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MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Available For Sale Securities Reconciliation [Table TextBlock]

		As of September 30, 2014
					Pre-Tax			Pre-Tax
		Amortized			Unrealized			Unrealized
(Millions of Dollars)		Cost			Gains			Losses			Fair Value
NU
	Debt Securities⁽¹⁾	$	310.6		$	7.8		$	(0.2)		$	318.2
	Equity Securities⁽¹⁾		160.9			71.1			-			232.0

WMECO
	Debt Securities⁽²⁾		58.1			0.1			(0.1)			58.1

		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⁾		$	47.6		$	47.6		$	21.9		$	22.1
One to five years			91.0			91.4			30.7			30.5
Six to ten years			65.6			67.5			1.4			1.4
Greater than ten years			106.4			111.7			4.1			4.1
Total Debt Securities		$	310.6		$	318.2		$	58.1		$	58.1

Fair Value Heirarchy [Table Text Block]

				NU						WMECO
				As of						As of
(Millions of Dollars)				September 30, 2014			December 31, 2013			September 30, 2014			December 31, 2013
Level 1:
	Mutual Funds and Equities			$	314.6		$	281.3		$	-		$	-
	Money Market Funds				27.1			32.9			4.4			10.9
Total Level 1				$	341.7		$	314.2		$	4.4		$	10.9
Level 2:
	U.S. Government Issued Debt Securities (Agency and Treasury)			$	56.5		$	61.4		$	-		$	6.8
	Corporate Debt Securities				61.2			53.6			14.1			15.1
	Asset-Backed Debt Securities				37.9			30.4			14.3			9.0
	Municipal Bonds				112.5			105.5			13.9			11.2
	Other Fixed Income Securities				23.0			15.8			11.4			4.9
Total Level 2				$	291.1		$	266.7		$	53.7		$	47.0
Total Marketable Securities				$	632.8		$	580.9		$	58.1		$	57.9