Revenue Recognition - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 268,119	$ 310,528
Total revenue unrelated to contracts with customers	8,723	10,053
Operating revenue, net	276,842	320,581
Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	201,444	238,186
Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	92,012	107,196
Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	68,146	77,657
Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	39,401	49,410
Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,732	4,574
Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(1,847)	(651)
Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	47,532	54,263
Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	13,894	12,530
Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	649	827
Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	5,249	5,549
Securitization revenue
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	8,074	9,226
OPERATING SEGMENTS | CLECO POWER
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	279,311	314,636
Total revenue unrelated to contracts with customers	8,723	10,052
Operating revenue, net	288,034	324,688
OPERATING SEGMENTS | CLECO POWER | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	8,869	1,688
OPERATING SEGMENTS | CLECO POWER | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	201,444	238,186
OPERATING SEGMENTS | CLECO POWER | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	92,012	107,196
OPERATING SEGMENTS | CLECO POWER | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	68,146	77,657
OPERATING SEGMENTS | CLECO POWER | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	39,401	49,410
OPERATING SEGMENTS | CLECO POWER | Other retail | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	3,732	4,574
OPERATING SEGMENTS | CLECO POWER | Electric customer credits | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(1,847)	(651)
OPERATING SEGMENTS | CLECO POWER | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	49,855	56,683
OPERATING SEGMENTS | CLECO POWER | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	13,894	12,530
OPERATING SEGMENTS | CLECO POWER | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	649	826
OPERATING SEGMENTS | CLECO POWER | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	5,249	5,549
OPERATING SEGMENTS | CLECO POWER | Securitization revenue
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	8,074	9,226
OTHER
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	27,344	25,094
Total revenue unrelated to contracts with customers	0	1
Operating revenue, net	27,344	25,095
OTHER | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	29,667	27,514
OTHER | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
OTHER | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
OTHER | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
OTHER | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
OTHER | Other retail | 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
OTHER | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(2,323)	(2,420)
OTHER | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
OTHER | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	0	1
OTHER | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
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	(38,536)	(29,202)
Total revenue unrelated to contracts with customers	0	0
Operating revenue, net	(38,536)	(29,202)
ELIMINATIONS | Affiliate
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	(38,536)	(29,202)
ELIMINATIONS | Total retail revenue | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
ELIMINATIONS | Residential | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
ELIMINATIONS | Commercial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
ELIMINATIONS | Industrial | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
ELIMINATIONS | Other retail | 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
ELIMINATIONS | Wholesale, net | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
ELIMINATIONS | Transmission | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
ELIMINATIONS | Other
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	0	0
ELIMINATIONS | Other | Nonrelated Party
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
ELIMINATIONS | Securitization revenue
Disaggregation of Revenue [Line Items]
Total revenue unrelated to contracts with customers	$ 0	$ 0