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Fair Value Accounting and Financial Instruments - Carrying Value and Estimated Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Deferred debt issuance costs not included in the carrying value of long-term debt $ 12,400 $ 13,200
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 7,500 7,900
CARRYING VALUE    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 3,480,631 3,482,405
CARRYING VALUE | CLECO POWER    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 1,820,331 1,820,254
FAIR VALUE    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt 3,536,846 3,752,220
FAIR VALUE | CLECO POWER    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,969,329 $ 2,085,944