Leases - Lease Income Under Cottonwood Sale Leaseback (Details) - Cleco Cajun - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lessor, Lease, Description [Line Items]
Fixed payments	$ 10,000	$ 10,000	$ 30,000	$ 30,000
Variable payments	4,938	5,190	15,413	15,950
Amortization of deferred lease liability	2,301	2,301	6,904	6,904
Total lease income	$ 17,239	$ 17,491	$ 52,317	$ 52,854