Pension Plan and Employee Benefits - Current and Non-Current Portions of SERP Liability (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Non-current	$ 291,606	$ 291,606
SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Current	4,654	4,654
Non-current	88,082	88,523
CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Non-current	205,651	205,214
CLECO POWER | SERP Benefits
Defined Benefit Plan Disclosure [Line Items]
Current	679	679
Non-current	$ 12,788	$ 12,909