Pension Plan and Employee Benefits - Schedule of Current and Non-Current Portions of SERP Liability (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Current	$ 35,520	$ 35,520
Non-current	196,009	196,321
CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	30,777	30,777
Non-current	132,169	132,321
SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Current	4,593	4,593
Non-current	62,592	62,868
SERP Benefits | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	613	613
Non-current	$ 8,308	$ 8,394