Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Total regulatory assets, net	$ 300,087	$ 311,525
CLECO POWER
Regulatory Liabilities [Line Items]
Total regulatory assets, net	144,727	152,549
CLECO POWER | Deferred taxes, net
Regulatory Liabilities [Line Items]
Regulatory liabilities	(146,225)	(146,948)
CLECO POWER | Corporate franchise tax, net
Regulatory Liabilities [Line Items]
Regulatory liabilities	(1,145)	(1,145)
CLECO POWER | Other, net
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ (1,039)	$ (4,543)