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Regulatory and Rate Matters - Schedule of Interim Distribution Rate Increases (Details) - Texas-New Mexico Power Company - Periodic Distribution Rate Adjustment - USD ($) $ in Millions	Jun. 29, 2025	Nov. 17, 2024	Jul. 28, 2024	Sep. 01, 2023
Public Utilities, General Disclosures [Line Items]
Approved Increase in Rate Base	$ 176.6	$ 43.7	$ 205.9	$ 157.0
Annual Increase in Revenue	$ 25.0	$ 7.7	$ 15.6	$ 14.5

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Public Utilities, Actual Annual Increase Annual Distribution Revenue Requirement

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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