Pension Plan and Employee Benefits - Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Current	$ 35,520	$ 9,737
Non-current	196,321	200,580
Current	25,685	0
Non-current	91,638	98,584
CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	30,777	4,981
Non-current	132,321	137,754
Current	25,685	0
Non-current	91,638	98,584
OTHER BENEFITS
Defined Benefit Plan Disclosure [Line Items]
Current	5,241	5,017
Non-current	41,815	38,366
OTHER BENEFITS | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	4,479	4,310
Non-current	32,289	30,082
SERP BENEFITS
Defined Benefit Plan Disclosure [Line Items]
Current	4,593	4,713
Non-current	62,868	63,714
SERP BENEFITS | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Current	613	672
Non-current	$ 8,394	$ 9,087