Derivative Instruments - Schedule of Amount of Gain (Loss) Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instrument - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	$ (9,713,000)	$ 87,099,000	$ (109,372,000)	$ 257,566,000
CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(1,516,000)	2,722,000	(18,742,000)	7,302,000
FTRs | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	100,000	(1,400,000)	(200,000)	200,000
FTRs | Electric operations
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	2,227,000	5,297,000	4,920,000	12,960,000
FTRs | Electric operations | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	2,227,000	5,297,000	4,920,000	12,960,000
FTRs | Purchased power
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(1,690,000)	(2,575,000)	(3,786,000)	(5,658,000)
FTRs | Purchased power | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(1,690,000)	(2,575,000)	(3,786,000)	(5,658,000)
Natural gas derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(10,250,000)	84,377,000	(110,506,000)	250,264,000
Natural gas derivatives | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(2,053,000)	0	(19,876,000)	0
Natural gas derivatives | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Realized gains (losses) associated with derivatives	(300,000)		(300,000)
Natural gas derivatives | Accumulated deferred fuel | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	(4,000,000.0)		800,000
Realized gains (losses) associated with derivatives	$ (300,000)	0	$ (300,000)	0
Natural gas derivatives | Accumulated deferred fuel | CLECO POWER | Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives		$ (100,000)		$ (100,000)