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Regulatory and Rate Matters - Schedule of Rate Increases for Transmission Costs (Details) - TNMP - USD ($) $ in Millions	Nov. 17, 2024	Oct. 24, 2024	Sep. 20, 2024	Jul. 28, 2024	Mar. 15, 2024	Mar. 01, 2024	Sep. 06, 2023	Sep. 01, 2023	May 12, 2023	Mar. 01, 2023	Sep. 22, 2022	Sep. 01, 2022	Mar. 25, 2022	Mar. 01, 2022
Periodic Distribution Rate
Public Utilities, General Disclosures [Line Items]
Approved Increase in Rate Base	$ 43.7			$ 205.9				$ 157.0				$ 95.7
Actual annual increase annual distribution revenue requirement.	$ 7.7			$ 15.6				$ 14.5				$ 6.8
PUCT
Public Utilities, General Disclosures [Line Items]
Approved Increase in Rate Base			$ 20.6		$ 97.4		$ 21.4		$ 150.5		$ 36.0		$ 95.6
Annual Increase in Revenue			$ 3.9		$ 13.1		$ 4.2		$ 19.4		$ 5.3		$ 14.2
Energy efficiency costs
Public Utilities, General Disclosures [Line Items]
Aggregate Collection Amount						$ 6.6				$ 7.3				$ 7.2
Performance Bonus		$ 1.3				$ 1.2				$ 1.9				$ 2.3

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