Commitments and Contingencies - San Juan County Decommissioning Ordinance (Details) - Coal-Fired Electricity Generating Facility Demolition And Remediation Ordinance - San Juan Generating Station - Public Service Company of New Mexico - USD ($) $ in Millions	Nov. 09, 2021	Dec. 31, 2022	Sep. 30, 2022
Public Utilities, General Disclosures [Line Items]
Initial funding requirement	$ 14.7
Surety bond		$ 46.0
Decrease in decommissioning obligation			$ 21.1