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Income Taxes (Details) - USD ($) $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 18, 2023 | Sep. 30, 2023 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |
Effective tax rate |  | 16.05% |
Income tax assessment |  | $ 0.3 |
Deferred federal, state and local, income taxes |  | 22.9 |
PNM |  |  |
Income Tax Contingency [Line Items] |  |  |
Proposed rate credits | $ 115.0 | $ 115.0 |
Effective tax rate |  | 18.90% |
Income tax assessment |  | $ 0.2 |
Deferred federal, state and local, income taxes |  | $ 14.3 |
TNMP |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective tax rate |  | 15.07% |
Income tax assessment |  | $ 0.1 |
Deferred federal, state and local, income taxes |  | $ 8.6 |
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 |  |  | 23 years

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