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Regulatory and Rate Matters - TNMP Narrative (Details) customer in Thousands, $ in Millions			9 Months Ended
	Jul. 31, 2025 USD ($)	Jul. 08, 2024 customer	Sep. 30, 2025 USD ($)	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						$ 34.6
Consultant fees						7.5
Capital projects						24.7
Offset related interest expense						2.1
Other related expenses						$ 0.3
Texas-New Mexico Power Company
Public Utilities, General Disclosures [Line Items]
Distribution revenue requirement	$ 5.4
Requested increase annual distribution revenue requirement	$ 27.9
Energy efficiency cost recovery				$ 8.1				$ 7.0
Energy efficiency cost recovery factor, performance bonus				$ 2.5				$ 1.3
Texas-New Mexico Power Company | System Resiliency Plan
Public Utilities, General Disclosures [Line Items]
Regulatory asset, total cost			$ 3.3
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			54.0
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			33.5
Texas-New Mexico Power Company | Hurricane | Other Deferred Charges
Public Utilities, General Disclosures [Line Items]
Incurred cost without power due to natural disaster			20.5
Texas-New Mexico Power Company | Public Utility Commission Of Texas
Public Utilities, General Disclosures [Line Items]
Regulatory asset, total cost			$ 2.2

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