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Regulatory and Rate Matters - TNMP Narrative (Details) customer in Thousands, $ in Millions				3 Months Ended
	Mar. 14, 2025 USD ($)	Jul. 08, 2024 customer	Sep. 28, 2023 USD ($)	Mar. 31, 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
Requested increase annual distribution revenue requirement	$ 25.0
Incremental distribution investments	$ 176.6
Texas-New Mexico Power Company
Public Utilities, General Disclosures [Line Items]
Energy efficiency cost recovery factor, recovery			$ 6.6
Energy efficiency cost recovery factor, approved performance bonus			$ 1.2					$ 1.3
Energy efficiency cost recovery, requested bonus								$ 7.0
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				$ 53.2
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				32.4
Texas-New Mexico Power Company | Hurricane | Other Deferred Charges
Public Utilities, General Disclosures [Line Items]
Incurred cost without power due to natural disaster				$ 20.8

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