Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees - Narrative (Details)		1 Months Ended						12 Months Ended
	Apr. 13, 2016 claim	Dec. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Aug. 31, 2022 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 claim	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Feb. 02, 2024 USD ($)	Jan. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Feb. 29, 2020 USD ($)
Litigation [Line Items]
Estimated range of potential loss		$ 6,700,000						$ 6,700,000
Assets held as collateral for third parties								0
Unrecorded unconditional purchase obligation		159,893,000						159,893,000
Payments under long-term purchase obligations								79,200,000	$ 52,900,000	$ 52,000,000
Performance Guarantee
Litigation [Line Items]
Maximum amount of potential payment		42,400,000						42,400,000
Indemnification Agreement
Litigation [Line Items]
Maximum amount of potential payment		40,000,000						40,000,000
Indemnification Agreement, Including Fundamental Organizational Structure
Litigation [Line Items]
Maximum amount of potential payment		400,000,000						400,000,000
Cleco Power
Litigation [Line Items]
Assets held as collateral for third parties								0
Unrecorded unconditional purchase obligation		149,751,000						149,751,000
Payments under long-term purchase obligations								70,500,000	49,000,000	43,300,000
Decrease in ARO balance		(4,700,000)
Cleco Power | Indemnification Agreement
Litigation [Line Items]
Maximum amount of potential payment		40,000,000						40,000,000
Cleco Power | Indemnification Agreement, Including Fundamental Organizational Structure
Litigation [Line Items]
Maximum amount of potential payment		400,000,000						400,000,000
Cleco Power | LPSC
Litigation [Line Items]
Recovery of from energy efficiency programs									$ 8,500,000	$ 6,800,000
Cleco Power | LPSC | Dolet Hills
Litigation [Line Items]
Maximum estimated costs unrecoverable					$ 228,000,000
Loss contingency accrual		58,700,000						58,700,000
Cleco Power | LPSC | Dolet Hills | Minimum
Litigation [Line Items]
Estimated range of potential loss												$ 58,700,000
Cleco Power | LPSC | Dolet Hills | Minimum | Subsequent Event
Litigation [Line Items]
Estimated range of potential loss											$ 58,700,000
Cleco Power | LPSC | Dolet Hills | Maximum
Litigation [Line Items]
Estimated range of potential loss												$ 228,000,000
Cleco Power | LPSC | Dolet Hills | Maximum | Subsequent Event
Litigation [Line Items]
Estimated range of potential loss											$ 228,000,000
Cleco Power | Deferred taxes, net
Litigation [Line Items]
Capitalized storm restoration costs													$ 50,000,000
Cleco Power | LPSC 2020-2020 Fuel Audit
Litigation [Line Items]
Fuel expenses included in audit								1,100,000,000
Cleco Power | LPSC 2020-2022 Environmental Audit
Litigation [Line Items]
Fuel expenses included in audit			$ 38,300,000
Cleco Holdings
Litigation [Line Items]
Unrecorded unconditional purchase obligation		0						0
Cleco Cajun
Litigation [Line Items]
Decrease in ARO balance				$ 19,500,000
Indemnification assets, maximum environmental costs		25,000,000						25,000,000
Indemnification assets		$ 18,300,000						$ 18,300,000
Gulf Coast Spinning Start Up Costs
Litigation [Line Items]
Startup costs						$ 6,500,000
Gulf Coast Spinning Construction Of Cotton Spinning Facility
Litigation [Line Items]
Startup costs						$ 60,000,000
Gulf Coast Spinning Construction Of Cotton Spinning Facility | Diversified Lands LLC | Gulf Coast Spinning Company, LLC
Litigation [Line Items]
Loans payable														$ 2,000,000
Actions Filed In The 9th Judicial District Court | Alleged Breach of Fiduciary Duties
Litigation [Line Items]
Number of actions filed | claim	4
Actions Filed In The Civil District Court | Alleged Breach of Fiduciary Duties
Litigation [Line Items]
Number of actions filed | claim	3						3