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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2013 | Jun. 30, 2013
Income Tax Contingency [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Decrease |  | $ 1.5
New Mexico Corporate tax rate, current |  | 7.60%
New Mexico Corporate tax rate, 2014 |  | 5.90%
Increase in regulatory liabilities due to change in state corporate tax rate |  | 23.9
Increase in income tax expense due to change in state corporate tax rate |  | 1.2
Additional Income Tax Expense, Impairment of NM Wind Credits |  | 2.4
Federal Tax Refund | 96.2 |
Public Service Company of New Mexico [Member] |  |
Income Tax Contingency [Line Items] |  |
Federal Tax Refund | 77.4 |
PNMR to PNM [Member] |  |
Income Tax Contingency [Line Items] |  |
Federal Income Tax Refund Transferred to Related Party |  | $ 45.0

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- Details
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