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Pension And Other Retiree Benefits | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
Pension And Other Retiree Benefits | 6. Pension and Other Retiree Benefits The components of net periodic benefit (income) cost for pension and post-retirement plans for the three months ended March 31, 2019 and 2018 were as follows:
| Three Months Ended March 31,
| Pension |  | Post-retirement
| U.S. |  | International |  |  |  |
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | — |
Interest cost | 1.8 |  |  | 1.7 |  |  | 3.4 |  |  | 3.4 |  |  | 0.1 |  |  | — |
Expected return on plan assets | (2.9 | ) |  | (2.9 | ) |  | (5.1 | ) |  | (5.9 | ) |  | — |  |  | — |
Amortization of net loss (gain) | 0.5 |  |  | 0.6 |  |  | 0.8 |  |  | 0.9 |  |  | (0.1 | ) |  | (0.1 | )
Amortization of prior service cost | 0.1 |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit income(1) | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.6 | ) |  | $ | (1.1 | ) |  | $ | — |  |  | $ | (0.1 | )
(1) | The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Operations.
We expect to contribute approximately $21.2 million to our defined benefit plans in 2019. For the three months ended March 31, 2019, we have contributed $7.5 million to these plans.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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