Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 1,198,472	$ 1,577,349	$ 1,214,727
Total revenue unrelated to contracts with customers	40,319	27,131	11,597
Operating revenue, net	1,238,791	1,604,480	1,226,324
Electric customer credits	60,689	7,674	40,878
Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	908,881	1,169,612	898,658
Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	469,099	558,247	453,873
Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	304,422	370,678	294,553
Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	179,506	229,634	175,134
Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16,543	18,727	16,105
Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(60,689)	(7,674)	(41,007)
Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	212,093	322,226	241,307
Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	56,701	63,545	55,963
Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	6,256	13,884	11,597
Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	20,797	21,966	18,799
Securitization
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	34,063	13,247
CLECO POWER
Disaggregation of Revenue [Line Items]
Operating revenue, net		1,620,528	1,241,637
Electric customer credits		7,674	40,878
CLECO POWER | CLECO POWER
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	1,216,830	1,593,406	1,230,040
Total revenue unrelated to contracts with customers	40,315	27,122	11,597
Operating revenue, net	1,257,145	1,620,528	1,241,637
Electric customer credits	60,689	7,674	40,878
CLECO POWER | CLECO POWER | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8,904	6,377	5,641
CLECO POWER | CLECO POWER | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	908,881	1,169,612	898,658
CLECO POWER | CLECO POWER | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	469,099	558,247	453,873
CLECO POWER | CLECO POWER | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	304,422	370,678	294,553
CLECO POWER | CLECO POWER | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	179,506	229,634	175,134
CLECO POWER | CLECO POWER | Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	16,543	18,727	16,105
CLECO POWER | CLECO POWER | Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(60,689)	(7,674)	(41,007)
CLECO POWER | CLECO POWER | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	221,547	331,906	250,987
CLECO POWER | CLECO POWER | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	56,701	63,545	55,963
Electric customer credits			100
CLECO POWER | CLECO POWER | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	6,252	13,875	11,597
CLECO POWER | CLECO POWER | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	20,797	21,966	18,791
CLECO POWER | CLECO POWER | Securitization
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	34,063	13,247
OTHER
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	111,262	99,335	103,951
Total revenue unrelated to contracts with customers	5	9	0
Operating revenue, net	111,267	99,344	103,951
Electric customer credits	0	0	0
OTHER | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	120,716	109,015	113,623
OTHER | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
OTHER | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
OTHER | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
OTHER | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
OTHER | Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
OTHER | Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
OTHER | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(9,454)	(9,680)	(9,680)
OTHER | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
OTHER | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	5	9	0
OTHER | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	8
OTHER | Securitization
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	(129,620)	(115,392)	(119,264)
Total revenue unrelated to contracts with customers	(1)	0	0
Operating revenue, net	(129,621)	(115,392)	(119,264)
Electric customer credits	0	0	0
ELIMINATIONS | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(129,620)	(115,392)	(119,264)
ELIMINATIONS | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	0
ELIMINATIONS | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	(1)	0	0
ELIMINATIONS | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0	$ 0
ELIMINATIONS | Securitization
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	$ 0	$ 0