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Regulation and Rates - Narrative (Details)
9 Months Ended 24 Months Ended 48 Months Ended
Sep. 30, 2020
USD ($)
complaint
Jun. 30, 2020
Jun. 30, 2018
USD ($)
Jul. 15, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jul. 31, 2019
USD ($)
Jun. 30, 2017
USD ($)
Regulation and Rates [Line Items]              
Refund due to customers $ 9,852,000       $ 38,903,000    
Current regulatory liabilities $ 29,651,000       6,675,000    
FERC              
Regulation and Rates [Line Items]              
Number of complaints filed | complaint 2            
CLECO POWER              
Regulation and Rates [Line Items]              
Refund due to customers $ 9,038,000       38,241,000 $ 79,200,000  
Current regulatory liabilities 29,651,000       $ 6,675,000    
FRP, expiration period   2 years 4 years        
CLECO POWER | 2019 FRP Monitoring Report | Merger Commitments, cost savings              
Regulation and Rates [Line Items]              
Refund due to customers 1,500,000            
CLECO POWER | LPSC              
Regulation and Rates [Line Items]              
TCJA, bill credit per month       $ 7,000,000.0      
Bill credit per month related to change in federal statutory tax rate       2,500,000      
Bill credit related to unprotected excess ADIT       $ 4,400,000      
Estimated refund for the tax-related benefits from the TCJA 2,100,000            
CLECO POWER | LPSC | Merger Commitments, cost savings              
Regulation and Rates [Line Items]              
Regulatory liabilities $ 6,100,000            
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 | 2018 FRP Monitoring Report              
Regulation and Rates [Line Items]              
Refund due to customers     $ 2,300,000        
CLECO POWER | LPSC | 2017 FRP Monitoring Report, Cost of Service Savings              
Regulation and Rates [Line Items]              
Refund due to customers             $ 1,200,000
CLECO POWER | LPSC | Excess ADIT              
Regulation and Rates [Line Items]              
Regulatory liabilities $ 366,000,000.0            
Current regulatory liabilities 28,400,000            
CLECO POWER | FERC | Transmission return on equity              
Regulation and Rates [Line Items]              
Refund due to customers $ 600,000