Variable Interest Entities - Schedule of Cleco Securitization I Financial Statement Impact (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	$ 29,587		$ 29,587			$ 15,918
Intangible assets	674,561		674,561			384,908
Total assets	7,631,523	$ 7,369,606	7,631,523	$ 7,369,606		7,369,606
Long-term debt due within one year	456,801		456,801			264,934
Interest accrued	24,273		24,273			19,919
Long-term debt, net	2,567,264		2,567,264			2,645,043
Total liabilities	4,703,063		4,703,063			4,528,592
Member’s equity	2,928,460	2,856,789	2,928,460	2,856,789	$ 2,880,944	2,841,014	$ 2,815,643	$ 2,873,173
Total liabilities and member’s equity	7,631,523		7,631,523			7,369,606
Income Statement Related Disclosures [Abstract]
Operating revenue	321,761	252,185	617,005	529,027
Operating expenses	(232,104)	(189,916)	(448,372)	(481,135)
Interest income	4,032	2,653	11,165	4,061
Interest charges, net	(38,644)	(41,286)	(75,822)	(84,078)
Net income	57,911	12,624	107,280	(38,898)
Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	378,488		378,488			384,908
Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	296,073		296,073			0
Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	39,358		39,358			35,459
Accounts payable - affiliate	21,330		21,330			21,368
VIE, Primary Beneficiary - Cleco Securitization I
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	14,220		14,220			15,918
Long-term debt due within one year	15,390		15,390			15,087
Interest accrued	5,888		5,888			5,997
Long-term debt, net	372,324		372,324			380,468
Member’s equity	2,158		2,158			2,157
Total liabilities and member’s equity	395,821		395,821			403,822
Income Statement Related Disclosures [Abstract]
Operating revenue	7,662	7,766	15,599	15,802
Operating expenses	(3,167)	(3,139)	(6,644)	(6,606)
Interest income	92	116	275	343
Interest charges, net	(4,562)	(4,718)	(9,181)	(9,490)
Net income	25	25	49	49
VIE, Primary Beneficiary - Cleco Securitization I | Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	378,488		378,488			384,908
Total assets	395,821		395,821			403,822
Total liabilities	393,663		393,663			401,665
VIE, Primary Beneficiary - Cleco Securitization I | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	3,113		3,113			2,996
Accounts payable - affiliate	61		61			113
Variable Interest Entity, Primary Beneficiary, Cleco Securitization II
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	7,676		7,676
Long-term debt due within one year	6,733		6,733
Interest accrued	4,735		4,735
Long-term debt, net	292,985		292,985
Member’s equity	2,324		2,324
Total liabilities and member’s equity	306,777		306,777
Income Statement Related Disclosures [Abstract]
Operating revenue	8,234		8,234
Operating expenses	(3,328)		(3,346)
Interest income	11		11
Interest charges, net	(4,016)		(4,863)
Net income	901		36
Variable Interest Entity, Primary Beneficiary, Cleco Securitization II | Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	296,073		296,073
Total assets	306,777		306,777
Total liabilities	304,453		304,453
CLECO POWER
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	29,587		29,587			15,918
Accounts receivable - affiliate	3,028		3,028
Intangible assets	674,561		674,561			384,908
Total assets	5,651,703		5,651,703			5,388,769
Long-term debt due within one year	97,098		97,098			264,934
Interest accrued	16,074		16,074			11,781
Long-term debt, net	1,831,958		1,831,958			1,546,624
Member’s equity	2,212,011	2,043,852	2,212,011	2,043,852	$ 2,156,643	2,107,407	$ 2,016,843	$ 2,063,237
Total liabilities and member’s equity	5,651,703		5,651,703			5,388,769
Income Statement Related Disclosures [Abstract]
Operating revenue	320,464	252,712	614,293	540,745
Operating expenses	(229,480)	(189,736)	(441,496)	(463,763)
Interest income	1,435	904	6,026	2,192
Interest charges, net	(27,242)	(25,480)	(53,684)	(50,994)
Net income	67,714	28,858	128,614	21,250
CLECO POWER | Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	378,488		378,488			384,908
CLECO POWER | Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	296,073		296,073			0
CLECO POWER | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	8		8			1,174
Accounts payable - affiliate	8,950		8,950			11,389
CLECO POWER | VIE, Primary Beneficiary - Cleco Securitization I
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	14,220		14,220			15,918
Long-term debt due within one year	15,390		15,390			15,087
Interest accrued	5,888		5,888			5,997
Long-term debt, net	372,324		372,324			380,468
Member’s equity	2,158		2,158			2,157
Total liabilities and member’s equity	395,821		395,821			403,822
Income Statement Related Disclosures [Abstract]
Operating revenue	7,662	7,766	15,599	15,802
Operating expenses	(3,167)	(3,139)	(6,644)	(6,606)
Interest income	92	116	275	343
Interest charges, net	(4,562)	(4,718)	(9,181)	(9,490)
Net income	25	$ 25	49	$ 49
CLECO POWER | VIE, Primary Beneficiary - Cleco Securitization I | Storm Recovery Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	378,488		378,488			384,908
Total assets	395,821		395,821			403,822
Total liabilities	393,663		393,663			401,665
CLECO POWER | VIE, Primary Beneficiary - Cleco Securitization I | Related Party
Balance Sheet Related Disclosures [Abstract]
Accounts receivable - affiliate	3,113		3,113			2,996
Accounts payable - affiliate	61		61			$ 113
CLECO POWER | Variable Interest Entity, Primary Beneficiary, Cleco Securitization II
Balance Sheet Related Disclosures [Abstract]
Restricted cash - current	7,676		7,676
Accounts receivable - affiliate	3,028		3,028
Long-term debt due within one year	6,733		6,733
Interest accrued	4,735		4,735
Long-term debt, net	292,985		292,985
Member’s equity	2,324		2,324
Total liabilities and member’s equity	306,777		306,777
Income Statement Related Disclosures [Abstract]
Operating revenue	8,234		8,234
Operating expenses	(3,328)		(3,346)
Interest income	11		11
Interest charges, net	(4,016)		(4,863)
Net income	901		36
CLECO POWER | Variable Interest Entity, Primary Beneficiary, Cleco Securitization II | Energy Transition Property
Balance Sheet Related Disclosures [Abstract]
Intangible assets	296,073		296,073
Total assets	306,777		306,777
Total liabilities	$ 304,453		$ 304,453