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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 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
 
Nine Months Ended
 
Three Months Ended
Nine Months Ended
 
September 30,
 
September 30,
 
September 30,
September 30,
In millions
2013
 
2012
 
2013
 
2012
 
2013
2012
 
2013
 
2012
Components of Net Periodic Cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service Cost
$
4.0

 
$
5.1

 
$
12.1

 
$
14.1

 
$
0.4

$
0.3

 
$
1.1

 
$
1.0

Interest Cost
13.1

 
13.2

 
39.4

 
38.3

 
0.6

0.6

 
1.7

 
1.8

Administrative Expenses
0.2

 
—

 
0.5

 
0.1

 
—

—

 
—

 
—

Expected Return on Plan Assets
(17.0
)
 
(14.9
)
 
(51.1
)
 
(43.5
)
 
—

—

 
—

 
—

Curtailment Gain
—

 
—

 
—

 
(0.2
)
 
—

—

 
—

 
—

Special Termination Benefit
1.2

 
—

 
1.2

 
—

 
—

—

—

—

—

—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Prior Service Cost (Credit)
0.1

 
0.3

 
0.5

 
0.5

 
—

—

 
(0.1
)
 
(0.1
)
Actuarial Loss (Gain)
9.4

 
7.5

 
28.2

 
22.5

 
(0.3
)
(0.3
)
 
(0.8
)
 
(0.9
)
Net Periodic Cost
$
11.0

 
$
11.2

 
$
30.8

 
$
31.8

 
$
0.7

$
0.6

 
$
1.9

 
$
1.8