Pension Plan and Employee Benefits - Schedule of Current and Non-Current Portions of SERP Liability (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Current	$ 22,858	$ 26,439
Non-current	150,521	166,702
SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Current	4,815	4,815
Non-current	57,920	58,728
CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	18,121	21,701
Non-current	94,053	109,464
CLECO POWER | SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Current	833	833
Non-current	$ 9,963	$ 10,160