Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 2,841,014	$ 2,873,173	$ 2,947,067
Other comprehensive income (loss) before reclassifications
Balance, end of period	3,029,426	2,841,014	2,873,173
Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	2,107,407	2,063,237	2,022,912
Other comprehensive income (loss) before reclassifications
Postretirement benefit adjustments incurred during the year	(3,652)	(559)	(2,623)
Balance, end of period	2,262,727	2,107,407	2,063,237
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,684)	(5,112)	59
Other comprehensive income (loss) before reclassifications
Balance, end of period	(9,482)	(2,684)	(5,112)
TOTAL AOCI | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(10,099)	(10,351)	(8,365)
Other comprehensive income (loss) before reclassifications
Balance, end of period	(12,880)	(10,099)	(10,351)
POSTRETIREMENT BENEFIT NET GAIN (LOSS)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(2,684)	(5,112)	59
Other comprehensive income (loss) before reclassifications
Postretirement benefit adjustments incurred during the year	(5,271)	3,603	(3,482)
Amounts reclassified from AOCI	(1,527)	(1,175)	(1,689)
Balance, end of period	(9,482)	(2,684)	(5,112)
POSTRETIREMENT BENEFIT NET GAIN (LOSS) | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(5,457)	(5,555)	(3,318)
Other comprehensive income (loss) before reclassifications
Postretirement benefit adjustments incurred during the year	(3,652)	(559)	(2,623)
Amounts reclassified from AOCI	615	657	386
Balance, end of period	(8,494)	(5,457)	(5,555)
NET (LOSS) GAIN ON CASH FLOW HEDGES | Cleco Power
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(4,642)	(4,796)	(5,047)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from AOCI	256	154	251
Balance, end of period	$ (4,386)	$ (4,642)	$ (4,796)