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Regulation and Rates (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 07, 2016
Jun. 30, 2014
Dec. 31, 2019
Nov. 07, 2019
Jul. 10, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Public Utilities, General Disclosures [Line Items]                  
Provision for rate refund     $ 38,903,000       $ 35,842,000    
CLECO POWER                  
Public Utilities, General Disclosures [Line Items]                  
Estimated refund for the tax-related benefits from the TCJA     28,700,000            
Provision for rate refund     38,241,000   $ 79,200,000   $ 35,842,000    
Customer refund liability, accrued interest     2,400,000            
Merger commitments     3,900,000            
CLECO POWER | FERC                  
Public Utilities, General Disclosures [Line Items]                  
Provision for rate refund     3,500,000 $ 3,500,000          
CLECO POWER | FERC | Transmission return on equity                  
Public Utilities, General Disclosures [Line Items]                  
Provision for rate refund     1,000,000            
CLECO POWER | LPSC | FRP                  
Public Utilities, General Disclosures [Line Items]                  
Return on equity established by FERC   10.00%              
Percentage of retail earnings within range to be returned to customers   60.00%              
Return on equity for customer credit, low range   10.90%              
Return on equity for customer refund, high range   11.75%              
CLECO POWER | LPSC | 2017 FRP Monitoring report                  
Public Utilities, General Disclosures [Line Items]                  
Provision for rate refund                 $ 0
CLECO POWER | LPSC | 2018 FRP Monitoring report                  
Public Utilities, General Disclosures [Line Items]                  
Provision for rate refund               $ 2,300,000  
CLECO POWER | MAXIMUM | LPSC | FRP                  
Public Utilities, General Disclosures [Line Items]                  
Return on equity established by FERC   10.90%              
CLECO POWER | Rate credits | LPSC                  
Public Utilities, General Disclosures [Line Items]                  
Merger commitments $ 136,000,000                
Rate credits issued to customers     135,900,000            
CLECO POWER | Contributions for economic development | LPSC                  
Public Utilities, General Disclosures [Line Items]                  
Merger commitments $ 2,500,000                
Disbursement period 5 years                
CLECO POWER | Economic development contribution | LPSC                  
Public Utilities, General Disclosures [Line Items]                  
Merger commitments $ 7,000,000                
CLECO POWER | Charitable contributions to be disbursed over five years | LPSC                  
Public Utilities, General Disclosures [Line Items]                  
Merger commitments $ 6,000,000                
Disbursement period 5 years                
CLECO POWER | Cost savings | 2017 FRP Monitoring report                  
Public Utilities, General Disclosures [Line Items]                  
Provision for rate refund     1,900,000            
CLECO POWER | Cost savings | 2019 FRP Monitoring Report [Member]                  
Public Utilities, General Disclosures [Line Items]                  
Provision for rate refund           $ 1,200,000      
CLECO POWER | Cost savings | LPSC                  
Public Utilities, General Disclosures [Line Items]                  
Refunds submitted to MISO     $ 6,100,000