Derivative Instruments - Schedule of Amount of Gain (Loss) Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	$ (19,346)	$ (83,643)
CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(8,401)	(6,277)
FTRs | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	(400)	(100)
FTRs | Accumulated deferred fuel | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	(400)	(100)
FTRs | Electric operations
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	726	859
FTRs | Electric operations | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	726	859
FTRs | Purchased power
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(1,371)	(596)
FTRs | Purchased power | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(1,371)	(596)
Natural gas derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(18,701)	(83,906)
Natural gas derivatives | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(7,756)	(6,540)
Natural gas derivatives | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	1,300	(4,500)
Realized gains (losses) associated with derivatives	(3,200)	(1,800)
Natural gas derivatives | Accumulated deferred fuel | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	1,300	(4,500)
Realized gains (losses) associated with derivatives	$ (3,200)	$ (1,800)