Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	$ 2,947,067	$ 2,954,156
Balances, end of period	2,842,623	3,099,914
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	59	(23,629)
Balances, end of period	(363)	(23,615)
POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	59	(23,629)
Amounts reclassified from AOCI	(422)	14
Balances, end of period	(363)	(23,615)
CLECO POWER
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	2,022,912	1,948,537
Balances, end of period	2,045,888	1,987,930
CLECO POWER | TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(8,365)	(18,183)
Balances, end of period	(8,206)	(17,814)
CLECO POWER | POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(3,318)	(12,885)
Amounts reclassified from AOCI	96	306
Balances, end of period	(3,222)	(12,579)
CLECO POWER | NET LOSS ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(5,047)	(5,298)
Amounts reclassified from AOCI	63	63
Balances, end of period	$ (4,984)	$ (5,235)