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Debt - Narrative (Details)
1 Months Ended 7 Months Ended 12 Months Ended
Aug. 28, 2020
USD ($)
Feb. 04, 2019
USD ($)
Jan. 31, 2019
USD ($)
Sep. 11, 2019
USD ($)
Dec. 31, 2020
USD ($)
facility
May 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt [Line Items]              
Short-term debt         $ 75,000,000   $ 0
Long-term debt outstanding         3,230,000,000    
Long term debt And finance lease obligations current         66,700,000    
Long-term debt         400,000,000    
Long-term debt outstanding, due within one year         $ 66,682,000   125,986,000
Line Of Credit, Number Of Revolving Credit Facilities | facility         2    
Cleco Cajun Transaction commitments              
Debt [Line Items]              
Long-term debt outstanding, due within one year         $ 66,000,000.0    
NRG South Central              
Debt [Line Items]              
Repayments of long-term debt   $ 400,000,000.0 $ 400,000,000.0        
CLECO POWER              
Debt [Line Items]              
Short-term debt         75,000,000   0
Long-term debt outstanding         1,500,000,000    
Long term debt And finance lease obligations current         700,000    
Long-term debt outstanding, due within one year         $ 682,000   $ 61,587,000
CLECO POWER | Series A GO Zone bonds, 2.50%, due 2038, mandatory tender in 2025              
Debt [Line Items]              
Interest rate         2.50% 2.50%  
Aggregate principal amount           $ 50,000,000.0  
CLECO POWER | Secured Debt | Variable Rate Bank Term Loan              
Debt [Line Items]              
Interest rate 1.40%            
Long-term debt $ 125,000,000.0            
CLECO POWER | Secured Debt | Variable Rate Bank Term Loan | LIBOR              
Debt [Line Items]              
Basis spread on variable rate 0.25%            
CLECO POWER | Secured Debt | Variable Rate Bank Term Loan | ABR              
Debt [Line Items]              
Basis spread on variable rate 1.25%            
CLECO POWER | Line of Credit              
Debt [Line Items]              
Maximum borrowing capacity         $ 300,000,000.0    
CLECO POWER | Line of Credit | LIBOR              
Debt [Line Items]              
Basis spread on variable rate         1.25%    
CLECO POWER | Line of Credit | ABR              
Debt [Line Items]              
Basis spread on variable rate         0.25%    
Cleco Holdings | Senior Notes 3.375% Due September 15, 2029              
Debt [Line Items]              
Interest rate       3.375%      
Aggregate principal amount       $ 300,000,000.0      
Cleco Holdings | Bridge Loan Agreement              
Debt [Line Items]              
Repayments of long-term debt       300,000,000.0      
Cleco Holdings | Bank Term Loan Agreement              
Debt [Line Items]              
Repayments of long-term debt       $ 100,000,000.0      
Cleco Holdings | Line of Credit              
Debt [Line Items]              
Maximum borrowing capacity         $ 175,000,000.0    
Cleco Holdings | Line of Credit | LIBOR              
Debt [Line Items]              
Basis spread on variable rate         1.875%    
Cleco Holdings | Line of Credit | ABR              
Debt [Line Items]              
Basis spread on variable rate         0.875%    
Line of Credit              
Debt [Line Items]              
Maximum borrowing capacity         $ 475,000,000.0    
Interest rate         1.40%    
Line of Credit | CLECO POWER              
Debt [Line Items]              
Maximum borrowing capacity         $ 300,000,000.0    
Interest rate         1.40%