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Benefit Plans
 6 Months Ended
Jun. 30, 2017
Benefit Plans
Benefit Plans
Components of net periodic benefit cost for our pension plans for the three and six months ended June 30, 2017 and 2016 were as follows:
 
U.S. pension plans
 
Three months ended
 
Six months ended
In millions
June 30,
2017
June 30,
2016
 
June 30,
2017
June 30,
2016
Service cost
$
2.6

$
2.8

 
$
5.2

$
5.6

Interest cost
4.1

4.1

 
8.2

8.2

Expected return on plan assets
(2.9
)
(2.9
)
 
(5.8
)
(5.8
)
Net periodic benefit cost
$
3.8

$
4.0

 
$
7.6

$
8.0

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

$
2.1

 
$
3.6

$
4.2

Interest cost
0.9

1.1

 
1.8

2.2

Expected return on plan assets
(0.3
)
(0.4
)
 
(0.6
)
(0.8
)
Net periodic benefit cost
$
2.4

$
2.8

 
$
4.8

$
5.6


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