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Defined Benefit Pension Plans
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Compensation and Employee Benefit Plans
DEFINED BENEFIT PENSION PLANS
The following table sets forth the net periodic pension cost for LP’s defined benefit pension plans during the quarter and nine months ended September 30, 2017 and 2016. The net periodic pension cost included the following components:
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
Dollar amounts in millions
2017
 
2016
 
2017
 
2016
Service cost
$
1.4

 
$
1.2

 
$
4.1

 
$
3.6

Interest cost
3.3

 
3.3

 
9.7

 
10.1

Expected return on plan assets
(3.3
)
 
(3.3
)
 
(9.8
)
 
(10.0
)
Amortization of prior service cost 1
0.2

 
0.1

 
0.6

 
0.3

Amortization of net loss 1
1.4

 
1.4

 
4.2

 
4.1

Net periodic pension cost
$
3.0

 
$
2.7

 
$
8.8

 
$
8.1


1The amortization of prior service costs and net loss are included in the amounts reclassified from accumulated other comprehensive income (loss); see Note 14 for additional details. The net periodic pension cost is included in Cost of sales and Selling and administrative expense in the Consolidated Statements of Income.
During the nine months ended September 30, 2017, LP made $12.8 million in pension contributions to its defined benefit pension plans. LP expects to contribute between $1.0 million and $2.0 million to its defined benefit pension plans in the remaining months of 2017.