Leases - Operating Leases (Details)	Jul. 09, 2019	Jun. 30, 2019	Jun. 30, 2019 municipality	Jun. 30, 2019 non_municipal_public_body	Jun. 30, 2019 railcar	Jun. 30, 2019 towboat
CLECO POWER
Lessee, Lease, Description [Line Items]
Operating lease, number of lessors			2	1
CLECO POWER | Utility Systems | Municipality One
Lessee, Lease, Description [Line Items]
Operating lease term		10 years
CLECO POWER | Utility Systems | Municipality One | Subsequent Event
Lessee, Lease, Description [Line Items]
Operating lease renewal term	10 years
CLECO POWER | Utility Systems | Municipality Two
Lessee, Lease, Description [Line Items]
Operating lease term		10 years
CLECO POWER | Utility Systems | Non-Municipal Public Body
Lessee, Lease, Description [Line Items]
Operating lease term		27 years
CLECO POWER | Railcars
Lessee, Lease, Description [Line Items]
Operating lease, number of leased assets					200
CLECO POWER | Railcars | Operating Lease, Expiring March 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease, number of leased assets					115
CLECO POWER | Railcars | Operating Lease, Expiring March 31, 2020
Lessee, Lease, Description [Line Items]
Operating lease, number of leased assets					85
CLECO POWER | Towboats
Lessee, Lease, Description [Line Items]
Operating lease term		10 years
Operating lease renewal term		5 years
Operating lease, number of leased assets | towboat						3
Cleco Cajun | Railcars
Lessee, Lease, Description [Line Items]
Operating lease term		12 months
Operating lease renewal term		1 month
Operating lease, number of leased assets					135