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MARKETABLE SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Summary of Available-for-Sale Debt Securities | The following is a summary of available-for-sale debt securities, which are held in CYAPC’s and YAEC’s spent nuclear fuel trusts:
| As of June 30, 2024 |  | As of December 31, 2023
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 | $ | 172.8 |  |  | $ | 0.2 |  |  | $ | (10.0) |  |  | $ | 163.0 |  |  | $ | 169.5 |  |  | $ | 1.4 |  |  | $ | (6.6) |  |  | $ | 164.3 |
Contractual Maturities of Available-for-Sale Debt Securities | As of June 30, 2024, the contractual maturities of available-for-sale debt securities were as follows:
Eversource (Millions of Dollars) | Amortized Cost |  | Fair Value
Less than one year | $ | 17.8 |  |  | $ | 17.7 |
One to five years | 30.9 |  |  | 30.3 |
Six to ten years | 43.9 |  |  | 42.5 |
Greater than ten years | 80.2 |  |  | 72.5 |
Total Debt Securities | $ | 172.8 |  |  | $ | 163.0 |
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 June 30, 2024 |  | As of December 31, 2023
Level 1: |  |  |
Mutual Funds and Equities | $ | 172.6 |  |  | $ | 176.9 |
Money Market Funds | 16.3 |  |  | 13.7 |
Total Level 1 | $ | 188.9 |  |  | $ | 190.6 |
Level 2: |  |  |
U.S. Government Issued Debt Securities (Agency and Treasury) | $ | 87.6 |  |  | $ | 90.1 |
Corporate Debt Securities | 33.5 |  |  | 34.0 |
Asset-Backed Debt Securities | 8.3 |  |  | 5.6 |
Municipal Bonds | 7.0 |  |  | 9.8 |
Other Fixed Income Securities | 10.3 |  |  | 11.1 |
Total Level 2 | $ | 146.7 |  |  | $ | 150.6 |
Total Marketable Securities | $ | 335.6 |  |  | $ | 341.2 |

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