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Lease Commitments - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 16, 2019
MW
Dec. 31, 2016
MW
Aug. 31, 2016
MW
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Lessee, Lease, Description [Line Items]                
Unamortized cost of prepaid right-of-way agreements $ 60.2 $ 63.0            
Amortization of prepaid right-of-way agreements 3.7 $ 3.8 $ 3.5          
Operating leases, capitalized financing costs, investing activities 3.9              
Finance leases, capitalized financing costs, investing activities 0.7              
Lessee, operating lease, unguaranteed residual value 21.8              
Public Service Company of New Mexico                
Lessee, Lease, Description [Line Items]                
Operating leases, capitalized financing costs, investing activities 1.3              
Finance leases, capitalized financing costs, investing activities 0.3              
Lessee, operating lease, unguaranteed residual value 8.7              
Texas-New Mexico Power Company                
Lessee, Lease, Description [Line Items]                
Operating leases, capitalized financing costs, investing activities 2.6              
Finance leases, capitalized financing costs, investing activities 0.4              
Lessee, operating lease, unguaranteed residual value 13.1              
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              
Number of megawatts purchased (in megawatts) | MW           64.1    
Number of megawatts (in megawatts) | MW       114.6 114.6 114.6    
Palo Verde Nuclear Generating Station | Public Service Company of New Mexico                
Lessee, Lease, Description [Line Items]                
Lease covenant, restriction on conveying, transferring, leasing and dividends 5.00%              
Loss contingency, range of possible loss, portion not accrued $ 157.6              
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 $ 6.9              
New Mexico 2015 Rate Case | Palo Verde Nuclear Generating Station, Unit 2 | Public Service Company of New Mexico                
Lessee, Lease, Description [Line Items]                
Number of megawatts purchased (in megawatts) | MW 64.1     64.1        
Equipment                
Lessee, Lease, Description [Line Items]                
Operating lease, residual value of leased asset $ 1.9              
Equipment | Public Service Company of New Mexico                
Lessee, Lease, Description [Line Items]                
Operating lease, residual value of leased asset 0.7              
Equipment | Texas-New Mexico Power Company                
Lessee, Lease, Description [Line Items]                
Operating lease, residual value of leased asset $ 1.2