Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	$ 2,978,446	$ 2,856,380	$ 2,954,156	$ 2,757,023
Balances, end of period	2,960,078	2,976,386	2,960,078	2,976,386
TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(23,608)	(25,588)	(23,629)	(25,796)
Balances, end of period	(23,598)	(25,492)	(23,598)	(25,492)
POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(23,608)	(25,588)	(23,629)	(25,796)
Amounts reclassified from AOCI	10	96	31	304
Balances, end of period	(23,598)	(25,492)	(23,598)	(25,492)
CLECO POWER
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	1,991,005	1,854,598	1,948,537	1,807,879
Balances, end of period	1,978,608	1,911,572	1,978,608	1,911,572
CLECO POWER | TOTAL AOCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(17,444)	(23,880)	(18,183)	(24,753)
Balances, end of period	(17,074)	(23,467)	(17,074)	(23,467)
CLECO POWER | POSTRETIREMENT BENEFIT NET LOSS
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(12,272)	(18,394)	(12,885)	(19,139)
Amounts reclassified from AOCI	307	350	920	1,095
Balances, end of period	(11,965)	(18,044)	(11,965)	(18,044)
CLECO POWER | NET LOSS ON CASH FLOW HEDGES
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances, beginning of period	(5,172)	(5,486)	(5,298)	(5,614)
Amounts reclassified from AOCI	63	63	189	191
Balances, end of period	$ (5,109)	$ (5,423)	$ (5,109)	$ (5,423)