Pension Plan and Employee Benefits - Schedule of Current and Non-Current Portions of the Other Benefits Liability (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Current	$ 12,764	$ 16,344
Non-current	54,682	69,250
Current	22,858	26,439
Non-current	150,521	166,702
Other Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Current	5,279	5,279
Non-current	37,919	38,724
CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	12,764	16,344
Non-current	54,682	69,250
Current	18,121	21,701
Non-current	94,053	109,464
CLECO POWER | Other Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Current	4,524	4,524
Non-current	$ 29,407	$ 30,054