Summary of Significant Accounting Policies - Changes in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Line Items]
Receivable, threshold period past due	20 days
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,147	$ 1,302
Current period provision	5,506	3,362
Charge-offs	(4,939)	(4,800)
Recovery	1,298	1,283
Ending balance	3,012	1,147
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	2,785	2,940
Current period provision	5,506	3,362
Charge-offs	(4,939)	(4,800)
Recovery	1,298	1,283
Ending balance	4,650	2,785
Cleco Power
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,147	1,302
Current period provision	5,506	3,362
Charge-offs	(4,939)	(4,800)
Recovery	1,298	1,283
Ending balance	$ 3,012	$ 1,147