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Affiliate Transactions - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Affiliate Transaction [Line Items]      
Accounts payable - affiliate $ 41,283 $ 33,780  
Distributions to member     $ 71,350
Contributions from member   384,900  
Cleco Holdings      
Affiliate Transaction [Line Items]      
Accounts payable - affiliate 41,300 33,800  
CLECO POWER      
Affiliate Transaction [Line Items]      
Accounts payable - affiliate 72,068 14,123  
Distributions to member   20,000 121,400
CLECO POWER | Oxbow      
Affiliate Transaction [Line Items]      
Due to Affiliate 300 200  
CLECO POWER | Support Group      
Affiliate Transaction [Line Items]      
Accounts payable - affiliate 14,355 13,890  
CLECO POWER | Support Group | Oxbow      
Affiliate Transaction [Line Items]      
Cost of mineral rights and land leases 17,400 4,400  
CLECO POWER | Cleco Cajun      
Affiliate Transaction [Line Items]      
Accounts payable - affiliate 0 39  
CLECO POWER | Cleco Holdings      
Affiliate Transaction [Line Items]      
Accounts payable - affiliate 57,713 194  
Distributions to member 0 20,000 121,400
Contributions from member 0 0 $ 0
Cleco Holdings | Cleco Holdings      
Affiliate Transaction [Line Items]      
Distributions to member $ 0 $ 0