Summary of Significant Accounting Policies - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Jun. 01, 2024
Accounting Policies [Line Items]
Receivable, threshold period past due	21 days
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,337	$ 3,012
Current period provision	2,278	2,048
Charge-offs	(3,256)	(4,815)
Recovery	916	1,092
Ending balance	1,275	1,337
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,638	1,638
Current period provision	0	0
Charge-offs	0	0
Recovery	0	0
Ending balance	1,638	1,638
Receivable, Allowance For Credit Loss [Roll Forward]
Beginning balance	2,975	4,650
Current period provision	2,278	2,048
Charge-offs	(3,256)	(4,815)
Recovery	916	1,092
Ending balance	2,913	2,975
Discontinued Operations, Held-for-sale | Cleco Cajun
Receivable, Allowance For Credit Loss [Roll Forward]
Sale purchase price payable			$ 108,400
Cleco Power
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,337	3,012
Current period provision	2,278	2,048
Charge-offs	(3,256)	(4,815)
Recovery	916	1,092
Ending balance	$ 1,275	$ 1,337