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Benefit Plans
 9 Months Ended
Sep. 30, 2017
Benefit Plans
Benefit Plans
Components of net periodic benefit cost for our pension plans for the three and nine months ended September 30, 2017 and 2016 were as follows:
 
U.S. pension plans
 
Three months ended
 
Nine months ended
In millions
September 30,
2017
September 30,
2016
 
September 30,
2017
September 30,
2016
Service cost
$
2.6

$
2.8

 
$
7.8

$
8.4

Interest cost
4.1

4.1

 
12.3

12.3

Expected return on plan assets
(2.9
)
(2.9
)
 
(8.7
)
(8.6
)
Net periodic benefit cost
$
3.8

$
4.0

 
$
11.4

$
12.1

 
Non-U.S. pension plans
 
Three months ended
 
Nine months ended
In millions
September 30,
2017
September 30,
2016
 
September 30,
2017
September 30,
2016
Service cost
$
1.8

$
2.1

 
$
5.4

$
6.2

Interest cost
0.9

1.1

 
2.7

3.3

Expected return on plan assets
(0.3
)
(0.4
)
 
(0.9
)
(1.2
)
Net periodic benefit cost
$
2.4

$
2.8

 
$
7.2

$
8.3


Components of net periodic benefit cost for our other post-retirement plans for the three and nine months ended September 30, 2017 and 2016 were not material.