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Intangible Assets and Liabilities - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 04, 2019
Mar. 31, 2019
Dec. 31, 2008
Dec. 31, 2016
Power supply agreements        
Finite-Lived Intangible Assets [Line Items]        
Intangible liabilities $ 7,800,000      
Intangible liabilities, residual value   $ 0    
Intangible liabilities, remaining life   6 years    
LTSA        
Finite-Lived Intangible Assets [Line Items]        
Intangible liabilities $ 24,100,000      
Intangible liabilities, remaining life 7 years      
Trade name        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life   20 years    
Intangible assets, residual value   $ 0    
Power supply agreements        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, residual value $ 0 $ 0    
Intangible assets $ 102,500,000      
Intangible assets, remaining life 6 years      
Power supply agreements | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life   4 years    
Power supply agreements | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life   16 years    
Cleco Katrina/Rita        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, residual value   $ 0    
Accumulated amortization       $ 0
Cleco Katrina/Rita | Cleco Katrina/Rita right to bill and collect storm recovery charges        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired     $ 177,500,000  
Cleco Katrina/Rita | Cleco Katrina/Rita right to bill and collect storm recovery charges | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life     12 years  
Cleco Katrina/Rita | Cleco Katrina/Rita right to bill and collect storm recovery charges | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible asset, useful life     15 years  
Cleco Katrina/Rita | Cleco Katrina/Rita right to bill and collect storm recovery charges from customers, net of financing costs        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired     $ 176,000,000  
Cleco Katrina/Rita | Financing costs        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired     $ 1,500,000