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Lease Commitments - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 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   $ 148.4   $ 148.4          
Unamortized cost, right-of-way lease payments   54.0   54.0     $ 55.8    
Operating lease, right-of-use assets, amortization expense   0.9 $ 0.9 2.8 $ 2.8        
Operating leases, capitalized financing costs, investing activities       2.3 2.6        
Finance leases, capitalized financing costs, investing activities       3.2 1.8        
Lessee, operating lease, unguaranteed residual value   26.3   26.3          
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 0.8        
Finance leases, capitalized financing costs, investing activities       1.2 0.7        
Lessee, operating lease, unguaranteed residual value   11.3   11.3          
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       1.6 1.8        
Finance leases, capitalized financing costs, investing activities       2.0 $ 1.1        
Lessee, operating lease, unguaranteed residual value   15.0   15.0          
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   0.8   0.8          
Equipment | TNMP                  
Operating Leased Assets [Line Items]                  
Operating lease, residual value of leased asset   $ 1.5   $ 1.5