Intangible Assets, Intangible Liabilities, and Goodwill - Narrative (Details) - USD ($)		12 Months Ended
	Feb. 04, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2008	Sep. 30, 2021	Aug. 01, 2021	Mar. 31, 2020	Dec. 31, 2018	Apr. 13, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Residual value								$ 0
Impairments for intangibles			$ 0	$ 0
Goodwill		$ 1,490,797,000	1,490,797,000	1,490,797,000						$ 1,490,000,000
Intangible assets		82,235,000	111,731,000
Member’s equity		2,954,156,000	2,757,023,000	2,643,006,000					$ 2,124,740,000
CLECO POWER
Acquired Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill		0
Equity, fair value							$ 3,820,000,000
Member’s equity		1,948,537,000	$ 1,807,879,000	$ 1,713,392,000			$ 3,550,000,000		$ 1,594,533,000
Excess of the fair value over the carrying value, percent							7.60%
Excess of the fair value over the carrying value							$ 270,100,000
Power supply agreements | CLECO POWER
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible liabilities residual value	$ 0
LTSA | CLECO CAJUN
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible liabilities, remaining life	7 years
Right To Bill And Collect Storm Recovery Charges From Customers | Cleco Katrina/Rita
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible asset					$ 177,500,000
Right to Bill and Collect, Storm Recovery Charges From Customers, Net of Financing Costs | Cleco Katrina/Rita
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible asset					176,000,000
Financing costs | Cleco Katrina/Rita
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible asset					$ 1,500,000
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Residual value		0
Impairments for intangibles		3,800,000
Intangible assets		$ 0				$ 0
Power supply agreements | MINIMUM
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset expected useful life (in years)		7 years
Power supply agreements | MAXIMUM
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible asset expected useful life (in years)		19 years
Power supply agreements | CLECO POWER
Acquired Finite-Lived Intangible Assets [Line Items]
Residual value	$ 0
Power supply agreements | CLECO POWER | MINIMUM
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining life (in years)	6 years
Power supply agreements | CLECO POWER | MAXIMUM
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, remaining life (in years)	8 years