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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
Defined Benefit Plan [Abstract] |
Schedule of Net Periodic Benefit Costs | The following table provides the components of the net periodic benefit cost (credit) for the defined benefit pension and OPEB plans.
| Three Months Ended March 31
| Pension Benefits |  |  |  |
| U.S. Plans |  | U.K. Plan |  | OPEB
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
| (in millions of dollars)
Service Cost | $ | 2.3 |  |  | $ | 2.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest Cost | 19.9 |  |  | 21.1 |  |  | 1.5 |  |  | 1.5 |  |  | 1.2 |  |  | 1.5 |
Expected Return on Plan Assets | (26.1 | ) |  | (25.8 | ) |  | (2.4 | ) |  | (2.0 | ) |  | (0.1 | ) |  | (0.2 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Net Actuarial Loss | 5.4 |  |  | 4.9 |  |  | 0.2 |  |  | 0.2 |  |  | — |  |  | — |
Prior Service Credit | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | (0.1 | ) |  | (0.1 | )
Total | $ | 1.5 |  |  | $ | 2.1 |  |  | $ | (0.7 | ) |  | $ | (0.3 | ) |  | $ | 1.0 |  |  | $ | 1.2 |
The service cost component of net periodic pension and postretirement benefit cost is included as a component of compensation expense in our consolidated statements of income. All other components of net periodic pension and postretirement benefit cost are included in other expenses.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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