ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)

12 Months Ended

Dec. 31, 2014

Notes To Consolidated Financial Statements [Abstract]

Schedule Of Accumulated Other Comprehensive Income Loss Table Text Block

	For the Year Ended December 31, 2014								For the Year Ended December 31, 2013
	Qualified		Unrealized						Qualified		Unrealized
	Cash Flow		Gains/(Losses)		Defined				Cash Flow		Gains/(Losses)		Defined
	Hedging		on Marketable		Benefit				Hedging		on Marketable		Benefit
(Millions of Dollars)	Instruments		Securities		Plans		Total		Instruments		Securities		Plans		Total
AOCI as of January 1st	$	(14.4)	$	0.4	$	(32.0)	$	(46.0)	$	(16.4)	$	1.3	$	(57.8)	$	(72.9)
OCI Before Reclassifications		-		0.3		(34.2)		(33.9)		-		(0.9)		19.4		18.5
Amounts Reclassified from AOCI		2.0		-		3.9		5.9		2.0		-		6.4		8.4
Net OCI		2.0		0.3		(30.3)		(28.0)		2.0		(0.9)		25.8		26.9
AOCI as of December 31st	$	(12.4)	$	0.7	$	(62.3)	$	(74.0)	$	(14.4)	$	0.4	$	(32.0)	$	(46.0)

Schedule Of Comprehensive Income Loss [Table Text Block]

	For the Years Ended December 31,
	2014		2013		2012
	Amounts Reclassified		Amounts Reclassified		Amounts Reclassified		Statements of Income
(Millions of Dollars)	from AOCI		from AOCI		from AOCI		Line Item Impacted
Qualified Cash Flow Hedging Instruments	$	(3.4)	$	(3.4)	$	(3.3)	Interest Expense
Tax Effect		1.4		1.4		1.3	Income Tax Expense
Qualified Cash Flow Hedging Instruments, Net of Tax	$	(2.0)	$	(2.0)	$	(2.0)
Defined Benefit Plan Costs:
Amortization of Actuarial Losses	$	(6.2)	$	(10.5)	$	(8.9)	Operations and Maintenance (1)
Amortization of Prior Service Cost		(0.2)		(0.2)		(0.2)	Operations and Maintenance (1)
Amortization of Transition Obligation		0.0		0.0		(0.2)	Operations and Maintenance (1)
Total Defined Benefit Plan Costs		(6.4)		(10.7)		(9.3)
Tax Effect		2.5		4.3		3.5	Income Tax Expense
Defined Benefit Plan Costs, Net of Tax	$	(3.9)	$	(6.4)	$	(5.8)
Total Amounts Reclassified from AOCI, Net of Tax	$	(5.9)	$	(8.4)	$	(7.8)