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, 2025	Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	$ 1,371	$ (19,346)
CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	1,371	(8,401)
FTRs | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	(400)	(400)
FTRs | CLECO POWER | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	(400)	(400)
FTRs | Electric operations
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	1,034	726
FTRs | Electric operations | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	1,034	726
FTRs | Purchased power
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(602)	(1,371)
FTRs | Purchased power | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(602)	(1,371)
Natural gas derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	939	(18,701)
Natural gas derivatives | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	1,100	(3,200)
Unrealized gains (losses) associated with derivatives	7,400	1,300
Natural gas derivatives | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	939	(7,756)
Natural gas derivatives | CLECO POWER | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	1,100	(3,200)
Unrealized gains (losses) associated with derivatives	$ 7,400	$ 1,300