Pension Plan and Employee Benefits - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 31, 2025	Jul. 31, 2024	Apr. 30, 2024
PENSION BENEFITS
Defined Benefit Plan Disclosure [Line Items]
Consecutive calendar years		5 years
Most recent period of employment		10 years
Estimated pension contributions required through 2029		$ 76,100,000
Estimated pension contributions required through next year		16,500,000				$ 7,100,000	$ 3,500,000
Net actuarial (gain) loss occurring during period		$ (6,310,000)	$ 17,082,000
Discount rate		5.13%	5.44%	2.98%
Expected return on plan assets		6.68%	6.60%	5.25%
Actual return on plan assets		1.90%	9.23%
SERP net actuarial gain		$ 25,647,000	$ (26,300,000)
PENSION BENEFITS | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Estimated pension contributions required through next year					$ 5,000,000
PENSION BENEFITS | Forecast
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.66%
Expected return on plan assets	7.07%
Increase in expected pension costs	$ 2,500,000
PENSION BENEFITS | Other Subsidiaries
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		1,800,000	1,900,000	$ 3,200,000
2025 Pension Plans Defined Benefit | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Estimated pension contributions required through next year					$ 11,500,000
2023 Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Estimated pension contributions required through next year						$ 15,200,000
OTHER BENEFITS
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss occurring during period		(1,964,000)	$ 5,110,000
Assets set aside in a trust		$ 0
Discount rate		5.25%	5.61%	2.82%
Assumed health care cost trend rates for next fiscal year		5.00%
Assumed health care cost trend rates thereafter next fiscal year		5.00%
Ultimate health care trend rate		5.00%
SERP net actuarial gain		$ 2,011,000	$ 5,110,000
OTHER BENEFITS | Cleco Power
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		4,300,000	3,500,000	$ 4,400,000
SERP BENEFITS
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss occurring during period		(2,814,000)	(345,000)
Net periodic benefit cost		$ 3,181,000	$ 3,468,000	$ 3,740,000
Discount rate		5.13%	5.46%	2.95%
SERP net actuarial gain		$ 2,814,000	$ 345,000
SERP BENEFITS | Cleco Power
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost		$ 500,000	$ 500,000	$ 600,000