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Defined benefit and 401(k) savings plan - Swiss Plan Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Retirement Benefits [Abstract] |  |  |
Pension expense | $ 0.8 | $ 2.0 | $ 2.4
Change in Plan Assets: |  |  |
Fair value of plan assets, beginning of period | 29.3 | 27.6 |
Employer contributions | 1.5 | 1.4 |
Employee contributions | 0.9 | 0.9 |
Net benefits received | 3.4 | 0.5 |
Actual return on plan assets | (0.4) | (0.1) |
Settlements | (5.0) | 0.0 |
Currency impact | (0.4) | (1.0) |
Fair value of plan assets, end of period | 29.3 | 29.3 | 27.6
Change in Benefit Obligation: |  |  |
Projected benefit obligation, beginning of period | 46.8 | 49.2 |
Service cost | 1.9 | 2.4 | 1.9
Interest Cost | 0.1 | 0.0 | 0.1
Employee contributions | 0.9 | 0.9 |
Actuarial gain | (10.0) | (4.6) |
Net benefits received | 3.4 | 0.5 |
Settlements | (5.0) | 0.0 |
Currency impact | (0.9) | (1.6) |
Projected benefit obligation, end of period | 37.2 | 46.8 | $ 49.2
Funded status, end of period | (7.9) | (17.5) |
Accumulated benefit obligation, end of period | $ 34.0 | $ 41.8 |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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