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Lease Commitments (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2015
USD ($)
MW
Jan. 14, 2016
USD ($)
Jun. 01, 2014
USD ($)
May. 01, 2014
MW
Public Service Company of New Mexico [Member]        
Operating Leased Assets [Line Items]        
Public Utilities, Option to Purchase Leased Capacity At Fair Value $ 7.7      
Public Service Company of New Mexico [Member] | TGP Granada, LLC and its affiliate Complaint [Member]        
Operating Leased Assets [Line Items]        
Public Utilities, Lease ownership percentage in EIP 60.00%      
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 31.2494 MW [Member]        
Operating Leased Assets [Line Items]        
Purchase Price of Leased Asset to be paid $ 78.1      
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases [Member]        
Operating Leased Assets [Line Items]        
Leased Capacity to be Purchased | MW       32.76
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016 [Member]        
Operating Leased Assets [Line Items]        
Leased Capacity to be Purchased | MW 31.25      
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member]        
Operating Leased Assets [Line Items]        
Purchase Price of Leased Asset to be paid $ 85.2      
Early Purchase Price of Leased Asset, Period 1     $ 79.9  
Early Purchase Price of Leased Asset 83.4      
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Maximum [Member]        
Operating Leased Assets [Line Items]        
Additional consideration for early purchase of leased asset, Period 1     $ 5.8  
Additional consideration for early purchase of leased asset, Period 2 $ 2.8      
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Subsequent Event [Member]        
Operating Leased Assets [Line Items]        
Purchase Price of Leased Asset, Period 3   $ 85.2    
Public Service Company of New Mexico [Member] | Palo Verde Nuclear Generating Station, Unit 2 Leases 32.76 MW [Member] | Subsequent Event [Member] | Minimum [Member]        
Operating Leased Assets [Line Items]        
Additional consideration for early purchase of leased asset effective June 1, 2014   $ 1.2    
Tortoise Capital Resources Corporation [Member] | TGP Granada, LLC and its affiliate Complaint [Member]        
Operating Leased Assets [Line Items]        
Public Utilities, Lease ownership percentage in EIP 40.00%