Leases - Finance Lease (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) event	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 30, 2018 barge
Finance lease, number of cancellation events triggering early termination | event	1
Finance lease, number of cancellation events | event	4
CLECO POWER
Finance lease, principal interest | $	$ 2.2	$ 2.0	$ 2.5
Sublease income | $	$ 1.7	$ 0.5	$ 0.3
Maritime Equipment | CLECO POWER
Finance lease, number of leased assets | barge				42