Fair Value Accounting and Financial Instruments - Derivative Instruments as Recorded in Consolidated Balance Sheets (Details) - Derivatives not designated as hedging instrument - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
GROSS ASSET (LIABILITY)
Commodity-related contracts, net	$ 93,607
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative, contract netting	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Net asset (liability) on the balance sheet	93,607	$ 10,167
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	(15,000)
NET AMOUNT
Net amount	78,607
CLECO POWER
GROSS ASSET (LIABILITY)
Commodity-related contracts, net	4,918	3,216
Price risk derivatives | Energy risk management assets, current
GROSS ASSET (LIABILITY)
Derivative asset	6,977
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, contract netting	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	6,977	4,805
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	0
NET AMOUNT
Derivative asset, net	6,977
Price risk derivatives | Energy risk management assets, current | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative asset	5,515	4,337
Price risk derivatives | Energy risk management liabilities, current
GROSS ASSET (LIABILITY)
Derivative liability	(834)
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative liability, contract netting	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative liability	(834)	(1,625)
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, liability	0
NET AMOUNT
Derivative liability, net	(834)
Price risk derivatives | Energy risk management liabilities, current | CLECO POWER
GROSS ASSET (LIABILITY)
Derivative liability	(597)	(1,121)
Natural gas derivatives | Energy risk management assets, current
GROSS ASSET (LIABILITY)
Derivative asset	37,061
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, contract netting	(559)
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	36,502	8,276
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	(15,000)
NET AMOUNT
Derivative asset, net	21,502
Natural gas derivatives | Energy risk management liabilities, current
GROSS ASSET (LIABILITY)
Derivative liability	(559)
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative liability, contract netting	559
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative liability	0	(828)
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	50,962
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative asset, contract netting	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative asset	50,962	323
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, assets	0
NET AMOUNT
Derivative asset, net	50,962
Natural gas derivatives | Other deferred credits, noncurrent
GROSS ASSET (LIABILITY)
Derivative liability	0
GROSS AMOUNTS OFFSET ON THE BALANCE SHEET
Derivative liability, contract netting	0
NET ASSET (LIABILITY) ON THE BALANCE SHEET
Derivative liability	0	$ (784)
GROSS AMOUNTS NOT OFFSET ON THE BALANCE SHEET (1)
Collateral, liability	0
NET AMOUNT
Derivative liability, net	$ 0