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Pensions | 3 Months Ended
--- | ---
Mar. 31, 2018
Retirement Benefits [Abstract] |
Pensions | PENSIONS 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 The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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