MARKETABLE SECURITIES (Tables)

3 Months Ended

Mar. 31, 2015

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of March 31, 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
ES
	Debt Securities (1)	$	318.2	$	8.2	$	(0.1)	$	326.3	$	313.0	$	7.5	$	(0.3)	$	320.2
	Equity Securities (1)		159.5		77.0		-		236.5		160.6		73.3		-		233.9
WMECO
	Debt Securities (2)		58.2		-		-		58.2		58.2		-		(0.1)		58.1

Investments Classified by Contractual Maturity Date [Table Text Block]

	ES				WMECO
	Amortized				Amortized
(Millions of Dollars)	Cost		Fair Value		Cost		Fair Value
Less than one year (1)	$	59.9	$	59.9	$	33.2	$	33.2
One to five years		83.3		83.8		21.3		21.3
Six to ten years		61.6		63.5		0.6		0.6
Greater than ten years		113.4		119.1		3.1		3.1
Total Debt Securities	$	318.2	$	326.3	$	58.2	$	58.2

Fair Value Heirarchy [Table Text Block]

		ES				WMECO
(Millions of Dollars)		As of March 31, 2015		As of December 31, 2014		As of March 31, 2015		As of December 31, 2014
Level 1:
	Mutual Funds and Equities	$	323.2	$	319.0	$	-	$	-
	Money Market Funds		32.9		24.9		10.5		4.3
Total Level 1		$	356.1	$	343.9	$	10.5	$	4.3
Level 2:
	U.S. Government Issued Debt Securities (Agency and Treasury)	$	46.0	$	51.3	$	-	$	-
	Corporate Debt Securities		157.3		49.1		14.4		14.7
	Asset-Backed Debt Securities		36.5		54.1		12.1		14.5
	Municipal Bonds		31.9		116.3		12.9		13.0
	Other Fixed Income Securities		21.7		24.5		8.3		11.6
Total Level 2		$	293.4	$	295.3	$	47.7	$	53.8
Total Marketable Securities		$	649.5	$	639.2	$	58.2	$	58.1