Fair Value Accounting and Financial Instruments - Fair Value of Derivative Instruments as Recorded in Condensed Consolidated Balance Sheets (Details) - DERIVATIVES NOT DESIGNATED AS HEDGING INSTRUMENTS - USD ($)	Mar. 31, 2022	Dec. 31, 2021
GROSS ASSET (LIABILITY)
Commodity-related contracts, net	$ 193,255,000	$ 93,607,000
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative, collateral	(26,300,000)	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Net asset (liability) on the balance sheet	166,955,000	93,607,000
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	(82,000,000)	(15,000,000)
NET AMOUNT
Net amount	84,955,000	78,607,000
Price risk derivatives | CLECO POWER
GROSS ASSET (LIABILITY)
Commodity-related contracts, net	567,000	4,918,000
Price risk derivatives | Energy risk management assets, current
GROSS ASSET (LIABILITY)
Derivative asset	1,114,000	6,977,000
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, collateral	0	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	1,114,000	6,977,000
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	0	0
NET AMOUNT
Derivative asset, net	1,114,000	6,977,000
Price risk derivatives | Energy risk management assets, current | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative asset	840,000	5,515,000
Price risk derivatives | Energy risk management liabilities
GROSS ASSET (LIABILITY)
Derivative liability	(599,000)	(834,000)
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative liability, collateral	0	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative liability	(599,000)	(834,000)
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, liability	0	0
NET AMOUNT
Derivative liability, net	(599,000)	(834,000)
Price risk derivatives | Energy risk management liabilities | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative liability	(273,000)	(597,000)
Natural gas derivatives | Energy risk management assets, current
GROSS ASSET (LIABILITY)
Derivative asset	107,842,000	37,061,000
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, collateral	(26,300,000)	(559,000)
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	81,542,000	36,502,000
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	(75,919,000)	(15,000,000)
NET AMOUNT
Derivative asset, net	5,623,000	21,502,000
Natural gas derivatives | Energy risk management liabilities
GROSS ASSET (LIABILITY)
Derivative liability		(559,000)
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative liability, collateral		559,000
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative liability		0
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, liability		0
NET AMOUNT
Derivative liability, net		0
Natural gas derivatives | Energy risk management assets, noncurrent
GROSS ASSET (LIABILITY)
Derivative asset	84,898,000	50,962,000
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, collateral	0	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	84,898,000	50,962,000
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	(6,081,000)	0
NET AMOUNT
Derivative asset, net	$ 78,817,000	$ 50,962,000