Regulatory Assets and Liabilities - Narrative (Details)							1 Months Ended		12 Months Ended					24 Months Ended
	Jul. 01, 2024 USD ($)	Jun. 30, 2024 USD ($)	May 17, 2024 USD ($)	Apr. 19, 2024 USD ($)	Sep. 30, 2023 USD ($)	Apr. 13, 2016 instrument	Sep. 30, 2022 USD ($)	Jul. 31, 2022 MW	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2011 USD ($) treasury_rate_lock	Dec. 31, 2021 hurricane storm	Nov. 20, 2024	Nov. 01, 2024 USD ($)	Jul. 31, 2021	Jul. 01, 2021	Dec. 31, 2016 USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2010
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Provision for rate refund									$ 20,510,000	$ 60,768,000
Electric customer credits									1,300,000	58,700,000	$ 0
Treasury Lock
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Number of instruments settled | instrument						2
LPSC | Excess ADIT
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory liability									189,600,000	211,500,000
Dolet Hills | LPSC
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Decrease in regulatory assets			$ 40,000,000.0
Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									498,883,000	587,661,000,000
Environmental resource credits | MW								240
Provision for rate refund									20,510,000	60,768,000
Electric customer credits									1,300,000	58,700,000	$ 0
Regulatory liability									86,005,000	133,448,000,000
Increase (decrease) in regulatory liabilities	$ (64,900,000)
Cleco Power | Treasury Lock
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Number of treasury locks | treasury_rate_lock													2
Loss on sale of derivatives													$ 26,800,000
Cleco Power | Interest Rate Swap
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Loss on sale of derivatives												$ 3,300,000
Cleco Power | Storm reserves
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory liability, remaining cost																$ 400,000
Regulatory liability									76,178,000	111,509,000,000
Storm reserve balance									76,200,000	111,500,000
Accumulated restoration costs									43,300,000	2,500,000
Cleco Power | Residential revenue decoupling
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory liability									3,000,000	0
Increase (decrease) in regulatory liabilities	$ 3,000,000
Cleco Power | Hurricanes
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Number of hurricanes | hurricane														4
Number of severe winter storms | storm														2
Cleco Power | Hurricane Ida | Storm reserves
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Decrease in regulatory liabilities					$ 10,300,000
Cleco Power | LPSC | Excess ADIT
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory liability									189,600,000	211,500,000
Cleco Power | Dolet Hills | LPSC
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Decrease in regulatory assets		$ 12,300,000	$ 40,000,000.0	$ 40,000,000.0
Acadia Unit 1 acquisition costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																						30 years
Regulatory asset									1,596,000	1,701,000,000
Accumulated deferred fuel | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Decrease in regulatory assets									$ 11,200,000
Regulated total fuel cost, percentage									89.00%
Regulatory asset									$ 457,000	11,627,000,000
Affordability study | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period														10 years
Regulatory asset									8,959,000	10,337,000,000
AMI deferred revenue requirement | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																				11 years
Regulatory asset									409,000	954,000,000
Coughlin transaction costs | Cleco Power | Coughlin transaction costs
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																					35 years
Regulatory asset									753,000	784,000,000
Production operations and maintenance expenses | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									4,939,000	$ 7,002,000,000
Production operations and maintenance expenses | Cleco Power | Dolet Hills | LPSC
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period										25 years	20 years
Dolet Hills carrying charge | Cleco Power | Dolet Hills
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period															1 year
Regulatory asset									4,729,000	$ 0
Financing costs
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									6,217,000	6,560,000,000
Financing costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									5,717,000	6,087,000,000
Financing costs | Cleco Power | Treasury Lock
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset													$ 7,400,000
Financing costs | Cleco Power | Interest Rate Swap
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset												$ 2,900,000
Madison Unit 3 property taxes | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																	12 months
Regulatory asset									14,196,000	13,297,000,000
Postretirement costs
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									$ 7,461,000	9,448,000,000
Postretirement costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period									6 years
Regulatory asset									$ 58,089,000	64,399,000,000
Production O&M Expenses | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period									3 years
Regulatory asset									$ 2,000,000	0
Retail jurisdictional portion									29,700,000
Production O&M Expenses | Cleco Power | Maximum
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									25,000,000.0
St. Mary Clean Energy Center | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																		4 years
Regulatory asset									870,000	3,705,000,000
St. Mary Clean Energy Center | Cleco Power | LPSC
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset							$ 3,800,000
Provision for rate refund							10,400,000
Electric customer credits							$ 6,600,000
Training costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																						50 years
Regulatory asset									5,462,000	5,618,000,000
Tree trimming costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									943,000	3,657,000,000
Maximum amount of costs approved to defer																			$ 11,000,000.0
Northlake Transmission Agreement | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									2,500,000	1,000,000
Other Deferred Costs, Primarily Base Rate Case | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																		3 years
Regulatory asset									4,500,000	2,900,000
Coughlin Pipeline Project, Deferred Revenue | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																		4 years
Regulatory asset									700,000	2,000,000
Louisiana Tax Amendment | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset		$ 5,500,000								$ 4,500,000
Industrial Tax Exemption Program | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									600,000
Transmission And Distribution System | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									$ 4,600,000