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Debt (Details) - USD ($)
6 Months Ended
Mar. 02, 2020
Jun. 30, 2020
Jun. 30, 2019
Jul. 14, 2020
May 01, 2020
Sep. 11, 2019
Feb. 04, 2019
Debt [Line Items]              
Final principal payment   $ 11,055,000 $ 10,382,000        
Cleco Katrina/Rita’s storm recovery bonds              
Debt [Line Items]              
Final principal payment $ 11,100,000            
CLECO POWER              
Debt [Line Items]              
Final principal payment   $ 11,055,000 $ 10,382,000        
CLECO POWER | Line of credit              
Debt [Line Items]              
Debt instrument, interest rate   1.44%          
Borrowings outstanding   $ 150,000,000.0          
Maximum borrowing capacity   $ 300,000,000.0          
Commitment fees (as a percent)   0.15%          
CLECO POWER | Line of credit | LIBOR              
Debt [Line Items]              
Basis spread on variable rate (as a percent)   1.25%          
CLECO POWER | Line of credit | ABR              
Debt [Line Items]              
Basis spread on variable rate (as a percent)   0.25%          
CLECO POWER | 2008 series A GO Zone bonds              
Debt [Line Items]              
Aggregate principal amount         $ 50,000,000.0    
Debt instrument, interest rate         2.50%    
CLECO HOLDINGS | Line of credit              
Debt [Line Items]              
Debt instrument, interest rate   2.065%          
Borrowings outstanding   $ 88,000,000.0          
Maximum borrowing capacity   $ 175,000,000.0          
Commitment fees (as a percent)   0.30%          
CLECO HOLDINGS | Line of credit | LIBOR              
Debt [Line Items]              
Basis spread on variable rate (as a percent)   1.875%          
CLECO HOLDINGS | Line of credit | ABR              
Debt [Line Items]              
Basis spread on variable rate (as a percent)   0.875%          
CLECO HOLDINGS | Variable rate bank term loan | Term Loan              
Debt [Line Items]              
Long-term debt outstanding   $ 330,000,000.0          
Weighted average interest rate   2.539%          
CLECO HOLDINGS | Bank term loan 1 | Term Loan              
Debt [Line Items]              
Long-term debt outstanding   $ 300,000,000.0          
All-in interest rate   2.065%          
CLECO HOLDINGS | Bank term loan 1 | LIBOR | Term Loan              
Debt [Line Items]              
Basis spread on variable rate (as a percent)   1.875%          
CLECO HOLDINGS | Bank term loan 2 | Term Loan              
Debt [Line Items]              
Long-term debt outstanding   $ 30,000,000.0          
All-in interest rate   2.065%          
CLECO HOLDINGS | Bank term loan 2 | LIBOR | Term Loan              
Debt [Line Items]              
Basis spread on variable rate (as a percent)   1.875%          
CLECO HOLDINGS | 3.375% Senior notes | Senior Notes              
Debt [Line Items]              
Aggregate principal amount           $ 300,000,000.0  
Debt instrument, interest rate           3.375%  
CLECO HOLDINGS | 3.375% Senior notes | Senior Notes | Subsequent Event              
Debt [Line Items]              
Debt instrument, interest rate       3.375%      
CLECO HOLDINGS | Bridge loan agreement | Loans payable              
Debt [Line Items]              
Aggregate principal amount             $ 300,000,000.0
CLECO HOLDINGS | Bank term loan agreement | Loans payable              
Debt [Line Items]              
Aggregate principal amount             $ 100,000,000.0