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Defined Benefit Pension Plans
 3 Months Ended
Mar. 31, 2012
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 quarter ended March 31, 2012 and 2011. The net periodic pension cost included the following components:  
 
Quarter Ended March 31,
Dollar amounts in millions
2012
 
2011
Service cost
$
0.9

 
$
0.8

Interest cost
3.7

 
4.0

Expected return on plan assets
(4.3
)
 
(4.5
)
Amortization of prior service cost
0.1

 
0.1

Amortization of net loss
1.7

 
1.1

Net periodic pension cost
$
2.1

 
$
1.5


During the three months ended March 31, 2012 and 2011, LP recognized $2.1 million and $1.5 million of pension expense for all of LP’s defined benefit pension plans.
During the three months ended March 31, 2012, LP made $0.5 million in pension contributions for LP’s defined benefit plans. LP presently anticipates making approximately $0.5 million in additional pension contributions for the plans during the remainder of 2012.