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Defined Benefit Pension Plans | 6 Months Ended
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Jun. 30, 2011
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 June 30, 2011 and 2010. The net periodic pension cost included the following components:
| Quarter Ended June 30, |  | Six Months Ended June 30,
Dollar amounts in millions | 2011 |  | 2010 |  | 2011 |  | 2010
Service cost | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | 1.6 |  |  | $ | 1.7 |
Interest cost | 4.0 |  |  | 4.4 |  |  | 8.0 |  |  | 9.8 |
Expected return on plan assets | (4.5 | ) |  | (4.7 | ) |  | (9.0 | ) |  | (10.7 | )
Amortization of prior service cost | 0.1 |  |  | 0.1 |  |  | 0.2 |  |  | 0.2 |
Amortization of net loss | 1.1 |  |  | 1.2 |  |  | 2.2 |  |  | 2.8 |
Net periodic pension cost | $ | 1.5 |  |  | $ | 1.7 |  |  | $ | 3.0 |  |  | $ | 3.8 |
During the six months ended June 30, 2011 and 2010, LP recognized $3.0 million and $3.8 million of pension expense for all of LP’s defined benefit pension plans. During the six months ended June 30, 2011, LP made no significant pension contributions for LP’s defined benefit plans. LP presently anticipates making approximately $10 to $12 million of pension contributions for the plans during the remainder of 2011.

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