Intangible Assets, Intangible Liabilities, and Goodwill - Narrative (Details)			1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 01, 2022 USD ($)	Jun. 22, 2022 USD ($)	Aug. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Apr. 13, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill				$ 1,490,797,000		$ 1,490,797,000		$ 1,490,797,000	$ 1,490,000,000
Goodwill impairment	$ 0
Storm recover property
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 415,900,000
Amortization of intangible assets				0		0
Intangible assets				415,946,000		415,946,000		$ 0
Power supply agreements
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets				6,400,000	$ 6,400,000	19,200,000	$ 19,200,000
Intangible assets, residual value				0		$ 0
Power supply agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life						7 years
Power supply agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life						19 years
Trade name
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets				0	3,770,000	$ 0	3,897,000
Impairment of intangible assets			$ 3,800,000
Intangible assets					$ 0		$ 0
Trade name | Level 3 | Average rate | Discounted Cash Flow
Finite-Lived Intangible Assets [Line Items]
Measurement input			0.08
Cleco Cajun | LTSA
Finite-Lived Intangible Assets [Line Items]
Intangible liabilities, remaining life						7 years
Cleco Cajun | Power supply agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, residual value				$ 0		$ 0
Cleco Cajun | Power supply agreements | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining life						6 years
Cleco Cajun | Power supply agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining life						8 years