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Defined Benefit Pension Plans | 6 Months Ended
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Jun. 30, 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 quarter and six months ended June 30, 2015 and 2014. The net periodic pension cost included the following components:
| Quarter Ended June 30, |  | Six Months Ended June 30,
Dollar amounts in millions | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 1.0 |  |  | $ | 0.9 |  |  | $ | 2.0 |  |  | $ | 1.9 |
Interest cost | 3.4 |  |  | 3.6 |  |  | 6.8 |  |  | 7.3 |
Expected return on plan assets | (3.8 | ) |  | (4.2 | ) |  | (7.6 | ) |  | (8.5 | )
Amortization of prior service cost | 0.1 |  |  | — |  |  | 0.2 |  |  | — |
Amortization of net loss | 1.8 |  |  | 1.4 |  |  | 3.6 |  |  | 2.8 |
Net periodic pension cost | $ | 2.5 |  |  | $ | 1.7 |  |  | $ | 5.0 |  |  | $ | 3.5 |
During the six months ended June 30, 2015 and 2014, LP recognized $5.0 million and $3.5 million of pension expense for all of LP's defined benefit pension plans. During the six months ended June 30, 2015, LP made $1.4 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.

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