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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2018
Defined Benefit Plan [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Defined Benefit Pension and Other Postretirement Benefit (OPEB) Plans We sponsor several defined benefit pension and OPEB plans for our employees, including non-qualified pension plans. The U.S. qualified and non-qualified defined benefit pension plans comprise the majority of our total benefit obligation and benefit cost. We maintain a separate defined benefit plan for eligible employees in our U.K. operation. The U.S. defined benefit pension plans were closed to new entrants on December 31, 2013, the OPEB plan was closed to new entrants on December 31, 2012, and the U.K. plan was closed to new entrants on December 31, 2002. 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 The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 + Details
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