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Schedule I Financial Statements of Cleco Holdings (Parent Company Only) - Cash Distributions and Equity Contributions (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Condensed Financial Statements, Captions [Line Items]                      
Contribution from member/parent                 $ 384,900,000    
Distributions to member         $ 10,850,000 $ 20,600,000 $ 20,400,000 $ 19,500,000   $ 71,350,000 $ 84,065,000
CLECO POWER                      
Condensed Financial Statements, Captions [Line Items]                      
Distributions to member $ 20,000,000 $ 0 $ 0 $ 0 $ 0 $ 50,400,000 $ 43,000,000 $ 28,000,000 20,000,000 121,400,000 135,000,000
CLECO POWER | Cleco Holdings                      
Condensed Financial Statements, Captions [Line Items]                      
Contribution from member/parent                 0 0 0
Distributions to member                 $ 20,000,000 121,400,000 135,000,000
CLECO POWER | MAXIMUM                      
Condensed Financial Statements, Captions [Line Items]                      
Ratio of total indebtedness to total capitalization 0.65               0.65    
Cleco Holdings                      
Condensed Financial Statements, Captions [Line Items]                      
Cash distributions received from affiliates                 $ 225,000,000 121,842,000 149,010,000
Contribution to subsidiary                 962,170,000 1,250,000 0
Cleco Holdings | CLECO POWER                      
Condensed Financial Statements, Captions [Line Items]                      
Cash distributions received from affiliates                 20,000,000 121,400,000 135,000,000
Cleco Holdings | Cleco Cajun                      
Condensed Financial Statements, Captions [Line Items]                      
Cash distributions received from affiliates                 205,000,000 0 0
Cleco Holdings | Perryville                      
Condensed Financial Statements, Captions [Line Items]                      
Cash distributions received from affiliates                 0 225,000 6,850,000
Contribution to subsidiary                   1,800,000  
Cleco Holdings | Attala                      
Condensed Financial Statements, Captions [Line Items]                      
Cash distributions received from affiliates                 0 217,000 7,160,000
Contribution to subsidiary                   2,100,000  
Cleco Holdings | Cleco Holdings                      
Condensed Financial Statements, Captions [Line Items]                      
Contributions made to affiliates                 0   0
Contribution from member/parent                 384,900,000 0 0
Distributions to member                 0 71,400,000 $ 84,100,000
Cleco Holdings | Limited Liability Company                      
Condensed Financial Statements, Captions [Line Items]                      
Contributions made to affiliates                 $ 962,200,000 $ 1,300,000