Derivative Instruments - Amount of Gain (Loss) Recognized in Income on Derivatives (Details) - DERIVATIVES NOT DESIGNATED AS HEDGING INSTRUMENTS - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	$ (30,925,000)	$ (137,460,000)	$ 187,309,000
CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(24,466,000)	(20,879,000)	6,787,000
FTRs | Accumulated Deferred Fuel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	200,000	(400,000)	(500,000)
FTRs | CLECO POWER | Accumulated Deferred Fuel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	200,000	(400,000)	(500,000)
FTRs | Electric operations
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	2,811,000	6,320,000	14,118,000
FTRs | Electric operations | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	2,811,000	6,320,000	14,118,000
FTRs | Purchased power
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(2,988,000)	(4,465,000)	(7,331,000)
FTRs | Purchased power | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(2,988,000)	(4,465,000)	(7,331,000)
Natural gas derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(30,748,000)	(139,315,000)	180,522,000
Natural gas derivatives | Accumulated Deferred Fuel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	14,600,000	(9,800,000)	4,900,000
Gain (loss) on sale of derivatives	0	(2,000,000)	0
Natural gas derivatives | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(24,289,000)	(22,734,000)	0
Natural gas derivatives | CLECO POWER | Accumulated Deferred Fuel
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	14,600,000	(9,800,000)	4,900,000
Gain (loss) on sale of derivatives	$ 0	$ (2,000,000)	$ 0