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Defined benefit plan (Tables) | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | The expense components of the Swiss Plan consisted of the following:
|  | Three Months Ended June 30, 2019 |  | Six months ended June 30, 2019
Net service cost |  | $ | 0.3 |  |  | $ | 0.6 |
Expected return on plan assets, net of expenses |  | (0.1 | ) |  | (0.1 | )
Total pension expense |  | $ | 0.2 |  |  | $ | 0.5 |

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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=108410482&loc=d3e1928-114920 + Details
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