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Electric Operating Revenues - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) utility | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items] |  |  |
Number of regulated utilities | utility | 2 |  |
Accounts receivable, allowance for credit loss, period increase | $ (0.9) | $ 1.6 |
Other receivables, allowance for credit loss, period increase | 0.0 | $ 0.0 |
Contract assets | 3.4 |  | $ 0.6
Texas-New Mexico Power Company |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Regulatory assets | 0.8 |  | 0.8
PNM |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable | $ 77.7 |  | $ 86.8

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