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Debt - Narrative (Details)
1 Months Ended 7 Months Ended 12 Months Ended
Feb. 04, 2019
USD ($)
Jan. 31, 2019
USD ($)
Sep. 11, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt [Line Items]            
Short-term debt outstanding       $ 0 $ 0  
Long-term debt outstanding       3,190,000,000    
Long Term Debt And Finance Lease Obligations Current       125,986,000 21,128,000  
Repayments of long-term debt       390,571,000 19,193,000 $ 17,896,000
Cleco Cajun Transaction commitments            
Debt [Line Items]            
Long-term debt outstanding, due within one year       63,300,000    
Cleco Katrina/Rita’s storm recovery bonds            
Debt [Line Items]            
Long-term debt outstanding, due within one year       11,000,000    
CLECO POWER            
Debt [Line Items]            
Short-term debt outstanding       0 0  
Long-term debt outstanding       1,390,000,000    
Long Term Debt And Finance Lease Obligations Current       61,587,000 21,128,000  
Long-term debt outstanding, due within one year       61,600,000    
Repayments of long-term debt       20,571,000 $ 19,193,000 $ 17,896,000
CLECO POWER | Cleco Katrina/Rita’s storm recovery bonds            
Debt [Line Items]            
Long-term debt outstanding, due within one year       11,000,000    
Cleco Holdings            
Debt [Line Items]            
Debt term 3 years          
Debt to capital ratio 0.65          
Cleco Holdings | Bank Term Loan Agreement            
Debt [Line Items]            
Repayments of long-term debt     $ 100,000,000      
Cleco Holdings | Senior Notes 3.375% Due September 15, 2029            
Debt [Line Items]            
Aggregate principal amount     $ 300,000,000.0      
Interest rate     3.375%      
Cleco Holdings | Bridge Loan Agreement            
Debt [Line Items]            
Repayments of long-term debt     $ 300,000,000      
Unsecured Debt | GO Zone Bond, Maturing 2038            
Debt [Line Items]            
Aggregate principal amount       $ 50,000,000.0    
Loans Payable | Cleco Holdings            
Debt [Line Items]            
Debt term 3 years          
Debt to capital ratio 0.65          
Loans Payable | Cleco Holdings | Bank Term Loan Agreement            
Debt [Line Items]            
Aggregate principal amount $ 100,000,000.0          
Loans Payable | Cleco Holdings | Bridge Loan Agreement            
Debt [Line Items]            
Aggregate principal amount 300,000,000.0          
NRG South Central            
Debt [Line Items]            
Repayments of long-term debt $ 400,000,000 $ 400,000,000