Regulation and Rates (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Jul. 31, 2019	Jun. 30, 2018	Jun. 30, 2017
Regulation and Rates [Line Items]
Refund due to customers	$ 29,735,000	$ 38,903,000
CLECO POWER
Regulation and Rates [Line Items]
Estimated refund for the tax-related benefits from the TCJA	19,700,000
Refund due to customers	28,921,000	$ 38,241,000	$ 79,200,000
Accrual for related interest	1,600,000
CLECO POWER | FERC
Regulation and Rates [Line Items]
Refund due to customers	3,500,000
CLECO POWER | LPSC | Merger Commitments, cost savings
Regulation and Rates [Line Items]
Accrual for net capital refund for capital expenditures paid for by third parties	6,100,000
CLECO POWER | 2019 FRP Monitoring Report | Merger Commitments, cost savings
Regulation and Rates [Line Items]
Refund due to customers	2,200,000
CLECO POWER | 2017 FRP Monitoring Report | LPSC
Regulation and Rates [Line Items]
Refund due to customers					$ 0
CLECO POWER | Transmission return on equity | FERC
Regulation and Rates [Line Items]
Refund due to customers	$ 1,000,000.0
CLECO POWER | FRP | LPSC
Regulation and Rates [Line Items]
Target ROE allowed by FRP	10.00%
Percentage of retail earnings within range to be returned to customers (in hundredths)	60.00%
ROE for customer credit, low range	10.90%
ROE for customer credit, high range	11.75%
CLECO POWER | FRP | LPSC | Maximum
Regulation and Rates [Line Items]
Target ROE allowed by FRP	10.90%
CLECO POWER | 2018 FRP Monitoring Report | LPSC
Regulation and Rates [Line Items]
Refund due to customers				$ 2,300,000
CLECO POWER | 2017 FRP Monitoring Report, Cost of Service Savings | LPSC
Regulation and Rates [Line Items]
Refund due to customers					$ 1,200,000