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Regulation and Rates (Details) - USD ($)
1 Months Ended 12 Months Ended 36 Months Ended
Feb. 13, 2017
Sep. 29, 2016
Jun. 30, 2016
Nov. 30, 2013
Jun. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Oct. 31, 2016
Apr. 07, 2016
Regulation and Rates [Line Items]                  
Refund due to customers         $ 3,693,000 $ 3,693,000 $ 3,974,000    
Cleco Power                  
Regulation and Rates [Line Items]                  
Refund due to customers         3,693,000 3,693,000 3,974,000    
Amount collected in SSR payments from MISO         20,300,000 20,300,000      
LPSC | Merger Commitments, rate credits                  
Regulation and Rates [Line Items]                  
Merger Commitments                 $ 136,000,000
LPSC | Merger Commitments, rate credits | Cleco Power                  
Regulation and Rates [Line Items]                  
Merger Commitments                 136,000,000
Rate Credits issued to customers         127,600,000        
LPSC | Merger Commitments, economic development contribution                  
Regulation and Rates [Line Items]                  
Merger Commitments                 7,000,000
LPSC | Merger Commitments, economic development contribution | Cleco Power                  
Regulation and Rates [Line Items]                  
Merger Commitments                 7,000,000
One-time contribution paid to the LED             $ 7,000,000    
LPSC | Merger Commitments, economic development contribution, disbursed over 5 years                  
Regulation and Rates [Line Items]                  
Merger Commitments                 2,500,000
LPSC | Merger Commitments, economic development contribution, disbursed over 5 years | Cleco Power                  
Regulation and Rates [Line Items]                  
Merger Commitments                 2,500,000
LPSC | Merger Commitments, charitable contribution, disbursed over 5 years                  
Regulation and Rates [Line Items]                  
Merger Commitments                 6,000,000
LPSC | Merger Commitments, charitable contribution, disbursed over 5 years | Cleco Power                  
Regulation and Rates [Line Items]                  
Merger Commitments                 6,000,000
LPSC | Merger Commitments, cost savings                  
Regulation and Rates [Line Items]                  
Merger Commitments                 1,200,000
LPSC | Merger Commitments, cost savings | Cleco Power                  
Regulation and Rates [Line Items]                  
Refund due to customers         1,500,000 1,500,000      
Merger Commitments                 $ 1,200,000
MISO Transmission Rates | FERC                  
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% 6.68%          
MISO Transmission Rates | FERC | Cleco Power                  
Regulation and Rates [Line Items]                  
Customer Refundable Fees, Refund Payments $ 1,200,000                
ROE reduction of transmission rates | FERC | Cleco Power                  
Regulation and Rates [Line Items]                  
Refund due to customers         $ 2,000,000 $ 2,000,000      
FRP | LPSC | Cleco Power                  
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%      
FRP | LPSC | Maximum | Cleco Power                  
Regulation and Rates [Line Items]                  
Target ROE allowed by FRP (in hundredths)           10.90%      
FRP Monitoring report for the 12-month period ended June 30, 2016 | LPSC | Cleco Power                  
Regulation and Rates [Line Items]                  
Refund due to customers               $ 0  
Merger Commitment Monitoring report for the 12-month period ended June 30, 2016 | LPSC | Cleco Power                  
Regulation and Rates [Line Items]                  
Refund due to customers               $ 300,000