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MARKETABLE SECURITIES (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2021As of December 31, 2020
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$214.3 $5.4 $(0.4)$219.3 $213.1 $11.2 $(0.1)$224.2 
Contractual Maturities of Available-for-Sale Debt Securities
As of March 31, 2021, the contractual maturities of available-for-sale debt securities were as follows:  
Eversource
(Millions of Dollars)
Amortized CostFair Value
Less than one year (1)
$40.4 $40.4 
One to five years60.6 62.3 
Six to ten years52.4 53.3 
Greater than ten years60.9 63.3 
Total Debt Securities$214.3 $219.3 

(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 March 31, 2021As of December 31, 2020
Level 1:    
Mutual Funds and Equities$242.5 $246.0 
Money Market Funds38.4 41.2 
Total Level 1$280.9 $287.2 
Level 2:  
U.S. Government Issued Debt Securities (Agency and Treasury)$93.9 $72.9 
Corporate Debt Securities58.5 63.8 
Asset-Backed Debt Securities10.9 11.9 
Municipal Bonds6.8 24.0 
Other Fixed Income Securities10.8 10.4 
Total Level 2$180.9 $183.0 
Total Marketable Securities$461.8 $470.2