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Income Taxes (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |
Effective tax rate | 15.68% |
Income tax assessment | $ 0.3 |
Deferred federal, state and local, income taxes | $ 22.9 |
PNM |  |
Income Tax Contingency [Line Items] |  |
Effective tax rate | 18.69% |
Income tax assessment | $ 0.2 |
Deferred federal, state and local, income taxes | $ 14.3 |
TNMP |  |
Income Tax Contingency [Line Items] |  |
Effective tax rate | 14.72% |
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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- Definition Amount of deferred federal, state, and local tax expense (benefit) attributable to income (loss) from continuing operations. Includes, but is not limited to, deferred national, regional, territorial, and provincial tax expense (benefit) for non-US (United States of America) jurisdiction. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-10 + Details
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