Fair Value Accounting Instruments - Money Market Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 162,282	$ 21,562
Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	154,082	15,263
Current restricted cash and cash equivalents
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	33,702	15,918
Current restricted cash and cash equivalents | Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	33,702	15,918
Non-current restricted cash and cash equivalents
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	138,369	116,492
Non-current restricted cash and cash equivalents | Cleco Power
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	$ 138,344	$ 116,467