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Defined benefit and 401(k) savings plan (Tables)

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Summary of Funded Status of the Swiss Plan

The funded status of the Swiss Plan for the years ended December 31, 2022 is as follows:

			Year Ended December 31,
			2022
Change in Plan Assets:
Fair value of plan assets, beginning of period			$	29.3
Employer contributions			1.5
Employee contributions			0.9
Net benefits received			3.4
Actual return on plan assets			(0.4)
Settlements			(5.0)
Currency impact			(0.4)
Fair value of plan assets, end of period			$	29.3
Change in Benefit Obligation:
Projected benefit obligation, beginning of period			$	46.8
Service cost			1.9
Interest Cost			0.1
Employee contributions			0.9
Actuarial gain			(10.0)
Net benefits received			3.4
Settlements			(5.0)
Currency impact			(0.9)
Projected benefit obligation, end of period			$	37.2
Funded status, end of period			$	(7.9)
Accumulated benefit obligation, end of period			$	34.0

Components of Net Periodic Pension Cost

Components of net periodic pension cost incurred during the years ended December 31, 2023, 2022 and 2021 are as follows:

			Year Ended December 31,
			2023 (1)						2022						2021
Service cost			$	0.7					$	1.9					$	2.4
Interest cost			0.3						0.1						—
Expected return on plan assets			(0.4)						(0.8)						(0.8)
Amortization of loss			—						0.1						0.6
Amortization of prior service credit			—						(0.1)						(0.2)
Settlements			—						(0.4)						—
Net periodic benefit cost			$	0.6					$	0.8					$	2.0
(1) The Swiss Plan was sold as part of our travel health business to Bavarian Nordic, as described further in Note 3, "Divestiture".

Schedule of Weighted Average Assumptions

The weighted average assumptions used to calculate the projected benefit obligations were as follows:

									December 31, 2022
Discount rate									2.1		%
Expected rate of return									3.5		%
Rate of future compensation increases									1.8		%

Schedule of Accumulated Other Comprehensive Loss Before Income Tax

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:

									December 31, 2022
Net actuarial gain									$	9.0
Prior service cost									(0.3)
Total recognized in other comprehensive income (loss)									$	8.7

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Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans.

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