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Lease Commitments - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Apr. 02, 2021
lease
Dec. 31, 2020
USD ($)
Jan. 15, 2016
lease
Jan. 15, 2015
lease
Operating Leased Assets [Line Items]                  
Operating lease, payments to lessor upon occurrence of certain events   $ 146.5   $ 146.5          
Unamortized cost, right-of-way lease payments   54.8   54.8     $ 55.8    
Operating lease, right-of-use assets, amortization expense   0.9 $ 0.9 1.9 $ 1.9        
Operating leases, capitalized financing costs, investing activities   1.8 1.8 1.8 1.8        
Finance leases, capitalized financing costs, investing activities   3.6 1.1 3.6 1.1        
Lessee, operating lease, unguaranteed residual value   25.7   25.7          
PNM                  
Operating Leased Assets [Line Items]                  
Number of leases under which lease term was extended | lease           5      
Operating leases, capitalized financing costs, investing activities   0.6 0.5 0.6 0.5        
Finance leases, capitalized financing costs, investing activities   1.2 0.4 1.2 0.4        
Lessee, operating lease, unguaranteed residual value   10.9   10.9          
PNM | Palo Verde Nuclear Generating Station, Unit 1 and 4 Leases                  
Operating Leased Assets [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          
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases                  
Operating Leased Assets [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          
PNM | Navajo Nation                  
Operating Leased Assets [Line Items]                  
Annual lease payments       6.0          
Right-of-way lease payments $ 7.3                
TNMP                  
Operating Leased Assets [Line Items]                  
Operating leases, capitalized financing costs, investing activities   1.2 1.2 1.2 1.2        
Finance leases, capitalized financing costs, investing activities   2.4 $ 0.7 2.4 $ 0.7        
Lessee, operating lease, unguaranteed residual value   14.9   14.9          
Equipment                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset   2.3   2.3          
Equipment | PNM                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset   0.9   0.9          
Equipment | TNMP                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset   $ 1.4   $ 1.4