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Benefit Plans
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Benefit Plans
Benefit Plans
Components of net periodic benefit cost for our pension plans for the three and six months ended June 30, 2019 and 2018 were as follows:
 
Three months ended
 
Six months ended
In millions
June 30,
2019
June 30,
2018
 
June 30,
2019
June 30,
2018
Service cost
$
0.7

$
1.0

 
$
1.4

$
2.1

Interest cost
2.7

3.0

 
5.4

6.0

Expected return on plan assets
(1.7
)
(2.2
)
 
(3.4
)
(4.5
)
Plan settlement gain
(12.2
)
—

 
(12.2
)
—

Net periodic benefit (income) expense
$
(10.5
)
$
1.8

 
$
(8.8
)
$
3.6

Components of net periodic benefit (income) expense for our other post-retirement plans for the three and six months ended June 30, 2019 and 2018 were not material.
During the three months ended June 30, 2019, we received all required government approvals to terminate the Pentair Salaried Plan (the “Salaried Plan”). In June 2019, we entered into an agreement with an insurance company to purchase from us, through an annuity contract, our remaining obligations under the Salaried Plan. We contributed $10.7 million to the Salaried Plan as part of the process to settle our obligations. As a result of these actions, a non-cash pre-tax settlement gain of $12.2 million was recorded for the three and six months ended June 30, 2019 and is reflected within Plan settlement gain in the table above.