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Fair Value Accounting, Commodity Contracts (Details)
$ in Thousands, MWh in Millions
3 Months Ended 6 Months Ended
Apr. 12, 2016
USD ($)
Jun. 30, 2016
USD ($)
MWh
MMBTU
Jun. 30, 2016
USD ($)
MWh
MMBTU
Apr. 12, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
MWh
MMBTU
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
MWh
MMBTU
Cleco Power [Member]                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
Number of FTRs Held (MWh) | MWh   18.3 18.3     18.3   8.4
FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Accumulated deferred fuel [Member]                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR Unrealized Gain (Loss) $ (200) $ 1,200   $ (1,000) $ 3,800   $ 2,100  
FTRs [Member] | Cleco Power [Member] | Derivatives Not Designated As Hedging Instruments [Member]                
Fair value of derivative instruments and their respective line items [Abstract]                
Commodity-related contracts, net   13,618 $ 13,618     $ 13,618   $ 7,398
Amount of gain(loss) recognized in income on derivatives [Abstract]                
Total     6,581   9,485 9,378 16,956  
FTRs [Member] | Cleco Power [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Accumulated deferred fuel [Member]                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR Unrealized Gain (Loss)     1,000   3,800 200 2,100  
FTRs [Member] | Cleco Power [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management asset [Member]                
Fair value of derivative instruments and their respective line items [Abstract]                
FTRs, Fair Value   13,989 13,989     13,989   7,673
FTRs [Member] | Cleco Power [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management liabilities                
Fair value of derivative instruments and their respective line items [Abstract]                
FTRs, Fair Value   $ 371 371     371   $ 275
FTRs [Member] | Cleco Power [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Electric operations                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR gain     6,922   18,098 15,442 33,606  
FTRs [Member] | Cleco Power [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Power purchased for utility customers                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR loss     $ (341)   (8,613) $ (6,064) (16,650)  
Energy Related Derivative [Member]                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
Number of open natural gas positions | MMBTU   0 0     0   0
Energy Related Derivative [Member] | Cleco Power [Member]                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
Number of open natural gas positions | MMBTU   0 0     0   0
Successor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member]                
Fair value of derivative instruments and their respective line items [Abstract]                
Commodity-related contracts, net   $ 13,618 $ 13,618     $ 13,618    
Amount of gain(loss) recognized in income on derivatives [Abstract]                
Total   6,576            
Successor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management asset [Member]                
Fair value of derivative instruments and their respective line items [Abstract]                
FTRs, Fair Value   13,989 13,989     13,989    
Successor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management liabilities                
Fair value of derivative instruments and their respective line items [Abstract]                
FTRs, Fair Value   371 $ 371     $ 371    
Successor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Electric operations                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR gain   6,879            
Successor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Power purchased for utility customers                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR loss   $ (303)            
Predecessor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member]                
Fair value of derivative instruments and their respective line items [Abstract]                
Commodity-related contracts, net               $ 7,398
Amount of gain(loss) recognized in income on derivatives [Abstract]                
Total 5     2,802 9,485   16,956  
Predecessor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management asset [Member]                
Fair value of derivative instruments and their respective line items [Abstract]                
FTRs, Fair Value               7,673
Predecessor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Energy risk management liabilities                
Fair value of derivative instruments and their respective line items [Abstract]                
FTRs, Fair Value               $ 275
Predecessor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Electric operations                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR gain 43     8,563 18,098   33,606  
Predecessor [Member] | FTRs [Member] | Derivatives Not Designated As Hedging Instruments [Member] | Power purchased for utility customers                
Amount of gain(loss) recognized in income on derivatives [Abstract]                
FTR loss $ (38)     $ (5,761) $ (8,613)   $ (16,650)