Debt (Details)		6 Months Ended
	May 21, 2021 USD ($)	Jun. 30, 2021 USD ($)
Line of credit | Revolving credit agreement
Debt [Line Items]
Debt, face amount	$ 175,000,000.0
Ratio of indebtedness	0.65
Commitment fees	0.275%
Potential additional interest	0.175%
Borrowings outstanding		$ 0
Term loan
Debt [Line Items]
Debt, face amount	$ 266,000,000.0
LIBOR | Line of credit | Revolving credit agreement
Debt [Line Items]
Basis spread on variable rate	1.625%
LIBOR | Term loan
Debt [Line Items]
Basis spread on variable rate	1.625%
ABR | Line of credit | Revolving credit agreement
Debt [Line Items]
Basis spread on variable rate	0.625%
ABR | Term loan
Debt [Line Items]
Basis spread on variable rate	0.625%
CLECO POWER | Line of credit | Revolving credit agreement
Debt [Line Items]
Debt, face amount	$ 300,000,000.0
Ratio of indebtedness	0.65
Commitment fees	0.15%
Potential additional interest	0.15%
Borrowings outstanding		$ 160,000,000.0
CLECO POWER | Term loan
Debt [Line Items]
Debt, face amount	$ 125,000,000.0
CLECO POWER | LIBOR | Line of credit | Revolving credit agreement
Debt [Line Items]
Basis spread on variable rate		1.25%
CLECO POWER | LIBOR | Term loan
Debt [Line Items]
Basis spread on variable rate	1.25%
CLECO POWER | ABR | Line of credit | Revolving credit agreement
Debt [Line Items]
Basis spread on variable rate		0.25%
CLECO POWER | ABR | Term loan
Debt [Line Items]
Basis spread on variable rate	0.25%