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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 6 Months Ended
Jun. 30, 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:
 
 
Three Months Ended June 30, 2014
 
Six Months Ended June 30, 2014
(Millions)
 
Cash Flow Hedges
 
Defined Benefit Plans
 
Accumulated Other Comprehensive Loss
 
Cash Flow Hedges
 
Defined Benefit Plans
 
Accumulated Other Comprehensive Loss
Balance at the beginning of period
 
$
(3.7
)
 
$
(19.9
)
 
$
(23.6
)
 
$
(3.1
)
 
$
(20.1
)
 
$
(23.2
)
Other comprehensive loss before reclassifications
 
—

 
—

 
—

 
—

 
(0.1
)
 
(0.1
)
Amounts reclassified out of accumulated other comprehensive loss
 
0.2

 
0.5

 
0.7

 
(0.4
)
 
0.8

 
0.4

Net current period other comprehensive income (loss)
 
0.2

 
0.5

 
0.7

 
(0.4
)
 
0.7

 
0.3

Balance at the end of period
 
$
(3.5
)
 
$
(19.4
)
 
$
(22.9
)
 
$
(3.5
)
 
$
(19.4
)
 
$
(22.9
)
 
 
Three Months Ended June 30, 2013
 
Six Months Ended June 30, 2013
(Millions)
 
Cash Flow Hedges
 
Defined Benefit Plans
 
Accumulated Other Comprehensive Loss
 
Cash Flow Hedges
 
Defined Benefit Plans
 
Accumulated Other Comprehensive Loss
Balance at the beginning of period
 
$
(4.2
)
 
$
(35.1
)
 
$
(39.3
)
 
$
(5.2
)
 
$
(35.7
)
 
$
(40.9
)
Other comprehensive income before reclassifications
 
0.6

 
—

 
0.6

 
0.7

 
—

 
0.7

Amounts reclassified out of accumulated other comprehensive loss
 
1.5

 
0.6

 
2.1

 
2.4

 
1.2

 
3.6

Net current period other comprehensive income
 
2.1

 
0.6

 
2.7

 
3.1

 
1.2

 
4.3

Balance at the end of period
 
$
(2.1
)
 
$
(34.5
)
 
$
(36.6
)
 
$
(2.1
)
 
$
(34.5
)
 
$
(36.6
)
Schedule of reclassifications out of accumulated other comprehensive loss
The following table shows the reclassifications out of accumulated other comprehensive loss during the three and six months ended June 30:
 
 
Amount Reclassified
 
 
 
 
Three Months Ended June 30
 
Six Months Ended June 30
 
Affected Line Item in the Statements of Income
 (Millions)
 
2014
 
2013
 
2014
 
2013
 
Losses on cash flow hedges
 
 
 
 
 
 
 
 
 
 
    Utility commodity derivative contracts
 
$
—

 
$
—

 
$
—

 
$
0.2

 
Operating and maintenance expense (1) (2)
    Nonregulated commodity derivative contracts
 
—

 
2.1

 
—

 
3.2

 
Nonregulated revenues (2)
    Interest rate hedges
 
0.2

 
0.3

 
0.5

 
0.5

 
Interest expense
 
 
0.2

 
2.4

 
0.5

 
3.9

 
Total before tax
 
 
—

 
0.9

 
0.9

 
1.5

 
Tax expense
 
 
0.2

 
1.5

 
(0.4
)
 
2.4

 
Net of tax
 
 
 
 
 
 
 
 
 
 
 
Defined benefit plans
 
 
 
 
 
 
 
 
 
 
    Amortization of prior service credits
 
—

 
—

 
(0.1
)
 
(0.1
)
 
(3) 
    Amortization of net actuarial losses
 
0.7

 
1.0

 
1.4

 
2.1

 
(3) 
 
 
0.7

 
1.0

 
1.3

 
2.0

 
Total before tax
 
 
0.2

 
0.4

 
0.5

 
0.8

 
Tax expense
 
 
0.5

 
0.6

 
0.8

 
1.2

 
Net of tax
Total reclassifications
 
$
0.7

 
$
2.1

 
$
0.4

 
$
3.6

 
 


(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 15, Employee Benefit Plans, for more information.