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Fair Value Accounting, Derivatives and Hedging (Details)
$ in Thousands, MWh in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
MMBTU
MWh
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
MMBTU
MWh
Sep. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
MMBTU
MWh
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
FTRs, at Fair Value, Net [Abstract]                
Commodity-related contracts, net $ 14,075   $ 14,075     $ 9,949    
Energy risk management assets                
FTRs, at Fair Value, Net [Abstract]                
FTRs in Energy risk management asset 14,563   14,563     10,776    
Energy risk management liabilities                
FTRs, at Fair Value, Net [Abstract]                
FTRs in Energy risk management liability 488   488     $ 827    
Electric operations                
FTRs [Abstract]                
Gain (Loss) on FTRs Not Designated as Hedging Instruments Recognized in Income 8,988 $ 27,618 42,594 $ 52,946        
Power purchased for utility customers                
FTRs [Abstract]                
Gain (Loss) on FTRs Not Designated as Hedging Instruments Recognized in Income (5,687) (20,122) (22,337) (30,871)        
Derivatives Not Designated As Hedging Instruments [Member]                
FTRs [Abstract]                
Net gain (loss) on FTRs recognized in income $ 3,301 7,496 $ 20,257 22,075        
Cleco Power [Member]                
FTRs [Abstract]                
Number of FTRs Held (MWh) | MWh 13.1   13.1     8.9    
Cleco Power [Member] | Energy risk management assets                
FTRs, at Fair Value, Net [Abstract]                
FTRs in Energy risk management asset $ 14,600   $ 14,600     $ 10,800    
Cleco Power [Member] | Energy risk management liabilities                
FTRs, at Fair Value, Net [Abstract]                
FTRs in Energy risk management liability $ 500   $ 500     $ 800    
Energy Related Derivative [Member]                
FTRs [Abstract]                
Number of open natural gas positions | MMBTU 0   0     0    
Long-term program to provide gas price stability     5 years          
Energy Related Derivative [Member] | Cleco Power [Member]                
FTRs [Abstract]                
Number of open natural gas positions | MMBTU 0   0     0    
Fair Value, Inputs, Level 3 [Member] | Price Risk Derivative [Member]                
Derivatives, Fair Value [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 14,075 16,772 $ 14,075 16,772 $ 21,974 $ 9,949 $ 42,972 $ 8,638
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Deferred Fuel (719) (6,190) 1,053 (9,610)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 69 (1,299) 20,219 51,144        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements $ (7,249) $ (18,711) $ (17,146) $ (33,400)