Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, Dec. 31, 2024	$ 2,841,014	$ 2,873,173
Balances, end of period	2,880,944	2,815,643
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, Dec. 31, 2024	(2,684)	(5,112)
Balances, end of period	(3,066)	(5,411)
POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, Dec. 31, 2024	(2,684)	(5,112)
Amounts reclassified from AOCI	(382)	(299)
Balances, end of period	(3,066)	(5,411)
CLECO POWER
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, Dec. 31, 2024	2,107,407	2,063,237
Balances, end of period	2,156,643	2,016,843
CLECO POWER | TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, Dec. 31, 2024	(10,099)	(10,351)
Balances, end of period	(9,880)	(10,097)
CLECO POWER | POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, Dec. 31, 2024	(5,457)	(5,555)
Amounts reclassified from AOCI	155	190
Balances, end of period	(5,302)	(5,365)
CLECO POWER | NET LOSS ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, Dec. 31, 2024	(4,642)	(4,796)
Amounts reclassified from AOCI	64	64
Balances, end of period	$ (4,578)	$ (4,732)