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Fair Value Accounting, Commodity Contracts (Details)
$ in Thousands, MWh in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
MMBTU
MWh
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
MMBTU
MWh
Cleco Power [Member]      
FTRs [Abstract]      
Number of FTRs Held (MWh) | MWh 3.3   8.4
FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management assets      
FTRs, at Fair Value, Net [Abstract]      
FTRs, Fair Value $ 2,252   $ 7,673
FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management liabilities      
FTRs, at Fair Value, Net [Abstract]      
FTRs, Fair Value 386   275
FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management asset and liabilities [Member]      
FTRs, at Fair Value, Net [Abstract]      
Commodity-related contracts, net 1,866   $ 7,398
FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Electric operations      
FTRs [Abstract]      
FTR gain 8,520 $ 15,508  
FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Power purchased for utility customers      
FTRs [Abstract]      
FTR loss (5,723) (8,037)  
FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Electric operations and Power purchased for utility customers [Member]      
FTRs [Abstract]      
Net gain (loss) on FTRs recognized in income $ 2,797 7,471  
Energy Related Derivative [Member]      
FTRs [Abstract]      
Number of open natural gas positions | MMBTU 0   0
Energy Related Derivative [Member] | Cleco Power [Member]      
FTRs [Abstract]      
Number of open natural gas positions | MMBTU 0   0
FTRs [Member] | Cleco Power [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management assets      
FTRs [Abstract]      
FTR Unrealized Gain (Loss) $ (800) $ (1,700)