Intangible Assets and Goodwill - Schedule of Securitized Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Total securitized intangible assets carrying value	$ 714,931	$ 415,946
Accumulated amortization	(48,309)	(31,038)
Net securitized intangible assets subject to amortization	666,622	384,908
CLECO POWER
Finite-Lived Intangible Assets [Line Items]
Total securitized intangible assets carrying value	714,931	415,946
Accumulated amortization	(48,309)	(31,038)
Net securitized intangible assets subject to amortization	666,622	384,908
Storm Recovery Property
Finite-Lived Intangible Assets [Line Items]
Total securitized intangible assets carrying value	415,593	415,946
Net securitized intangible assets subject to amortization	373,822	384,908
Storm Recovery Property | CLECO POWER
Finite-Lived Intangible Assets [Line Items]
Total securitized intangible assets carrying value	415,593	415,946
Net securitized intangible assets subject to amortization	373,822	384,908
Energy Transition Property
Finite-Lived Intangible Assets [Line Items]
Total securitized intangible assets carrying value	299,338	0
Net securitized intangible assets subject to amortization	292,800	0
Energy Transition Property | CLECO POWER
Finite-Lived Intangible Assets [Line Items]
Total securitized intangible assets carrying value	299,338	0
Net securitized intangible assets subject to amortization	$ 292,800	$ 0