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Stock-Based Compensation Plans (Performance Equity Plan/ Accounting for Stock Awards and ESPP) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 5.3 $ 3.6 $ 6.2
Public Service Company of New Mexico [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 3.8 2.7 4.3
Texas-New Mexico Power Company [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 1.5 1.0 1.4
Performance Equity Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Rate 100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Shares 12,340,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Shares 3,240,000    
Restricted Stock and Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 3.4    
Market-Based Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized $ 1.2    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (years) 1 year 8 months