XML 83 R66.htm IDEA: XBRL DOCUMENT v3.20.2
Lease Commitments - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jan. 16, 2016
lease
Jan. 15, 2015
lease
Operating Leased Assets [Line Items]                
Operating lease, payments to lessor upon occurrence of certain events   $ 154.5   $ 154.5        
Unamortized cost, right-of-way lease payments   58.8   58.8   $ 60.2    
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 2.0      
Finance leases, capitalized financing costs, investing activities       1.1 0.2      
Lessee, operating lease, unguaranteed residual value   24.8   24.8        
PNM                
Operating Leased Assets [Line Items]                
Operating leases, capitalized financing costs, investing activities       0.5 0.7      
Finance leases, capitalized financing costs, investing activities       0.4 0.1      
Lessee, operating lease, unguaranteed residual value   10.1   10.1        
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 $ 7.1              
TNMP                
Operating Leased Assets [Line Items]                
Operating leases, capitalized financing costs, investing activities       1.2 1.3      
Finance leases, capitalized financing costs, investing activities       0.7 $ 0.1      
Lessee, operating lease, unguaranteed residual value   14.7   14.7        
Equipment                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset   2.0   2.0        
Equipment | PNM                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset   0.7   0.7        
Equipment | TNMP                
Operating Leased Assets [Line Items]                
Operating lease, residual value of leased asset   $ 1.3   $ 1.3