Regulation and Rates (Details)	1 Months Ended	6 Months Ended	60 Months Ended
	Feb. 28, 2015	Jun. 30, 2019 USD ($) claim	Jun. 30, 2019 USD ($)	Jul. 10, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Regulation and Rates [Line Items]
Refund due to customers		$ 54,611,000	$ 54,611,000		$ 35,842,000
CLECO POWER
Regulation and Rates [Line Items]
Estimated refund for the tax-related benefits from the TCJA		47,500,000	47,500,000
Payments received for capital expenditures subject to refund		2,400,000	2,400,000
Refund due to customers		53,238,000	53,238,000		$ 35,842,000
Accrual for related interest		3,000,000	3,000,000
Accrual for net capital refund for capital expenditures paid for by third parties		1,700,000	1,700,000
CLECO POWER | Subsequent Event
Regulation and Rates [Line Items]
Refund due to customers				$ 79,200,000
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	6,100,000
CLECO POWER | Transmission return on equity | FERC
Regulation and Rates [Line Items]
Refund due to customers		1,900,000	1,900,000
CLECO POWER | MISO Transmission Rates | FERC
Regulation and Rates [Line Items]
Refund due to customers		$ 1,900,000	$ 1,900,000
Loss contingency, new claims filed, number | claim		2
Target ROE allowed by FRP	12.38%
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 | 2017 FRP Monitoring Report | LPSC
Regulation and Rates [Line Items]
Refund due to customers								$ 0
CLECO POWER | 2017 FRP Monitoring Report, Cost of Service Savings | LPSC
Regulation and Rates [Line Items]
Refund due to customers						$ 1,200,000		$ 1,200,000
CLECO POWER | 2018 FRP Monitoring Report, Earnings-Related Refunds | LPSC
Regulation and Rates [Line Items]
Refund due to customers							$ 0
CLECO POWER | 2018 FRP Monitoring Report, Cost of Service Savings | LPSC
Regulation and Rates [Line Items]
Refund due to customers		$ 1,200,000	$ 1,200,000				$ 1,200,000