Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Receivable, threshold period past due		21 days
Storm reserve | CLECO POWER
Financing Receivable, Allowance for Credit Loss [Line Items]
Storm reserve, withdrawal	$ 12.3
Accumulated restoration costs		$ 37.8	$ 43.3