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Fair Value Accounting Instruments - Carrying Value and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred debt issuance costs not included in the carrying value of long-term debt $ 11,600 $ 14,200
CARRYING VALUE    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 2,922,003 3,400,293
FAIR VALUE    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 2,716,251 3,177,654
CLECO POWER    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred debt issuance costs not included in the carrying value of long-term debt 10,100 11,500
CLECO POWER | CARRYING VALUE    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,822,061 1,886,248
CLECO POWER | FAIR VALUE    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,800,633 $ 1,867,559