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MARKETABLE SECURITIES (Tables)

6 Months Ended

Jun. 30, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of June 30, 2014
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains			Losses			Fair Value
NU
	Debt Securities⁽¹⁾	$	308.3		$	7.3		$	(0.3)		$	315.3
	Equity Securities⁽¹⁾		163.5			66.7			-			230.2

WMECO
	Debt Securities⁽²⁾		58.0			-			-			58.0

		As of December 31, 2013
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains			Losses			Fair Value
NU
	Debt Securities⁽¹⁾	$	299.2		$	2.5		$	(2.1)		$	299.6
	Equity Securities⁽¹⁾		163.6			60.5			-			224.1

WMECO
	Debt Securities⁽²⁾		57.9			-			-			57.9

Investments Classified by Contractual Maturity Date [Table Text Block]

		NU						WMECO
		Amortized						Amortized
(Millions of Dollars)		Cost			Fair Value			Cost			Fair Value
Less than one year⁽¹⁾		$	75.9		$	75.8		$	19.2		$	19.2
One to five years			73.9			74.6			31.9			32.0
Six to ten years			56.1			57.7			2.7			2.7
Greater than ten years			102.4			107.2			4.2			4.1
Total Debt Securities		$	308.3		$	315.3		$	58.0		$	58.0

Fair Value Heirarchy [Table Text Block]

				NU						WMECO
				As of						As of
(Millions of Dollars)				June 30, 2014			December 31, 2013			June 30, 2014			December 31, 2013
Level 1:
	Mutual Funds and Equities			$	314.7		$	281.3		$	-		$	-
	Money Market Funds				42.3			32.9			2.0			10.9
Total Level 1				$	357.0		$	314.2		$	2.0		$	10.9
Level 2:
	U.S. Government Issued Debt Securities (Agency and Treasury)			$	40.6		$	61.4		$	-		$	6.8
	Corporate Debt Securities				61.8			53.6			15.8			15.1
	Asset-Backed Debt Securities				36.5			30.4			15.2			9.0
	Municipal Bonds				109.5			105.5			11.7			11.2
	Other Fixed Income Securities				24.6			15.8			13.3			4.9
Total Level 2				$	273.0		$	266.7		$	56.0		$	47.0
Total Marketable Securities				$	630.0		$	580.9		$	58.0		$	57.9