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Defined Benefit Pension Plans | 9 Months Ended
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Sep. 30, 2016
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 nine months ended September 30, 2016 and 2015. The net periodic pension cost included the following components:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
Dollar amounts in millions | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 1.2 |  |  | $ | 1.0 |  |  | $ | 3.6 |  |  | $ | 3.1 |
Interest cost | 3.3 |  |  | 3.4 |  |  | 10.1 |  |  | 10.2 |
Expected return on plan assets | (3.3 | ) |  | (3.8 | ) |  | (10.0 | ) |  | (11.4 | )
Amortization of prior service cost 1 | 0.1 |  |  | 0.1 |  |  | 0.3 |  |  | 0.3 |
Amortization of net loss 1 | 1.4 |  |  | 1.7 |  |  | 4.1 |  |  | 5.2 |
Net periodic pension cost | $ | 2.7 |  |  | $ | 2.4 |  |  | $ | 8.1 |  |  | $ | 7.4 |
Loss due to settlement | $ | — |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 0.4 |
1 The amortization of prior service costs and net loss are included in the amounts reclassified from accumulated other comprehensive income (loss); see Note 16 for additional details. The net periodic pension cost is included in Cost of sales and Selling and administrative expense in the Consolidated Statements of Income. During the nine months ended September 30, 2016 and 2015, LP recognized $8.1 million and $7.8 million (inclusive of a $0.4 million settlement loss associated with the retirement of one of LP's executives) of pension expense for all of LP's defined benefit pension plans. During the nine months ended September 30, 2016, LP made $6.7 million in pension contributions to its defined benefit pension plans. LP expects to contribute between $1.0 million and $3.0 million to its defined benefit pension plans in the remaining months of 2016.

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