Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	$ 2,842,623	$ 3,099,914	$ 2,947,067	$ 2,954,156
Balances, end of period	2,889,530	2,978,446	2,889,530	2,978,446
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(363)	(23,615)	59	(23,629)
Balances, end of period	(786)	(23,608)	(786)	(23,608)
POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(363)	(23,615)	59	(23,629)
Amounts reclassified from AOCI	(423)	7	(845)	21
Balances, end of period	(786)	(23,608)	(786)	(23,608)
CLECO POWER
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	2,045,888	1,987,930	2,022,912	1,948,537
Balances, end of period	2,064,486	1,991,005	2,064,486	1,991,005
CLECO POWER | TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(8,206)	(17,814)	(8,365)	(18,183)
Balances, end of period	(8,047)	(17,444)	(8,047)	(17,444)
CLECO POWER | POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(3,222)	(12,579)	(3,318)	(12,885)
Amounts reclassified from AOCI	96	307	192	613
Balances, end of period	(3,126)	(12,272)	(3,126)	(12,272)
CLECO POWER | NET LOSS ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(4,984)	(5,235)	(5,047)	(5,298)
Amounts reclassified from AOCI	63	63	126	126
Balances, end of period	$ (4,921)	$ (5,172)	$ (4,921)	$ (5,172)