Derivative Instruments - Amount of Gain (Loss) Recognized in Income on Derivatives (Details) - AT DEC. 31, - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	$ (6,643)	$ (30,925)	$ (137,460)
Unrealized gains (losses) associated with derivatives	(11,679)	14,772
CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(6,643)	(24,466)	(20,879)
Unrealized gains (losses) associated with derivatives	(11,679)	14,772
FTRs
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	2,801	204
FTRs | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	2,801	204
FTRs | Electric operations
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	7,424	2,811	6,320
FTRs | Electric operations | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	7,424	2,811	6,320
FTRs | Purchased power
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(4,533)	(2,988)	(4,465)
FTRs | Purchased power | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(4,533)	(2,988)	(4,465)
Natural gas derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(9,534)	(30,748)	(139,315)
Unrealized gains (losses) associated with derivatives	(14,480)	14,568
Natural gas derivatives | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(9,534)	(24,289)	(22,734)
Unrealized gains (losses) associated with derivatives	$ (14,480)	$ 14,568
Natural gas derivatives | Accumulated Deferred Fuel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Loss on sale of derivatives			$ (2,000)