Derivative Instruments - Schedule of Derivative Instruments as Recorded in Consolidated Balance Sheets (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
FTRs
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Energy risk management assets	Energy risk management assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Energy risk management liabilities	Energy risk management liabilities
FTRs | CLECO POWER
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Energy risk management assets	Energy risk management assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Energy risk management liabilities	Energy risk management liabilities
Natural gas derivatives
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Energy risk management liabilities	Energy risk management liabilities
Natural gas derivatives | CLECO POWER
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Energy risk management liabilities	Energy risk management liabilities
Not Designated as Hedging Instrument
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Net asset (liability) on the balance sheet	$ 31,972,000	$ 100,942,000
GROSS ASSET (LIABILITY)
Derivative asset (liability), net		107,442,000
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative, collateral	0	(6,500,000)
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET
Collateral, assets		(53,000,000)
NET AMOUNT
Net amount		47,942,000
Not Designated as Hedging Instrument | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative asset (liability), net	371,000	(2,294,000)
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative, collateral	0
Not Designated as Hedging Instrument | FTRs
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	4,814,000	2,570,000
Derivative liability	(671,000)	(294,000)
GROSS ASSET (LIABILITY)
Derivative asset		2,570,000
Derivative liability		(294,000)
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, collateral		0
Derivative liability, collateral		0
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET
Collateral, assets		0
Collateral, liability		0
NET AMOUNT
Derivative asset, net		2,570,000
Derivative liability, net		(294,000)
Not Designated as Hedging Instrument | FTRs | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative asset	4,814,000	2,570,000
Derivative liability	(671,000)	(294,000)
Not Designated as Hedging Instrument | Natural gas derivatives
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative liability	(4,550,000)	(6,980,000)
GROSS ASSET (LIABILITY)
Derivative liability		(6,980,000)
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative liability, collateral		0
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET
Collateral, liability		0
NET AMOUNT
Derivative liability, net		(6,980,000)
Not Designated as Hedging Instrument | Natural gas derivatives | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative liability	(3,938,000)	(4,570,000)
Not Designated as Hedging Instrument | Natural gas derivatives | Energy risk management assets, current
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	22,293,000	46,751,000
GROSS ASSET (LIABILITY)
Derivative asset		53,251,000
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, collateral		(6,500,000)
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET
Collateral, assets		(32,578,000)
NET AMOUNT
Derivative asset, net		14,173,000
Not Designated as Hedging Instrument | Natural gas derivatives | Energy risk management assets, current | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative asset	85,000	0
Not Designated as Hedging Instrument | Natural gas derivatives | Energy risk management assets, noncurrent
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	10,086,000	58,895,000
GROSS ASSET (LIABILITY)
Derivative asset		58,895,000
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, collateral		0
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET
Collateral, assets		(20,422,000)
NET AMOUNT
Derivative asset, net		38,473,000
Not Designated as Hedging Instrument | Natural gas derivatives | Energy risk management assets, noncurrent | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative asset	$ 81,000	$ 0