Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 381,659	$ 491,466	$ 968,948	$ 1,181,426
Total revenue unrelated to contracts with customers	12,187	5,298	30,274	12,719
Operating revenue, net	393,846	496,764	999,222	1,194,145
Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	301,139	371,195	751,486	880,925
Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	166,638	190,023	376,978	434,259
Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	85,137	113,176	230,861	274,046
Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	45,214	64,486	132,239	160,948
Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,126	5,213	12,770	13,639
Storm recovery surcharge | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		5,025		5,025
Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	24	(6,728)	(1,362)	(6,992)
Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	58,520	95,513	158,877	237,971
Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	17,077	18,664	43,562	46,244
Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	2,203	5,298	4,830	12,719
Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,923	6,094	15,023	16,286
Securitization revenue
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	9,984		25,444
OPERATING SEGMENTS | CLECO POWER
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	385,628	495,543	981,046	1,193,429
Total revenue unrelated to contracts with customers	12,186	5,296	30,272	12,715
Operating revenue, net	397,814	500,839	1,011,318	1,206,144
OPERATING SEGMENTS | CLECO POWER | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,645	1,657	4,967	4,744
OPERATING SEGMENTS | CLECO POWER | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	301,139	371,195	751,486	880,925
OPERATING SEGMENTS | CLECO POWER | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	166,638	190,023	376,978	434,259
OPERATING SEGMENTS | CLECO POWER | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	85,137	113,176	230,861	274,046
OPERATING SEGMENTS | CLECO POWER | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	45,214	64,486	132,239	160,948
OPERATING SEGMENTS | CLECO POWER | Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,126	5,213	12,770	13,639
OPERATING SEGMENTS | CLECO POWER | Storm recovery surcharge | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		5,025		5,025
OPERATING SEGMENTS | CLECO POWER | Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	24	(6,728)	(1,362)	(6,992)
OPERATING SEGMENTS | CLECO POWER | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	60,844	97,933	166,008	245,231
OPERATING SEGMENTS | CLECO POWER | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	17,077	18,664	43,562	46,244
OPERATING SEGMENTS | CLECO POWER | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	2,202	5,296	4,828	12,715
OPERATING SEGMENTS | CLECO POWER | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	4,923	6,094	15,023	16,285
OPERATING SEGMENTS | CLECO POWER | Securitization revenue
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	9,984		25,444
OTHER
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	27,930	27,163	79,538	75,469
Total revenue unrelated to contracts with customers	0	1	1	4
Operating revenue, net	27,930	27,164	79,539	75,473
OTHER | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	30,253	29,583	86,669	82,728
OTHER | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
OTHER | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
OTHER | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
OTHER | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
OTHER | Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
OTHER | Storm recovery surcharge | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		0		0
OTHER | Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
OTHER | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(2,323)	(2,420)	(7,131)	(7,260)
OTHER | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
OTHER | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	0	1	1	4
OTHER | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	1
OTHER | Securitization revenue
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	0		0
ELIMINATIONS
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(31,899)	(31,240)	(91,636)	(87,472)
Total revenue unrelated to contracts with customers	1	1	1	0
Operating revenue, net	(31,898)	(31,239)	(91,635)	(87,472)
ELIMINATIONS | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(31,898)	(31,240)	(91,636)	(87,472)
ELIMINATIONS | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ELIMINATIONS | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ELIMINATIONS | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ELIMINATIONS | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ELIMINATIONS | Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ELIMINATIONS | Storm recovery surcharge | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		0		0
ELIMINATIONS | Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ELIMINATIONS | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(1)	0	0	0
ELIMINATIONS | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0	0
ELIMINATIONS | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	1	1	1	0
ELIMINATIONS | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	$ 0	0	$ 0
ELIMINATIONS | Securitization revenue
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	$ 0		$ 0