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Defined Benefit Pension Plans
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [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 three months ended March 31, 2015 and 2014. The net periodic pension cost included the following components:
 
 
Three Months Ended March 31,
Dollar amounts in millions
 
2015
 
2014
Service cost
 
$
1.0

 
$
0.9

Interest cost
 
3.4

 
3.7

Expected return on plan assets
 
(3.8
)
 
(4.2
)
Amortization of prior service cost
 
0.1

 
—

Amortization of net loss
 
1.8

 
1.4

Net periodic pension cost
 
$
2.5

 
$
1.8


During the three months ended March 31, 2015 and 2014, LP recognized $2.5 million and $1.8 million of pension expense for all of LP's defined benefit pension plans.
During the three months ended March 31, 2015, LP made $1.0 million in pension contributions to its defined benefit pension plans. LP expects to contribute between $2.0 million and $5.0 million to its defined benefit pension plans in 2015.