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Other, Net (Tables)
 6 Months Ended
Jun. 30, 2018
Other Net [Abstract]  
Other, Net
The components of Other income/(expense), net for the three and six months ended June 30 are as follows:
 
Three months ended
 
Six months ended
In millions
2018

2017
 
2018
 
2017
Interest income
$
2.6

 
$
1.3

 
$
6.2

 
$
4.4

Exchange gain (loss)
(1.8
)
 
(3.4
)
 
(9.1
)
 
(1.5
)
Other components of net periodic benefit cost
(5.8
)
 
(6.2
)
 
(9.7
)
 
(14.4
)
Other activity, net
1.5

 
(3.2
)
 
5.1

 
(4.7
)
Other income/(expense), net
$
(3.5
)
 
$
(11.5
)
 
$
(7.5
)
 
$
(16.2
)