Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	$ 2,873,173	$ 2,947,067
Balances, end of period	2,815,643	2,842,623
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(5,112)	59
Balances, end of period	(5,411)	(363)
POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(5,112)	59
Amounts reclassified from AOCI	(299)	(422)
Balances, end of period	(5,411)	(363)
CLECO POWER
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	2,063,237	2,022,912
Balances, end of period	2,016,843	2,045,888
CLECO POWER | TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(10,351)	(8,365)
Balances, end of period	(10,097)	(8,206)
CLECO POWER | POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(5,555)	(3,318)
Amounts reclassified from AOCI	190	96
Balances, end of period	(5,365)	(3,222)
CLECO POWER | NET LOSS ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(4,796)	(5,047)
Amounts reclassified from AOCI	64	63
Balances, end of period	$ (4,732)	$ (4,984)