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Pension and Other Postretirement Benefits Narrative (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected return on plan assets |  | 4.00% |  |
Defined Benefit Plans, Gains and losses that lie outside the corridor, amortized (in years) |  | 5 years |  |
Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected long-term return resulting from effect of one-percentage point decrease (as a percent) |  | 1.00% |  |
Expected long-term return resulting from effect of one-percentage point increase (as a percent) |  | 1.00% |  |
Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected long-term return resulting from effect of one-percentage point decrease (as a percent) |  | 1.00% |  |
Public Service Company of New Mexico [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected return on plan assets |  | 7.65% | 8.25% | 8.50%
Defined Benefit Plan, Other Changes |  | $ (60.9) | $ 86.4 |
Defined Benefit Plan, Actuarial Gain (Loss) resulting from changes in demographics and other trends |  | (4.4) | (8.0) |
Actual plan asset allocations (as a percent) |  | 3.50% |  |
Expected Long-term return on assets decrease resulting in increase net periodic costs In next fiscal year |  | 5.3 |  |
Estimated future employer contributions from 2013-2017 |  | 61.5 |  |
Public Service Company of New Mexico [Member] | Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected return on plan assets |  | 8.50% | 8.50% | 8.50%
Defined Benefit Plan, Other Changes | (8.8) |  | 13.1 |
Defined Benefit Plan, Actuarial Gain (Loss) resulting from changes in demographics and other trends | (4.2) |  | 8.1 |
Actual plan asset allocations (as a percent) |  | 20.40% |  |
Expected Long-term return on assets decrease resulting in increase net periodic costs In next fiscal year |  | 0.7 |  |
Estimated future employer contributions in next fiscal year |  | 3.5 |  |
Texas-New Mexico Power Company [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected return on plan assets |  | 7.65% | 8.25% | 8.50%
Defined Benefit Plan, Other Changes |  | (6.4) | 10.7 |
Defined Benefit Plan, Actuarial Gain (Loss) resulting from changes in demographics and other trends |  | 1.4 | (0.8) |
Actual plan asset allocations (as a percent) |  | 6.70% |  |
Expected Long-term return on assets decrease resulting in increase net periodic costs In next fiscal year |  | 0.7 |  |
Estimated future employer contributions from 2013-2017 |  | 0 |  |
Texas-New Mexico Power Company [Member] | Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expected return on plan assets |  | 6.50% | 6.50% | 6.30%
Defined Benefit Plan, Other Changes | (1.3) |  | 2.0 |
Defined Benefit Plan, Actuarial Gain (Loss) resulting from changes in demographics and other trends | (0.2) |  | (0.8) |
Actual plan asset allocations (as a percent) |  | 22.10% |  |
Expected Long-term return on assets decrease resulting in increase net periodic costs In next fiscal year |  | 0.1 |  |
Estimated future employer contributions in next fiscal year |  | $ 0.3 |  |
Equity Securities [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations (as a percent) |  | 21.00% |  |
Equity Securities [Member] | Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations (as a percent) |  | 70.00% |  |
Debt Securities [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations (as a percent) |  | 65.00% |  |
Debt Securities [Member] | Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations (as a percent) |  | 30.00% |  |
Alternative Investments [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations (as a percent) |  | 14.00% |  |
Minimum [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Weighted average discount rate related to anticipated contributions (as a percent) |  | 5.20% |  |
Maximum [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Weighted average discount rate related to anticipated contributions (as a percent) |  | 5.50% |  |
Developed Countries Outside of United States [Member] | Equity Securities [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target plan asset allocations (as a percent) |  | 6.00% |  |

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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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