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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of pension and postretirement expenses
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
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Components of Net Periodic Cost:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service Cost
$
2.5

 
$
3.7

 
$
7.4

 
$
11.4

 
$
0.2

 
$
0.2

 
$
0.6

 
$
0.7

Interest Cost
10.7

 
13.3

 
33.1

 
40.3

 
0.3

 
0.4

 
1.0

 
1.3

Administrative Expenses
0.2

 
0.3

 
0.7

 
0.7

 
—

 
—

 
—

 
—

Expected Return on Plan Assets
(15.5
)
 
(18.4
)
 
(45.7
)
 
(55.6
)
 
—

 
—

 
—

 
—

Net Curtailment/Settlement Loss
0.5

 
—

 
0.5

 
—

 
—

 
—

 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 Prior Service Cost (Credit)
0.2

 
0.2

 
0.6

 
0.5

 
(0.1
)
 
(0.1
)
 
(0.2
)
 
(0.2
)
Actuarial Loss (Gain)
7.7

 
5.4

 
19.6

 
16.5

 
(0.4
)
 
(0.4
)
 
(1.6
)
 
(1.1
)
Net Periodic Cost
$
6.3

 
$
4.5

 
$
16.2

 
$
13.8

 
$
—

 
$
0.1

 
$
(0.2
)
 
$
0.7