Storm Restoration (Details) customer in Thousands, $ in Thousands				2 Months Ended	3 Months Ended
	Oct. 28, 2020 USD ($) customer	Oct. 09, 2020 USD ($) customer	Aug. 27, 2020 USD ($) customer	Oct. 28, 2020 hurricane customer	Sep. 30, 2020 USD ($)	Oct. 31, 2020	Oct. 16, 2020	Sep. 18, 2020	Dec. 31, 2019 USD ($)
Hurricane Laura
Unusual or Infrequent Item, or Both [Line Items]
Capitalized storm restoration costs					$ 113,800
CLECO POWER | Deferred storm restoration costs — Hurricane Laura
Unusual or Infrequent Item, or Both [Line Items]
Regulatory assets					57,669				$ 0
CLECO POWER | Natural Disasters and Other Casualty Events | Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Number of hurricanes | hurricane				3
CLECO POWER | Hurricane Laura
Unusual or Infrequent Item, or Both [Line Items]
Number of customers affected with power outage | customer			140
Percentage of customers affected by the hurricane with power restored								100.00%
Estimate of storm restoration costs			$ 180,900
Capitalization percentage			63.00%
Capitalized storm restoration costs					113,800
Storm damage provision					$ 9,400
CLECO POWER | Hurricane Laura | Minimum
Unusual or Infrequent Item, or Both [Line Items]
Estimate of storm restoration costs			$ 185,000
CLECO POWER | Hurricane Laura | Maximum
Unusual or Infrequent Item, or Both [Line Items]
Estimate of storm restoration costs			$ 190,000
CLECO POWER | Hurricane Delta | Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Number of customers affected with power outage | customer		132
Percentage of customers affected by the hurricane with power restored							100.00%
CLECO POWER | Hurricane Delta | Subsequent Event | Minimum
Unusual or Infrequent Item, or Both [Line Items]
Estimate of storm restoration costs		$ 50,000
CLECO POWER | Hurricane Delta | Subsequent Event | Maximum
Unusual or Infrequent Item, or Both [Line Items]
Estimate of storm restoration costs		$ 55,000
CLECO POWER | Hurricane Zeta | Subsequent Event
Unusual or Infrequent Item, or Both [Line Items]
Number of customers affected with power outage | customer	73			73
Percentage of customers affected by the hurricane with power restored						100.00%
CLECO POWER | Hurricane Zeta | Subsequent Event | Minimum
Unusual or Infrequent Item, or Both [Line Items]
Estimate of storm restoration costs	$ 7,000
CLECO POWER | Hurricane Zeta | Subsequent Event | Maximum
Unusual or Infrequent Item, or Both [Line Items]
Estimate of storm restoration costs	$ 8,000