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Intangible Assets (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2008
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 160,798,000 $ 160,798,000  
Accumulated amortization (52,917,000) (45,948,000)  
Net intangible assets subject to amortization 107,881,000 114,850,000  
Cleco Katrina/Rita right to bill and collect storm recovery charges      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 70,594,000 70,594,000  
Power supply agreements      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 85,104,000 85,104,000  
Trade name      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount 5,100,000 5,100,000  
Cleco Power      
Finite-Lived Intangible Assets [Line Items]      
Accumulated amortization (140,321,000) (135,836,000) $ 0
Net intangible assets subject to amortization 37,216,000 41,701,000  
Cleco Power | Cleco Katrina/Rita right to bill and collect storm recovery charges      
Finite-Lived Intangible Assets [Line Items]      
Gross carrying amount $ 177,537,000 $ 177,537,000