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Debt - Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 10, 2021
USD ($)
May 21, 2021
USD ($)
Feb. 04, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
facility
Dec. 31, 2020
USD ($)
May 15, 2020
Debt [Line Items]              
Short-term debt         $ 0 $ 75,000,000  
Long-term debt outstanding         3,480,000,000    
Long term debt And finance lease obligations current         93,500,000    
Long-term debt outstanding, due within one year         $ 93,455,000 66,682,000  
Number of revolving credit facilities | facility         2    
Cleco Cajun Transaction commitments              
Debt [Line Items]              
Long-term debt outstanding, due within one year         $ 67,700,000    
Loans Payable              
Debt [Line Items]              
Aggregate principal amount   $ 266,000,000          
Loans Payable | LIBOR              
Debt [Line Items]              
Basis spread on variable rate   1.625%          
Loans Payable | ABR              
Debt [Line Items]              
Basis spread on variable rate   0.625%          
NRG South Central              
Debt [Line Items]              
Repayments of long-term debt     $ 400,000,000 $ 400,000,000      
CLECO POWER              
Debt [Line Items]              
Short-term debt         0 75,000,000  
Long-term debt outstanding         1,830,000,000    
Long term debt And finance lease obligations current         25,800,000    
Long-term debt due within one year         25,000,000 0  
Long-term debt outstanding, due within one year         $ 25,755,000 682,000  
CLECO POWER | MAXIMUM              
Debt [Line Items]              
Debt to capital ratio         0.650   0.650
CLECO POWER | Line of Credit              
Debt [Line Items]              
Maximum borrowing capacity         $ 300,000,000    
Borrowings outstanding         $ 0    
CLECO POWER | Line of Credit | Revolving Credit Facility              
Debt [Line Items]              
Commitment fees         0.15%    
Interest rate, potential additional interest         0.125%    
Commitment fee, potential additional fee         0.025%    
CLECO POWER | Line of Credit | LIBOR | Revolving Credit Facility              
Debt [Line Items]              
Basis spread on variable rate         1.25%    
CLECO POWER | Line of Credit | ABR | Revolving Credit Facility              
Debt [Line Items]              
Basis spread on variable rate         0.25%    
CLECO POWER | Loans Payable              
Debt [Line Items]              
Aggregate principal amount   $ 125,000,000          
CLECO POWER | Loans Payable | LIBOR              
Debt [Line Items]              
Basis spread on variable rate   1.25%          
CLECO POWER | Loans Payable | ABR              
Debt [Line Items]              
Basis spread on variable rate   0.25%          
CLECO POWER | Senior Notes              
Debt [Line Items]              
Aggregate principal amount $ 325,000,000            
Redemption price, percentage 100.00%            
CLECO POWER | Senior Notes | LIBOR              
Debt [Line Items]              
Basis spread on variable rate 0.50%            
Cleco Holdings              
Debt [Line Items]              
Long-term debt due within one year         $ 67,700,000 $ 66,000,000  
Debt to capital ratio     0.65        
Cleco Holdings | MAXIMUM              
Debt [Line Items]              
Debt to capital ratio   0.650          
Cleco Holdings | Revolving Credit Facility              
Debt [Line Items]              
Maximum borrowing capacity     $ 175,000,000        
Cleco Holdings | Line of Credit              
Debt [Line Items]              
Maximum borrowing capacity         175,000,000    
Borrowings outstanding         0    
Line of credit facility, remaining borrowing capacity         $ 475,000,000    
Cleco Holdings | Line of Credit | Revolving Credit Facility              
Debt [Line Items]              
Commitment fees   0.275%          
Interest rate, potential additional interest   0.125%          
Commitment fee, potential additional fee   0.05%          
Cleco Holdings | Line of Credit | LIBOR | Revolving Credit Facility              
Debt [Line Items]              
Basis spread on variable rate         1.625%    
Cleco Holdings | Line of Credit | ABR | Revolving Credit Facility              
Debt [Line Items]              
Basis spread on variable rate         0.625%    
Line of Credit              
Debt [Line Items]              
Maximum borrowing capacity         $ 475,000,000    
Line of Credit | CLECO POWER              
Debt [Line Items]              
Maximum borrowing capacity         $ 300,000,000