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Lease Commitments - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 15, 2016 USD ($) lease MW | Apr. 30, 2018 USD ($) | Mar. 31, 2019 USD ($) lease | Dec. 31, 2018 USD ($) | Jan. 31, 2016 lease | Jan. 16, 2016 lease | Jan. 15, 2015 lease
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Capitalized operating lease costs |  |  | $ 1.1 |  |  |  |
Capitalized financing lease costs (less than) |  |  | 0.1 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 22.1 |  |  |  |
Operating lease, unguaranteed residual value |  |  |  | $ 18.5 |  |  |
PNM |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Capitalized operating lease costs |  |  | 0.4 |  |  |  |
Capitalized financing lease costs (less than) |  |  | 0.1 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 9.9 |  |  |  |
Operating lease, unguaranteed residual value |  |  |  | $ 7.5 |  |  |
PNM | Navajo Nation |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Annual lease payments |  |  | 6.0 |  |  |  |
Right-of-way lease payments |  | $ 6.9 |  |  |  |  |
PNM | Palo Verde Nuclear Generating Station, Unit 1 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 |  |  |  |
Number of leases under which assets were purchased | lease | 3 |  | 3 |  | 3 | 3 |
Leased capacity to be purchased (in megawatts) | MW | 32.76 |  |  |  |  |  |
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases, 31.25 MW |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Number of leases under which assets were purchased | lease | 1 |  |  |  |  |  |
Payment to lessors | $ 78.1 |  |  |  |  |  |
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases, January 15, 2016 |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Leased capacity to be purchased (in megawatts) | MW | 31.25 |  |  |  |  |  |
PNM | Palo Verde Nuclear Generating Station, Unit 2 Leases, 32.76 MW |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Number of leases under which assets were purchased | lease | 2 |  |  |  |  |  |
Payment to lessors | $ 85.2 |  |  |  |  |  |
PNM | Palo Verde Nuclear Generating Station |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Restriction on conveying, transferring, leasing and dividends |  |  |  | 5.00% |  |  |
Loss contingency, lease arrangements (up to) |  |  | $ 161.2 |  |  |  |
TNMP |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Capitalized operating lease costs |  |  | 0.7 |  |  |  |
Capitalized financing lease costs (less than) |  |  | 0.1 |  |  |  |
Lessee, operating lease, unguaranteed residual value |  |  | 12.2 |  |  |  |
Operating lease, unguaranteed residual value |  |  |  | $ 11.0 |  |  |
Equipment |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 1.6 |  |  |  |
Equipment | PNM |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | 0.5 |  |  |  |
Equipment | TNMP |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Operating lease, residual value of leased asset |  |  | $ 1.1 |  |  |  |

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