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Pension and Other Retiree Benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost for Pension and Post-Retirement Plans | The components of net periodic benefit (income) cost for pension and post-retirement plans for the three and six months ended June 30, 2021 and 2020 were as follows:
| Three Months Ended June 30,
| Pension |  | Post-retirement
| U.S. |  | International |  |  |  |
(in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |
Interest cost | 1.2 |  |  | 1.4 |  |  | 1.6 |  |  | 2.4 |  |  | — |  |  | 0.1 |
Expected return on plan assets | (2.8) |  |  | (2.8) |  |  | (5.0) |  |  | (4.4) |  |  | — |  |  | — |
Amortization of net loss (gain) | 0.8 |  |  | 0.8 |  |  | 1.8 |  |  | 1.2 |  |  | (0.1) |  |  | (0.2) |
Amortization of prior service cost | — |  |  | 0.1 |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) (1) | $ | (0.7) |  |  | $ | (0.1) |  |  | $ | (1.2) |  |  | $ | (0.5) |  |  | $ | (0.1) |  |  | $ | (0.1) |
| Six Months Ended June 30,
| Pension |  | Post-retirement
| U.S. |  | International |  |  |  |
(in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.5 |  |  | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | 0.7 |  |  | $ | — |  |  | $ | — |
Interest cost | 2.2 |  |  | 2.9 |  |  | 3.2 |  |  | 4.8 |  |  | — |  |  | 0.1 |
Expected return on plan assets | (5.6) |  |  | (5.7) |  |  | (9.8) |  |  | (9.1) |  |  | — |  |  | — |
Amortization of net loss (gain) | 1.8 |  |  | 1.6 |  |  | 3.6 |  |  | 2.4 |  |  | (0.2) |  |  | (0.3) |
Amortization of prior service cost | 0.1 |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | — |
Curtailment loss(2) | 1.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (income) (1) | $ | 0.4 |  |  | $ | (0.2) |  |  | $ | (2.1) |  |  | $ | (1.1) |  |  | $ | (0.2) |  |  | $ | (0.2) |
(1)The components of net periodic benefit cost (income), other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income. (2)Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan.

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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=118255775&loc=d3e1928-114920 + Details
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