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Postretirement and Other Benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The components of net pension benefit costs for U.S., French and UK employees during the three or six months ended June 30, 2021 and 2020 were as follows ($ in millions):
| Three Months Ended June 30,
| U.S. Pension Benefits |  | French Pension Benefits |  | UK Pension Benefits |  |
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Interest cost | 0.7 |  |  | 1.0 |  |  | 0.1 |  |  | 0.1 |  |  | 0.8 |  |  | — |  |  |  |  |
Expected return on plan assets | (1.0) |  |  | (1.3) |  |  | — |  |  | — |  |  | (0.9) |  |  | — |  |  |  |  |
Amortizations and other | 0.9 |  |  | 0.8 |  |  | 0.2 |  |  | 0.1 |  |  | — |  |  | — |  |  |  |  |
Net periodic benefit cost | $ | 0.6 |  |  | $ | 0.5 |  |  | $ | 0.7 |  |  | $ | 0.5 |  |  | $ | (0.1) |  |  | $ | — |  |  |  |  |
| Six Months Ended June 30,
| U.S. Pension Benefits |  | French Pension Benefits |  | UK Pension Benefits |  |
| 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 0.7 |  |  | $ | 0.6 |  |  | $ | — |  |  | $ | — |  |  |  |  |
Interest cost | 1.4 |  |  | 1.9 |  |  | 0.1 |  |  | 0.1 |  |  | 0.8 |  |  | — |  |  |  |  |
Expected return on plan assets | (2.0) |  |  | (2.5) |  |  | — |  |  | — |  |  | (0.9) |  |  | — |  |  |  |  |
Amortizations and other | 1.8 |  |  | 1.6 |  |  | 0.5 |  |  | 0.4 |  |  | — |  |  | — |  |  |  |  |
Net periodic benefit cost | $ | 1.2 |  |  | $ | 1.0 |  |  | $ | 1.3 |  |  | $ | 1.1 |  |  | $ | (0.1) |  |  | $ | — |  |  |  |  |

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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=123447040&loc=d3e1928-114920 + Details
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