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Defined benefit and 401(k) savings plan | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Defined benefit and 401(k) savings plan | Defined benefit and 401(k) savings plan The Company sponsors a defined benefit pension plan covering eligible employees in Switzerland (the "Swiss Plan"), which we have agreed to sell as part of our Travel Health business to Bavarian Nordic, described further in Note 18, "Subsequent events". Under the Swiss Plan, the Company and certain of its employees with annual earnings in excess of government determined amounts are required to make contributions into a fund managed by an independent investment fiduciary. Employer contributions must be in an amount at least equal to the employee’s contribution. The Swiss Plan's assets are comprised of an insurance contract that has a fair value consistent with its contract value based on the practicability exception using Level 3 inputs. The entire liability is listed as non-current because plan assets are greater than the expected benefit payments over the next year. The Company recognized pension expense related to the Swiss Plan of $0.8 million, $2.0 million and $2.4 million reflected as a component of selling, general and administrative expenses for the years ended December 31, 2022, 2021 and 2020, respectively. The funded status of the Swiss Plan is as follows:
| Year Ended December 31,
| 2022 |  | 2021
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) |  |  | — |
Currency impact | (0.4) |  |  | (1.0) |
Fair value of plan assets, end of period | $ | 29.3 |  |  | $ | 29.3 |
Change in Benefit Obligation: |  |  |
Projected benefit obligation, beginning of period | $ | 46.8 |  |  | $ | 49.2 |
Service cost | 1.9 |  |  | 2.4 |
Interest Cost | 0.1 |  |  | — |
Employee contributions | 0.9 |  |  | 0.9 |
Actuarial gain | (10.0) |  |  | (4.6) |
Net benefits received | 3.4 |  |  | 0.5 |
Settlements | (5.0) |  |  | — |
Currency impact | (0.9) |  |  | (1.6) |
Projected benefit obligation, end of period | $ | 37.2 |  |  | $ | 46.8 |
Funded status, end of period | $ | (7.9) |  |  | $ | (17.5) |
Accumulated benefit obligation, end of period | $ | 34.0 |  |  | $ | 41.8 |
Components of net periodic pension cost incurred during the years ended December 31, 2022, 2021 and 2020 are as follows:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Service cost | $ | 1.9 |  |  | $ | 2.4 |  |  | $ | 1.9 |
Interest cost | 0.1 |  |  | — |  |  | 0.1 |
Expected return on plan assets | (0.8) |  |  | (0.8) |  |  | (0.6) |
Amortization of loss | 0.1 |  |  | 0.6 |  |  | 0.2 |
Amortization of prior service credit | (0.1) |  |  | (0.2) |  |  | (0.2) |
Settlements | (0.4) |  |  | — |  |  | 1.0 |
Net periodic benefit cost | $ | 0.8 |  |  | $ | 2.0 |  |  | $ | 2.4 |
The weighted average assumptions used to calculate the projected benefit obligations are as follows:
| December 31, 2022 |  | December 31, 2021
Discount rate | 2.1 | % |  | 0.3 | %
Expected rate of return | 3.5 | % |  | 3.0 | %
Rate of future compensation increases | 1.8 | % |  | 1.4 | %
The overall expected long-term rate of return on assets assumption considers historical returns, as well as expected future returns based on the fact that investment returns are insured, and the legal minimum interest crediting rate as applicable. Total contributions expected to be made into the plan for the year-ended December 31, 2023 is $1.6 million. The following table presents gains (losses) recognized in accumulated other comprehensive income (loss) before income tax related to the Company’s defined benefit pension plans:
| Year Ended December 31,
| 2022 |  | 2021
Net actuarial gain | $ | 9.0 |  |  | $ | 5.9 |
Prior service cost | (0.3) |  |  | (1.3) |
Total recognized in other comprehensive income (loss) | $ | 8.7 |  |  | $ | 4.6 |
Future benefits expected to be paid as of December 31, 2022 are as follows:
Year | As of December 31, 2022
2023 | $ | 1.8 |
2024 | 1.8 |
2025 | 2.0 |
2026 | 1.9 |
2027 | 2.1 |
Thereafter | 27.6 |
Total | $ | 37.2 |
401(k) savings plan The Company has established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code (the "401(k) Plan"). The 401(k) Plan covers substantially all U.S. employees. Under the 401(k) Plan, employees may make elective salary deferrals. During the years ended December 31, 2022, 2021 and 2020, the Company made matching contributions of approximately $8.8 million, $8.9 million and $6.6 million, respectively.

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