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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Schedule of Total Expense (Income) Related to Benefit Plans | The following tables present the total expense related to all benefit plans for the periods presented (in millions of dollars):
| Quarter Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Defined contribution plans 1 | $ | 1.7 |  |  | $ | 1.3 |  |  | $ | 5.6 |  |  | $ | 5.6 |
Deferred compensation plan 1 | 0.3 |  |  | 0.9 |  |  | 1.0 |  |  | 1.0 |
Multiemployer pension plans 1 | 1.2 |  |  | 1.1 |  |  | 2.4 |  |  | 2.3 |
Net periodic postretirement benefit cost relating to Salaried VEBA 2 | 1.6 |  |  | 1.6 |  |  | 3.3 |  |  | 3.1 |
Total | $ | 4.8 |  |  | $ | 4.9 |  |  | $ | 12.3 |  |  | $ | 12.0 |
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1 | Substantially all of the expense related to employee benefits are in COGS with the remaining balance in Selling, general, administrative, research and development ("SG&A and R&D").
2 The current service cost component of Net periodic postretirement benefit cost relating to Salaried VEBA is included within our Statements of Consolidated Income in SG&A and R&D for all periods presented. All other components of Net periodic postretirement benefit cost relating to Salaried VEBA are included within Other income, net in our Statements of Consolidated Income.
Schedule of Net Benefit Costs | The following table presents the components of Net periodic postretirement benefit cost relating to Salaried VEBA for the periods presented (in millions of dollars):
| Quarter Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Salaried VEBA 1: |  |  |  |  |  |  |
Interest cost | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | 1.6 |  |  | $ | 1.4 |
Expected return on plan assets | (0.7 | ) |  | (0.7 | ) |  | (1.3 | ) |  | (1.4 | )
Amortization of prior service cost 2 | 1.4 |  |  | 1.4 |  |  | 2.8 |  |  | 2.7 |
Amortization of net actuarial loss | 0.1 |  |  | 0.2 |  |  | 0.2 |  |  | 0.4 |
Total net periodic postretirement benefit cost relating to Salaried VEBA | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 3.3 |  |  | $ | 3.1 |
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1 | The service cost was insignificant for all periods presented.
2 We amortize prior service cost on a straight-line basis over the average remaining years of service to full eligibility for benefits of the active plan participants.

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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