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Leases - Operating Lease (Details)
Dec. 31, 2020
Dec. 31, 2020
municipality
Dec. 31, 2020
nonmunicipal_public_body
Dec. 31, 2020
railcar
Dec. 31, 2020
towboat
Jul. 09, 2019
CLECO POWER            
Operating Leased Assets [Line Items]            
Operating lease, number of lessors   2 1      
CLECO POWER | Railroad Transportation Equipment            
Operating Leased Assets [Line Items]            
Lessee, operating lease, number of leased assets       113    
CLECO POWER | Maritime Equipment            
Operating Leased Assets [Line Items]            
Lessee, operating lease, renewal term 5 years          
Term of operating lease (in years) 10 years          
Lessee, operating lease, number of leased assets | towboat         3  
Cleco Cajun | Railroad Transportation Equipment            
Operating Leased Assets [Line Items]            
Lessee, operating lease, renewal term 1 month          
Term of operating lease (in years) 12 months          
Lessee, operating lease, number of leased assets       135    
Municipality One | CLECO POWER | Utility System            
Operating Leased Assets [Line Items]            
Lessee, operating lease, renewal term           10 years
Municipality Two | CLECO POWER | Utility System            
Operating Leased Assets [Line Items]            
Term of operating lease (in years) 10 years          
Non-Municipal Public Body | CLECO POWER | Utility System            
Operating Leased Assets [Line Items]            
Term of operating lease (in years) 27 years