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Defined Benefit Pension Plans | 6 Months Ended
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Jun. 30, 2013
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, 2013 and 2012. The net periodic pension cost included the following components:
| Quarter Ended June 30, |  | Six Months Ended June 30,
Dollar amounts in millions | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost | $ | 0.8 |  |  | $ | 0.9 |  |  | $ | 1.6 |  |  | $ | 1.8 |
Interest cost | 3.3 |  |  | 3.7 |  |  | 6.5 |  |  | 7.4 |
Expected return on plan assets | (4.1 | ) |  | (4.3 | ) |  | (8.2 | ) |  | (8.6 | )
Amortization of prior service cost | — |  |  | 0.1 |  |  | 0.1 |  |  | 0.2 |
Amortization of net loss | 1.9 |  |  | 1.7 |  |  | 3.7 |  |  | 3.4 |
Net periodic pension cost | $ | 1.9 |  |  | $ | 2.1 |  |  | $ | 3.7 |  |  | $ | 4.2 |
During the six months ended June 30, 2013 and 2012, LP recognized $3.7 million and $4.2 million of pension expense for all of LP’s defined benefit pension plans. During the six months ended June 30, 2013, LP made $1.1 million in pension contributions for LP’s Canadian defined benefit plans. LP presently anticipates making approximately $4.0 million in additional pension contributions for the plans during the remainder of 2013.

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