Segment Disclosures (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Revenue
Base revenue	$ 236,841,000	$ 226,804,000	$ 609,876,000	$ 543,640,000
Fuel cost recovery revenue	134,515,000	85,593,000	321,074,000	249,398,000
Other operations	35,414,000	28,784,000	92,825,000	79,565,000
Affiliate revenue	0	0	0	0
Electric customer credits	0	(1,046,000)	0	(3,441,000)
Operating revenue, net	406,770,000	340,135,000	1,023,775,000	869,162,000
Depreciation and amortization	54,652,000	50,479,000	158,139,000	197,855,000
Interest income	4,062,000	6,366,000	15,227,000	10,427,000
Interest charges	38,034,000	37,436,000	112,107,000	119,120,000
Federal and state income tax expense (benefit)	17,789,000	(6,643,000)	36,860,000	(4,928,000)
Income (loss) from continuing operations, net of income taxes	72,260,000	93,850,000	160,469,000	53,236,000
Income from discontinued operations, net of income taxes	0	742,000	0	45,415,000
Net income	72,260,000	94,592,000	160,469,000	98,651,000
Additions to property, plant, and equipment		190,676,000	251,223,000
Equity investment in investee	1,916,000	1,916,000	1,916,000	1,916,000	$ 1,916,000
Goodwill	1,490,797,000	1,490,797,000	1,490,797,000	1,490,797,000	1,490,797,000
Total segment assets	7,698,264,000	7,369,606,000	7,698,264,000	7,369,606,000	7,369,606,000
Other corporate costs and noncash items	(843,000)	(3,526,000)	(1,165,000)	18,789,000
EBITDA	177,830,000	165,230,000	451,183,000	373,645,000
Power supply agreements
Revenue
Amortization of intangible assets	186,000	186,000	558,000	2,695,000
CLECO POWER
Revenue
Other operations	33,835,000	24,433,000	87,672,000	74,032,000
Affiliate revenue	244,000	1,397,000	734,000	11,788,000
Electric customer credits	0	(1,046,000)	0	(3,441,000)
Operating revenue, net	405,621,000	337,367,000	1,019,914,000	878,112,000
Interest income	1,408,000	1,065,000	7,434,000	3,257,000
Interest charges	26,631,000	25,014,000	78,566,000	73,614,000
Federal and state income tax expense (benefit)	20,269,000	9,396,000	44,715,000	10,508,000
Net income	80,129,000	83,672,000	184,297,000	103,810,000
Equity investment in investee	1,916,000		1,916,000		1,916,000
Total segment assets	5,744,900,000		5,744,900,000		$ 5,388,769,000
Cleco Cajun | Natural gas derivatives
Revenue
Net gain (loss) recognized in income on derivatives		0		(6,500,000)
OPERATING SEGMENTS | CLECO POWER
Revenue
Base revenue	237,027,000	226,990,000	610,434,000	546,335,000
Fuel cost recovery revenue	134,515,000	85,593,000	321,074,000	249,398,000
Other operations	33,835,000	24,433,000	87,672,000	74,032,000
Affiliate revenue	244,000	1,397,000	734,000	11,788,000
Electric customer credits		(1,046,000)		(3,441,000)
Operating revenue, net	405,621,000	337,367,000	1,019,914,000	878,112,000
Recoverable fuel and purchased power	134,491,000	85,706,000	321,052,000	249,549,000
Non-recoverable fuel and purchased power	13,196,000	12,169,000	19,340,000	25,781,000
Other operations and maintenance	67,374,000	60,387,000	187,889,000	176,817,000
Taxes other than income taxes	15,943,000	14,590,000	45,386,000	43,711,000
Other segment items	(3,213,000)	(715,000)	(4,936,000)	8,609,000
Depreciation and amortization	52,209,000	48,213,000	151,039,000	188,970,000
Interest income	1,408,000	1,065,000	7,434,000	3,257,000
Interest charges	26,631,000	25,014,000	78,566,000	73,614,000
Federal and state income tax expense (benefit)	20,269,000	9,396,000	44,715,000	10,508,000
Income (loss) from continuing operations, net of income taxes		83,672,000		103,810,000
Income from discontinued operations, net of income taxes		0		0
Net income	80,129,000	83,672,000	184,297,000	103,810,000
Additions to property, plant, and equipment		186,691,000	251,200,000
Equity investment in investee	1,916,000	1,916,000	1,916,000	1,916,000
Goodwill	1,490,797,000	1,490,797,000	1,490,797,000	1,490,797,000
Total segment assets	7,235,697,000	6,879,566,000	7,235,697,000	6,879,566,000
EBITDA	177,830,000	165,230,000	451,183,000	373,645,000
Administrative and general	19,900,000	25,100,000	66,200,000	67,200,000
OTHER
Revenue
Base revenue	(186,000)	(186,000)	(558,000)	(2,695,000)
Fuel cost recovery revenue	0	0	0	0
Other operations	1,588,000	4,364,000	5,181,000	5,545,000
Affiliate revenue	19,595,000	22,733,000	57,020,000	80,156,000
Electric customer credits		0		0
Operating revenue, net	20,997,000	26,911,000	61,643,000	83,006,000
Depreciation and amortization	2,444,000	2,266,000	7,100,000	8,885,000
Interest income	2,704,000	5,326,000	8,066,000	7,432,000
Interest charges	11,453,000	12,445,000	33,814,000	45,768,000
Federal and state income tax expense (benefit)	(2,480,000)	(16,039,000)	(7,855,000)	(15,436,000)
Income (loss) from continuing operations, net of income taxes		10,178,000		(50,574,000)
Income from discontinued operations, net of income taxes		742,000		45,415,000
Net income	(7,869,000)	10,920,000	(23,828,000)	(5,159,000)
Additions to property, plant, and equipment		3,985,000	23,000
Equity investment in investee	(848,952,000)	(848,952,000)	(848,952,000)	(848,952,000)
Goodwill	0	0	0	0
Total segment assets	(324,086,000)	(286,556,000)	(324,086,000)	(286,556,000)
OTHER | CLECO POWER | Power supply agreements
Revenue
Amortization of intangible assets	200,000	200,000	600,000	2,700,000
ELIMINATIONS
Revenue
Base revenue	0	0	0	0
Fuel cost recovery revenue	0	0	0	0
Other operations	(9,000)	(13,000)	(28,000)	(12,000)
Affiliate revenue	(19,839,000)	(24,130,000)	(57,754,000)	(91,944,000)
Electric customer credits		0		0
Operating revenue, net	(19,848,000)	(24,143,000)	(57,782,000)	(91,956,000)
Depreciation and amortization	(1,000)	0	0	0
Interest income	(50,000)	(25,000)	(273,000)	(262,000)
Interest charges	(50,000)	(23,000)	(273,000)	(262,000)
Federal and state income tax expense (benefit)	0	0	0	0
Income (loss) from continuing operations, net of income taxes		0		0
Income from discontinued operations, net of income taxes		0		0
Net income	0	0	0	0
Additions to property, plant, and equipment		0	0
Equity investment in investee	848,952,000	848,952,000	848,952,000	848,952,000
Goodwill	0	0	0	0
Total segment assets	$ 786,653,000	$ 776,596,000	$ 786,653,000	$ 776,596,000