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v3.20.2

Postretirement and Other Benefits (Tables) | 9 Months Ended
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Sep. 30, 2020
Retirement Benefits [Abstract] |
Net Pension Benefit Costs | The components of net pension and OPEB benefit costs for U.S. employees and net pension benefit costs for French employees during the three or nine months ended September 30, 2020 and 2019 were as follows ($ in millions):
| Three Months Ended September 30,
| U.S. Pension Benefits |  | French Pension Benefits |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 0.3 |  |  | $ | 0.3 |  |  |  |  |
Interest cost | 0.9 |  |  | 1.2 |  |  | — |  |  | 0.1 |  |  |  |  |
Expected return on plan assets | (1.2) |  |  | (1.5) |  |  | — |  |  | (0.1) |  |  |  |  |
Amortizations and other | 0.9 |  |  | 0.5 |  |  | 0.3 |  |  | 0.2 |  |  |  |  |
Net periodic benefit cost | $ | 0.6 |  |  | $ | 0.2 |  |  | $ | 0.6 |  |  | $ | 0.5 |  |  |  |  |
| Nine Months Ended September 30,
| U.S. Pension Benefits |  | French Pension Benefits |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 0.9 |  |  | $ | 0.8 |  |  |  |  |
Interest cost | 2.8 |  |  | 3.5 |  |  | 0.1 |  |  | 0.3 |  |  |  |  |
Expected return on plan assets | (3.7) |  |  | (4.4) |  |  | — |  |  | (0.1) |  |  |  |  |
Amortizations and other | 2.5 |  |  | 1.5 |  |  | 0.7 |  |  | 0.6 |  |  |  |  |
Net periodic benefit cost | $ | 1.6 |  |  | $ | 0.6 |  |  | $ | 1.7 |  |  | $ | 1.6 |  |  |  |  |

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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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