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Construction Program and Jointly-Owned Electric Generating Plants - Summary of Budgeted Construction Expenditures (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Summary of Budgeted Construction Expenditures [Line Items]  
2021 $ 1,016.5
2022 765.1
2023 761.2
2024 713.0
2025 705.4
Total 3,961.2
Public Service Company of New Mexico  
Summary of Budgeted Construction Expenditures [Line Items]  
2021 661.9
2022 396.6
2023 382.0
2024 388.5
2025 379.9
Total 2,208.9
Anticipated expansion of transmission system 277.0
Texas-New Mexico Power Company  
Summary of Budgeted Construction Expenditures [Line Items]  
2021 320.1
2022 342.0
2023 348.0
2024 298.0
2025 299.0
Total 1,607.1
Corporate and Other  
Summary of Budgeted Construction Expenditures [Line Items]  
2021 34.5
2022 26.5
2023 31.2
2024 26.5
2025 26.5
Total $ 145.2