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Regulation and Rates (Details) - USD ($)
1 Months Ended 3 Months Ended 27 Months Ended
Sep. 29, 2016
Jun. 30, 2016
Dec. 31, 2015
Nov. 30, 2013
Sep. 30, 2016
Sep. 30, 2016
Oct. 31, 2016
Apr. 07, 2016
Oct. 31, 2015
FERC [Member] | MISO Transmission Rates [Member]                  
Regulation and Rates [Line Items]                  
Target ROE allowed by FRP (in hundredths) 10.32%     12.38%          
Public Utilities, Proposed Return on Equity, Percentage (in hundredths)   9.70% 10.32% 6.68%          
Cleco Power [Member]                  
Regulation and Rates [Line Items]                  
Refund due to customers     $ 2,696,000   $ 3,201,000 $ 3,201,000      
Cleco Power [Member] | FERC [Member] | ROE reduction of transmission rates [Member]                  
Regulation and Rates [Line Items]                  
Refund due to customers         2,600,000 $ 2,600,000      
Cleco Power [Member] | LPSC [Member] | FRP Monitoring report for the 12-month period ended June 30, 2015 [Member]                  
Regulation and Rates [Line Items]                  
Refund due to customers                 $ 200,000
Cleco Power [Member] | LPSC [Member] | FRP [Member]                  
Regulation and Rates [Line Items]                  
Percentage of retail earnings exceeding range to be returned to customers (in hundredths)           100.00%      
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               $ 136,000,000  
Merger Commitments, rate credits [Member] | Cleco Power [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               136,000,000  
Rate Credits issued to customers         110,300,000        
Merger Commitments, economic development contribution [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               7,000,000  
Merger Commitments, economic development contribution [Member] | Cleco Power [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               7,000,000  
Merger Commitments, charitable contribution, disbursed over 5 years [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               6,000,000  
Merger Commitments, charitable contribution, disbursed over 5 years [Member] | Cleco Power [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               6,000,000  
Merger Commitments, economic development contribution, disbursed over 5 years [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               2,500,000  
Merger Commitments, economic development contribution, disbursed over 5 years [Member] | Cleco Power [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               2,500,000  
Merger Commitments, cost savings [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Merger Commitments               1,200,000  
Merger Commitments, cost savings [Member] | Cleco Power [Member] | LPSC [Member]                  
Regulation and Rates [Line Items]                  
Refund due to customers         $ 600,000 $ 600,000      
Merger Commitments               $ 1,200,000  
Subsequent Event [Member] | Cleco Power [Member] | LPSC [Member] | FRP Monitoring report for the 12-month period ended June 30, 2016 [Member]                  
Regulation and Rates [Line Items]                  
Refund due to customers             $ 0    
Subsequent Event [Member] | Cleco Power [Member] | LPSC [Member] | Merger Commitment Monitoring report for the 12-month period ended June 30, 2016 [Member]                  
Regulation and Rates [Line Items]                  
Refund due to customers             $ 300,000