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MARKETABLE SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Summary of Available-for-Sale Debt Securities | The following is a summary of the available-for-sale debt securities, which are recorded at fair value and are included in current and long-term Marketable Securities on the balance sheets.
| As of September 30, 2021 |  | As of December 31, 2020
Eversource (Millions of Dollars) | Amortized Cost |  | Pre-Tax Unrealized Gains |  | Pre-Tax Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Pre-Tax Unrealized Gains |  | Pre-Tax Unrealized Losses |  | Fair Value
Debt Securities | $ | 217.5 |  |  | $ | 8.0 |  |  | $ | (0.2) |  |  | $ | 225.3 |  |  | $ | 213.1 |  |  | $ | 11.2 |  |  | $ | (0.1) |  |  | $ | 224.2 |
Contractual Maturities of Available-for-Sale Debt Securities | As of September 30, 2021, the contractual maturities of available-for-sale debt securities were as follows:
Eversource (Millions of Dollars) | Amortized Cost |  | Fair Value
Less than one year (1) | $ | 30.9 |  |  | $ | 30.9 |
One to five years | 65.5 |  |  | 67.1 |
Six to ten years | 41.8 |  |  | 43.9 |
Greater than ten years | 79.3 |  |  | 83.4 |
Total Debt Securities | $ | 217.5 |  |  | $ | 225.3 |
(1) Amounts in the Less than one year category include securities in the CYAPC and YAEC spent nuclear fuel trusts, which are restricted and are classified in long-term Marketable Securities on the balance sheets.
Marketable Securities Recorded at Fair Value on a Recurring Basis by Level | The following table presents the marketable securities recorded at fair value on a recurring basis by the level in which they are classified within the fair value hierarchy:
Eversource (Millions of Dollars) | As of September 30, 2021 |  | As of December 31, 2020
Level 1: |  |  |
Mutual Funds and Equities | $ | 254.1 |  |  | $ | 246.0 |
Money Market Funds | 29.7 |  |  | 41.2 |
Total Level 1 | $ | 283.8 |  |  | $ | 287.2 |
Level 2: |  |  |
U.S. Government Issued Debt Securities (Agency and Treasury) | $ | 98.9 |  |  | $ | 72.9 |
Corporate Debt Securities | 63.4 |  |  | 63.8 |
Asset-Backed Debt Securities | 13.4 |  |  | 11.9 |
Municipal Bonds | 6.1 |  |  | 24.0 |
Other Fixed Income Securities | 13.8 |  |  | 10.4 |
Total Level 2 | $ | 195.6 |  |  | $ | 183.0 |
Total Marketable Securities | $ | 479.4 |  |  | $ | 470.2 |

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