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Intangible Assets and Liabilities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 22, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Storm recover property          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible assets acquired $ 415,900,000        
Amortization of intangible assets   $ 0   $ 0  
Power supply agreements          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets   6,400,000 $ 6,400,000 12,800,000 $ 12,800,000
Intangible assets, residual value   0   $ 0  
Power supply agreements | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life       7 years  
Power supply agreements | Maximum          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life       19 years  
Cleco Cajun | LTSA          
Finite-Lived Intangible Assets [Line Items]          
Intangible liabilities, remaining life       7 years  
Cleco Cajun | Power supply agreements          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, residual value   $ 0   $ 0  
Cleco Cajun | Power supply agreements | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, remaining life       6 years  
Cleco Cajun | Power supply agreements | Maximum          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, remaining life       8 years