MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2016

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of March 31, 2016								As of December 31, 2015
				Pre-Tax		Pre-Tax						Pre-Tax		Pre-Tax
Eversource		Amortized		Unrealized		Unrealized				Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains		Losses		Fair Value		Cost		Gains		Losses		Fair Value
	Debt Securities	$	257.9	$	7.0	$	(0.1)	$	264.8	$	256.5	$	4.5	$	(0.6)	$	260.4
	Equity Securities		214.7		42.0		(3.5)		253.2		215.3		59.2		(3.4)		271.1

Investments Classified by Contractual Maturity Date [Table Text Block]

Eversource	Amortized
(Millions of Dollars)	Cost		Fair Value
Less than one year (1)	$	38.2	$	38.2
One to five years		51.5		52.1
Six to ten years		42.7		44.4
Greater than ten years		125.5		130.1
Total Debt Securities	$	257.9	$	264.8

Fair Value Heirarchy [Table Text Block]

Eversource
(Millions of Dollars)		As of March 31, 2016		As of December 31, 2015
Level 1:
	Mutual Funds and Equities	$	267.2	$	285.3
	Money Market Funds		32.1		26.9
Total Level 1		$	299.3	$	312.2
Level 2:
	U.S. Government Issued Debt Securities (Agency and Treasury)	$	59.4	$	46.6
	Corporate Debt Securities		37.0		43.9
	Asset-Backed Debt Securities		19.6		20.0
	Municipal Bonds		108.0		111.4
	Other Fixed Income Securities		8.7		11.6
Total Level 2		$	232.7	$	233.5
Total Marketable Securities		$	532.0	$	545.7