Discontinued Operations - Schedule of Reclassification of Continuing Operations to Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on classification as held for sale	$ (17,000)	$ (96,000)
Income from discontinued operations, net of income taxes	31,962	19,053
Discontinued Operations, Held-for-sale | CLECO CAJUN
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Electric operations	128,828	108,761
Other operations	31,534	34,714
Operating revenue, net	160,362	143,475
Fuel used for electric generation*	15,196	10,232
Purchased power	61,940	60,625
Other operations and maintenance	23,291	23,370
Depreciation and amortization	356	14,513
Total operating expenses	100,783	108,740
Operating income	59,579	34,735
Other income, net	126	134
Interest, net	(80)	(1,786)
Loss on classification as held for sale	(17,000)	(96,000)
Income (loss) from discontinued operations before income taxes	42,625	(62,917)
Federal and state income tax expense (benefit)	10,663	(81,970)
Income from discontinued operations, net of income taxes	$ 31,962	19,053
Discontinued Operations, Held-for-sale | CLECO CAJUN | Natural gas derivatives
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Federal and state income tax expense (benefit)		64,700
Net loss recognized in income on derivatives		$ 56,500