Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 2,954,156	$ 2,757,023	$ 2,643,006
Other comprehensive income before reclassifications
Balance, end of period	2,947,067	2,954,156	2,757,023
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(23,629)	(25,796)	(17,513)
Other comprehensive income before reclassifications
Balance, end of period	59	(23,629)	(25,796)
POSTRETIREMENT BENEFIT NET GAIN (LOSS)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(23,629)	(25,796)	(17,513)
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	23,647	1,470	(10,026)
Amounts reclassified from accumulated other comprehensive loss	41	697	1,743
Balance, end of period	59	(23,629)	(25,796)
Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	1,948,537	1,807,879	1,713,392
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	8,339	4,606	(4,050)
Balance, end of period	2,022,912	1,948,537	1,807,879
Cleco Power | TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(18,183)	(24,753)	(22,585)
Other comprehensive income before reclassifications
Balance, end of period	(8,365)	(18,183)	(24,753)
Cleco Power | POSTRETIREMENT BENEFIT NET GAIN (LOSS)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(12,885)	(19,139)	(16,717)
Other comprehensive income before reclassifications
Postretirement benefit adjustments incurred during the year	8,339	4,606	(4,050)
Amounts reclassified from accumulated other comprehensive loss	1,228	1,648	1,628
Balance, end of period	(3,318)	(12,885)	(19,139)
Cleco Power | NET (LOSS) GAIN ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,298)	(5,614)	(5,868)
Other comprehensive income before reclassifications
Amounts reclassified from accumulated other comprehensive loss	(251)	(316)	(254)
Balance, end of period	$ (5,047)	$ (5,298)	$ (5,614)