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Postretirement and Other Benefits (Tables) | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [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 months ended March 31, 2017 and 2016 were as follows ($ in millions):
| Three Months Ended March 31,
| U.S. Pension Benefits |  | French Pension Benefits |  | U.S. OPEB Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | — |  |  | $ | — |  |  | 0.2 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |
Interest cost | 1.2 |  |  | 1.3 |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | — |
Expected return on plan assets | (1.6 | ) |  | (1.7 | ) |  | — |  |  | (0.1 | ) |  | — |  |  | — |
Amortizations and other | 0.9 |  |  | 1.0 |  |  | 0.3 |  |  | 0.3 |  |  | 0.1 |  |  | 0.1 |
Net periodic benefit cost | $ | 0.5 |  |  | $ | 0.6 |  |  | $ | 0.6 |  |  | $ | 0.6 |  |  | $ | 0.1 |  |  | $ | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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