Summary of Significant Accounting Policies - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Public Utility, Property, Plant and Equipment [Line Items]
Capitalized software, net	$ 156,700	$ 164,500
Capitalized software costs, amortization	11,092	11,881	$ 11,561
Property, Plant and Equipment, Net
Generation	1,944,260	1,926,482
Distribution	1,585,742	1,429,374
Transmission	844,897	789,181
Other utility plant	454,329	449,431
Other property, plant, and equipment	9,766	9,571
Total property, plant, and equipment	4,838,994	4,604,039
Accumulated depreciation	(924,624)	(752,376)
Net property, plant, and equipment	3,914,370	3,851,663
Acadia Unit 1 acquisition costs
Public Utilities, Property, Plant and Equipment, Acquisition Adjustments
Plant acquisition adjustment	76,116	76,116
Accumulated amortization	(24,566)	(21,383)
Net plant acquisition adjustment	$ 51,550	54,733
Minimum
Utility Plants
Generation	10 years
Distribution	15 years
Transmission	5 years
Other utility plant	5 years
Other property, plant, and equipment	5 years
Maximum
Utility Plants
Generation	55 years
Distribution	50 years
Transmission	55 years
Other utility plant	45 years
Other property, plant, and equipment	45 years
CLECO POWER
Public Utility, Property, Plant and Equipment [Line Items]
Capitalized software, net	$ 154,900	162,300
Capitalized software costs, amortization	10,650	11,614	$ 11,268
Property, Plant and Equipment, Net
Generation	2,339,410	2,321,640
Distribution	2,022,257	1,866,662
Transmission	1,056,218	1,000,783
Other utility plant	551,470	547,441
Total property, plant, and equipment	5,969,355	5,736,526
Accumulated depreciation	(2,244,217)	(2,082,153)
Net property, plant, and equipment	3,725,138	3,654,373
CLECO POWER | Acadia Unit 1 acquisition costs
Public Utilities, Property, Plant and Equipment, Acquisition Adjustments
Plant acquisition adjustment	95,578	95,578
Accumulated amortization	(44,028)	(40,845)
Net plant acquisition adjustment	$ 51,550	$ 54,733
CLECO POWER | Minimum
Utility Plants
Generation	10 years
Distribution	15 years
Transmission	5 years
Other utility plant	5 years
Other property, plant, and equipment	5 years
CLECO POWER | Maximum
Utility Plants
Generation	55 years
Distribution	50 years
Transmission	55 years
Other utility plant	45 years
Other property, plant, and equipment	45 years