Fair Value Accounting Instruments - Money Market Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 113,207	$ 46,279
Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	40,240	6,813
Current restricted cash and cash equivalents
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	15,818	23,548
Current restricted cash and cash equivalents | Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	15,818	23,548
Non-current restricted cash and cash equivalents
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	113,571	109,414
Non-current restricted cash and cash equivalents | Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	$ 113,548	$ 109,391