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Lease Commitments - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Lessee, Lease, Description [Line Items]          
Unamortized cost of prepaid right-of-way agreements $ 55.8 $ 60.2      
Amortization of prepaid right-of-way agreements 4.4 3.7 $ 3.8    
Operating leases, capitalized financing costs, investing activities 3.4 3.9      
Finance leases, capitalized financing costs, investing activities 2.8 0.7      
Lessee, operating lease, unguaranteed residual value 26.7        
Public Service Company of New Mexico          
Lessee, Lease, Description [Line Items]          
Operating leases, capitalized financing costs, investing activities 1.0 1.3      
Finance leases, capitalized financing costs, investing activities 1.1 0.3      
Lessee, operating lease, unguaranteed residual value 11.0        
Texas-New Mexico Power Company          
Lessee, Lease, Description [Line Items]          
Operating leases, capitalized financing costs, investing activities 2.4 2.6      
Finance leases, capitalized financing costs, investing activities 1.8 $ 0.4      
Lessee, operating lease, unguaranteed residual value 15.6        
Palo Verde Nuclear Generating Station, Units 1 And 4 | Public Service Company of New Mexico          
Lessee, Lease, Description [Line Items]          
Number of leases expiring | lease         4
Number of leases under which lease term was extended | lease         4
Annual lease payments during renewal period 16.5        
Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico          
Lessee, Lease, Description [Line Items]          
Number of leases expiring | lease       4  
Number of leases under which lease term was extended | lease       1  
Annual lease payments during renewal period 1.6        
Palo Verde Nuclear Generating Station | Public Service Company of New Mexico          
Lessee, Lease, Description [Line Items]          
Loss contingency, range of possible loss, portion not accrued 154.5        
Navajo Nation | Public Service Company of New Mexico          
Lessee, Lease, Description [Line Items]          
Right-of-way lease, annual payments 6.0        
Right-of-way lease, payments 7.1        
Equipment          
Lessee, Lease, Description [Line Items]          
Operating lease, residual value of leased asset 2.3        
Equipment | Public Service Company of New Mexico          
Lessee, Lease, Description [Line Items]          
Operating lease, residual value of leased asset 0.9        
Equipment | Texas-New Mexico Power Company          
Lessee, Lease, Description [Line Items]          
Operating lease, residual value of leased asset $ 1.4