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Regulation and Rates (Details)
1 Months Ended 3 Months Ended 48 Months Ended
Feb. 28, 2015
Mar. 31, 2019
USD ($)
claim
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Regulation and Rates [Line Items]          
Estimated refund for the tax-related benefits from the TCJA   $ 39,300,000      
Refund due to customers   44,002,000   $ 35,842,000  
CLECO POWER          
Regulation and Rates [Line Items]          
Refund due to customers   44,002,000   $ 35,842,000  
Payments received for capital expenditures subject to refund   2,100,000      
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   6,000,000      
CLECO POWER | Transmission return on equity | FERC          
Regulation and Rates [Line Items]          
Refund due to customers   1,900,000      
CLECO POWER | MISO Transmission Rates | FERC          
Regulation and Rates [Line Items]          
Refund due to customers   $ 1,900,000      
Loss contingency, new claims filed, number | claim   2      
Target ROE allowed by FRP 12.38%        
CLECO POWER | FRP | LPSC          
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 | FRP | LPSC | Maximum          
Regulation and Rates [Line Items]          
Target ROE allowed by FRP     10.90%    
CLECO POWER | 2017 FRP Monitoring Report | LPSC          
Regulation and Rates [Line Items]          
Refund due to customers         $ 0
CLECO POWER | 2017 FRP Monitoring Report, Cost of Service Savings | LPSC          
Regulation and Rates [Line Items]          
Refund due to customers   $ 1,200,000     $ 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