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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss)
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The sole component of accumulated other comprehensive income (loss) is pension and postretirement health and life benefit plans.

Changes in accumulated other comprehensive income (loss) for the sole component follow (in millions).
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2013
 
2012
 
2013
 
2012
Beginning balance
$
(196.5
)
 
$
(254.3
)
 
$
(291.9
)
 
$
(262.5
)
 
 
 
 
 
 
 
 
Gain arising during the period
—

 
—

 
138.3

 
—

Amortization of actuarial (gains) losses, net (a)
2.6

 
6.2

 
15.5

 
18.2

Amortization of prior service costs (a)
—

 
0.3

 
0.7

 
1.1

Total reclassifications for the period, before tax
2.6

 
6.5

 
154.5

 
19.3

Income tax (expense) benefit
(1.5
)
 
(2.4
)
 
(58.0
)
 
(7.0
)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax
1.1

 
4.1

 
96.5

 
12.3

 
 
 
 
 
 
 
 
Ending balance
$
(195.4
)
 
$
(250.2
)
 
$
(195.4
)
 
$
(250.2
)


(a)
These items reclassified from accumulated other comprehensive income (loss) are included in the computation of net benefit costs as detailed in Note 11.