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Regulation and Rates - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 21, 2022
Mar. 15, 2022
Jun. 16, 2021
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jun. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jul. 01, 2021
Aug. 31, 2020
Jul. 31, 2019
Regulation and Rates [Line Items]                            
Refund due to customers $ 13,256       $ 13,256 $ 13,256   $ 5,682   $ 13,256        
Electric customer credits           6,728 $ 691     6,992 $ 40,185      
Current regulatory liabilities 44,129       44,129 44,129   44,072   44,129        
Cleco Katrina/Rita storm recovery charges                            
Regulation and Rates [Line Items]                            
Refund due to customers 0       0 0   1,611   0        
FRP                            
Regulation and Rates [Line Items]                            
Refund due to customers 95       95 95   1,229   95        
St. Mary Clean Energy Center                            
Regulation and Rates [Line Items]                            
Refund due to customers 10,400       10,400 10,400   0   10,400        
CLECO POWER                            
Regulation and Rates [Line Items]                            
Refund due to customers 13,256       13,256 13,256   5,682   13,256       $ 79,200
Electric customer credits           6,728 $ 691     6,992 $ 40,429      
Regulatory assets 675,386       675,386 675,386   759,165   675,386        
Regulatory liabilities 167,101       167,101 167,101   95,544   167,101        
Current regulatory liabilities 44,129       44,129 44,129   44,072   44,129        
CLECO POWER | SSR, refund of cost sharing | Affiliated entity | MISO                            
Regulation and Rates [Line Items]                            
Transaction amount     $ 4,300                      
CLECO POWER | St. Mary Clean Energy Center                            
Regulation and Rates [Line Items]                            
Regulatory assets 8,607       8,607 8,607   6,089   8,607        
CLECO POWER | St. Mary Clean Energy Center, refund liability                            
Regulation and Rates [Line Items]                            
Regulatory assets 3,800       3,800 3,800       3,800        
CLECO POWER | Cleco Katrina/Rita storm recovery charges                            
Regulation and Rates [Line Items]                            
Customer refund payments, bill credits         1,600                  
Refund due to customers 0       0 0   1,611   0        
CLECO POWER | FRP                            
Regulation and Rates [Line Items]                            
Refund due to customers 95       95 95   1,229 $ 1,200 95        
CLECO POWER | St. Mary Clean Energy Center                            
Regulation and Rates [Line Items]                            
Refund due to customers 10,400       10,400 10,400   $ 0   10,400        
CLECO POWER | LPSC                            
Regulation and Rates [Line Items]                            
Electric customer credits 6,600 $ 6,600                        
TCJA, bill credit per month                         $ 7,000  
Bill credit related to unprotected excess ADIT                         4,400  
Bill credit per month related to change in federal statutory tax rate                         $ 2,600  
Estimated refund for the tax-related benefits from the TCJA 2,100       2,100 2,100       2,100        
CLECO POWER | LPSC | St. Mary Clean Energy Center                            
Regulation and Rates [Line Items]                            
Refund due to customers 10,400 10,400     10,400 10,400       10,400        
Disallowed recovery costs   15,000                        
Impairment of regulatory asset   13,800                        
CLECO POWER | LPSC | St. Mary Clean Energy Center, refund liability                            
Regulation and Rates [Line Items]                            
Regulatory assets 3,800 $ 3,800     3,800 3,800       $ 3,800        
CLECO POWER | LPSC | FRP                            
Regulation and Rates [Line Items]                            
Target ROE allowed by FRP               9.50% 10.00% 9.50%        
Percentage of retail earnings within range to be returned to customers               60.00% 60.00% 60.00%        
ROE for customer credit, low range               10.00% 10.90% 10.00%        
ROE for customer credit, high range               10.50% 11.75% 10.50%        
CLECO POWER | LPSC | FRP | Maximum                            
Regulation and Rates [Line Items]                            
Target ROE allowed by FRP               10.00% 10.90% 10.00%        
CLECO POWER | LPSC | Excess ADIT                            
Regulation and Rates [Line Items]                            
Bill credit related to unprotected excess ADIT                       $ 2,500    
Regulatory liability, amortization period       3 years                    
Regulatory liabilities 267,700       267,700 267,700       $ 267,700        
Current regulatory liabilities $ 44,100       $ 44,100 $ 44,100       $ 44,100