Regulatory Assets and Liabilities - Summary of Regulatory Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Jun. 16, 2021	Dec. 31, 2020
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets, net	$ 801,363		$ 423,279
Financing costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	7,248		7,592
Postretirement costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	13,424		15,411
Fair value of long-term debt
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	112,150		119,553
Debt issuance costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	4,920		5,254
CLECO POWER
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	759,165		456,034
Total regulatory liabilities	(95,544)		(180,565)
Total regulatory assets, net	663,621		275,469
CLECO POWER | AFUDC
Regulatory Assets and Liabilities [Line Items]
Total regulatory liabilities	0		(4,218)
CLECO POWER | Corporate franchise tax, net
Regulatory Assets and Liabilities [Line Items]
Total regulatory liabilities	0		(763)
CLECO POWER | Deferred taxes, net
Regulatory Assets and Liabilities [Line Items]
Total regulatory liabilities	(95,544)		(175,584)
CLECO POWER | Acadia Unit 1 acquisition costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 1,913		2,019
REMAINING RECOVERY PERIOD (YRS.)	18 years
CLECO POWER | Accumulated deferred fuel
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 56,826		28,194
CLECO POWER | Affordability study
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 13,094	$ 13,600	0
REMAINING RECOVERY PERIOD (YRS.)	9 years 6 months
CLECO POWER | AFUDC equity gross-up
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 66,574		69,670
CLECO POWER | AMI deferred revenue requirement
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 2,045		2,591
REMAINING RECOVERY PERIOD (YRS.)	4 years
CLECO POWER | AROs (1)(7)
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 15,141		5,488
CLECO POWER | Bayou Vista to Segura deferred revenue requirement
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	1,392	$ 1,400	0
CLECO POWER | Acquisition costs or Transaction costs | Natural Gas Processing Plant
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 845		876
REMAINING RECOVERY PERIOD (YRS.)	27 years 6 months
CLECO POWER | COVID-19 executive order
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 2,953		2,953
CLECO POWER | Deferred storm restoration costs - Hurricane Delta
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	17,113		17,051
CLECO POWER | Deferred storm restoration costs - Hurricane Ida
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	37,617		0
CLECO POWER | Deferred storm restoration costs - Hurricane Laura
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	54,282		54,406
CLECO POWER | Deferred storm restoration costs - Hurricane Zeta
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	3,296		3,493
CLECO POWER | Deferred storm restoration costs - Winter Storms Uri & Viola
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	1,912		0
CLECO POWER | Accelerated depreciation | RODEMACHER UNIT 2
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	6,931		1,333
CLECO POWER | Emergency declarations
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	0		270
CLECO POWER | Energy efficiency
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 1,645		2,820
REMAINING RECOVERY PERIOD (YRS.)	1 year
CLECO POWER | Financing costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 6,826		7,184
CLECO POWER | Interest costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	3,459		3,708
CLECO POWER | Lignite Mine closure costs | Lignite Mine
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	136,980		0
CLECO POWER | Madison Unit 3 property taxes
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	8,362		0
CLECO POWER | Non-service cost of postretirement benefits
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	12,950		9,901
CLECO POWER | Other
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	11,224		4,229
CLECO POWER | Postretirement costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	117,773		165,437
CLECO POWER | Production operations and maintenance expenses
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	11,058		4,058
CLECO POWER | Production operations and maintenance expenses | DOLET HILLS POWER STATION
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 145,844		48,982
REMAINING RECOVERY PERIOD (YRS.)	3 years
CLECO POWER | St. Mary Clean Energy Center
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 6,089		3,479
REMAINING RECOVERY PERIOD (YRS.)	3 years 6 months
CLECO POWER | Training costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 5,929		6,085
REMAINING RECOVERY PERIOD (YRS.)	38 years
CLECO POWER | Tree trimming costs
Regulatory Assets and Liabilities [Line Items]
Total regulatory assets	$ 9,092		$ 11,807
REMAINING RECOVERY PERIOD (YRS.)	3 years 6 months