Regulatory Assets and Liabilities - Narrative (Details)				12 Months Ended			24 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 22, 2022 USD ($)	Apr. 13, 2016 instrument	Dec. 31, 2023 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2011 USD ($) treasury_rate_lock	Dec. 31, 2021 storm hurricane	Dec. 31, 2022 USD ($)	Oct. 01, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 21, 2022 USD ($)	Jan. 31, 2022 USD ($)	Jul. 31, 2021	Jul. 01, 2021	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2016 USD ($)	Dec. 31, 2014	Dec. 31, 2010
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Estimated loss				$ 6,700,000
Regulatory asset				571,820,000				$ 564,123,000
Provision for rate refund				60,768,000				3,074,000
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				211,500,000				257,400,000
Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				587,661,000				598,100,000
Provision for rate refund				60,768,000				3,074,000
Regulatory liability				133,448,000				161,652,000
Cleco Power | Treasury Lock
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Number of treasury locks | treasury_rate_lock						2
Gain (loss) on sale of derivatives						$ 26,800,000
Cleco Power | Interest Rate Swap
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Gain (loss) on sale of derivatives					$ 3,300,000
Cleco Power | Storm reserves
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory liability				111,509,000				118,762,000
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 | Deferred storm restoration costs - Hurricane Ida
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Securitized storm restoration costs, amount withdrawn		$ 79,600,000
Cleco Power | Deferred storm restoration costs - Hurricane Ida | Storm reserves
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Decrease in regulatory liabilities	$ 10,300,000
Regulatory liability								15,500,000
Cleco Power | LPSC | Excess ADIT
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory liability				211,500,000				257,400,000
Cleco Power | Dolet Hills | LPSC
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Loss contingency accrual				58,700,000
Cleco Power | Dolet Hills | Minimum | LPSC
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Estimated loss												$ 58,700,000
Cleco Power | Dolet Hills | Maximum | LPSC
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Estimated loss												$ 228,000,000
Acadia Unit 1 acquisition costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																			30 years
Regulatory asset				1,701,000				1,807,000
Acadia Unit 1 acquisition costs | Cleco Power | Coughlin transaction costs
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																		35 years
Regulatory asset				784,000				815,000
Accumulated deferred fuel | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Decrease in regulatory assets				$ 46,300,000
Regulated total fuel cost, percentage				77.00%
Regulatory asset				$ 11,627,000				57,881,000
Affordability study | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period							10 years
Regulatory asset				10,337,000				11,715,000
AMI deferred revenue requirement | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																		11 years
Regulatory asset				954,000				1,499,000
COVID-19 Executive Order | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period															4 years
Regulatory asset				3,039,000				2,953,000
Production operations and maintenance expenses | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				7,002,000				10,443,000
Production operations and maintenance expenses | Cleco Power | Dolet Hills
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period												20 years
Energy efficiency | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																4 years
Regulatory asset				0				235,000
Financing costs
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				6,560,000				6,904,000
Financing costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				6,087,000				6,456,000
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				13,297,000				13,038,000
Northlake Transmission Agreement | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				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														4 years
Regulatory asset				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				2,000,000
Louisiana Tax Amendment | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				4,500,000
Postretirement costs
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				$ 9,448,000				11,436,000
Postretirement costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period				5 years
Regulatory asset				$ 64,399,000				47,317,000
Production O&M Expenses | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period				3 years
Regulatory asset				$ 0				2,400,000
Retail jurisdictional portion				34,900,000
Production O&M Expenses | Cleco Power | Maximum
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				25,000,000
St. Mary Clean Energy Center | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period														4 years
Regulatory asset				3,705,000				4,350,000
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	$ 10,400,000
St. Mary Clean Energy Center, Refund Liability | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset									$ 3,800,000	$ 3,800,000
Training costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory assets amortization period																			50 years
Regulatory asset				5,618,000				5,774,000
Tree trimming costs | Cleco Power
Schedule of Regulatory Assets and Liabilities, Net [Line Items]
Regulatory asset				$ 3,657,000				$ 6,377,000
Maximum amount of costs approved to defer																	$ 10,900,000