Pension Plan and Employee Benefits - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated pension contributions through 2027					$ 74,500,000
Estimated pension contributions in 2024	$ 25,700,000		$ 25,700,000
Pension Plan | Other Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	400,000	$ 700,000	1,200,000	$ 2,100,000
Other Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Assets held-in-trust, noncurrent	0		0
Other Benefits Plan | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	900,000	1,100,000	2,600,000	3,300,000
SERP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	866,000	935,000	2,601,000	2,805,000
SERP | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 100,000	$ 100,000	$ 400,000	$ 400,000