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Litigation, Other Commitments and Contingencies, and Disclosures about Guarantees, Litigation (Details)
$ in Thousands
1 Months Ended 24 Months Ended
Sep. 30, 2016
Jun. 30, 2016
petition
Sep. 30, 2015
USD ($)
Nov. 30, 2014
Nov. 30, 2013
Dec. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Feb. 28, 2017
USD ($)
Litigation [Abstract]                
Provision for rate refund           $ 4,206 $ 11,805  
Loss contingency, estimate of possible loss             4,600  
FERC | MISO Transmission Rates                
Litigation [Abstract]                
Public utilities, requested rate increase (decrease), percentage (in hundredths)       0.50%        
Gulf Coast Spinning start up costs                
Litigation [Abstract]                
Allegations by plaintiff, failure to perform     $ 6,500          
Gulf Coast Spinning construction of cotton spinning facility                
Litigation [Abstract]                
Allegations by plaintiff, failure to perform     $ 60,000          
Cleco Power                
Litigation [Abstract]                
Provision for rate refund           4,206 11,805  
Cleco Power | LPSC 2014-2015 Fuel Audit                
Litigation [Abstract]                
Fuel costs           $ 536,200    
Cleco Power | LPSC Nov2010-Dec2015 EAC audit                
Litigation [Abstract]                
Number of petitions filed with the U.S. Court of Appeals | petition   6            
Cleco Power | FERC | MISO Transmission Rates                
Litigation [Abstract]                
Public utilities, approved return on equity, percentage (In hundredths) 10.32%       12.38%      
Public utilities, proposed return on equity, percentage (in hundredths)   9.70%     6.68%      
Provision for rate refund             $ 2,100 $ 1,200