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Regulatory and Rate Matters - TNMP Narrative (Details) customer in Thousands, $ in Millions				6 Months Ended
	Jul. 31, 2025 USD ($)	Jul. 24, 2025 USD ($)	Jul. 08, 2024 customer	Jun. 30, 2025 USD ($)	May 30, 2025 USD ($)	Mar. 26, 2025 USD ($)	Mar. 12, 2025 USD ($)	Dec. 11, 2024 USD ($)	Oct. 24, 2024 USD ($)	Aug. 28, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Sales and use tax refund							$ 33.6
Texas-New Mexico Power Company
Public Utilities, General Disclosures [Line Items]
Energy efficiency cost recovery					$ 8.1				$ 7.0
Energy efficiency cost recovery factor, performance bonus					$ 2.5				$ 1.3
Texas-New Mexico Power Company | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Transmission base rate		$ 87.4
Requested increase annual transmission rate		$ 12.3
Distribution revenue requirement	$ 5.4
Requested increase annual distribution revenue requirement	$ 27.9
Texas-New Mexico Power Company | System Resiliency Plan
Public Utilities, General Disclosures [Line Items]
Capital investment						$ 545.8		$ 565.8		$ 600.0
Cost related to investment						$ 86.1		$ 128.2		$ 151.0
Investment owned, net assets, percentage								94.00%
Texas-New Mexico Power Company | Hurricane
Public Utilities, General Disclosures [Line Items]
Number of customers without power | customer			116
Incurred cost without power due to natural disaster				$ 53.8
Texas-New Mexico Power Company | Hurricane | Public Utilities, Property, Plant and Equipment, Plant in Service
Public Utilities, General Disclosures [Line Items]
Incurred cost without power due to natural disaster				33.4
Texas-New Mexico Power Company | Hurricane | Other Deferred Charges
Public Utilities, General Disclosures [Line Items]
Incurred cost without power due to natural disaster				20.4
Texas-New Mexico Power Company | Public Utility Commission Of Texas
Public Utilities, General Disclosures [Line Items]
Regulatory asset, total cost				$ 0.6

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