MARKETABLE SECURITIES (Tables)

3 Months Ended

Sep. 30, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of September 30, 2015								As of December 31, 2014
				Pre-Tax		Pre-Tax						Pre-Tax		Pre-Tax
		Amortized		Unrealized		Unrealized				Amortized		Unrealized		Unrealized
(Millions of Dollars)		Cost		Gains		Losses		Fair Value		Cost		Gains		Losses		Fair Value
Eversource
	Debt Securities (1) (2)	$	311.6	$	3.6	$	(0.8)	$	314.4	$	313.0	$	7.5	$	(0.3)	$	320.2
	Equity Securities (1)		220.0		53.9		(6.0)		267.9		160.6		73.3		-		233.9
WMECO
	Debt Securities (2)		58.3		-		-		58.3		58.2		-		(0.1)		58.1

Investments Classified by Contractual Maturity Date [Table Text Block]

	Eversource				WMECO
	Amortized				Amortized
(Millions of Dollars)	Cost		Fair Value		Cost		Fair Value
Less than one year (1)	$	68.1	$	68.1	$	40.5	$	40.5
One to five years		67.6		68.0		14.2		14.2
Six to ten years		56.9		56.9		0.5		0.5
Greater than ten years		119.0		121.4		3.1		3.1
Total Debt Securities	$	311.6	$	314.4	$	58.3	$	58.3

Fair Value Heirarchy [Table Text Block]

		Eversource				WMECO
(Millions of Dollars)		As of September 30, 2015		As of December 31, 2014		As of September 30, 2015		As of December 31, 2014
Level 1:
	Mutual Funds and Equities	$	282.1	$	319.0	$	-	$	-
	Money Market Funds		30.7		24.9		8.0		4.3
Total Level 1		$	312.8	$	343.9	$	8.0	$	4.3
Level 2:
	U.S. Government Issued Debt Securities (Agency and Treasury)	$	41.3	$	51.3	$	-	$	-
	Corporate Debt Securities		57.5		49.1		12.2		14.7
	Asset-Backed Debt Securities		27.9		54.1		7.6		14.5
	Municipal Bonds		123.9		116.3		10.3		13.0
	Other Fixed Income Securities		33.1		24.5		20.2		11.6
Total Level 2		$	283.7	$	295.3	$	50.3	$	53.8
Total Marketable Securities		$	596.5	$	639.2	$	58.3	$	58.1