Pension Plan and Employee Benefits - Schedule of Current and Non-Current Portions of SERP Liability (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Non-current	$ 200,705	$ 200,665
CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Non-current	137,704	137,754
SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Current	4,713	4,713
Non-current	63,270	63,714
SERP Benefits | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	672	672
Non-current	$ 8,817	$ 9,087