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Regulation and Rates (Details) - USD ($)
$ in Thousands
12 Months Ended 15 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Jun. 30, 2016
Apr. 28, 2016
Dec. 31, 2015
Cleco Power [Member]          
Regulation and Rates [Line Items]          
Accrued customer refund     $ 3,618   $ 2,696
Cleco Power [Member] | FERC [Member] | ROE reduction of transmission rates [Member]          
Regulation and Rates [Line Items]          
Accrued customer refund     3,100    
Cleco Power [Member] | LPSC [Member] | Monitoring report for the 12-month period ended June 30, 2015 [Member]          
Regulation and Rates [Line Items]          
Public Utilities, Requested Rate Increase (Decrease), Amount $ 200        
Public Utilities, Approved Rate Increase (Decrease), Amount $ 200        
Cleco Power [Member] | LPSC [Member] | FRP [Member]          
Regulation and Rates [Line Items]          
Target ROE allowed by FRP (in hundredths)   10.00%      
Percentage of retail earnings within range to be returned to customers (in hundredths)   60.00%      
ROE for customer credit, low range (in hundredths)   10.90%      
ROE for customer credit, high range (in hundredths)   11.75%      
Maximum [Member] | Cleco Power [Member] | LPSC [Member] | FRP [Member]          
Regulation and Rates [Line Items]          
Target ROE allowed by FRP (in hundredths)   10.90%      
Merger Commitments, rate credits [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       $ 136,000  
Merger Commitments, rate credits [Member] | Cleco Power [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       136,000  
Merger Commitments, economic development contribution [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       7,000  
Merger Commitments, economic development contribution [Member] | Cleco Power [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       7,000  
Merger Commitments, charitable contribution, over 5 years [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       6,000  
Merger Commitments, charitable contribution, over 5 years [Member] | Cleco Power [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       6,000  
Merger Commitments, economic development contribution, annually for 5 years [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       2,500  
Merger Commitments, economic development contribution, annually for 5 years [Member] | Cleco Power [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       2,500  
Merger Commitments, cost savings [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Merger Commitments       1,200  
Merger Commitments, cost savings [Member] | Cleco Power [Member] | LPSC [Member]          
Regulation and Rates [Line Items]          
Accrued customer refund     $ 300    
Merger Commitments       $ 1,200