Summary of Significant Accounting Policies - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	$ 29,587	$ 15,918
Non-current	139,210	116,493
Total restricted cash and cash equivalents	168,797	132,411
Cleco Securitization I and Cleco Securitization II operating expenses and debt service
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	21,896	15,918
Cleco Securitization II Dolet Hills plant and mine retirement costs
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	7,691	0
Non-current	32,538	1
Diversified Lands’ mitigation escrow
Restricted Cash and Cash Equivalents Items [Line Items]
Non-current	25	24
Future storm restoration costs
Restricted Cash and Cash Equivalents Items [Line Items]
Non-current	106,647	116,468
CLECO POWER
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	29,587	15,918
Non-current	139,185	116,469
Total restricted cash and cash equivalents	168,772	132,387
CLECO POWER | Cleco Securitization I and Cleco Securitization II operating expenses and debt service
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	21,896	15,918
CLECO POWER | Cleco Securitization II Dolet Hills plant and mine retirement costs
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash - current	7,691	0
Non-current	32,538	1
CLECO POWER | Future storm restoration costs
Restricted Cash and Cash Equivalents Items [Line Items]
Non-current	$ 106,647	$ 116,468