Derivative Instruments - Amount of Gain (Loss) Recognized in Income on Derivatives (Details) - DERIVATIVES NOT DESIGNATED AS HEDGING INSTRUMENTS - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	$ (137,460,000)	$ 187,309,000	$ 136,581,000
CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(20,879,000)	6,787,000	2,437,000
FTRs | Accumulated Deferred Fuel | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	(400,000)	(500,000)	2,800,000
FTRs | Electric operations
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	6,320,000	14,118,000	12,797,000
FTRs | Electric operations | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	6,320,000	14,118,000	12,797,000
FTRs | Purchased power
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(4,465,000)	(7,331,000)	(10,360,000)
FTRs | Purchased power | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(4,465,000)	(7,331,000)	(10,360,000)
Natural Gas Derivatives
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(139,315,000)	180,522,000	134,144,000
Natural Gas Derivatives | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain (loss) recognized in income on derivatives	(22,734,000)	0	0
Unrealized gains (losses) associated with derivatives			$ 0
Natural Gas Derivatives | Accumulated Deferred Fuel | CLECO POWER
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gains (losses) associated with derivatives	(9,800,000)	4,900,000
Gain (loss) on sale of derivatives	$ (2,000,000.0)	$ 0