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Regulation and Rates - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 16, 2021
Sep. 30, 2021
USD ($)
complaint
Sep. 30, 2020
USD ($)
Jun. 30, 2021
Sep. 30, 2021
USD ($)
complaint
Sep. 30, 2020
USD ($)
Jul. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 13, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jul. 31, 2019
USD ($)
Regulation and Rates [Line Items]                      
Refund due to customers   $ 5,465     $ 5,465     $ 9,444      
Electric customer credits   691 $ 16,534   40,185 $ 34,126          
Current regulatory liabilities   46,003     46,003     23,509      
FRP                      
Regulation and Rates [Line Items]                      
Refund due to customers   1,236     1,236     1,786      
Cleco Katrina/Rita storm recovery charges                      
Regulation and Rates [Line Items]                      
Refund due to customers   $ 1,610     $ 1,610     1,617      
FERC                      
Regulation and Rates [Line Items]                      
Number of complaints filed | complaint   2     2            
CLECO POWER                      
Regulation and Rates [Line Items]                      
Refund due to customers   $ 5,465     $ 5,465     8,630     $ 79,200
Electric customer credits   691 $ 16,534   40,429 $ 33,974          
Regulatory liabilities   145,364     145,364     180,565      
Current regulatory liabilities   46,003     46,003     23,509      
CLECO POWER | FRP                      
Regulation and Rates [Line Items]                      
Refund due to customers   1,236     1,236     1,786   $ 1,200  
CLECO POWER | Cleco Katrina/Rita storm recovery charges                      
Regulation and Rates [Line Items]                      
Refund due to customers   1,610     1,610     $ 1,617      
CLECO POWER | LPSC                      
Regulation and Rates [Line Items]                      
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            
CLECO POWER | LPSC | Merger Commitments, cost savings                      
Regulation and Rates [Line Items]                      
Regulatory liabilities   $ 4,300     4,300            
CLECO POWER | LPSC | FRP                      
Regulation and Rates [Line Items]                      
Target ROE allowed by FRP   9.50%   10.00%              
Percentage of retail earnings within range to be returned to customers   60.00%   60.00%              
ROE for customer credit, low range   10.00%   10.90%              
ROE for customer credit, high range   10.50%   11.75%              
CLECO POWER | LPSC | FRP | Maximum                      
Regulation and Rates [Line Items]                      
Target ROE allowed by FRP   10.00%   10.90%              
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   $ 313,900     313,900            
Current regulatory liabilities   $ 39,500     39,500            
CLECO POWER | FERC                      
Regulation and Rates [Line Items]                      
Electric customer credits         $ 4,400