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Regulation and Rates - Narrative (Details)
$ in Thousands
3 Months Ended 24 Months Ended 48 Months Ended
Mar. 31, 2021
USD ($)
complaint
Jun. 30, 2020
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Jul. 15, 2020
USD ($)
Jul. 31, 2019
USD ($)
Regulation and Rates [Line Items]            
Refund due to customers $ 8,933     $ 9,444    
Current regulatory liabilities $ 21,335     23,509    
FERC            
Regulation and Rates [Line Items]            
Number of complaints filed | complaint 2          
CLECO POWER            
Regulation and Rates [Line Items]            
FRP, expiration period   2 years 4 years      
Refund due to customers $ 8,119     8,630   $ 79,200
Regulatory liabilities 168,514     180,565    
Current regulatory liabilities 21,335     $ 23,509    
CLECO POWER | 2019 FRP Monitoring Report | Merger Commitments, cost savings            
Regulation and Rates [Line Items]            
Refund due to customers 2,100          
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          
CLECO POWER | LPSC | Merger Commitments, cost savings            
Regulation and Rates [Line Items]            
Regulatory liabilities $ 6,100          
CLECO POWER | LPSC | FRP            
Regulation and Rates [Line Items]            
Target ROE allowed by FRP 10.00%          
Percentage of retail earnings within range to be returned to customers (in hundredths) 60.00%          
ROE for customer credit, low range 10.90%          
ROE for customer credit, high range 11.75%          
CLECO POWER | LPSC | FRP | Maximum            
Regulation and Rates [Line Items]            
Target ROE allowed by FRP 10.90%          
CLECO POWER | LPSC | 2017 FRP Monitoring Report, Cost of Service Savings            
Regulation and Rates [Line Items]            
Refund due to customers     $ 1,200      
CLECO POWER | LPSC | Excess ADIT            
Regulation and Rates [Line Items]            
Regulatory liabilities $ 337,400          
Current regulatory liabilities 15,600          
CLECO POWER | FERC | Transmission return on equity            
Regulation and Rates [Line Items]            
Refund due to customers $ 600