MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-sale Securities Reconciliation

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 December 31,
	2019									2018
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	$	228.4	$	5.8	$	(0.1	)	$	234.1	$	190.0	$	0.4	$	(4.0	)	$	186.4

Investments Classified by Contractual Maturity Date

As of December 31, 2019, 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)	$	59.2	$	59.3
One to five years	40.5		41.4
Six to ten years	33.6		34.8
Greater than ten years	95.1		98.6
Total Debt Securities	$	228.4	$	234.1

⁽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

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 December 31,
	2019		2018
Level 1:
Mutual Funds and Equities	$	228.5	$	244.0
Money Market Funds	46.0		25.9
Total Level 1	$	274.5	$	269.9
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	96.8	$	79.6
Corporate Debt Securities	44.0		39.5
Asset-Backed Debt Securities	12.9		14.0
Municipal Bonds	26.7		19.2
Other Fixed Income Securities	7.7		8.2
Total Level 2	$	188.1	$	160.5
Total Marketable Securities	$	462.6	$	430.4