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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2013
Pension and Other Postretirement Benefit Expense [Abstract]  
Schedule of Net Benefit Costs
The pension and postretirement expenses related to the Company’s plans consisted of the following:

 
Pension Benefits
 
Postretirement Health Care Benefits
 
Three Months Ended
 
Three Months Ended
 
March 31,
 
March 31,
In millions
2013
 
2012
 
2013
2012
Components of Net Periodic Cost:
 
 
 
 
 
 
Service Cost
$
4.0

 
$
4.6

 
$
0.4

$
0.3

Interest Cost
13.1

 
12.7

 
0.5

0.6

Administrative Expenses
0.2

 
—

 
—

—

Expected Return on Plan Assets
(17.0
)
 
(14.5
)
 
—

—

Amortization:
 
 
 
 
 
 
 Prior Service Cost
0.2

 
0.1

 
—

—

Actuarial Loss (Gain)
9.4

 
7.5

 
(0.3
)
(0.3
)
Net Periodic Cost
$
9.9

 
$
10.4

 
$
0.6

$
0.6