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Lease Commitments - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 02, 2021
lease
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Lessee, Lease, Description [Line Items]            
Unamortized cost of prepaid right-of-way agreements $ 53.4 $ 55.8        
Amortization of prepaid right-of-way agreements 3.7 $ 4.4 $ 3.7      
Lessee, operating lease, unguaranteed residual value 25.8          
Public Service Company of New Mexico            
Lessee, Lease, Description [Line Items]            
Number of leases under which lease term was extended | lease       5    
Lessee, operating lease, unguaranteed residual value 11.3          
Texas-New Mexico Power Company            
Lessee, Lease, Description [Line Items]            
Lessee, operating lease, unguaranteed residual value 14.5          
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 148.4          
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 7.3          
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