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MARKETABLE SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2023
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:
As of September 30, 2023As of December 31, 2022
Eversource
(Millions of Dollars)
Amortized CostPre-Tax
Unrealized Gains		Pre-Tax
Unrealized
Losses		Fair ValueAmortized CostPre-Tax
Unrealized Gains		Pre-Tax
Unrealized
Losses		Fair Value
Debt Securities$173.0 $0.3 $(11.0)$162.3 $201.6 $0.1 $(16.2)$185.5 
Contractual Maturities of Available-for-Sale Debt Securities
As of September 30, 2023, the contractual maturities of available-for-sale debt securities were as follows:
 
Eversource
(Millions of Dollars)
Amortized CostFair Value
Less than one year (1)
$19.0 $19.4 
One to five years29.9 29.2 
Six to ten years41.7 39.9 
Greater than ten years82.4 73.8 
Total Debt Securities$173.0 $162.3 
(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, 2023As of December 31, 2022
Level 1:    
Mutual Funds and Equities$168.3 $190.1 
Money Market Funds16.2 25.4 
Total Level 1$184.5 $215.5 
Level 2:  
U.S. Government Issued Debt Securities (Agency and Treasury)$86.1 $82.3 
Corporate Debt Securities34.1 46.1 
Asset-Backed Debt Securities5.9 8.6 
Municipal Bonds9.3 12.7 
Other Fixed Income Securities10.7 10.4 
Total Level 2$146.1 $160.1 
Total Marketable Securities$330.6 $375.6