Storm Restoration (Details) $ in Thousands			1 Months Ended	2 Months Ended	6 Months Ended
	May 19, 2021 USD ($)	Mar. 29, 2021 USD ($)	Mar. 31, 2021 USD ($)	Oct. 28, 2020 USD ($) hurricane	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Hurricanes
Unusual or Infrequent Item, or Both [Line Items]
Capitalization percentage				63.00%
Capitalized storm restoration costs, interim storm recovery amount	$ 16,000
Deferred storm restoration costs - Winter Storms Uri & Viola
Unusual or Infrequent Item, or Both [Line Items]
Capitalization percentage					80.00%
CLECO POWER
Unusual or Infrequent Item, or Both [Line Items]
Regulatory assets					$ 583,746	$ 456,034
CLECO POWER | Hurricane Laura, Delta and Zeta
Unusual or Infrequent Item, or Both [Line Items]
Regulatory assets					77,700
CLECO POWER | Deferred storm restoration costs - Winter Storms Uri & Viola
Unusual or Infrequent Item, or Both [Line Items]
Regulatory assets					1,980	$ 0
CLECO POWER | Hurricanes
Unusual or Infrequent Item, or Both [Line Items]
Number of hurricanes | hurricane				3
Estimate of storm restoration costs				$ 243,000
Capitalized storm restoration costs				$ 152,400
CLECO POWER | Deferred storm restoration costs - Winter Storms Uri & Viola
Unusual or Infrequent Item, or Both [Line Items]
Estimate of storm restoration costs					10,500
Capitalized storm restoration costs		$ 50,000			8,400
Capitalized storm restoration costs, amortization period		12 months
Fuel and purchased power costs					55,000
CLECO POWER | Deferred storm restoration costs - Winter Storms Uri & Viola | Letters of Credit
Unusual or Infrequent Item, or Both [Line Items]
Collateral returned			$ 24,900
Cleco Cajun | Deferred storm restoration costs - Winter Storms Uri & Viola
Unusual or Infrequent Item, or Both [Line Items]
Fuel and purchased power costs					$ 11,200
Cleco Cajun | Deferred storm restoration costs - Winter Storms Uri & Viola | Letters of Credit
Unusual or Infrequent Item, or Both [Line Items]
Collateral returned			$ 6,500