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Regulation and Rates (Details) - USD ($)
3 Months Ended
Sep. 30, 2019
Jul. 10, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Regulation and Rates [Line Items]            
Refund due to customers $ 50,777,000     $ 35,842,000    
CLECO POWER            
Regulation and Rates [Line Items]            
Estimated refund for the tax-related benefits from the TCJA 38,400,000          
Refund due to customers 49,403,000 $ 79,200,000   $ 35,842,000    
Payments received for capital expenditures subject to refund 2,800,000          
Accrual for related interest 3,000,000          
CLECO POWER | FERC            
Regulation and Rates [Line Items]            
Refund due to customers 3,000,000          
CLECO POWER | LPSC | Merger Commitments, cost savings            
Regulation and Rates [Line Items]            
Accrual for net capital refund for capital expenditures paid for by third parties 6,100,000          
CLECO POWER | FRP            
Regulation and Rates [Line Items]            
Refund due to customers $ 2,300,000          
CLECO POWER | FRP | LPSC            
Regulation and Rates [Line Items]            
Refund due to customers     $ 0      
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 | FRP | LPSC | Maximum            
Regulation and Rates [Line Items]            
Target ROE allowed by FRP 10.90%          
CLECO POWER | Transmission return on equity | FERC            
Regulation and Rates [Line Items]            
Refund due to customers $ 1,900,000          
CLECO POWER | 2017 FRP Monitoring Report, Cost of Service Savings | LPSC            
Regulation and Rates [Line Items]            
Refund due to customers           $ 1,200,000
CLECO POWER | 2018 FRP Monitoring Report, Earnings-Related Refunds | LPSC            
Regulation and Rates [Line Items]            
Refund due to customers         $ 0  
CLECO POWER | 2018 FRP Monitoring Report, Cost of Service Savings | LPSC            
Regulation and Rates [Line Items]            
Refund due to customers         1,200,000  
CLECO POWER | 2017 FRP Monitoring Report | LPSC            
Regulation and Rates [Line Items]            
Refund due to customers           $ 0
CLECO POWER | 2018 FRP Monitoring Report | LPSC            
Regulation and Rates [Line Items]            
Refund due to customers         $ 2,300,000  
Payments received for capital expenditures subject to refund $ 2,300,000          
CLECO POWER | 2019 FRP Monitoring Report | LPSC            
Regulation and Rates [Line Items]            
Refund due to customers     $ 1,200,000