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Debt, Credit Facilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Apr. 13, 2016
Apr. 12, 2016
Cleco Holdings [Member]      
Line of Credit Facility [Line Items]      
Long-term line of credit $ 0.0    
Line of credit facility, maximum borrowing capacity $ 100.0 $ 100.0 $ 250.0
Commitment fees (in hundredths) 0.275%    
Cleco Power [Member]      
Line of Credit Facility [Line Items]      
Long-term line of credit $ 0.0    
Line of credit facility, maximum borrowing capacity $ 300.0 300.0 $ 300.0
Letters of credit outstanding, amount   $ 2.0  
Commitment fees (in hundredths) 0.125%    
LIBOR [Member] | Cleco Holdings [Member] | Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility, basis spread on variable rate (in hundredths) 1.75%    
LIBOR [Member] | Cleco Power [Member] | Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility, basis spread on variable rate (in hundredths) 1.125%    
ABR [Member] | Cleco Holdings [Member] | Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility, basis spread on variable rate (in hundredths) 0.75%    
ABR [Member] | Cleco Power [Member] | Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Credit facility, basis spread on variable rate (in hundredths) 0.125%