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Pensions (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Summary of Components of Net Postretirement Pensions Expense | The following table summarizes the components of net postretirement pension expense:
| U.S. Benefit Plan |  | Non-U.S. Benefit Plan
| Three Months Ended March 31, |  | Three Months Ended March 31,
(in millions) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
Interest cost | 1.6 |  |  | 1.9 |  |  | 0.3 |  |  | 0.3 |
Amortization of actuarial loss | 0.8 |  |  | 0.6 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (2.2 | ) |  | (2.4 | ) |  | (0.6 | ) |  | (0.5 | )
Net postretirement pension expense | $ | 0.2 |  |  | $ | 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=82843861&loc=d3e1928-114920 + Details
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