Fair Value Accounting Instruments - Short-term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 65,894	$ 39,779
CLECO POWER
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Cash and cash equivalents	24,727	6,813
Restricted Cash And Cash Equivalents, Current
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	22,671	23,548
Restricted Cash And Cash Equivalents, Current | CLECO POWER
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	22,671	23,548
Restricted Cash And Cash Equivalents, Noncurrent
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	111,107	109,414
Restricted Cash And Cash Equivalents, Noncurrent | CLECO POWER
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restricted cash and cash equivalents	$ 111,085	$ 109,391