MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018									2017
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	$	190.0	$	0.4	$	(4.0	)	$	186.4	$	284.9	$	3.2	$	(1.1	)	$	287.0

Investments Classified by Contractual Maturity Date

As of December 31, 2018, 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)	$	30.5	$	30.3
One to five years	29.2		28.9
Six to ten years	43.6		42.9
Greater than ten years	86.7		84.3
Total Debt Securities	$	190.0	$	186.4

⁽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,
	2018		2017
Level 1:
Mutual Funds and Equities	$	244.0	$	313.8
Money Market Funds	25.9		23.3
Total Level 1	$	269.9	$	337.1
Level 2:
U.S. Government Issued Debt Securities (Agency and Treasury)	$	79.6	$	70.2
Corporate Debt Securities	39.5		50.9
Asset-Backed Debt Securities	14.0		21.2
Municipal Bonds	19.2		110.7
Other Fixed Income Securities	8.2		10.7
Total Level 2	$	160.5	$	263.7
Total Marketable Securities	$	430.4	$	600.8