [Line Items]
Regulatory assets	9,200	11,224
CLECO POWER | Postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	114,690	117,773
CLECO POWER | Production operations and maintenance expenses
Regulatory Assets [Line Items]
Regulatory assets	$ 10,304	11,058
Regulatory asset, amortization period	3 years
CLECO POWER | Rodemacher Unit 2 deferred costs | Rodemacher Unit 2 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	$ 8,350	6,931
CLECO POWER | St. Mary Clean Energy Center
Regulatory Assets [Line Items]
Regulatory assets	$ 5,654	6,089
Regulatory asset, amortization period	3 years 3 months
CLECO POWER | Training costs
Regulatory Assets [Line Items]
Regulatory assets	$ 5,891	5,929
Regulatory asset, amortization period	37 years 9 months
CLECO POWER | Tree trimming costs
Regulatory Assets [Line Items]
Regulatory assets	$ 8,413	9,092
Regulatory asset, amortization period	3 years
CLECO POWER | Deferred taxes, net
Regulatory Assets [Line Items]
Regulatory liabilities	$ (80,926)	$ (95,544)