Income Taxes - Current and Deferred Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of Income Tax Expense [Line Items]
Current federal income tax (benefit) expense	$ (45,429)	$ 25,478	$ 26,173
Deferred federal income tax benefit	(7,137)	(9,835)	(44,464)
Amortization of accumulated deferred investment tax credits	(127)	(134)	(141)
Total federal income tax (benefit) expense	(52,693)	15,509	(18,432)
Current state income tax (benefit) expense	(9,787)	10,326	4,158
Deferred state income tax (benefit) expense	(2,593)	(5,800)	15,607
Total state income tax (benefit) expense	(12,380)	4,526	19,765
Total tax (benefit) expense	(65,073)	20,035	1,333
Items charged or credited directly to member’s equity
Total tax (benefit) expense from items charged directly to member’s equity	(1,905)	8,728	394
Total federal and state income tax (benefit) expense	(66,978)	28,763	1,727
Federal deferred income tax
Items charged or credited directly to member’s equity
Total tax (benefit) expense from items charged directly to member’s equity	(1,374)	6,297	514
State deferred income tax
Items charged or credited directly to member’s equity
Total tax (benefit) expense from items charged directly to member’s equity	(531)	2,431	(120)
CLECO POWER
Components of Income Tax Expense [Line Items]
Current federal income tax (benefit) expense	11,188	4,921	0
Deferred federal income tax benefit	(20,029)	(1,926)	(23,071)
Amortization of accumulated deferred investment tax credits	(127)	(134)	(142)
Total federal income tax (benefit) expense	(8,968)	2,861	(23,213)
Current state income tax (benefit) expense	5,617	2,406	0
Deferred state income tax (benefit) expense	(1,083)	(2,764)	13,860
Total state income tax (benefit) expense	4,534	(358)	13,860
Total tax (benefit) expense	(4,434)	2,503	(9,353)
Items charged or credited directly to member’s equity
Total tax (benefit) expense from items charged directly to member’s equity	(736)	3,618	2,052
Total federal and state income tax (benefit) expense	(5,170)	6,121	(7,301)
CLECO POWER | Federal deferred income tax
Items charged or credited directly to member’s equity
Total tax (benefit) expense from items charged directly to member’s equity	(528)	2,610	1,714
CLECO POWER | State deferred income tax
Items charged or credited directly to member’s equity
Total tax (benefit) expense from items charged directly to member’s equity	$ (208)	$ 1,008	$ 338