Discontinued Operations - Schedule of Reclassification of Continuing Operations to Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating revenue, net
Loss on classification as held for sale		$ (173,000)	$ 0	$ 0
Income (loss) from discontinued operations, net of income taxes		14,642	(44,337)	34,953
Discontinued Operations, Held-for-sale | Cleco Cajun Sale Group
Operating revenue, net
Electric operations		543,519	496,042	398,226
Other operations		125,816	148,823	128,750
Gross operating revenue		669,335	644,865	526,976
Electric customer credits		0	0	244
Operating revenue, net		669,335	644,865	527,220
Fuel used for electric generation		126,130	169,195	87,091
Purchased power		230,284	380,233	257,703
Other operations and maintenance		87,599	70,611	65,786
Depreciation and amortization		15,891	69,999	52,102
Taxes other than income taxes		13,160	12,330	11,666
Total operating expenses		473,064	702,368	474,348
Operating income (loss)		196,271	(57,503)	52,872
Other income, net		47	127
Other (expense), net				(618)
Interest, net		(6,919)	(6,079)	(5,523)
Loss on classification as held for sale	$ (19,000)	(173,000)	0	0
Income (loss) from discontinued operations before income taxes		16,399	(63,455)	46,731
Federal and state income tax expense (benefit)		1,757	(19,118)	11,778
Income (loss) from discontinued operations, net of income taxes		$ 14,642	$ (44,337)	$ 34,953