Pension Plan and Employee Benefits - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Jan. 31, 2025
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Estimated pension contributions through 2029					$ 76,100,000
Estimated pension contributions in 2025					$ 16,500,000	$ 5,000,000
Pension Plan | Other Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 200,000	$ 500,000	$ 500,000	$ 900,000
2025 Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Estimated pension contributions in 2025						$ 11,500,000
Other Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Assets held-in-trust, noncurrent	0		0
SERP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	789,000	796,000	1,579,000	1,590,000
CLECO POWER | Other Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	1,000,000.0	1,100,000	2,000,000	2,200,000
CLECO POWER | SERP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 100,000	$ 100,000	$ 200,000	$ 200,000