Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 2,873,173	$ 2,947,067	$ 2,954,156
Other comprehensive income before reclassifications
Balance, end of period	2,841,014	2,873,173	2,947,067
Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	2,063,237	2,022,912	1,948,537
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	(559)	(2,623)	8,339
Balance, end of period	2,107,407	2,063,237	2,022,912
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,112)	59	(23,629)
Other comprehensive income before reclassifications
Balance, end of period	(2,684)	(5,112)	59
TOTAL AOCI | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(10,351)	(8,365)	(18,183)
Other comprehensive income before reclassifications
Balance, end of period	(10,099)	(10,351)	(8,365)
POSTRETIREMENT BENEFIT NET GAIN (LOSS)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,112)	59	(23,629)
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	3,603	(3,482)	23,647
Amounts reclassified from AOCI	(1,175)	(1,689)	41
Balance, end of period	(2,684)	(5,112)	59
POSTRETIREMENT BENEFIT NET GAIN (LOSS) | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,555)	(3,318)	(12,885)
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	(559)	(2,623)	8,339
Amounts reclassified from AOCI	657	386	1,228
Balance, end of period	(5,457)	(5,555)	(3,318)
NET (LOSS) GAIN ON CASH FLOW HEDGES | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(4,796)	(5,047)	(5,298)
Other comprehensive income before reclassifications
Amounts reclassified from AOCI	154	251	251
Balance, end of period	$ (4,642)	$ (4,796)	$ (5,047)