Leases - Lease Income Under Cottonwood Sale Leaseback (Details) - Cleco Cajun - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lessor, Lease, Description [Line Items]
Fixed payments	$ 10,000	$ 10,000	$ 20,000	$ 20,000
Variable payments	5,010	5,194	10,475	10,760
Amortization of deferred lease liability	2,301	2,301	4,603	4,603
Total lease income	$ 17,311	$ 17,495	$ 35,078	$ 35,363