Pension Plan and Employee Benefits - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 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
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
Other Benefits Plan | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	1,000,000.0	1,100,000
SERP
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	789,000	795,000
SERP | CLECO POWER
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer	$ 100,000	$ 100,000