Summary of Significant Accounting Policies - Narrative (Details) - Storm reserve - Cleco Power - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Storm reserve, withdrawal	$ 13.1	$ 12.3
Accumulated restoration costs	$ (37.8)		$ 43.3