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Regulation and Rates (Details) - USD ($)
1 Months Ended 6 Months Ended 30 Months Ended
Feb. 13, 2017
Sep. 29, 2016
Jun. 30, 2016
Dec. 31, 2015
Nov. 30, 2013
Dec. 31, 2016
Dec. 31, 2016
Oct. 31, 2016
Apr. 07, 2016
Oct. 31, 2015
Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Provision for rate refund       $ 2,696,000   $ 3,974,000 $ 3,974,000      
Federal Energy Regulatory Commission [Member] | Transmission return on equity [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Provision for rate refund           3,300,000 $ 3,300,000      
Federal Energy Regulatory Commission [Member] | MISO Transmission Rates [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Return on equity established by FERC (in hundredths)   10.32%     12.38%          
Return on equity recommended by ALJ (in hundredths)     9.70% 10.32% 6.68%          
Louisiana Public Service Commission [Member] | FRP extension [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Return on equity established by FERC (in hundredths)             10.00%      
Percentage of retail earnings within range to be returned to customers (in hundredths)             60.00%      
Return on equity for customer credit, low range (in hundredths)             10.90%      
Return on equity for customer credit, high range (in hundredths)             11.75%      
Louisiana Public Service Commission [Member] | 2015 FRP Monitoring report [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Provision for rate refund                   $ 200,000
Louisiana Public Service Commission [Member] | 2016 FRP Monitoring report [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Provision for rate refund               $ 0    
Louisiana Public Service Commission [Member] | 2016 Merger Commitment Monitoring report [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Provision for rate refund               $ 300,000    
Maximum [Member] | Louisiana Public Service Commission [Member] | FRP extension [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Return on equity established by FERC (in hundredths)             10.90%      
Subsequent Event [Member] | Federal Energy Regulatory Commission [Member] | MISO Transmission Rates [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Refunds submitted to MISO $ 1,200,000                  
Merger Commitments, rate credits [Member] | Louisiana Public Service Commission [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 $ 136,000,000  
Merger Commitments, rate credits [Member] | Louisiana Public Service Commission [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 136,000,000  
Rate Credits issued to customers           121,500,000        
Merger Commitments, economic development contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 2,500,000  
Merger Commitments, economic development contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 2,500,000  
Merger Commitments, economic development contribution [Member] | Louisiana Public Service Commission [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 7,000,000  
Merger Commitments, economic development contribution [Member] | Louisiana Public Service Commission [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 7,000,000  
Merger Commitments, charitable contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 6,000,000  
Merger Commitments, charitable contribution, disbursed over 5 years [Member] | Louisiana Public Service Commission [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 6,000,000  
Merger Commitments, cost savings [Member] | Louisiana Public Service Commission [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Merger Commitments                 1,200,000  
Merger Commitments, cost savings [Member] | Louisiana Public Service Commission [Member] | Cleco Power [Member]                    
Public Utilities, General Disclosures [Line Items]                    
Provision for rate refund           $ 900,000 $ 900,000      
Merger Commitments                 $ 1,200,000