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Electric Operating Revenues - Narrative (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) MW | Dec. 31, 2021 USD ($) | May 31, 2022 MW | Jan. 01, 2019 | Jan. 01, 2018 MW
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |  |
Allowance for credit loss | $ (2.3) | $ (1.1) |  |  |
Other receivables, allowance for credit loss | 0.0 | 1.0 |  |  |
Capitalized contract cost, amortization period |  |  |  | 5 years |
Contract assets | 11.9 | 0.6 |  |  |
Texas-New Mexico Power Company |  |  |  |  |
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |  |
Regulatory assets from defaulting REP's | $ 0.8 |  |  |  |
Public Service Company of New Mexico |  |  |  |  |
Contract with Customers, Asset and Liability [Roll Forward] |  |  |  |  |
Expected exposure to market risk (in megawatts) | MW | 65 |  |  |  | 65
Power to be sold to third party (in megawatts) | MW | 36 |  | 50 |  | 36
Contract with customers, net | $ 151.4 | $ 94.9 |  |  |

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