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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 |  |  |  |

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