Regulatory Assets and Liabilities - Narrative (Details) customer in Thousands, $ in Thousands	Mar. 31, 2021 USD ($)	Mar. 29, 2021 USD ($)	Feb. 17, 2021 customer	Feb. 14, 2021 customer	Dec. 31, 2020 USD ($)
Deferred storm restoration costs - Winter Storms Uri & Viola
Regulatory Liabilities [Line Items]
Capitalized storm restoration costs	$ 8,300
CLECO POWER
Regulatory Liabilities [Line Items]
Regulatory Assets	518,465				$ 456,034
CLECO POWER | Hurricane Laura
Regulatory Liabilities [Line Items]
Regulatory Assets	$ 54,744				$ 54,406
CLECO POWER | Deferred storm restoration costs - Winter Storms Uri & Viola
Regulatory Liabilities [Line Items]
Capitalized storm restoration costs		$ 50,000
CLECO POWER | Winter Storm Uri
Regulatory Liabilities [Line Items]
Number of customers affected with power outage | customer				11
CLECO POWER | Winter Storm Viola
Regulatory Liabilities [Line Items]
Number of customers affected with power outage | customer			43