ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

3 Months Ended

Mar. 31, 2014

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of changes, net of tax, in accumulated other comprehensive loss

The following tables show the changes, net of tax, to our accumulated other comprehensive loss during the three months endedMarch 31:

Three Months Ended March 31, 2014							Accumulated Other
(Millions)	Cash Flow Hedges			Defined Benefit Plans			Comprehensive Loss
Beginning balance at December 31, 2013	$	(3.1	)	$	(20.1	)	$	(23.2	)
Other comprehensive loss before reclassifications	—			(0.1		)	(0.1		)
Amounts reclassified out of accumulated other comprehensive loss	(0.6		)	0.3			(0.3		)
Net current period other comprehensive income (loss)	(0.6		)	0.2			(0.4		)
Ending balance at March 31, 2014	$	(3.7	)	$	(19.9	)	$	(23.6	)

Three Months Ended March 31, 2013							Accumulated Other
(Millions)	Cash Flow Hedges			Defined Benefit Plans			Comprehensive Loss
Beginning balance at December 31, 2012	$	(5.2	)	$	(35.7	)	$	(40.9	)
Other comprehensive income before reclassifications	0.1			—			0.1
Amounts reclassified out of accumulated other comprehensive loss	0.9			0.6			1.5
Net current period other comprehensive income	1.0			0.6			1.6
Ending balance at March 31, 2013	$	(4.2	)	$	(35.1	)	$	(39.3	)

Schedule of reclassifications out of accumulated other comprehensive loss

The following table shows the reclassifications out of accumulated other comprehensive loss during the three months endedMarch 31:

	Amount Reclassified
	Three Months Ended March 31
(Millions)	2014			2013			Affected Line Item in the Statements of Income
Losses on cash flow hedges
Utility commodity derivative contracts	$	—		$	0.2		Operating and maintenance expense (1) (2)
Nonregulated commodity derivative contracts	—			1.1			Nonregulated revenues (2)
Interest rate hedges	0.3			0.2			Interest expense
	0.3			1.5			Total before tax
	0.9			0.6			Tax expense
	(0.6		)	0.9			Net of tax
Defined benefit plans
Amortization of prior service credits	(0.1		)	(0.1		)	(3)
Amortization of net actuarial losses	0.7			1.1			(3)
	0.6			1.0			Total before tax
	0.3			0.4			Tax expense
	0.3			0.6			Net of tax
Total reclassifications	$	(0.3	)	$	1.5

⁽¹⁾  This item relates to changes in the price of natural gas used to support utility operations.

⁽²⁾  We no longer designate commodity contracts as cash flow hedges.

⁽³⁾  These items are included in the computation of net periodic benefit cost. See Note 13, Employee Benefit Plans, for more information.