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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	Sep. 01, 2023	Sep. 01, 2022	Sep. 01, 2021
Public Utilities, General Disclosures [Line Items]
Approved Increase in Rate Base		$ 95.7	$ 104.5
Annual Increase in Revenue		$ 6.8	$ 13.5
Subsequent event
Public Utilities, General Disclosures [Line Items]
Approved Increase in Rate Base	$ 157.0
Annual Increase in Revenue	$ 14.5

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

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