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Benefit Plans
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Benefit Plans
Benefit Plans
Components of net periodic benefit cost for our pension plans for the three months ended March 31, 2019 and 2018 were as follows:
 
Three months ended
In millions
March 31,
2019
March 31,
2018
Service cost
$
0.7

$
1.0

Interest cost
2.7

3.0

Expected return on plan assets
(1.7
)
(2.2
)
Net periodic benefit cost
$
1.7

$
1.8

Components of net periodic benefit cost for our other post-retirement plans for the three months ended March 31, 2019 and 2018 were not material.