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MARKETABLE SECURITIES (Tables)

12 Months Ended

Dec. 31, 2013

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of December 31, 2013
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains⁽¹⁾			Losses⁽¹⁾			Fair Value
NU
	Debt Securities⁽²⁾	$	299.2		$	2.5		$	(2.1)		$	299.6
	Equity Securities⁽²⁾		163.6			60.5			-			224.1

WMECO
	Debt Securities		57.9			-			-			57.9

		As of December 31, 2012
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains⁽¹⁾			Losses⁽¹⁾			Fair Value
NU
	Debt Securities⁽²⁾	$	266.6		$	13.3		$	(0.1)		$	279.8
	Equity Securities⁽²⁾		145.5			20.0			-			165.5

WMECO
	Debt Securities		57.7			0.1			(0.1)			57.7

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⁾		$	72.4		$	72.3		$	26.5		$	26.6
One to five years			62.1			62.7			25.6			25.5
Six to ten years			59.4			59.3			1.7			1.7
Greater than ten years			105.3			105.3			4.1			4.1
Total Debt Securities		$	299.2		$	299.6		$	57.9		$	57.9

Fair Value Heirarchy [Table Text Block]

				NU						WMECO
				As of December 31,						As of December 31,
(Millions of Dollars)				2013			2012			2013			2012
Level 1:
	Mutual Funds and Equities			$	281.3		$	212.5		$	-		$	-
	Money Market Funds				32.9			40.2			10.9			5.2
Total Level 1				$	314.2		$	252.7		$	10.9		$	5.2
Level 2:
	U.S. Government Issued Debt Securities
		(Agency and Treasury)		$	61.4		$	69.9		$	6.8		$	18.7
	Corporate Debt Securities				53.6			33.0			15.1			7.0
	Asset-Backed Debt Securities				30.4			28.5			9.0			10.9
	Municipal Bonds				105.5			93.8			11.2			11.6
	Other Fixed Income Securities				15.8			14.4			4.9			4.3
Total Level 2				$	266.7		$	239.6		$	47.0		$	52.5
Total Marketable Securities				$	580.9		$	492.3		$	57.9		$	57.7