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Debt - Credit Facilities (Details)
12 Months Ended
Feb. 05, 2019
USD ($)
Feb. 04, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit          
Line of Credit Facility [Line Items]          
Unrestricted member's equity     $ 655,000,000    
Cleco Holdings | Line of Credit          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity     $ 100,000,000    
Commitment fees     0.275%    
Higher fees if downgraded     0.075%    
Additional interest if downgraded     0.50%    
Cleco Holdings | Line of Credit | MAXIMUM          
Line of Credit Facility [Line Items]          
Ratio of total indebtedness to total capitalization     0.65    
Cleco Holdings | Line of Credit | ABR          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.75%    
Cleco Holdings | Line of Credit | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.75%    
CLECO POWER          
Line of Credit Facility [Line Items]          
Draws on credit facilities     $ 0 $ 106,000,000 $ 15,000,000
Payments on credit facilities     $ 0 $ 106,000,000 $ 15,000,000
CLECO POWER | MAXIMUM          
Line of Credit Facility [Line Items]          
Ratio of total indebtedness to total capitalization     0.65    
CLECO POWER | Line of Credit          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity     $ 300,000,000    
Commitment fees     0.125%    
Higher fees if downgraded     0.05%    
Additional interest if downgraded     0.125%    
Unrestricted member's equity     $ 831,900,000    
CLECO POWER | Line of Credit | MAXIMUM          
Line of Credit Facility [Line Items]          
Ratio of total indebtedness to total capitalization     0.65    
CLECO POWER | Line of Credit | ABR          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.125%    
CLECO POWER | Line of Credit | LIBOR          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.125%    
Subsequent Event | Cleco Holdings          
Line of Credit Facility [Line Items]          
Ratio of total indebtedness to total capitalization   0.65      
Subsequent Event | Cleco Holdings | Line of Credit          
Line of Credit Facility [Line Items]          
Draws on credit facilities   $ 75,000,000.0      
Payments on credit facilities $ 75,000,000