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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%