Summary of Significant Accounting Policies - Schedule of Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash - current	$ 30,368	$ 15,918
Non-current	139,848	116,493
Total restricted cash and cash equivalents	170,216	132,411
Cleco Securitization I and Cleco Securitization II operating expenses and debt service
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash - current	19,748	15,918
Cleco Securitization II energy transition costs
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash - current	10,620	0
Non-current	31,919	1
Diversified Lands’ mitigation escrow
Restricted Cash and Cash Equivalent Item [Line Items]
Non-current	25	24
Future storm restoration costs
Restricted Cash and Cash Equivalent Item [Line Items]
Non-current	107,904	116,468
CLECO POWER
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash - current	30,368	15,918
Non-current	139,823	116,469
Total restricted cash and cash equivalents	170,191	132,387
CLECO POWER | Cleco Securitization I and Cleco Securitization II operating expenses and debt service
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash - current		15,918
CLECO POWER | Cleco Securitization II energy transition costs
Restricted Cash and Cash Equivalent Item [Line Items]
Restricted cash - current	10,620	0
Non-current	31,919	1
CLECO POWER | Future storm restoration costs
Restricted Cash and Cash Equivalent Item [Line Items]
Non-current	$ 107,904	$ 116,468