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Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Variable Interest Entity [Line Items]        
Equity investment in investee $ 13,072 $ 13,072   $ 17,072
Cash dividends   4,000 $ 500  
CLECO POWER        
Variable Interest Entity [Line Items]        
Equity investment in investee 13,072 13,072   $ 17,072
Cash dividends $ 4,000 $ 4,000 $ 500  
CLECO POWER | Oxbow        
Variable Interest Entity [Line Items]        
Ownership percentage by Cleco Power (in hundredths)   50.00%    
Ownership percentage by other parties (in hundredths)   50.00%