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Income Taxes (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |
Effective tax rate | 15.44% |
Regulatory disallowances, tax effect | $ 2.7 |
Sale of equity method investee, tax effect | 19.5 |
Income tax assessment | 0.1 |
Deferred federal, state and local, income taxes | $ 23.3 |
NMPRC |  |
Income Tax Contingency [Line Items] |  |
Period of time for proposed return to customers the benefit of the reduction in federal corporate income tax rate | 5 years | 23 years
Unprotected excess deferred income taxes | $ 62.7 |
PNM |  |
Income Tax Contingency [Line Items] |  |
Effective tax rate | 14.66% |
Income tax assessment | $ 0.1 |
Deferred federal, state and local, income taxes | $ 20.7 |
TNMP |  |
Income Tax Contingency [Line Items] |  |
Effective tax rate | 20.67% |
Income tax assessment | $ 0.1 |
Deferred federal, state and local, income taxes | $ 2.6 |

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