Leases - Finance Lease (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($) event	Sep. 30, 2019 USD ($) event	Apr. 30, 2018 barge
Lessee, Lease, Description [Line Items]
Finance lease, number of cancellation events triggering early termination | event	1	1
Finance lease, number of cancellation events | event	4	4
CLECO POWER
Lessee, Lease, Description [Line Items]
Finance lease payments | $	$ 0.6	$ 1.7
Revenue from subleases | $	$ 0.4	$ 1.3
CLECO POWER | Barges
Lessee, Lease, Description [Line Items]
Finance lease, number of leased assets | barge			42