Summary of Significant Accounting Policies - Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Restricted Cash and Cash Equivalents Items [Line Items]
Current	$ 1,675	$ 1,674
Non-current	745	745
Total restricted cash and cash equivalents	2,420	2,419
CLECO POWER
Restricted Cash and Cash Equivalents Items [Line Items]
Current	1,675	1,674
Total restricted cash and cash equivalents	1,675	1,674
Cleco Katrina/Rita storm recovery surcharge
Restricted Cash and Cash Equivalents Items [Line Items]
Current	1,675	1,674
Cleco Katrina/Rita storm recovery surcharge | CLECO POWER
Restricted Cash and Cash Equivalents Items [Line Items]
Current	1,675	1,674
Diversified Lands’ mitigation escrow
Restricted Cash and Cash Equivalents Items [Line Items]
Non-current	22	22
Cleco Cajun’s defense fund
Restricted Cash and Cash Equivalents Items [Line Items]
Non-current	$ 723	$ 723