Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Uncertain Tax Positions [Line Items]
Liability for uncertain tax positions	$ 0		$ 0
Interest payable related to uncertain tax positions	0		0
Penalties	0	$ 0
Deferred employer payroll tax payments			6,000,000.0
Deferred employer payroll tax payments to be paid in 2021			3,000,000.0
Deferred employer payroll tax payments to be paid in 2022			3,000,000.0
CLECO POWER
Uncertain Tax Positions [Line Items]
Liability for uncertain tax positions	0		0
Interest payable related to uncertain tax positions	$ 0		0
Deferred employer payroll tax payments			3,600,000
Deferred employer payroll tax payments to be paid in 2021			1,800,000
Deferred employer payroll tax payments to be paid in 2022			$ 1,800,000