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Fair Value Accounting, Commodity Contracts (Details)
$ in Thousands, MWh in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 12, 2016
USD ($)
Dec. 31, 2016
USD ($)
MWh
MMBTU
Dec. 31, 2017
USD ($)
MWh
MMBTU
Dec. 31, 2016
USD ($)
MWh
MMBTU
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member]            
FTRs, at Fair Value, Net [Abstract]            
Commodity-related contracts, net   $ 7,683 $ 7,044 $ 7,683    
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Cleco Power [Member]            
FTRs [Abstract]            
Net gain (loss) on FTRs recognized in income     18,164 18,776 $ 23,085  
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Accumulated deferred fuel [Member] | Cleco Power [Member]            
FTRs [Abstract]            
Derivative, Unrealized Gain (Loss) On Derivative, Net     1,400 2,100 (1,500)  
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management asset [Member]            
FTRs, at Fair Value, Net [Abstract]            
FTRs in Energy risk management assets   7,884 7,396 7,884    
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management asset [Member] | Cleco Power [Member]            
FTRs, at Fair Value, Net [Abstract]            
FTRs in Energy risk management assets   7,884 7,396 7,884    
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management liabilities [Member]            
FTRs, at Fair Value, Net [Abstract]            
FTRs in Energy risk management liabilities   201 352 201    
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Energy risk management liabilities [Member] | Cleco Power [Member]            
FTRs, at Fair Value, Net [Abstract]            
FTRs in Energy risk management liabilities   $ 201 352 201    
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Power purchased for utility customers [Member] | Cleco Power [Member]            
FTRs [Abstract]            
Loss on FTRs recognized in income     (26,017) (20,702) (27,509)  
Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Electric operations [Member] | Cleco Power [Member]            
FTRs [Abstract]            
Gain on FTRs recognized in income     $ 44,181 $ 39,478 50,594  
ERROR in label resolution. | Cleco Power [Member]            
FTRs [Abstract]            
Number of open natural gas positions | MMBTU   0 0 0    
Cleco Power [Member]            
FTRs [Abstract]            
Number of FTRs Held (MWh) | MWh   14.4 9.0 14.4    
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member]            
FTRs [Abstract]            
Net gain (loss) on FTRs recognized in income $ 2,802       23,085  
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Accumulated deferred fuel [Member]            
FTRs [Abstract]            
Derivative, Unrealized Gain (Loss) On Derivative, Net 1,000         $ (1,500)
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Power purchased for utility customers [Member]            
FTRs [Abstract]            
Loss on FTRs recognized in income (5,761)       (27,509)  
Predecessor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Electric operations [Member]            
FTRs [Abstract]            
Gain on FTRs recognized in income $ 8,563       $ 50,594  
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member]            
FTRs [Abstract]            
Net gain (loss) on FTRs recognized in income   $ 15,974 $ 18,164      
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Accumulated deferred fuel [Member]            
FTRs [Abstract]            
Derivative, Unrealized Gain (Loss) On Derivative, Net   (3,100) 1,400      
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Power purchased for utility customers [Member]            
FTRs [Abstract]            
Loss on FTRs recognized in income   (14,941) (26,017)      
Successor [Member] | Price Risk Derivative [Member] | Derivatives Not Designated as Hedging Instrument [Member] | Electric operations [Member]            
FTRs [Abstract]            
Gain on FTRs recognized in income   $ 30,915 $ 44,181