Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 2,947,067	$ 2,954,156	$ 2,757,023
Other comprehensive income before reclassifications
Balance, end of period	2,873,173	2,947,067	2,954,156
Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	2,022,912	1,948,537	1,807,879
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	(2,623)	8,339	4,606
Balance, end of period	2,063,237	2,022,912	1,948,537
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	59	(23,629)	(25,796)
Other comprehensive income before reclassifications
Balance, end of period	(5,112)	59	(23,629)
TOTAL AOCI | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(8,365)	(18,183)	(24,753)
Other comprehensive income before reclassifications
Balance, end of period	(10,351)	(8,365)	(18,183)
POSTRETIREMENT BENEFIT NET GAIN (LOSS)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	59	(23,629)	(25,796)
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	(3,482)	23,647	1,470
Amounts reclassified from accumulated other comprehensive loss	(1,689)	41	697
Balance, end of period	(5,112)	59	(23,629)
POSTRETIREMENT BENEFIT NET GAIN (LOSS) | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(3,318)	(12,885)	(19,139)
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	(2,623)	8,339	4,606
Amounts reclassified from accumulated other comprehensive loss	386	1,228	1,648
Balance, end of period	(5,555)	(3,318)	(12,885)
NET (LOSS) GAIN ON CASH FLOW HEDGES | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,047)	(5,298)	(5,614)
Other comprehensive income before reclassifications
Amounts reclassified from accumulated other comprehensive loss	(251)	(251)	(316)
Balance, end of period	$ (4,796)	$ (5,047)	$ (5,298)