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Significant Accounting Policies and Responsibility for Financial Statements (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended
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Sep. 30, 2012 | Jun. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2012 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Jul. 31, 2011 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Jun. 30, 2011 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Apr. 30, 2011 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Mar. 31, 2011 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Jan. 31, 2011 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Dec. 31, 2010 Affiliated Entity [Member] Public Service Company of New Mexico [Member] | Sep. 30, 2012 Affiliated Entity [Member] Texas-New Mexico Power Company [Member] | Sep. 30, 2012 Affiliated Entity [Member] Texas-New Mexico Power Company [Member] | Sep. 30, 2011 Affiliated Entity [Member] Texas-New Mexico Power Company [Member] | Oct. 31, 2012 Dividend Paid [Member] Affiliated Entity [Member] Public Service Company of New Mexico [Member]
Common Stock, Dividends, Per Share, Declared | $ 0.145 | $ 0.145 | $ 0.125 | $ 0.125 | $ 0.435 | $ 0.375 |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  |  | $ 16.8 | $ 17.7 |  | $ 3.6 |  | $ 4.6 |  | $ 39.1 |  | $ 11.0 | $ 7.1 |
Payments of Dividends, Common Stock |  |  |  |  |  |  |  | $ 17.7 | $ 3.6 |  | $ 4.6 |  | $ 39.1 |  | $ 8.0 | $ 11.0 | $ 7.1 | $ 16.8

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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- Definition Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for common shareholders during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition Cash outflow in the form of ordinary dividends to common shareholders, generally out of earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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