Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	$ 2,880,944	$ 2,815,643	$ 2,841,014	$ 2,873,173
Balances, end of period	2,928,460	2,856,789	2,928,460	2,856,789
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(3,066)	(5,411)	(2,684)	(5,112)
Balances, end of period	(3,447)	(5,555)	(3,447)	(5,555)
POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(3,066)	(5,411)	(2,684)	(5,112)
Amounts reclassified from AOCI	(381)	(144)	(763)	(443)
Balances, end of period	(3,447)	(5,555)	(3,447)	(5,555)
CLECO POWER
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	2,156,643	2,016,843	2,107,407	2,063,237
Balances, end of period	2,212,011	2,043,852	2,212,011	2,043,852
CLECO POWER | TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(9,880)	(10,097)	(10,099)	(10,351)
Balances, end of period	(9,663)	(9,874)	(9,663)	(9,874)
CLECO POWER | POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(5,302)	(5,365)	(5,457)	(5,555)
Amounts reclassified from AOCI	154	161	309	351
Balances, end of period	(5,148)	(5,204)	(5,148)	(5,204)
CLECO POWER | NET LOSS ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(4,578)	(4,732)	(4,642)	(4,796)
Amounts reclassified from AOCI	63	62	127	126
Balances, end of period	$ (4,515)	$ (4,670)	$ (4,515)	$ (4,670)