Variable Interest Entities - Schedule of Cleco Securitization I Financial Statement Impact (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Restricted cash and cash equivalents	$ 170,216		$ 170,216			$ 132,411
Intangible assets	666,622		666,622			384,908
Total assets	7,698,264	$ 7,369,606	7,698,264	$ 7,369,606		7,369,606
Long-term debt due within one year	457,228		457,228			264,934
Interest accrued	44,598		44,598			19,919
Long-term debt, net	2,558,672		2,558,672			2,645,043
Total liabilities	4,697,927		4,697,927			4,528,592
Member’s equity	3,000,337	2,888,576	3,000,337	2,888,576	$ 2,928,460	2,841,014	$ 2,856,789	$ 2,873,173
Total liabilities and member’s equity	7,698,264		7,698,264			7,369,606
Income Statement Related Disclosures [Abstract]
Operating revenue	406,770	340,135	1,023,775	869,162
Operating expenses	(286,563)	(224,166)	(734,932)	(705,301)
Interest income	4,062	6,366	15,227	10,427
Interest charges, net	(38,732)	(37,941)	(114,554)	(122,019)
Net income	90,049	87,207	197,329	48,308
Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	373,822		373,822			384,908
Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	292,800		292,800			0
Nonrelated Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	65,460		65,460			47,520
Accounts payable - affiliate	133,686		133,686			125,483
Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	5,653		5,653			35,459
Accounts payable - affiliate	19,939		19,939			21,368
VIE, Primary Beneficiary - Cleco Securitization I
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	7,210		7,210			15,918
Long-term debt due within one year	15,699		15,699			15,087
Interest accrued	1,448		1,448			5,997
Long-term debt, net	365,207		365,207			380,468
Member’s equity	2,133		2,133			2,157
Total liabilities and member’s equity	384,525		384,525			403,822
Income Statement Related Disclosures [Abstract]
Operating revenue	8,843	8,776	24,442	24,578
Operating expenses	(4,448)	(4,271)	(11,092)	(10,876)
Interest income	167	214	442	557
Interest charges, net	(4,537)	(4,694)	(13,718)	(14,185)
Net income	25	25	74	74
VIE, Primary Beneficiary - Cleco Securitization I | Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	373,822		373,822			384,908
Total assets	384,525		384,525			403,822
Total liabilities	382,392		382,392			401,665
VIE, Primary Beneficiary - Cleco Securitization I | Nonrelated Party
Balance Sheet Related Disclosures [Abstract]
Accounts payable - affiliate	3		3			0
VIE, Primary Beneficiary - Cleco Securitization I | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	3,493		3,493			2,996
Accounts payable - affiliate	35		35			113
Variable Interest Entity, Primary Beneficiary, Cleco Securitization II
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	12,538		12,538
Restricted cash and cash equivalents	2,720		2,720
Long-term debt due within one year	6,733		6,733
Interest accrued	8,646		8,646
Long-term debt, net	293,113		293,113
Member’s equity	2,355		2,355
Total liabilities and member’s equity	310,997		310,997
Income Statement Related Disclosures [Abstract]
Operating revenue	7,316		15,550
Operating expenses	(3,343)		(6,689)
Interest income	95		106
Interest charges, net	(4,037)		(8,900)
Net income	31		67
Variable Interest Entity, Primary Beneficiary, Cleco Securitization II | Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	292,800		292,800
Total assets	310,997		310,997
Total liabilities	308,642		308,642
Variable Interest Entity, Primary Beneficiary, Cleco Securitization II | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts payable - affiliate	150		150
CLECO POWER
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	2,939		2,939
Restricted cash and cash equivalents	170,191		170,191			132,387
Intangible assets	666,622		666,622			384,908
Total assets	5,744,900		5,744,900			5,388,769
Long-term debt due within one year	97,421		97,421			264,934
Interest accrued	31,217		31,217			11,781
Long-term debt, net	1,825,177		1,825,177			1,546,624
Member’s equity	2,292,357	2,097,779	2,292,357	2,097,779	$ 2,212,011	2,107,407	$ 2,043,852	$ 2,063,237
Total liabilities and member’s equity	5,744,900		5,744,900			5,388,769
Income Statement Related Disclosures [Abstract]
Operating revenue	405,621	337,367	1,019,914	878,112
Operating expenses	(283,213)	(221,065)	(724,706)	(684,828)
Interest income	1,408	1,065	7,434	3,257
Interest charges, net	(27,329)	(25,519)	(81,013)	(76,513)
Net income	100,398	93,068	229,012	114,318
CLECO POWER | Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	373,822		373,822			384,908
CLECO POWER | Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	292,800		292,800			0
CLECO POWER | Nonrelated Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	65,460		65,460			47,520
Accounts payable - affiliate	123,788		123,788			110,361
CLECO POWER | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	8		8			1,174
Accounts payable - affiliate	13,041		13,041			11,389
CLECO POWER | VIE, Primary Beneficiary - Cleco Securitization I
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	7,210		7,210			15,918
Long-term debt due within one year	15,699		15,699			15,087
Interest accrued	1,448		1,448			5,997
Long-term debt, net	365,207		365,207			380,468
Member’s equity	2,133		2,133			2,157
Total liabilities and member’s equity	384,525		384,525			403,822
Income Statement Related Disclosures [Abstract]
Operating revenue	8,843	8,776	24,442	24,578
Operating expenses	(4,448)	(4,271)	(11,092)	(10,876)
Interest income	167	214	442	557
Interest charges, net	(4,537)	(4,694)	(13,718)	(14,185)
Net income	25	$ 25	74	$ 74
CLECO POWER | VIE, Primary Beneficiary - Cleco Securitization I | Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	373,822		373,822			384,908
Total assets	384,525		384,525			403,822
Total liabilities	382,392		382,392			401,665
CLECO POWER | VIE, Primary Beneficiary - Cleco Securitization I | Nonrelated Party
Balance Sheet Related Disclosures [Abstract]
Accounts payable - affiliate	3		3			0
CLECO POWER | VIE, Primary Beneficiary - Cleco Securitization I | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	3,493		3,493			2,996
Accounts payable - affiliate	35		35			$ 113
CLECO POWER | Variable Interest Entity, Primary Beneficiary, Cleco Securitization II
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	12,538		12,538
Accounts receivable - affiliate	2,939		2,939
Restricted cash and cash equivalents	2,720		2,720
Long-term debt due within one year	6,733		6,733
Interest accrued	8,646		8,646
Long-term debt, net	293,113		293,113
Member’s equity	2,355		2,355
Total liabilities and member’s equity	310,997		310,997
Income Statement Related Disclosures [Abstract]
Operating revenue	7,316		15,550
Operating expenses	(3,343)		(6,689)
Interest income	95		106
Interest charges, net	(4,037)		(8,900)
Net income	31		67
CLECO POWER | Variable Interest Entity, Primary Beneficiary, Cleco Securitization II | Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	292,800		292,800
Total assets	310,997		310,997
Total liabilities	308,642		308,642
CLECO POWER | Variable Interest Entity, Primary Beneficiary, Cleco Securitization II | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts payable - affiliate	$ 150		$ 150