Summary of Significant Accounting Policies - Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 20, 2023	Dec. 31, 2023	Dec. 31, 2022
Restricted Cash and Cash Equivalents [Abstract]
Current		$ 15,818	$ 23,549
Restricted cash - noncurrent		113,573	109,415
Total restricted cash and cash equivalents		129,391	132,964
Cleco Power’s storm restoration costs - Hurricane Ida
Restricted Cash and Cash Equivalents [Abstract]
Current		0	9,409
Restricted cash - noncurrent		0	6,086
Cleco Securitization I’s operating expenses and storm recovery bond issuance costs and debt service
Restricted Cash and Cash Equivalents [Abstract]
Current		15,818	14,140
Diversified Lands’ mitigation escrow
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent		24	23
Cleco Power’s future storm restoration costs
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent		113,549	103,306
CLECO POWER
Restricted Cash and Cash Equivalents [Abstract]
Current		15,818	23,549
Restricted cash - noncurrent		113,549	109,392
Total restricted cash and cash equivalents		129,367	132,941
CLECO POWER | Cleco Power’s storm restoration costs - Hurricane Ida
Restricted Cash and Cash Equivalents [Abstract]
Current		0	9,409
Restricted cash - noncurrent		0	6,086
Increase (decrease) in restricted cash and cash equivalents	$ (10,300)
CLECO POWER | Cleco Securitization I’s operating expenses and storm recovery bond issuance costs and debt service
Restricted Cash and Cash Equivalents [Abstract]
Current		15,818	14,140
CLECO POWER | Cleco Power’s future storm restoration costs
Restricted Cash and Cash Equivalents [Abstract]
Restricted cash - noncurrent		$ 113,549	$ 103,306