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Pensions | 9 Months Ended
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Sep. 30, 2019
Retirement Benefits [Abstract] |
Pensions | PENSIONS The following table summarizes the components of net periodic pension expense (benefit):
| U.S. Benefit Plan |  | Non-U.S. Benefit Plan
| Three Months Ended September 30, |  | Nine Months Ended September 30, |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost | 1.7 |  |  | 1.6 |  |  | 5.1 |  |  | 4.8 |  |  | 0.3 |  |  | 0.3 |  |  | 1.0 |  |  | 1.0 |
Amortization of actuarial loss | 0.8 |  |  | 0.8 |  |  | 2.0 |  |  | 2.3 |  |  | 0.2 |  |  | 0.2 |  |  | 0.5 |  |  | 0.5 |
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |
Expected return on plan assets | (2.1 | ) |  | (2.2 | ) |  | (6.5 | ) |  | (6.6 | ) |  | (0.5 | ) |  | (0.5 | ) |  | (1.5 | ) |  | (1.7 | )
Net periodic pension expense (benefit) | $ | 0.4 |  |  | $ | 0.2 |  |  | $ | 0.6 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | (0.1 | )

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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