Derivative Instruments - Amount of Gain (Loss) Recognized in Income on Derivatives (Details) - Not Designated as Hedging Instrument $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) derivative	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) derivative
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	$ (10,948)	$ 4,234	$ (17,225)	$ 4,580
CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(10,948)	4,234	(17,225)	4,580
FTRs | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	(200)	4,300	(200)	4,300
FTRs | Accumulated deferred fuel | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	(200)	4,300	(200)	4,300
FTRs | Electric operations
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	1,835	6,080	2,694	7,663
FTRs | Electric operations | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	1,835	6,080	2,694	7,663
FTRs | Purchased power
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(1,499)	(1,846)	(2,096)	(3,083)
FTRs | Purchased power | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(1,499)	(1,846)	(2,096)	(3,083)
Natural gas derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(11,284)	$ 0	(17,823)	$ 0
Number of derivatives held | derivative		0		0
Natural gas derivatives | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in income on derivatives	(11,284)	$ 0	(17,823)	$ 0
Number of derivatives held | derivative		0		0
Natural gas derivatives | Accumulated deferred fuel
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	8,200		3,700
Realized losses associated with natural gas derivatives	600		600
Natural gas derivatives | Accumulated deferred fuel | CLECO POWER
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gains (losses) associated with derivatives	8,200		3,700
Realized losses associated with natural gas derivatives	$ 600		$ 600